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1. TOI-2374 b and TOI-3071 b: two metal-rich sub-Saturns well within the Neptunian desert

Author

Hacker, Alejandro, Díaz, Rodrigo F., Armstrong, David J., Fernández, Jorge Fernández, Müller, Simon, Delgado-Mena, Elisa, Sousa, Sérgio G., Adibekyan, Vardan, Stassun, Keivan G., Collins, Karen A., Yee, Samuel W., Bayliss, Daniel, Bieryla, Allyson, Bouchy, François, Butler, R. Paul, Crane, Jeffrey D., Dumusque, Xavier, Hartman, Joel D., Helled, Ravit, Jenkins, Jon, Keniger, Marcelo Aron F., Lewis, Hannah, Lillo-Box, Jorge, Lund, Michael B., Nielsen, Louise D., Osborn, Ares, Osip, David, Paegert, Martin, Radford, Don J., Santos, Nuno C., Seager, Sara, Shectman, Stephen A., Srdoc, Gregor, Strøm, Paul A., Tan, Thiam-Guan, Teske, Johanna K., Vezie, Michael, Watanabe, David, Watkins, Cristilyn N., Wheatley, Peter J., Winn, Joshua N., Wohler, Bill, and Ziegler, Carl

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

We report the discovery of two transiting planets detected by the Transiting Exoplanet Survey Satellite (TESS), TOI-2374 b and TOI-3071 b, orbiting a K5V and an F8V star, respectively, with periods of 4.31 and 1.27 days, respectively. We confirm and characterize these two planets with a variety of ground-based and follow-up observations, including photometry, precise radial velocity monitoring and high-resolution imaging. The planetary and orbital parameters were derived from a joint analysis of the radial velocities and photometric data. We found that the two planets have masses of $(57 \pm 4)$ $M_\oplus$ or $(0.18 \pm 0.01)$ $M_J$, and $(68 \pm 4)$ $M_\oplus$ or $(0.21 \pm 0.01)$ $M_J$, respectively, and they have radii of $(6.8 \pm 0.3)$ $R_\oplus$ or $(0.61 \pm 0.03)$ $R_J$ and $(7.2 \pm 0.5)$ $R_\oplus$ or $(0.64 \pm 0.05)$ $R_J$, respectively. These parameters correspond to sub-Saturns within the Neptunian desert, both planets being hot and highly irradiated, with $T_{\rm eq} \approx 745$ $K$ and $T_{\rm eq} \approx 1812$ $K$, respectively, assuming a Bond albedo of 0.5. TOI-3071 b has the hottest equilibrium temperature of all known planets with masses between $10$ and $300$ $M_\oplus$ and radii less than $1.5$ $R_J$. By applying gas giant evolution models we found that both planets, especially TOI-3071 b, are very metal-rich. This challenges standard formation models which generally predict lower heavy-element masses for planets with similar characteristics. We studied the evolution of the planets' atmospheres under photoevaporation and concluded that both are stable against evaporation due to their large masses and likely high metallicities in their gaseous envelopes., Comment: 24 pages, 22 figures, 10 tables, accepted for publication in MNRAS

Published
2024

2. NIRPS first light and early science: breaking the 1 m/s RV precision barrier at infrared wavelengths

Author

Artigau, Étienne, Bouchy, François, Doyon, René, Baron, Frédérique, Malo, Lison, Wildi, François, Pepe, Franceso, Cook, Neil J., Thibault, Simon, Reshetov, Vladimir, Dumusque, Xavier, Lovis, Christophe, Sosnowska, Danuta, Martins, Bruno L. Canto, De Medeiros, Jose Renan, Delfosse, Xavier, Santos, Nuno, Rebolo, Rafael, Abreu, Manuel, Allain, Guillaume, Allart, Romain, Auger, Hugues, Barros, Susana, Bazinet, Luc, Blind, Nicolas, Boisse, Isabelle, Bonfils, Xavier, Bourrier, Vincent, Bovay, Sébastien, Broeg, Christopher, Brousseau, Denis, Bruniquel, Vincent, Cabral, Alexandre, Cadieux, Charles, Carmona, Andres, Carteret, Yann, Challita, Zalpha, Chazelas, Bruno, Cloutier, Ryan, Coelho, João, Cointepas, Marion, Conod, Uriel, Cowan, Nicolas, Cristo, Eduardo, da Silva, João Gomes, Dauplaise, Laurie, Gomes, Roseane de Lima, Delgado-Mena, Elisa, Ehrenreich, David, Faria, João, Figueira, Pedro, Forveille, Thierry, Frensch, Yolanda, Gagné, Jonathan, Genest, Frédéric, Genolet, Ludovic, Hernández, Jonay I. González, Témich, Félix Gracia, Grieves, Nolan, Hernandez, Olivier, Hobson, Melissa J., Hoeijmakers, Jens, Kerley, Dan, Krishnamurthy, Vigneshwaran, Lafrenière, David, Lamontagne, Pierrot, Larue, Pierre, Leaf, Henry, Leão, Izan C., Lim, Olivia, Curto, Gaspare Lo, Martins, Allan M., Melo, Claudio, Messias, Yuri S., Mignon, Lucile, Moranta, Leslie, Mordasini, Christoph, Moulla, Khaled Al, Mounzer, Dany, L'Heureux, Alexandrine, Nari, Nicola, Nielsen, Louise, Osborn, Ares, Parc, Léna, Pasquini, Luca, Passegger, Vera M., Pelletier, Stefan, Peroux, Céline, Piaulet, Caroline, Plotnykov, Mykhaylo, Poulin-Girard, Anne-Sophie, Rasilla, José Luis, Saint-Antoine, Jonathan, Sarajlic, Mirsad, Segovia, Alex, Seidel, Julia, Ségransan, Damien, Silva, Ana Rita Costa, Srivastava, Avidaan, Stefanov, Atanas K., Mascareño, Alejandro Suárez, Sordet, Michael, Teixeira, Márcio A., Udry, Stéphane, Valencia, Diana, Vallée, Philippe, Vandal, Thomas, Vaulato, Valentina, Wade, Gregg, Wardenier, Joost P., Wehbé, Bachar, Weisserman, Drew, Wevers, Ivan, and Zins, Gérard

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract

The Near-InfraRed Planet Searcher or NIRPS is a precision radial velocity spectrograph developed through collaborative efforts among laboratories in Switzerland, Canada, Brazil, France, Portugal and Spain. NIRPS extends to the 0.98-1.8 $\mu$m domain of the pioneering HARPS instrument at the La Silla 3.6-m telescope in Chile and it has achieved unparalleled precision, measuring stellar radial velocities in the infrared with accuracy better than 1 m/s. NIRPS can be used either stand-alone or simultaneously with HARPS. Commissioned in late 2022 and early 2023, NIRPS embarked on a 5-year Guaranteed Time Observation (GTO) program in April 2023, spanning 720 observing nights. This program focuses on planetary systems around M dwarfs, encompassing both the immediate solar vicinity and transit follow-ups, alongside transit and emission spectroscopy observations. We highlight NIRPS's current performances and the insights gained during its deployment at the telescope. The lessons learned and successes achieved contribute to the ongoing advancement of precision radial velocity measurements and high spectral fidelity, further solidifying NIRPS' role in the forefront of the field of exoplanets., Comment: Proceeding at the SPIE Astronomical Telescopes + Instrumentation conference [Yokohama,Japan; June 2024]

Published
2024

3. The PLATO Mission

Author

Rauer, Heike, Aerts, Conny, Cabrera, Juan, Deleuil, Magali, Erikson, Anders, Gizon, Laurent, Goupil, Mariejo, Heras, Ana, Lorenzo-Alvarez, Jose, Marliani, Filippo, Martin-Garcia, Cesar, Mas-Hesse, J. Miguel, O'Rourke, Laurence, Osborn, Hugh, Pagano, Isabella, Piotto, Giampaolo, Pollacco, Don, Ragazzoni, Roberto, Ramsay, Gavin, Udry, Stéphane, Appourchaux, Thierry, Benz, Willy, Brandeker, Alexis, Güdel, Manuel, Janot-Pacheco, Eduardo, Kabath, Petr, Kjeldsen, Hans, Min, Michiel, Santos, Nuno, Smith, Alan, Suarez, Juan-Carlos, Werner, Stephanie C., Aboudan, Alessio, Abreu, Manuel, Acuña, Lorena, Adams, Moritz, Adibekyan, Vardan, Affer, Laura, Agneray, François, Agnor, Craig, Børsen-Koch, Victor Aguirre, Ahmed, Saad, Aigrain, Suzanne, Al-Bahlawan, Ashraf, Gil, M de los Angeles Alcacera, Alei, Eleonora, Alencar, Silvia, Alexander, Richard, Alfonso-Garzón, Julia, Alibert, Yann, Prieto, Carlos Allende, Almeida, Leonardo, Sobrino, Roi Alonso, Altavilla, Giuseppe, Althaus, Christian, Trujillo, Luis Alonso Alvarez, Amarsi, Anish, Eiff, Matthias Ammler-von, Amôres, Eduardo, Andrade, Laerte, Antoniadis-Karnavas, Alexandros, António, Carlos, del Moral, Beatriz Aparicio, Appolloni, Matteo, Arena, Claudio, Armstrong, David, Aliaga, Jose Aroca, Asplund, Martin, Audenaert, Jeroen, Auricchio, Natalia, Avelino, Pedro, Baeke, Ann, Baillié, Kevin, Balado, Ana, Balestra, Andrea, Ball, Warrick, Ballans, Herve, Ballot, Jerome, Barban, Caroline, Barbary, Gaële, Barbieri, Mauro, Forteza, Sebastià Barceló, Barker, Adrian, Barklem, Paul, Barnes, Sydney, Navascues, David Barrado, Barragan, Oscar, Baruteau, Clément, Basu, Sarbani, Baudin, Frederic, Baumeister, Philipp, Bayliss, Daniel, Bazot, Michael, Beck, Paul G., Bedding, Tim, Belkacem, Kevin, Bellinger, Earl, Benatti, Serena, Benomar, Othman, Bérard, Diane, Bergemann, Maria, Bergomi, Maria, Bernardo, Pierre, Biazzo, Katia, Bignamini, Andrea, Bigot, Lionel, Billot, Nicolas, Binet, Martin, Biondi, David, Biondi, Federico, Birch, Aaron C., Bitsch, Bertram, Ceballos, Paz Victoria Bluhm, Bódi, Attila, Bognár, Zsófia, Boisse, Isabelle, Bolmont, Emeline, Bonanno, Alfio, Bonavita, Mariangela, Bonfanti, Andrea, Bonfils, Xavier, Bonito, Rosaria, Bonomo, Aldo Stefano, Börner, Anko, Saikia, Sudeshna Boro, Martín, Elisa Borreguero, Borsa, Francesco, Borsato, Luca, Bossini, Diego, Bouchy, Francois, Boué, Gwenaël, Boufleur, Rodrigo, Boumier, Patrick, Bourrier, Vincent, Bowman, Dominic M., Bozzo, Enrico, Bradley, Louisa, Bray, John, Bressan, Alessandro, Breton, Sylvain, Brienza, Daniele, Brito, Ana, Brogi, Matteo, Brown, Beverly, Brown, David, Brun, Allan Sacha, Bruno, Giovanni, Bruns, Michael, Buchhave, Lars A., Bugnet, Lisa, Buldgen, Gaël, Burgess, Patrick, Busatta, Andrea, Busso, Giorgia, Buzasi, Derek, Caballero, José A., Cabral, Alexandre, Calderone, Flavia, Cameron, Robert, Cameron, Andrew, Campante, Tiago, Martins, Bruno Leonardo Canto, Cara, Christophe, Carone, Ludmila, Carrasco, Josep Manel, Casagrande, Luca, Casewell, Sarah L., Cassisi, Santi, Castellani, Marco, Castro, Matthieu, Catala, Claude, Fernández, Irene Catalán, Catelan, Márcio, Cegla, Heather, Cerruti, Chiara, Cessa, Virginie, Chadid, Merieme, Chaplin, William, Charpinet, Stephane, Chiappini, Cristina, Chiarucci, Simone, Chiavassa, Andrea, Chinellato, Simonetta, Chirulli, Giovanni, Christensen-Dalsgaard, Jorgen, Church, Ross, Claret, Antonio, Clarke, Cathie, Claudi, Riccardo, Clermont, Lionel, Coelho, Hugo, Coelho, Joao, Cogato, Fabrizio, Colomé, Josep, Condamin, Mathieu, Conseil, Simon, Corbard, Thierry, Correia, Alexandre C. M., Corsaro, Enrico, Cosentino, Rosario, Costes, Jean, Cottinelli, Andrea, Covone, Giovanni, Creevey, Orlagh L., Crida, Aurelien, Csizmadia, Szilard, Cunha, Margarida, Curry, Patrick, da Costa, Jefferson, da Silva, Francys, Dalal, Shweta, Damasso, Mario, Damiani, Cilia, Damiani, Francesco, Chagas, Maria Liduina das, Davies, Melvyn, Davies, Guy, Davies, Ben, Davison, Gary, de Almeida, Leandro, de Angeli, Francesca, de Barros, Susana Cristina Cabral, Leão, Izan de Castro, de Freitas, Daniel Brito, de Freitas, Marcia Cristina, De Martino, Domitilla, de Medeiros, José Renan, de Paula, Luiz Alberto, de Plaa, Jelle, De Ridder, Joris, Deal, Morgan, Decin, Leen, Deeg, Hans, Degl'Innocenti, Scilla, Deheuvels, Sebastien, del Burgo, Carlos, Del Sordo, Fabio, Delgado-Mena, Elisa, Demangeon, Olivier, Denk, Tilmann, Derekas, Aliz, Desidera, Silvano, Dexet, Marc, Di Criscienzo, Marcella, Di Giorgio, Anna Maria, Di Mauro, Maria Pia, Rial, Federico Jose Diaz, Díaz-García, José-Javier, Dima, Marco, Dinuzzi, Giacomo, Dionatos, Odysseas, Distefano, Elisa, Nascimento Jr., Jose-Dias do, Domingo, Albert, D'Orazi, Valentina, Dorn, Caroline, Doyle, Lauren, Duarte, Elena, Ducellier, Florent, Dumaye, Luc, Dumusque, Xavier, Dupret, Marc-Antoine, Eggenberger, Patrick, Ehrenreich, David, Eigmüller, Philipp, Eising, Johannes, Emilio, Marcelo, Eriksson, Kjell, Ermocida, Marco, Giribaldi, Riano Isidoro Escate, Eschen, Yoshi, Estrela, Inês, Evans, Dafydd Wyn, Fabbian, Damian, Fabrizio, Michele, Faria, João Pedro, Farina, Maria, Farinato, Jacopo, Feliz, Dax, Feltzing, Sofia, Fenouillet, Thomas, Ferrari, Lorenza, Ferraz-Mello, Sylvio, Fialho, Fabio, Fienga, Agnes, Figueira, Pedro, Fiori, Laura, Flaccomio, Ettore, Focardi, Mauro, Foley, Steve, Fontignie, Jean, Ford, Dominic, Fornazier, Karin, Forveille, Thierry, Fossati, Luca, Franca, Rodrigo de Marca, da Silva, Lucas Franco, Frasca, Antonio, Fridlund, Malcolm, Furlan, Marco, Gabler, Sarah-Maria, Gaido, Marco, Gallagher, Andrew, Galli, Emanuele, Garcia, Rafael A., Hernández, Antonio García, Munoz, Antonio Garcia, García-Vázquez, Hugo, Haba, Rafael Garrido, Gaulme, Patrick, Gauthier, Nicolas, Gehan, Charlotte, Gent, Matthew, Georgieva, Iskra, Ghigo, Mauro, Giana, Edoardo, Gill, Samuel, Girardi, Leo, Winter, Silvia Giuliatti, Giusi, Giovanni, da Silva, João Gomes, Zazo, Luis Jorge Gómez, Gomez-Lopez, Juan Manuel, Hernández, Jonay Isai González, Murillo, Kevin Gonzalez, Gorius, Nicolas, Gouel, Pierre-Vincent, Goulty, Duncan, Granata, Valentina, Grenfell, John Lee, Grießbach, Denis, Grolleau, Emmanuel, Grouffal, Salomé, Grziwa, Sascha, Guarcello, Mario Giuseppe, Gueguen, Loïc, Guenther, Eike Wolf, Guilhem, Terrasa, Guillerot, Lucas, Guiot, Pierre, Guterman, Pascal, Gutiérrez, Antonio, Gutiérrez-Canales, Fernando, Hagelberg, Janis, Haldemann, Jonas, Hall, Cassandra, Handberg, Rasmus, Harrison, Ian, Harrison, Diana L., Hasiba, Johann, Haswell, Carole A., Hatalova, Petra, Hatzes, Artie, Haywood, Raphaelle, Hébrard, Guillaume, Heckes, Frank, Heiter, Ulrike, Hekker, Saskia, Heller, René, Helling, Christiane, Helminiak, Krzysztof, Hemsley, Simon, Heng, Kevin, Hermans, Aline, Hermes, JJ, Torres, Nadia Hidalgo, Hinkel, Natalie, Hobbs, David, Hodgkin, Simon, Hofmann, Karl, Hojjatpanah, Saeed, Houdek, Günter, Huber, Daniel, Huesler, Joseph, Hui-Bon-Hoa, Alain, Huygen, Rik, Huynh, Duc-Dat, Iro, Nicolas, Irwin, Jonathan, Irwin, Mike, Izidoro, André, Jacquinod, Sophie, Jannsen, Nicholas Emborg, Janson, Markus, Jeszenszky, Harald, Jiang, Chen, Mancebo, Antonio José Jimenez, Jofre, Paula, Johansen, Anders, Johnston, Cole, Jones, Geraint, Kallinger, Thomas, Kálmán, Szilárd, Kanitz, Thomas, Karjalainen, Marie, Karjalainen, Raine, Karoff, Christoffer, Kawaler, Steven, Kawata, Daisuke, Keereman, Arnoud, Keiderling, David, Kennedy, Tom, Kenworthy, Matthew, Kerschbaum, Franz, Kidger, Mark, Kiefer, Flavien, Kintziger, Christian, Kislyakova, Kristina, Kiss, László, Klagyivik, Peter, Klahr, Hubert, Klevas, Jonas, Kochukhov, Oleg, Köhler, Ulrich, Kolb, Ulrich, Koncz, Alexander, Korth, Judith, Kostogryz, Nadiia, Kovács, Gábor, Kovács, József, Kozhura, Oleg, Krivova, Natalie, Kučinskas, Arunas, Kuhlemann, Ilyas, Kupka, Friedrich, Laauwen, Wouter, Labiano, Alvaro, Lagarde, Nadege, Laget, Philippe, Laky, Gunter, Lam, Kristine Wai Fun, Lambrechts, Michiel, Lammer, Helmut, Lanza, Antonino Francesco, Lanzafame, Alessandro, Martiz, Mariel Lares, Laskar, Jacques, Latter, Henrik, Lavanant, Tony, Lawrenson, Alastair, Lazzoni, Cecilia, Lebre, Agnes, Lebreton, Yveline, Etangs, Alain Lecavelier des, Leinhardt, Zoe, Leleu, Adrien, Lendl, Monika, Leto, Giuseppe, Levillain, Yves, Libert, Anne-Sophie, Lichtenberg, Tim, Ligi, Roxanne, Lignieres, Francois, Lillo-Box, Jorge, Linsky, Jeffrey, Liu, John Scige, Loidolt, Dominik, Longval, Yuying, Lopes, Ilídio, Lorenzani, Andrea, Ludwig, Hans-Guenter, Lund, Mikkel, Lundkvist, Mia Sloth, Luri, Xavier, Maceroni, Carla, Madden, Sean, Madhusudhan, Nikku, Maggio, Antonio, Magliano, Christian, Magrin, Demetrio, Mahy, Laurent, Maibaum, Olaf, Malac-Allain, LeeRoy, Malapert, Jean-Christophe, Malavolta, Luca, Maldonado, Jesus, Mamonova, Elena, Manchon, Louis, Mann, Andrew, Mantovan, Giacomo, Marafatto, Luca, Marconi, Marcella, Mardling, Rosemary, Marigo, Paola, Marinoni, Silvia, Marques, Érico, Marques, Joao Pedro, Marrese, Paola Maria, Marshall, Douglas, Perales, Silvia Martínez, Mary, David, Marzari, Francesco, Masana, Eduard, Mascher, Andrina, Mathis, Stéphane, Mathur, Savita, Figueiredo, Ana Carolina Mattiuci, Maxted, Pierre F. L., Mazeh, Tsevi, Mazevet, Stephane, Mazzei, Francesco, McCormac, James, McMillan, Paul, Menou, Lucas, Merle, Thibault, Meru, Farzana, Mesa, Dino, Messina, Sergio, Mészáros, Szabolcs, Meunier, Nadége, Meunier, Jean-Charles, Micela, Giuseppina, Michaelis, Harald, Michel, Eric, Michielsen, Mathias, Michtchenko, Tatiana, Miglio, Andrea, Miguel, Yamila, Milligan, David, Mirouh, Giovanni, Mitchell, Morgan, Moedas, Nuno, Molendini, Francesca, Molnár, László, Mombarg, Joey, Montalban, Josefina, Montalto, Marco, Monteiro, Mário J. P. F. G., Morales, Juan Carlos, Morales-Calderon, Maria, Morbidelli, Alessandro, Mordasini, Christoph, Moreau, Chrystel, Morel, Thierry, Morello, Guiseppe, Morin, Julien, Mortier, Annelies, Mosser, Benoît, Mourard, Denis, Mousis, Olivier, Moutou, Claire, Mowlavi, Nami, Moya, Andrés, Muehlmann, Prisca, Muirhead, Philip, Munari, Matteo, Musella, Ilaria, Mustill, Alexander James, Nardetto, Nicolas, Nardiello, Domenico, Narita, Norio, Nascimbeni, Valerio, Nash, Anna, Neiner, Coralie, Nelson, Richard P., Nettelmann, Nadine, Nicolini, Gianalfredo, Nielsen, Martin, Niemi, Sami-Matias, Noack, Lena, Noels-Grotsch, Arlette, Noll, Anthony, Norazman, Azib, Norton, Andrew J., Nsamba, Benard, Ofir, Aviv, Ogilvie, Gordon, Olander, Terese, Olivetto, Christian, Olofsson, Göran, Ong, Joel, Ortolani, Sergio, Oshagh, Mahmoudreza, Ottacher, Harald, Ottensamer, Roland, Ouazzani, Rhita-Maria, Paardekooper, Sijme-Jan, Pace, Emanuele, Pajas, Miriam, Palacios, Ana, Palandri, Gaelle, Palle, Enric, Paproth, Carsten, Parro, Vanderlei, Parviainen, Hannu, Granado, Javier Pascual, Passegger, Vera Maria, Pastor-Morales, Carmen, Pätzold, Martin, Pedersen, May Gade, Hidalgo, David Pena, Pepe, Francesco, Pereira, Filipe, Persson, Carina M., Pertenais, Martin, Peter, Gisbert, Petit, Antoine C., Petit, Pascal, Pezzuto, Stefano, Pichierri, Gabriele, Pietrinferni, Adriano, Pinheiro, Fernando, Pinsonneault, Marc, Plachy, Emese, Plasson, Philippe, Plez, Bertrand, Poppenhaeger, Katja, Poretti, Ennio, Portaluri, Elisa, Portell, Jordi, de Mello, Gustavo Frederico Porto, Poyatos, Julien, Pozuelos, Francisco J., Moroni, Pier Giorgio Prada, Pricopi, Dumitru, Prisinzano, Loredana, Quade, Matthias, Quirrenbach160, ndreas, Reina6, Julio Arturo Rabanal, Soares, Maria Cristina Rabello, Raimondo, Gabriella, Rainer, Monica, Rodón, Jose Ramón, Ramón-Ballesta, Alejandro, Zapata, Gonzalo Ramos, Rätz, Stefanie, Rauterberg, Christoph, Redman, Bob, Redmer, Ronald, Reese, Daniel, Regibo, Sara, Reiners, Ansgar, Reinhold, Timo, Renie, Christian, Ribas, Ignasi, Ribeiro, Sergio, Ricciardi, Thiago Pereira, Rice, Ken, Richard, Olivier, Riello, Marco, Rieutord, Michel, Ripepi, Vincenzo, Rixon, Guy, Rockstein, Steve, Rodríguez, María Teresa Rodrigo, Díaz, Luisa Fernanda Rodríguez, Garcia, Juan Pablo Rodriguez, Rodriguez-Gomez, Julio, Roehlly, Yannick, Roig, Fernando, Rojas-Ayala, Bárbara, Rolf, Tobias, Rørsted, Jakob Lysgaard, Rosado, Hugo, Rosotti, Giovanni, Roth, Olivier, Roth, Markus, Rousseau, Alex, Roxburgh, Ian, Roy, Fabrice, Royer, Pierre, Ruane, Kirk, Mastropasqua, Sergio Rufini, de Galarreta, Claudia Ruiz, Russi, Andrea, Saar, Steven, Saillenfest, Melaine, Salaris, Maurizio, Salmon, Sebastien, Saltas, Ippocratis, Samadi, Réza, Samadi, Aunia, Samra, Dominic, da Silva, Tiago Sanches, Carrasco, Miguel Andrés Sánchez, Santerne, Alexandre, Santoli, Francesco, Santos, Ângela R. G., Mesa, Rosario Sanz, Sarro, Luis Manuel, Scandariato, Gaetano, Schäfer, Martin, Schlafly, Edward, Schmider, François-Xavier, Schneider, Jean, Schou, Jesper, Schunker, Hannah, Schwarzkopf, Gabriel Jörg, Serenelli, Aldo, Seynaeve, Dries, Shan, Yutong, Shapiro, Alexander, Shipman, Russel, Sicilia, Daniela, Sanmartin, Maria Angeles Sierra, Sigot, Axelle, Silliman, Kyle, Silvotti, Roberto, Simon, Attila E., Napoli, Ricardo Simoyama, Skarka, Marek, Smalley, Barry, Smiljanic, Rodolfo, Smit, Samuel, Smith, Alexis, Smith, Leigh, Snellen, Ignas, Sódor, Ádám, Sohl, Frank, Solanki, Sami K., Sortino, Francesca, Sousa, Sérgio, Southworth, John, Souto, Diogo, Sozzetti, Alessandro, Stamatellos, Dimitris, Stassun, Keivan, Steller, Manfred, Stello, Dennis, Stelzer, Beate, Stiebeler, Ulrike, Stokholm, Amalie, Storelvmo, Trude, Strassmeier, Klaus, Strøm, Paul Anthony, Strugarek, Antoine, Sulis, Sophia, Švanda, Michal, Szabados, László, Szabó, Róbert, Szabó, Gyula M., Szuszkiewicz, Ewa, Talens, Geert Jan, Teti, Daniele, Theisen, Tom, Thévenin, Frédéric, Thoul, Anne, Tiphene, Didier, Titz-Weider, Ruth, Tkachenko, Andrew, Tomecki, Daniel, Tonfat, Jorge, Tosi, Nicola, Trampedach, Regner, Traven, Gregor, Triaud, Amaury, Trønnes, Reidar, Tsantaki, Maria, Tschentscher, Matthias, Turin, Arnaud, Tvaruzka, Adam, Ulmer, Bernd, Ulmer-Moll, Solène, Ulusoy, Ceren, Umbriaco, Gabriele, Valencia, Diana, Valentini, Marica, Valio, Adriana, Guijarro, Ángel Luis Valverde, Van Eylen, Vincent, Van Grootel, Valerie, van Kempen, Tim A., Van Reeth, Timothy, Van Zelst, Iris, Vandenbussche, Bart, Vasiliou, Konstantinos, Vasilyev, Valeriy, de Mascarenhas, David Vaz, Vazan, Allona, Nunez, Marina Vela, Velloso, Eduardo Nunes, Ventura, Rita, Ventura, Paolo, Venturini, Julia, Trallero, Isabel Vera, Veras, Dimitri, Verdugo, Eva, Verma, Kuldeep, Vibert, Didier, Martinez, Tobias Vicanek, Vida, Krisztián, Vigan, Arthur, Villacorta, Antonio, Villaver, Eva, Aparicio, Marcos Villaverde, Viotto, Valentina, Vorobyov, Eduard, Vorontsov, Sergey, Wagner, Frank W., Walloschek, Thomas, Walton, Nicholas, Walton, Dave, Wang, Haiyang, Waters, Rens, Watson, Christopher, Wedemeyer, Sven, Weeks, Angharad, Weingril, Jörg, Weiss, Annita, Wendler, Belinda, West, Richard, Westerdorff, Karsten, Westphal, Pierre-Amaury, Wheatley, Peter, White, Tim, Whittaker, Amadou, Wickhusen, Kai, Wilson, Thomas, Windsor, James, Winter, Othon, Winther, Mark Lykke, Winton, Alistair, Witteck, Ulrike, Witzke, Veronika, Woitke, Peter, Wolter, David, Wuchterl, Günther, Wyatt, Mark, Yang, Dan, Yu, Jie, Sanchez, Ricardo Zanmar, Osorio, María Rosa Zapatero, Zechmeister, Mathias, Zhou, Yixiao, Ziemke, Claas, and Zwintz, Konstanze

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract

PLATO (PLAnetary Transits and Oscillations of stars) is ESA's M3 mission designed to detect and characterise extrasolar planets and perform asteroseismic monitoring of a large number of stars. PLATO will detect small planets (down to <2 R_(Earth)) around bright stars (<11 mag), including terrestrial planets in the habitable zone of solar-like stars. With the complement of radial velocity observations from the ground, planets will be characterised for their radius, mass, and age with high accuracy (5 %, 10 %, 10 % for an Earth-Sun combination respectively). PLATO will provide us with a large-scale catalogue of well-characterised small planets up to intermediate orbital periods, relevant for a meaningful comparison to planet formation theories and to better understand planet evolution. It will make possible comparative exoplanetology to place our Solar System planets in a broader context. In parallel, PLATO will study (host) stars using asteroseismology, allowing us to determine the stellar properties with high accuracy, substantially enhancing our knowledge of stellar structure and evolution. The payload instrument consists of 26 cameras with 12cm aperture each. For at least four years, the mission will perform high-precision photometric measurements. Here we review the science objectives, present PLATO's target samples and fields, provide an overview of expected core science performance as well as a description of the instrument and the mission profile at the beginning of the serial production of the flight cameras. PLATO is scheduled for a launch date end 2026. This overview therefore provides a summary of the mission to the community in preparation of the upcoming operational phases.

Published
2024

4. Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815

Author

Psaridi, Angelica, Osborn, Hugh, Bouchy, François, Lendl, Monika, Parc, Léna, Billot, Nicolas, Broeg, Christopher, Sousa, Sérgio G., Adibekyan, Vardan, Attia, Omar, Bonfanti, Andrea, Chakraborty, Hritam, Collins, Karen A., Davoult, Jeanne, Delgado-Mena, Elisa, Grieves, Nolan, Guillot, Tristan, Heitzmann, Alexis, Helled, Ravit, Hellier, Coel, Jenkins, Jon M., Knierim, Henrik, Krenn, Andreas, Lissauer, JackJ., Luque, Rafael, Rapetti, David, Santos, Nuno C., Suárez, Olga, Venturini, Julia, Wilkin, Francis P., Wilson, Thomas G., Winn, Joshua N., Ziegler, Carl, Zingales, Tiziano, Alibert, Yann, Brandeker, Alexis, Egger, Jo Ann, Gandolfi, Davide, Hooton, Matthew J., Tuson, Amy, Ulmer-Moll, Solène, Abe, Lyu, Allart, Romain, Alonso, Roi, Anderson, David R., Anglada, Guillem, Bárczy, Tamas, Barrado, David, Barros, Susana C. C., Baumjohann, Wolfgang, Beck, Mathias, Beck, Thomas, Benz, Willy, Bonfils, Xavier, Borsato, Luca, Bourrier, Vincent, Ciardi, David R., Cameron, Andrew Collier, Charnoz, Sébastien, Cointepas, Marion, Csizmadia, Szilárd, Cubillos, Patricio, Curto, Gaspare Lo, Davies, Melvyn B., Daylan, Tansu, Deleuil, Magali, Deline, Adrien, Delrez, Laetitia, Demangeon, Olivier D. S., Demory, Brice-Olivier, Dorn, Caroline, Dumusque, Xavier, Ehrenreich, David, Erikson, Anders, Etangs, Alain Lecavelier des, Ferreras, Elena Diana de Miguel, Fortier, Andrea, Fossati, Luca, Frensch, Yolanda G. C., Fridlund, Malcolm, Gillon, Michaël, Güdel, Manuel, Günther, Maximilian N., Hagelberg, Janis, Helling, Christiane, Hoyer, Sergio, Isaak, Kate G., Kiss, Laszlo L., Lam, Kristine, Laskar, Jacques, Lavie, Baptiste, Lovis, Christophe, Magrin, Demetrio, Marafatto, Luca, Maxted, Pierre, McDermott, Scott, Mékarnia, Djamel, Mordasini, Christoph, Murgas, Felipe, Nascimbeni, Valerio, Nielsen, Louise D., Olofsson, Göran, Ottensamer, Roland, Pagano, Isabella, Pallé, Enric, Peter, Gisbert, Piotto, Giampaolo, Pollacco, Don, Queloz, Didier, Ragazzoni, Roberto, Ramos, Devin, Rando, Nicola, Rauer, Heike, Reimers, Christian, Ribas, Ignasi, Seager, Sara, Ségransan, Damien, Scandariato, Gaetano, Simon, Attila, Smith, Alexis M. S., Stalport, Manu, Steller, Manfred, Szabó, Gyula, Thomas, Nicolas, Pritchard, Tyler A., Udry, Stéphane, Van Damme, Carlos Corral, Van Grootel, Valérie, Villaver, Eva, Walter, Ingo, Walton, Nicholas, Watkins, Cristilyn N., and West, Richard G.

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

We present the discovery and characterization of two warm mini-Neptunes transiting the K3V star TOI-815 in a K-M binary system. Analysis of the spectra and rotation period reveal it to be a young star with an age of $200^{+400}_{-200}$Myr. TOI-815b has a 11.2-day period and a radius of 2.94$\pm$0.05$\it{R_{\rm\mathrm{\oplus}}}$ with transits observed by TESS, CHEOPS, ASTEP, and LCOGT. The outer planet, TOI-815c, has a radius of 2.62$\pm$0.10$\it{R_{\rm\mathrm{\oplus}}}$, based on observations of three non-consecutive transits with TESS, while targeted CHEOPS photometry and radial velocity follow-up with ESPRESSO were required to confirm the 35-day period. ESPRESSO confirmed the planetary nature of both planets and measured masses of 7.6$\pm$1.5 $\it{M_{\rm \mathrm{\oplus}}}$ ($\rho_\mathrm{P}$=1.64$^{+0.33}_{-0.31}$gcm$^{-3}$) and 23.5$\pm$2.4$\it{M_{\rm\mathrm{\oplus}}}$ ($\rho_\mathrm{P}$=7.2$^{+1.1}_{-1.0}$gcm$^{-3}$) respectively. Thus, the planets have very different masses, unlike the usual similarity of masses in compact multi-planet systems. Moreover, our statistical analysis of mini-Neptunes orbiting FGK stars suggests that weakly irradiated planets tend to have higher bulk densities compared to those suffering strong irradiation. This could be ascribed to their cooler atmospheres, which are more compressed and denser. Internal structure modeling of TOI-815b suggests it likely has a H-He atmosphere constituting a few percent of the total planet mass, or higher if the planet is assumed to have no water. In contrast, the measured mass and radius of TOI-815c can be explained without invoking any atmosphere, challenging planetary formation theories. Finally, we infer from our measurements that the star is viewed close to pole-on, which implies a spin-orbit misalignment at the 3$\sigma$ level., Comment: 24 pages, 27 figures, 6 tables

Published
2024

5. New Mass and Radius Constraints on the LHS 1140 Planets -- LHS 1140 b is Either a Temperate Mini-Neptune or a Water World

Author

Cadieux, Charles, Plotnykov, Mykhaylo, Doyon, René, Valencia, Diana, Jahandar, Farbod, Dang, Lisa, Turbet, Martin, Fauchez, Thomas J., Cloutier, Ryan, Cherubim, Collin, Artigau, Étienne, Cook, Neil J., Edwards, Billy, Hallatt, Tim, Charnay, Benjamin, Bouchy, François, Allart, Romain, Mignon, Lucile, Baron, Frédérique, Barros, Susana C. C., Benneke, Björn, Martins, B. L. Canto, Cowan, Nicolas B., De Medeiros, J. R., Delfosse, Xavier, Delgado-Mena, Elisa, Dumusque, Xavier, Ehrenreich, David, Hara, Nathan C., Lafrenière, David, Frensch, Yolanda G. C., Hernández, J. I. González, Curto, Gaspare Lo, Malo, Lison, Melo, Claudio, Mounzer, Dany, Passeger, Vera Maria, Pepe, Francesco, Poulin-Girard, Anne-Sophie, Santos, Nuno C., Sosnowska, Danuta, Mascareño, Alejandro Suárez, Thibault, Simon, Vaulato, Valentina, Wade, Gregg A., and Wildi, François

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

The two-planet transiting system LHS 1140 has been extensively observed since its discovery in 2017, notably with $Spitzer$, HST, TESS, and ESPRESSO, placing strong constraints on the parameters of the M4.5 host star and its small temperate exoplanets, LHS 1140 b and c. Here, we reanalyse the ESPRESSO observations of LHS 1140 with the novel line-by-line framework designed to fully exploit the radial velocity content of a stellar spectrum while being resilient to outlier measurements. The improved radial velocities, combined with updated stellar parameters, consolidate our knowledge on the mass of LHS 1140 b (5.60$\pm$0.19 M$_{\oplus}$) and LHS 1140 c (1.91$\pm$0.06 M$_{\oplus}$) with unprecedented precision of 3%. Transits from $Spitzer$, HST, and TESS are jointly analysed for the first time, allowing us to refine the planetary radii of b (1.730$\pm$0.025 R$_{\oplus}$) and c (1.272$\pm$0.026 R$_{\oplus}$). Stellar abundance measurements of refractory elements (Fe, Mg and Si) obtained with NIRPS are used to constrain the internal structure of LHS 1140 b. This planet is unlikely to be a rocky super-Earth as previously reported, but rather a mini-Neptune with a $\sim$0.1% H/He envelope by mass or a water world with a water-mass fraction between 9 and 19% depending on the atmospheric composition and relative abundance of Fe and Mg. While the mini-Neptune case would not be habitable, a water-abundant LHS 1140 b potentially has habitable surface conditions according to 3D global climate models, suggesting liquid water at the substellar point for atmospheres with relatively low CO$_2$ concentration, from Earth-like to a few bars., Comment: 31 pages, 18 figures, accepted for publication in ApJL

Published
2023

6. TOI-332 b: a super dense Neptune found deep within the Neptunian desert

Author

Osborn, Ares, Armstrong, David J., Fernández, Jorge Fernández, Knierim, Henrik, Adibekyan, Vardan, Collins, Karen A., Delgado-Mena, Elisa, Fridlund, Malcolm, da Silva, João Gomes, Hellier, Coel, Jackson, David G., King, George W., Lillo-Box, Jorge, Matson, Rachel A., Matthews, Elisabeth C., Santos, Nuno C., Sousa, Sérgio G., Stassun, Keivan G., Tan, Thiam-Guan, Ricker, George R., Vanderspek, Roland, Latham, David W., Seager, Sara, Winn, Joshua N., Jenkins, Jon M., Bayliss, Daniel, Bouma, Luke G., Ciardi, David R., Collins, Kevin I., Colón, Knicole D., Crossfield, Ian J. M., Demangeon, Olivier D. S., Díaz, Rodrigo F., Dorn, Caroline, Dumusque, Xavier, Keniger, Marcelo Aron Fetzner, Figueira, Pedro, Gan, Tianjun, Goeke, Robert F., Hadjigeorghiou, Andreas, Hawthorn, Faith, Helled, Ravit, Howell, Steve B., Nielsen, Louise D., Osborn, Hugh P., Quinn, Samuel N., Sefako, Ramotholo, Shporer, Avi, Strøm, Paul A., Twicken, Joseph D., Vanderburg, Andrew, and Wheatley, Peter J.

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

To date, thousands of planets have been discovered, but there are regions of the orbital parameter space that are still bare. An example is the short period and intermediate mass/radius space known as the Neptunian desert, where planets should be easy to find but discoveries remain few. This suggests unusual formation and evolution processes are responsible for the planets residing here. We present the discovery of TOI-332 b, a planet with an ultra-short period of $0.78$ d that sits firmly within the desert. It orbits a K0 dwarf with an effective temperature of $5251 \pm 71$ K. TOI-332 b has a radius of $3.20^{+0.16}_{-0.12}$ R$_{\oplus}$, smaller than that of Neptune, but an unusually large mass of $57.2 \pm 1.6$ M$_{\oplus}$. It has one of the highest densities of any Neptune-sized planet discovered thus far at $9.6^{+1.1}_{-1.3}$ gcm$^{-3}$. A 4-layer internal structure model indicates it likely has a negligible hydrogen-helium envelope, something only found for a small handful of planets this massive, and so TOI-332 b presents an interesting challenge to planetary formation theories. We find that photoevaporation cannot account for the mass loss required to strip this planet of the Jupiter-like envelope it would have been expected to accrete. We need to look towards other scenarios, such as high-eccentricity migration, giant impacts, or gap opening in the protoplanetary disc, to try and explain this unusual discovery., Comment: 20 pages, 14 figures, 6 tables, accepted for publication in MNRAS

Published
2023

7. Discovery and characterisation of two Neptune-mass planets orbiting HD 212729 with TESS

Author

Armstrong, David J., Osborn, Ares, Adibekyan, Vardan, Delgado-Mena, Elisa, Hojjatpanah, Saeed, Howell, Steve B., Hoyer, Sergio, Knierim, Henrik, Sousa, Sérgio G., Stassun, Keivan G., Veras, Dimitri, Anderson, David R., Bayliss, Daniel, Bouchy, François, Burke, Christopher J., Christiansen, Jessie L., Dumusque, Xavier, Keniger, Marcelo Aron Fetzner, Hadjigeorghiou, Andreas, Hawthorn, Faith, Helled, Ravit, Jenkins, Jon M., Latham, David W., Lillo-Box, Jorge, Nielsen, Louise D., Osborn, Hugh P., Rodrigues, José, Rodriguez, David, Santos, Nuno C., Seager, Sara, Strøm, Paul A., Torres, Guillermo, Twicken, Joseph D., Udry, Stephane, Wheatley, Peter J., and Winn, Joshua N.

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract

We report the discovery of two exoplanets orbiting around HD 212729 (TOI\,1052, TIC 317060587), a $T_{\rm eff}=6146$K star with V=9.51 observed by TESS in Sectors 1 and 13. One exoplanet, TOI-1052b, is Neptune-mass and transits the star, and an additional planet TOI-1052c is observed in radial velocities but not seen to transit. We confirm the planetary nature of TOI-1052b using precise radial velocity observations from HARPS and determined its parameters in a joint RV and photometry analysis. TOI-1052b has a radius of $2.87^{+0.29}_{-0.24}$ R$_{\oplus}$, a mass of $16.9\pm 1.7$ M$_{\oplus}$, and an orbital period of 9.14 days. TOI-1052c does not show any transits in the TESS data, and has a minimum mass of $34.3^{+4.1}_{-3.7}$ M$_{\oplus}$ and an orbital period of 35.8 days, placing it just interior to the 4:1 mean motion resonance. Both planets are best fit by relatively high but only marginally significant eccentricities of $0.18^{+0.09}_{-0.07}$ for planet b and $0.24^{+0.09}_{-0.08}$ for planet c. We perform a dynamical analysis and internal structure model of the planets as well as deriving stellar parameters and chemical abundances. The mean density of TOI-1052b is $3.9^{+1.7}_{-1.3}$ g cm$^{-3}$ consistent with an internal structure similar to Neptune. A nearby star is observed in Gaia DR3 with the same distance and proper motion as TOI-1052, at a sky projected separation of ~1500AU, making this a potential wide binary star system., Comment: Accepted to MNRAS. 11 pages

Published
2023
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8. TESS spots a mini-neptune interior to a hot saturn in the TOI-2000 system

Author

Sha, Lizhou, Vanderburg, Andrew M., Huang, Chelsea X., Armstrong, David J., Brahm, Rafael, Giacalone, Steven, Wood, Mackenna L., Collins, Karen A., Nielsen, Louise D., Hobson, Melissa J., Ziegler, Carl, Howell, Steve B., Torres-Miranda, Pascal, Mann, Andrew W., Zhou, George, Delgado-Mena, Elisa, Rojas, Felipe I., Abe, Lyu, Trifonov, Trifon, Adibekyan, Vardan, Sousa, Sérgio G., Fajardo-Acosta, Sergio B., Guillot, Tristan, Howard, Saburo, Littlefield, Colin, Hawthorn, Faith, Schmider, François-Xavier, Eberhardt, Jan, Tan, Thiam-Guan, Osborn, Ares, Schwarz, Richard P., Strøm, Paul, Jordán, Andrés, Wang, Gavin, Henning, Thomas, Massey, Bob, Law, Nicholas, Stockdale, Chris, Furlan, Elise, Srdoc, Gregor, Wheatley, Peter J., Navascués, David Barrado, Lissauer, Jack J., Stassun, Keivan G., Ricker, George R., Vanderspek, Roland K., Latham, David W., Winn, Joshua N., Seager, Sara, Jenkins, Jon M., Barclay, Thomas, Bouma, Luke G., Christiansen, Jessie L., Guerrero, Natalia, and Rose, Mark E.

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Hot jupiters (P < 10 d, M > 60 $\mathrm{M}_\oplus$) are almost always found alone around their stars, but four out of hundreds known have inner companion planets. These rare companions allow us to constrain the hot jupiter's formation history by ruling out high-eccentricity tidal migration. Less is known about inner companions to hot Saturn-mass planets. We report here the discovery of the TOI-2000 system, which features a hot Saturn-mass planet with a smaller inner companion. The mini-neptune TOI-2000 b ($2.70 \pm 0.15 \,\mathrm{R}_\oplus$, $11.0 \pm 2.4 \,\mathrm{M}_\oplus$) is in a 3.10-day orbit, and the hot saturn TOI-2000 c ($8.14^{+0.31}_{-0.30} \,\mathrm{R}_\oplus$, $81.7^{+4.7}_{-4.6} \,\mathrm{M}_\oplus$) is in a 9.13-day orbit. Both planets transit their host star TOI-2000 (TIC 371188886, V = 10.98, TESS magnitude = 10.36), a metal-rich ([Fe/H] = $0.439^{+0.041}_{-0.043}$) G dwarf 174 pc away. TESS observed the two planets in sectors 9-11 and 36-38, and we followed up with ground-based photometry, spectroscopy, and speckle imaging. Radial velocities from CHIRON, FEROS, and HARPS allowed us to confirm both planets by direct mass measurement. In addition, we demonstrate constraining planetary and stellar parameters with MIST stellar evolutionary tracks through Hamiltonian Monte Carlo under the PyMC framework, achieving higher sampling efficiency and shorter run time compared to traditional Markov chain Monte Carlo. Having the brightest host star in the V band among similar systems, TOI-2000 b and c are superb candidates for atmospheric characterization by the JWST, which can potentially distinguish whether they formed together or TOI-2000 c swept along material during migration to form TOI-2000 b., Comment: v3 adds RV frequency analysis; 25 pages, 11 figures, 14 tables; revision submitted to MNRAS; machine-readable tables available as ancillary files; posterior samples available from Zenodo at https://doi.org/10.5281/zenodo.7683293 and source code at https://doi.org/10.5281/zenodo.7988268

Published
2022
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9. TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf

Author

Hawthorn, Faith, Bayliss, Daniel, Wilson, Thomas G., Bonfanti, Andrea, Adibekyan, Vardan, Alibert, Yann, Sousa, Sérgio G., Collins, Karen A., Bryant, Edward M., Osborn, Ares, Armstrong, David J., Abe, Lyu, Acton, Jack S., Addison, Brett C., Agabi, Karim, Alonso, Roi, Alves, Douglas R., Anglada-Escudé, Guillem, Bárczy, Tamas, Barclay, Thomas, Barrado, David, Barros, Susana C. C., Baumjohann, Wolfgang, Bendjoya, Philippe, Benz, Willy, Bieryla, Allyson, Bonfils, Xavier, Bouchy, François, Brandeker, Alexis, Broeg, Christopher, Brown, David J. A., Burleigh, Matthew R., Buttu, Marco, Cabrera, Juan, Caldwell, Douglas A., Casewell, Sarah L., Charbonneau, David, Charnoz, Sébastian, Cloutier, Ryan, Cameron, Andrew Collier, Collins, Kevin I., Conti, Dennis M., Crouzet, Nicolas, Czismadia, Szilárd, Davies, Melvyn B., Deleuil, Magali, Delgado-Mena, Elisa, Delrez, Laetitia, Demangeon, Olivier D. S., Demory, Brice-Olivier, Dransfield, Georgina, Dumusque, Xavier, Egger, Jo Ann, Ehrenreich, David, Eigmüller, Philipp, Erickson, Anders, Essack, Zahra, Fortier, Andrea, Fossati, Luca, Fridlund, Malcolm, Günther, Maximilian N., Güdel, Manuel, Gandolfi, Davide, Gillard, Harvey, Gillon, Michaël, Gnilka, Crystal, Goad, Michael R., Goeke, Robert F., Guillot, Tristan, Hadjigeorghiou, Andreas, Hellier, Coel, Henderson, Beth A., Heng, Kevin, Hooton, Matthew J., Horne, Keith, Howell, Steve B., Hoyer, Sergio, Irwin, Jonathan M., Jenkins, James S., Jenkins, Jon M., Jensen, Eric L. N., Kane, Stephen R., Kendall, Alicia, Kielkopf, John F., Kiss, Laszlo L., Lacedelli, Gaia, Laskar, Jacques, Latham, David W., Etangs, Alain Lecavalier des, Leleu, Adrien, Lendl, Monika, Lillo-Box, Jorge, Lovis, Christophe, Mékarnia, Djamel, Massey, Bob, Masters, Tamzin, Maxted, Pierre F. L., Nascimbeni, Valerio, Nielsen, Louise D., O'Brien, Sean M., Olofsson, Göran, Osborn, Hugh P., Pagano, Isabella, Pallé, Enric, Persson, Carina M., Piotto, Giampaolo, Plavchan, Peter, Pollacco, Don, Queloz, Didier, Ragazzoni, Roberto, Rauer, Heike, Ribas, Ignasi, Ricker, George, Ségransan, Damien, Salmon, Sébastien, Santerne, Alexandre, Santos, Nuno C., Scandariato, Gaetano, Schmider, François-Xavier, Schwarz, Richard P., Seager, Sara, Shporer, Avi, Simon, Attila E., Smith, Alexis M. S., Srdoc, Gregor, Steller, Manfred, Suarez, Olga, Szabó, Gyula M., Teske, Johanna, Thomas, Nicolas, Tilbrook, Rosanna H., Triaud, Amaury H. M. J., Udry, Stéphane, Van Grootel, Valérie, Walton, Nicholas, Wang, Sharon X., Wheatley, Peter J., Winn, Joshua N., Wittenmyer, Robert A., and Zhang, Hui

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and Sector 38. TOI-836 is a bright ($T = 8.5$ mag), high proper motion ($\sim\,200$ mas yr$^{-1}$), low metallicity ([Fe/H]$\approx\,-0.28$) K-dwarf with a mass of $0.68\pm0.05$ M$_{\odot}$ and a radius of $0.67\pm0.01$ R$_{\odot}$. We obtain photometric follow-up observations with a variety of facilities, and we use these data-sets to determine that the inner planet, TOI-836 b, is a $1.70\pm0.07$ R$_{\oplus}$ super-Earth in a 3.82 day orbit, placing it directly within the so-called 'radius valley'. The outer planet, TOI-836 c, is a $2.59\pm0.09$ R$_{\oplus}$ mini-Neptune in an 8.60 day orbit. Radial velocity measurements reveal that TOI-836 b has a mass of $4.5\pm0.9$ M$_{\oplus}$ , while TOI-836 c has a mass of $9.6\pm2.6$ M$_{\oplus}$. Photometric observations show Transit Timing Variations (TTVs) on the order of 20 minutes for TOI-836 c, although there are no detectable TTVs for TOI-836 b. The TTVs of planet TOI-836 c may be caused by an undetected exterior planet.

Published
2022
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10. Ariel: Enabling planetary science across light-years

Author

Tinetti, Giovanna, Eccleston, Paul, Haswell, Carole, Lagage, Pierre-Olivier, Leconte, Jérémy, Lüftinger, Theresa, Micela, Giusi, Min, Michel, Pilbratt, Göran, Puig, Ludovic, Swain, Mark, Testi, Leonardo, Turrini, Diego, Vandenbussche, Bart, Osorio, Maria Rosa Zapatero, Aret, Anna, Beaulieu, Jean-Philippe, Buchhave, Lars, Ferus, Martin, Griffin, Matt, Guedel, Manuel, Hartogh, Paul, Machado, Pedro, Malaguti, Giuseppe, Pallé, Enric, Rataj, Mirek, Ray, Tom, Ribas, Ignasi, Szabó, Robert, Tan, Jonathan, Werner, Stephanie, Ratti, Francesco, Scharmberg, Carsten, Salvignol, Jean-Christophe, Boudin, Nathalie, Halain, Jean-Philippe, Haag, Martin, Crouzet, Pierre-Elie, Kohley, Ralf, Symonds, Kate, Renk, Florian, Caldwell, Andrew, Abreu, Manuel, Alonso, Gustavo, Amiaux, Jerome, Berthé, Michel, Bishop, Georgia, Bowles, Neil, Carmona, Manuel, Coffey, Deirdre, Colomé, Josep, Crook, Martin, Désjonqueres, Lucile, Díaz, José J., Drummond, Rachel, Focardi, Mauro, Gómez, Jose M., Holmes, Warren, Krijger, Matthijs, Kovacs, Zsolt, Hunt, Tom, Machado, Richardo, Morgante, Gianluca, Ollivier, Marc, Ottensamer, Roland, Pace, Emanuele, Pagano, Teresa, Pascale, Enzo, Pearson, Chris, Pedersen, Søren Møller, Pniel, Moshe, Roose, Stéphane, Savini, Giorgio, Stamper, Richard, Szirovicza, Peter, Szoke, Janos, Tosh, Ian, Vilardell, Francesc, Barstow, Joanna, Borsato, Luca, Casewell, Sarah, Changeat, Quentin, Charnay, Benjamin, Civiš, Svatopluk, Foresto, Vincent Coudé du, Coustenis, Athena, Cowan, Nicolas, Danielski, Camilla, Demangeon, Olivier, Drossart, Pierre, Edwards, Billy N., Gilli, Gabriella, Encrenaz, Therese, Kiss, Csaba, Kokori, Anastasia, Ikoma, Masahiro, Morales, Juan Carlos, Mendonça, João, Moneti, Andrea, Mugnai, Lorenzo, Muñoz, Antonio García, Helled, Ravit, Kama, Mihkel, Miguel, Yamila, Nikolaou, Nikos, Pagano, Isabella, Panic, Olja, Rengel, Miriam, Rickman, Hans, Rocchetto, Marco, Sarkar, Subhajit, Selsis, Franck, Tennyson, Jonathan, Tsiaras, Angelos, Venot, Olivia, Vida, Krisztián, Waldmann, Ingo P., Yurchenko, Sergey, Szabó, Gyula, Zellem, Rob, Al-Refaie, Ahmed, Alvarez, Javier Perez, Anisman, Lara, Arhancet, Axel, Ateca, Jaume, Baeyens, Robin, Barnes, John R., Bell, Taylor, Benatti, Serena, Biazzo, Katia, Błęcka, Maria, Bonomo, Aldo Stefano, Bosch, José, Bossini, Diego, Bourgalais, Jeremy, Brienza, Daniele, Brucalassi, Anna, Bruno, Giovanni, Caines, Hamish, Calcutt, Simon, Campante, Tiago, Canestrari, Rodolfo, Cann, Nick, Casali, Giada, Casas, Albert, Cassone, Giuseppe, Cara, Christophe, Carone, Ludmila, Carrasco, Nathalie, Chioetto, Paolo, Cortecchia, Fausto, Czupalla, Markus, Chubb, Katy L., Ciaravella, Angela, Claret, Antonio, Claudi, Riccardo, Codella, Claudio, Comas, Maya Garcia, Cracchiolo, Gianluca, Cubillos, Patricio, Da Peppo, Vania, Decin, Leen, Dejabrun, Clemence, Delgado-Mena, Elisa, Di Giorgio, Anna, Diolaiti, Emiliano, Dorn, Caroline, Doublier, Vanessa, Doumayrou, Eric, Dransfield, Georgina, Dumaye, Luc, Dunford, Emma, Escobar, Antonio Jimenez, Van Eylen, Vincent, Farina, Maria, Fedele, Davide, Fernández, Alejandro, Fleury, Benjamin, Fonte, Sergio, Fontignie, Jean, Fossati, Luca, Funke, Bernd, Galy, Camille, Garai, Zoltán, García, Andrés, García-Rigo, Alberto, Garufi, Antonio, Sacco, Giuseppe Germano, Giacobbe, Paolo, Gómez, Alejandro, Gonzalez, Arturo, Gonzalez-Galindo, Francisco, Grassi, Davide, Griffith, Caitlin, Guarcello, Mario Giuseppe, Goujon, Audrey, Gressier, Amélie, Grzegorczyk, Aleksandra, Guillot, Tristan, Guilluy, Gloria, Hargrave, Peter, Hellin, Marie-Laure, Herrero, Enrique, Hills, Matt, Horeau, Benoit, Ito, Yuichi, Jessen, Niels Christian, Kabath, Petr, Kálmán, Szilárd, Kawashima, Yui, Kimura, Tadahiro, Knížek, Antonín, Kreidberg, Laura, Kruid, Ronald, Kruijssen, Diederik J. M., Kubelík, Petr, Lara, Luisa, Lebonnois, Sebastien, Lee, David, Lefevre, Maxence, Lichtenberg, Tim, Locci, Daniele, Lombini, Matteo, Lopez, Alejandro Sanchez, Lorenzani, Andrea, MacDonald, Ryan, Magrini, Laura, Maldonado, Jesus, Marcq, Emmanuel, Migliorini, Alessandra, Modirrousta-Galian, Darius, Molaverdikhani, Karan, Molinari, Sergio, Mollière, Paul, Moreau, Vincent, Morello, Giuseppe, Morinaud, Gilles, Morvan, Mario, Moses, Julianne I., Mouzali, Salima, Nakhjiri, Nariman, Naponiello, Luca, Narita, Norio, Nascimbeni, Valerio, Nikolaou, Athanasia, Noce, Vladimiro, Oliva, Fabrizio, Palladino, Pietro, Papageorgiou, Andreas, Parmentier, Vivien, Peres, Giovanni, Pérez, Javier, Perez-Hoyos, Santiago, Perger, Manuel, Pestellini, Cesare Cecchi, Petralia, Antonino, Philippon, Anne, Piccialli, Arianna, Pignatari, Marco, Piotto, Giampaolo, Podio, Linda, Polenta, Gianluca, Preti, Giampaolo, Pribulla, Theodor, Puertas, Manuel Lopez, Rainer, Monica, Reess, Jean-Michel, Rimmer, Paul, Robert, Séverine, Rosich, Albert, Rossi, Loic, Rust, Duncan, Saleh, Ayman, Sanna, Nicoletta, Schisano, Eugenio, Schreiber, Laura, Schwartz, Victor, Scippa, Antonio, Seli, Bálint, Shibata, Sho, Simpson, Caroline, Shorttle, Oliver, Skaf, N., Skup, Konrad, Sobiecki, Mateusz, Sousa, Sergio, Sozzetti, Alessandro, Šponer, Judit, Steiger, Lukas, Tanga, Paolo, Tackley, Paul, Taylor, Jake, Tecza, Matthias, Terenzi, Luca, Tremblin, Pascal, Tozzi, Andrea, Triaud, Amaury, Trompet, Loïc, Tsai, Shang-Min, Tsantaki, Maria, Valencia, Diana, Vandaele, Ann Carine, Van der Swaelmen, Mathieu, Vardan, Adibekyan, Vasisht, Gautam, Vazan, Allona, Del Vecchio, Ciro, Waltham, Dave, Wawer, Piotr, Widemann, Thomas, Wolkenberg, Paulina, Yip, Gordon Hou, Yung, Yuk, Zilinskas, Mantas, Zingales, Tiziano, and Zuppella, Paola

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract

Ariel, the Atmospheric Remote-sensing Infrared Exoplanet Large-survey, was adopted as the fourth medium-class mission in ESA's Cosmic Vision programme to be launched in 2029. During its 4-year mission, Ariel will study what exoplanets are made of, how they formed and how they evolve, by surveying a diverse sample of about 1000 extrasolar planets, simultaneously in visible and infrared wavelengths. It is the first mission dedicated to measuring the chemical composition and thermal structures of hundreds of transiting exoplanets, enabling planetary science far beyond the boundaries of the Solar System. The payload consists of an off-axis Cassegrain telescope (primary mirror 1100 mm x 730 mm ellipse) and two separate instruments (FGS and AIRS) covering simultaneously 0.5-7.8 micron spectral range. The satellite is best placed into an L2 orbit to maximise the thermal stability and the field of regard. The payload module is passively cooled via a series of V-Groove radiators; the detectors for the AIRS are the only items that require active cooling via an active Ne JT cooler. The Ariel payload is developed by a consortium of more than 50 institutes from 16 ESA countries, which include the UK, France, Italy, Belgium, Poland, Spain, Austria, Denmark, Ireland, Portugal, Czech Republic, Hungary, the Netherlands, Sweden, Norway, Estonia, and a NASA contribution., Comment: Ariel Definition Study Report, 147 pages. Reviewed by ESA Science Advisory Structure in November 2020. Original document available at: https://www.cosmos.esa.int/documents/1783156/3267291/Ariel_RedBook_Nov2020.pdf/

Published
2021

13. TOI-2374 b and TOI-3071 b: two metal-rich sub-Saturns well within the Neptunian desert

Author

Hacker, Alejandro, primary, Díaz, Rodrigo F, additional, Armstrong, David J, additional, Fernández, Jorge Fernández, additional, Müller, Simon, additional, Delgado-Mena, Elisa, additional, Sousa, Sérgio G, additional, Adibekyan, Vardan, additional, Stassun, Keivan G, additional, Collins, Karen A, additional, Yee, Samuel W, additional, Bayliss, Daniel, additional, Bieryla, Allyson, additional, Bouchy, François, additional, Butler, R Paul, additional, Crane, Jeffrey D, additional, Dumusque, Xavier, additional, Hartman, Joel D, additional, Helled, Ravit, additional, Jenkins, Jon, additional, Keniger, Marcelo Aron F, additional, Lewis, Hannah, additional, Lillo-Box, Jorge, additional, Lund, Michael B, additional, Nielsen, Louise D, additional, Osborn, Ares, additional, Osip, David, additional, Paegert, Martin, additional, Radford, Don J, additional, Santos, Nuno C, additional, Seager, Sara, additional, Shectman, Stephen A, additional, Srdoc, Gregor, additional, Strøm, Paul A, additional, Tan, Thiam-Guan, additional, Teske, Johanna K, additional, Vezie, Michael, additional, Watanabe, David, additional, Watkins, Cristilyn N, additional, Wheatley, Peter J, additional, Winn, Joshua N, additional, Wohler, Bill, additional, and Ziegler, Carl, additional

Published
2024
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15. The homogeneous characterisation of Ariel host stars

Author

Danielski, Camilla, Brucalassi, Anna, Benatti, Serena, Campante, Tiago, Delgado-Mena, Elisa, Rainer, Monica, Sacco, Germano, Adibekyan, Vardan, Biazzo, Katia, Bossini, Diego, Bruno, Giovanni, Casali, Giada, Kabath, Petr, Magrini, Laura, Micela, Giusi, Morello, Giuseppe, Palladino, Pietro, Sanna, Nicoletta, Sarkar, Subhajit, Sousa, Sérgio, Tsantaki, Maria, Turrini, Diego, and Van der Swaelmen, Mathieu

Published
2022
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16. New Mass and Radius Constraints on the LHS 1140 Planets: LHS 1140 b Is either a Temperate Mini-Neptune or a Water World

Author

Cadieux, Charles, primary, Plotnykov, Mykhaylo, additional, Doyon, René, additional, Valencia, Diana, additional, Jahandar, Farbod, additional, Dang, Lisa, additional, Turbet, Martin, additional, Fauchez, Thomas J., additional, Cloutier, Ryan, additional, Cherubim, Collin, additional, Artigau, Étienne, additional, Cook, Neil J., additional, Edwards, Billy, additional, Hallatt, Tim, additional, Charnay, Benjamin, additional, Bouchy, François, additional, Allart, Romain, additional, Mignon, Lucile, additional, Baron, Frédérique, additional, Barros, Susana C. C., additional, Benneke, Björn, additional, Canto Martins, B. L., additional, Cowan, Nicolas B., additional, De Medeiros, J. R., additional, Delfosse, Xavier, additional, Delgado-Mena, Elisa, additional, Dumusque, Xavier, additional, Ehrenreich, David, additional, Frensch, Yolanda G. C., additional, González Hernández, J. I., additional, Hara, Nathan C., additional, Lafrenière, David, additional, Curto, Gaspare Lo, additional, Malo, Lison, additional, Melo, Claudio, additional, Mounzer, Dany, additional, Passeger, Vera Maria, additional, Pepe, Francesco, additional, Poulin-Girard, Anne-Sophie, additional, Santos, Nuno C., additional, Sosnowska, Danuta, additional, Suárez Mascareño, Alejandro, additional, Thibault, Simon, additional, Vaulato, Valentina, additional, Wade, Gregg A., additional, and Wildi, François, additional

Published
2024
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17. TOI-332 b: a super dense Neptune found deep within the Neptunian desert

Author

Osborn, Ares, primary, Armstrong, David J, additional, Fernández Fernández, Jorge, additional, Knierim, Henrik, additional, Adibekyan, Vardan, additional, Collins, Karen A, additional, Delgado-Mena, Elisa, additional, Fridlund, Malcolm, additional, Gomes da Silva, João, additional, Hellier, Coel, additional, Jackson, David G, additional, King, George W, additional, Lillo-Box, Jorge, additional, Matson, Rachel A, additional, Matthews, Elisabeth C, additional, Santos, Nuno C, additional, Sousa, Sérgio G, additional, Stassun, Keivan G, additional, Tan, Thiam-Guan, additional, Ricker, George R, additional, Vanderspek, Roland, additional, Latham, David W, additional, Seager, Sara, additional, Winn, Joshua N, additional, Jenkins, Jon M, additional, Bayliss, Daniel, additional, Bouma, Luke G, additional, Ciardi, David R, additional, Collins, Kevin I, additional, Colón, Knicole D, additional, Crossfield, Ian J M, additional, Demangeon, Olivier D S, additional, Díaz, Rodrigo F, additional, Dorn, Caroline, additional, Dumusque, Xavier, additional, Keniger, Marcelo Aron Fetzner, additional, Figueira, Pedro, additional, Gan, Tianjun, additional, Goeke, Robert F, additional, Hadjigeorghiou, Andreas, additional, Hawthorn, Faith, additional, Helled, Ravit, additional, Howell, Steve B, additional, Nielsen, Louise D, additional, Osborn, Hugh P, additional, Quinn, Samuel N, additional, Sefako, Ramotholo, additional, Shporer, Avi, additional, Strøm, Paul A, additional, Twicken, Joseph D, additional, Vanderburg, Andrew, additional, and Wheatley, Peter J, additional

Published
2023
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18. Discovery and characterisation of two Neptune-mass planets orbiting HD 212729 with TESS

Author

Armstrong, David J, primary, Osborn, Ares, additional, Adibekyan, Vardan, additional, Delgado-Mena, Elisa, additional, Hojjatpanah, Saeed, additional, Howell, Steve B, additional, Hoyer, Sergio, additional, Knierim, Henrik, additional, Sousa, Sérgio G, additional, Stassun, Keivan G, additional, Veras, Dimitri, additional, Anderson, David R, additional, Bayliss, Daniel, additional, Bouchy, François, additional, Burke, Christopher J, additional, Christiansen, Jessie L, additional, Dumusque, Xavier, additional, Keniger, Marcelo Aron Fetzner, additional, Hadjigeorghiou, Andreas, additional, Hawthorn, Faith, additional, Helled, Ravit, additional, Jenkins, Jon M, additional, Latham, David W, additional, Lillo-Box, Jorge, additional, Nielsen, Louise D, additional, Osborn, Hugh P, additional, Rodrigues, José, additional, Rodriguez, David, additional, Santos, Nuno C, additional, Seager, Sara, additional, Strøm, Paul A, additional, Torres, Guillermo, additional, Twicken, Joseph D, additional, Udry, Stephane, additional, Wheatley, Peter J, additional, and Winn, Joshua N, additional

Published
2023
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19. TOI-908: a planet at the edge of the Neptune desert transiting a G-type star

Author

Hawthorn, Faith, primary, Bayliss, Daniel, additional, Armstrong, David J, additional, Fernández Fernández, Jorge, additional, Osborn, Ares, additional, Sousa, Sérgio G, additional, Adibekyan, Vardan, additional, Davoult, Jeanne, additional, Collins, Karen A, additional, Alibert, Yann, additional, Barros, Susana C C, additional, Bouchy, François, additional, Brogi, Matteo, additional, Ciardi, David R, additional, Daylan, Tansu, additional, Delgado Mena, Elisa, additional, Demangeon, Olivier D S, additional, Díaz, Rodrigo F, additional, Gan, Tianjun, additional, Horne, Keith, additional, Hoyer, Sergio, additional, Jenkins, Jon M, additional, Jensen, Eric L N, additional, Kielkopf, John F, additional, Kostov, Veselin, additional, Latham, David W, additional, Levine, Alan M, additional, Lillo-Box, Jorge, additional, Nielsen, Louise D, additional, Osborn, Hugh P, additional, Ricker, George R, additional, Rodrigues, José, additional, Santos, Nuno C, additional, Schwarz, Richard P, additional, Seager, Sara, additional, Serrano Bell, Juan, additional, Shporer, Avi, additional, Stockdale, Chris, additional, Strøm, Paul A, additional, Tenenbaum, Peter, additional, Udry, Stéphane, additional, Wheatley, Peter J, additional, Winn, Joshua N, additional, and Ziegler, Carl, additional

Published
2023
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20. TESS spots a mini-neptune interior to a hot saturn in the TOI-2000 system

Author

Sha, Lizhou, primary, Vanderburg, Andrew M, additional, Huang, Chelsea X, additional, Armstrong, David J, additional, Brahm, Rafael, additional, Giacalone, Steven, additional, Wood, Mackenna L, additional, Collins, Karen A, additional, Nielsen, Louise D, additional, Hobson, Melissa J, additional, Ziegler, Carl, additional, Howell, Steve B, additional, Torres-Miranda, Pascal, additional, Mann, Andrew W, additional, Zhou, George, additional, Delgado-Mena, Elisa, additional, Rojas, Felipe I, additional, Abe, Lyu, additional, Trifonov, Trifon, additional, Adibekyan, Vardan, additional, Sousa, Sérgio G, additional, Fajardo-Acosta, Sergio B, additional, Guillot, Tristan, additional, Howard, Saburo, additional, Littlefield, Colin, additional, Hawthorn, Faith, additional, Schmider, François-Xavier, additional, Eberhardt, Jan, additional, Tan, Thiam-Guan, additional, Osborn, Ares, additional, Schwarz, Richard P, additional, Strøm, Paul, additional, Jordán, Andrés, additional, Wang, Gavin, additional, Henning, Thomas, additional, Massey, Bob, additional, Law, Nicholas, additional, Stockdale, Chris, additional, Furlan, Elise, additional, Srdoc, Gregor, additional, Wheatley, Peter J, additional, Barrado Navascués, David, additional, Lissauer, Jack J, additional, Stassun, Keivan G, additional, Ricker, George R, additional, Vanderspek, Roland K, additional, Latham, David W, additional, Winn, Joshua N, additional, Seager, Sara, additional, Jenkins, Jon M, additional, Barclay, Thomas, additional, Bouma, Luke G, additional, Christiansen, Jessie L, additional, Guerrero, Natalia, additional, and Rose, Mark E, additional

Published
2023
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21. TOI-2498 b: a hot bloated super-Neptune within the Neptune desert

Author

Frame, Ginger, primary, Armstrong, David J, additional, Cegla, Heather M, additional, Fernández Fernández, Jorge, additional, Osborn, Ares, additional, Adibekyan, Vardan, additional, Collins, Karen A, additional, Delgado Mena, Elisa, additional, Giacalone, Steven, additional, Kielkopf, John F, additional, Santos, Nuno C, additional, Sousa, Sérgio G, additional, Stassun, Keivan G, additional, Ziegler, Carl, additional, Anderson, David R, additional, Barros, Susana C C, additional, Bayliss, Daniel, additional, Briceño, César, additional, Conti, Dennis M, additional, Dressing, Courtney D, additional, Dumusque, Xavier, additional, Figueira, Pedro, additional, Fong, William, additional, Gill, Samuel, additional, Hawthorn, Faith, additional, Jenkins, Jon M, additional, Jensen, Eric L N, additional, Keniger, Marcelo Aron F, additional, Latham, David W, additional, Law, Nicholas, additional, Lissauer, Jack J, additional, Mann, Andrew W, additional, Nielsen, Louise D, additional, Osborn, Hugh, additional, Paegert, Martin, additional, Seager, Sara, additional, Schwarz, Richard P, additional, Shporer, Avi, additional, Srdoc, Gregor, additional, Strøm, Paul A, additional, Winn, Joshua N, additional, and Wheatley, Peter J, additional

Published
2023
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22. TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf

Author

Hawthorn, Faith, primary, Bayliss, Daniel, additional, Wilson, Thomas G, additional, Bonfanti, Andrea, additional, Adibekyan, Vardan, additional, Alibert, Yann, additional, Sousa, Sérgio G, additional, Collins, Karen A, additional, Bryant, Edward M, additional, Osborn, Ares, additional, Armstrong, David J, additional, Abe, Lyu, additional, Acton, Jack S, additional, Addison, Brett C, additional, Agabi, Karim, additional, Alonso, Roi, additional, Alves, Douglas R, additional, Anglada-Escudé, Guillem, additional, Bárczy, Tamas, additional, Barclay, Thomas, additional, Barrado, David, additional, Barros, Susana C C, additional, Baumjohann, Wolfgang, additional, Bendjoya, Philippe, additional, Benz, Willy, additional, Bieryla, Allyson, additional, Bonfils, Xavier, additional, Bouchy, François, additional, Brandeker, Alexis, additional, Broeg, Christopher, additional, Brown, David J A, additional, Burleigh, Matthew R, additional, Buttu, Marco, additional, Cabrera, Juan, additional, Caldwell, Douglas A, additional, Casewell, Sarah L, additional, Charbonneau, David, additional, Charnoz, Sébastian, additional, Cloutier, Ryan, additional, Cameron, Andrew Collier, additional, Collins, Kevin I, additional, Conti, Dennis M, additional, Crouzet, Nicolas, additional, Czismadia, Szilárd, additional, Davies, Melvyn B, additional, Deleuil, Magali, additional, Delgado-Mena, Elisa, additional, Delrez, Laetitia, additional, Demangeon, Olivier D S, additional, Demory, Brice-Olivier, additional, Dransfield, Georgina, additional, Dumusque, Xavier, additional, Egger, Jo Ann, additional, Ehrenreich, David, additional, Eigmüller, Philipp, additional, Erickson, Anders, additional, Essack, Zahra, additional, Fortier, Andrea, additional, Fossati, Luca, additional, Fridlund, Malcolm, additional, Günther, Maximilian N, additional, Güdel, Manuel, additional, Gandolfi, Davide, additional, Gillard, Harvey, additional, Gillon, Michaël, additional, Gnilka, Crystal, additional, Goad, Michael R, additional, Goeke, Robert F, additional, Guillot, Tristan, additional, Hadjigeorghiou, Andreas, additional, Hellier, Coel, additional, Henderson, Beth A, additional, Heng, Kevin, additional, Hooton, Matthew J, additional, Horne, Keith, additional, Howell, Steve B, additional, Hoyer, Sergio, additional, Irwin, Jonathan M, additional, Jenkins, James S, additional, Jenkins, Jon M, additional, Jensen, Eric L N, additional, Kane, Stephen R, additional, Kendall, Alicia, additional, Kielkopf, John F, additional, Kiss, Laszlo L, additional, Lacedelli, Gaia, additional, Laskar, Jacques, additional, Latham, David W, additional, Etangs, Alain Lecavalier des, additional, Leleu, Adrien, additional, Lendl, Monika, additional, Lillo-Box, Jorge, additional, Lovis, Christophe, additional, Mékarnia, Djamel, additional, Massey, Bob, additional, Masters, Tamzin, additional, Maxted, Pierre F L, additional, Nascimbeni, Valerio, additional, Nielsen, Louise D, additional, O’Brien, Sean M, additional, Olofsson, Göran, additional, Osborn, Hugh P, additional, Pagano, Isabella, additional, Pallé, Enric, additional, Persson, Carina M, additional, Piotto, Giampaolo, additional, Plavchan, Peter, additional, Pollacco, Don, additional, Queloz, Didier, additional, Ragazzoni, Roberto, additional, Rauer, Heike, additional, Ribas, Ignasi, additional, Ricker, George, additional, Ségransan, Damien, additional, Salmon, Sébastien, additional, Santerne, Alexandre, additional, Santos, Nuno C, additional, Scandariato, Gaetano, additional, Schmider, François-Xavier, additional, Schwarz, Richard P, additional, Seager, Sara, additional, Shporer, Avi, additional, Simon, Attila E, additional, Smith, Alexis M S, additional, Srdoc, Gregor, additional, Steller, Manfred, additional, Suarez, Olga, additional, Szabó, Gyula M, additional, Teske, Johanna, additional, Thomas, Nicolas, additional, Tilbrook, Rosanna H, additional, Triaud, Amaury H M J, additional, Udry, Stéphane, additional, Van Grootel, Valérie, additional, Walton, Nicholas, additional, Wang, Sharon X, additional, Wheatley, Peter J, additional, Winn, Joshua N, additional, Wittenmyer, Robert A, additional, and Zhang, Hui, additional

Published
2023
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23. TESS spots a mini- interior to a hot saturn in the TOI-2000 system.

Author

Sha, Lizhou, Vanderburg, Andrew M, Huang, Chelsea X, Armstrong, David J, Brahm, Rafael, Giacalone, Steven, Wood, Mackenna L, Collins, Karen A, Nielsen, Louise D, Hobson, Melissa J, Ziegler, Carl, Howell, Steve B, Torres-Miranda, Pascal, Mann, Andrew W, Zhou, George, Delgado-Mena, Elisa, Rojas, Felipe I, Abe, Lyu, Trifonov, Trifon, and Adibekyan, Vardan

Subjects
MARKOV chain Monte Carlo, INNER planets, HOT Jupiters, SPECKLE interferometry, SATURN (Planet), PLANETARY mass
Abstract

Hot jupiters (P < 10 d, M > 60 M⊕) are almost always found alone around their stars, but four out of hundreds known have inner companion planets. These rare companions allow us to constrain the hot jupiter's formation history by ruling out high-eccentricity tidal migration. Less is known about inner companions to hot Saturn-mass planets. We report here the discovery of the TOI-2000 system, which features a hot Saturn-mass planet with a smaller inner companion. The mini-neptune TOI-2000 b (2.70 ± 0.15 R⊕, 11.0 ± 2.4 M⊕) is in a 3.10-d orbit, and the hot saturn TOI-2000 c (⁠|$8.14_{-0.30}^{+0.31}$|  R⊕ , |$81.7_{-4.6}^{+4.7}$|  M⊕) is in a 9.13-d orbit. Both planets transit their host star TOI-2000 (TIC 371188886, V  = 10.98, TESS magnitude = 10.36), a metal-rich ([Fe/H] = 0.439 |$_{-0.043}^{+0.041}$|⁠) G dwarf  173 pc away. TESS observed the two planets in sectors 9–11 and 36–38, and we followed up with ground-based photometry, spectroscopy, and speckle imaging. Radial velocities from CHIRON, FEROS, and HARPS allowed us to confirm both planets by direct mass measurement. In addition, we demonstrate constraining planetary and stellar parameters with MIST stellar evolutionary tracks through Hamiltonian Monte Carlo under the PyMC framework, achieving higher sampling efficiency and shorter run time compared to traditional Markov chain Monte Carlo. Having the brightest host star in the V band among similar systems, TOI-2000 b and c are superb candidates for atmospheric characterization by the JWST , which can potentially distinguish whether they formed together or TOI-2000 c swept along material during migration to form TOI-2000 b. [ABSTRACT FROM AUTHOR]

Published
2023
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24. Diversity of terrestrial planets: a link to the chemical makeup of their host stars

Author

Adibekyan, Vardan, primary, Dorn, Caroline, additional, Sousa, Sérgio, additional, Santos, Nuno, additional, Bitsch, Bertram, additional, Israelian, Garik, additional, Mordasini, Christoph, additional, Barros, Susana, additional, Delgado Mena, Elisa, additional, Demangeon, Olivier, additional, Faria, João, additional, Figueira, Pedro, additional, Hakobyan, Artur, additional, Osagh, Mahmoudreza, additional, Soares, Bárbara, additional, Kunitomo, Masanobu, additional, Takeda, Yoichi, additional, Jofré, Emiliano, additional, Petrucc, Romina, additional, and Martioli, Eder, additional

Published
2022
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25. Carbon abundances and C/O ratios for planet hosts

Author

Delgado-Mena, Elisa

Subjects
Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

We present homogeneous carbon and oxygen abundances for a sample of 757 FGK stars in the HARPS-GTO sample, from which 101 stars host Jupiter-mass companions and 22 hosts Neptunian-mass companions. We derive C/O ratios using oxygen abundances from the 6300A [OI] forbidden line (low excitation potential) and with the 6158A line (high excitation potential as the CI optical lines used to determine carbon abundances). We find a tentative evidence that stars with low-mass planets at lower metallicities have higher [C/Fe] ratios than stars without planets at the same metallicity, in the same way as previously found for alpha elements and Zn. The elemental C/O ratios for the vast majority of our stars are below 0.8 when using the oxygen line at 6158Å but the forbidden oxygen line at 6300Å provides systematically higher C/O values (going above 1.2 in few cases) which also show a dependence on Teff. Moreover, by using different atmosphere models the C/O ratios can have a non negligible difference for cool stars. Therefore, C/O ratios should be scaled to a common solar reference in order to correctly evaluate its behaviour. We find no significant differences in the distribution of C/O ratios for the different populations of planet hosts except when comparing the stars without detected planets with the stars hosting Jupiter type planets. However, we note that this difference might be caused by the different metallicity distributions of both populations.

Published
2021
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26. A compositional link between rocky exoplanets and their host stars

Author

Adibekyan, Vardan, primary, Dorn, Caroline, additional, Sousa, Sérgio G., additional, Santos, Nuno C., additional, Bitsch, Bertram, additional, Israelian, Garik, additional, Mordasini, Christoph, additional, Barros, Susana C. C., additional, Delgado Mena, Elisa, additional, Demangeon, Olivier D. S., additional, Faria, João P., additional, Figueira, Pedro, additional, Hakobyan, Artur A., additional, Oshagh, Mahmoudreza, additional, Soares, Bárbara M. T. B., additional, Kunitomo, Masanobu, additional, Takeda, Yoichi, additional, Jofré, Emiliano, additional, Petrucci, Romina, additional, and Martioli, Eder, additional

Published
2021
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27. The homogeneous characterisation of Ariel host stars

Author

Danielski, Camilla, primary, Brucalassi, Anna, additional, Benatti, Serena, additional, Campante, Tiago, additional, Delgado-Mena, Elisa, additional, Rainer, Monica, additional, Sacco, Germano, additional, Adibekyan, Vardan, additional, Biazzo, Katia, additional, Bossini, Diego, additional, Bruno, Giovanni, additional, Casali, Giada, additional, Kabath, Petr, additional, Magrini, Laura, additional, Micela, Giusi, additional, Morello, Giuseppe, additional, Palladino, Pietro, additional, Sanna, Nicoletta, additional, Sarkar, Subhajit, additional, Sousa, Sérgio, additional, Tsantaki, Maria, additional, Turrini, Diego, additional, and Van der Swaelmen, Mathieu, additional

Published
2021
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28. ODUSSEAS: a machine learning tool to derive effective temperature and metallicity for M dwarf stars

Author

Antoniadis-Karnavas, Alexandros, Sousa, Sergio, Delgado-Mena, Elisa, Santos, Nuno, Teixeira, Guilherme, and Neves, Vasco

Subjects
Fundamental parameters, Cool Stars on the main sequence, Data analysis, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Stellar atmospheres, Astrophysics::Galaxy Astrophysics, Spectroscopy
Abstract

The derivation of spectroscopic parameters for M dwarf stars is very important in the fields of stellar and exoplanet characterization. We present our easy-to-use computational tool ODUSSEAS, which is based on the measurement of pseudo equivalent widths for more than 4000 stellar absorption lines and on the use of the machine learning Python package "scikit-learn" for predicting the stellar parameters. It offers a fast and reliable derivation of effective temperature and [Fe/H] for M dwarf stars using their 1D spectra and resolutions as input. The main advantage of this tool is that it can operate in an automatic fashion for spectra of different resolutions and wavelength ranges in the optical. ODUSSEAS is able to derive parameters accurately and with high precision, having precision errors of 30 K for Teff and 0.04 dex for [Fe/H]. The results are consistent for spectra with resolutions between 48000 and 115000 and S/N above 20.

Published
2021

30. Determination of stellar parameters for Ariel targets: a comparison analysis between different spectroscopic methods

Author

Brucalassi, Anna, primary, Tsantaki, Maria, additional, Magrini, Laura, additional, Sousa, Sergio, additional, Danielski, Camilla, additional, Biazzo, Katia, additional, Casali, Giada, additional, Van der Swaelmen, Mathieu, additional, Rainer, Monica, additional, Adibekyan, Vardan, additional, Delgado-Mena, Elisa, additional, and Sanna, Nicoletta, additional

Published
2021
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32. The metallicity–period–mass diagram of low-mass exoplanets

Author

Sousa, Sérgio G, primary, Adibekyan, Vardan, additional, Santos, Nuno C, additional, Mortier, Annelies, additional, Barros, Susana C C, additional, Delgado-Mena, Elisa, additional, Demangeon, Olivier, additional, Israelian, Garik, additional, Faria, João P, additional, Figueira, Pedro, additional, Rojas-Ayala, Barbara, additional, Tsantaki, Maria, additional, Andreasen, Daniel T, additional, Brandão, Isa, additional, Ferreira, Andressa C S, additional, Montalto, Marco, additional, and Santerne, Alexandre, additional

Published
2019
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