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3 results on '"Barkaoui, Khalid"'

1. A roadmap for the atmospheric characterization of terrestrial exoplanets with JWST

Author

de Wit, Julien, Doyon, Rene, Rackham, Benjamin V, Lim, Olivia, Ducrot, Elsa, Kreidberg, Laura, Benneke, Bjoern, Ribas, Ignasi, Berardo, David, Niraula, Prajwal, Iyer, Aishwarya, Shapiro, Alexander, Kostogryz, Nadiia, Witzke, Veronika, Gillon, Michael, Agol, Eric, Meadows, Victoria, Burgasser, Adam J, Owen, James E, Fortney, Jonathan J, Selsis, Franck, Bello-Arufe, Aaron, de Beurs, Zoe, Bolmont, Emeline, Cowan, Nicolas, Dong, Chuanfei, Drake, Jeremy J, Garcia, Lionel, Greene, Thomas, Haworth, Thomas, Hu, Renyu, Kane, Stephen R, Kervella, Pierre, Koll, Daniel, Krissansen-Totton, Joshua, Lagage, Pierre-Olivier, Lichtenberg, Tim, Lustig-Yaeger, Jacob, Lingam, Manasvi, Turbet, Martin, Seager, Sara, Barkaoui, Khalid, Bell, Taylor J, Burdanov, Artem, Cadieux, Charles, Charnay, Benjamin, Cloutier, Ryan, Cook, Neil J, Correia, Alexandre CM, Dang, Lisa, Daylan, Tansu, Delrez, Laetitia, Edwards, Billy, Fauchez, Thomas J, Flagg, Laura, Fraschetti, Federico, Haqq-Misra, Jacob, Huang, Ziyu, Iro, Nicolas, Jayawardhana, Ray, Jehin, Emmanuel, Jin, Meng, Kite, Edwin, Kitzmann, Daniel, Kral, Quentin, Lafreniere, David, Libert, Anne-Sophie, Liu, Beibei, Mohanty, Subhanjoy, Morris, Brett M, Murray, Catriona A, Piaulet, Caroline, Pozuelos, Francisco J, Radica, Michael, Ranjan, Sukrit, Rathcke, Alexander, Roy, Pierre-Alexis, Schwieterman, Edward W, Turner, Jake D, Triaud, Amaury, and Way, Michael J

Subjects
Astronomical Sciences, Physical Sciences, Astronomical sciences, Particle and high energy physics, Space sciences
Published
2024

2. Vetting of 384 TESS Objects of Interest with TRICERATOPS and Statistical Validation of 12 Planet Candidates

Author

Giacalone, Steven, Dressing, Courtney D, Jensen, Eric LN, Collins, Karen A, Ricker, George R, Vanderspek, Roland, Seager, S, Winn, Joshua N, Jenkins, Jon M, Barclay, Thomas, Barkaoui, Khalid, Cadieux, Charles, Charbonneau, David, Collins, Kevin I, Conti, Dennis M, Doyon, René, Evans, Phil, Ghachoui, Mourad, Gillon, Michaël, Guerrero, Natalia M, Hart, Rhodes, Jehin, Emmanuël, Kielkopf, John F, McLean, Brian, Murgas, Felipe, Palle, Enric, Parviainen, Hannu, Pozuelos, Francisco J, Relles, Howard M, Shporer, Avi, Socia, Quentin, Stockdale, Chris, Tan, Thiam-Guan, Torres, Guillermo, Twicken, Joseph D, Waalkes, William C, and Waite, Ian A

Subjects
Exoplanet astronomy, Astrostatistics, Planet hosting stars, Exoplanets, astro-ph.EP, astro-ph.IM, astro-ph.SR, Astronomical and Space Sciences, Astronomy & Astrophysics
Abstract

We present TRICERATOPS, a new Bayesian tool that can be used to vet and validate TESS Objects of Interest (TOIs). We test the tool on 68 TOIs that have been previously confirmed as planets or rejected as astrophysical false positives. By looking in the false-positive probability (FPP)-nearby false-positive probability (NFPP) plane, we define criteria that TOIs must meet to be classified as validated planets (FPP < 0.015 and NFPP < 10-3), likely planets (FPP < 0.5 and NFPP < 10-3), and likely nearby false positives (NFPP > 10-1). We apply this procedure on 384 unclassified TOIs and statistically validate 12, classify 125 as likely planets, and classify 52 as likely nearby false positives. Of the 12 statistically validated planets, 9 are newly validated. TRICERATOPS is currently the only TESS vetting and validation tool that models transits from nearby contaminant stars in addition to the target star. We therefore encourage use of this tool to prioritize follow-up observations that confirm bona fide planets and identify false positives originating from nearby stars.

Published
2021

3. Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1

Author

Gillon, Michaël, Triaud, Amaury HMJ, Demory, Brice-Olivier, Jehin, Emmanuël, Agol, Eric, Deck, Katherine M, Lederer, Susan M, de Wit, Julien, Burdanov, Artem, Ingalls, James G, Bolmont, Emeline, Leconte, Jeremy, Raymond, Sean N, Selsis, Franck, Turbet, Martin, Barkaoui, Khalid, Burgasser, Adam, Burleigh, Matthew R, Carey, Sean J, Chaushev, Aleksander, Copperwheat, Chris M, Delrez, Laetitia, Fernandes, Catarina S, Holdsworth, Daniel L, Kotze, Enrico J, Van Grootel, Valérie, Almleaky, Yaseen, Benkhaldoun, Zouhair, Magain, Pierre, and Queloz, Didier

Subjects
Space Sciences, Physical Sciences, Astronomical Sciences, Exobiology, Extraterrestrial Environment, Planets, Stars, Celestial, Temperature, Water, astro-ph.EP, General Science & Technology
Abstract

One aim of modern astronomy is to detect temperate, Earth-like exoplanets that are well suited for atmospheric characterization. Recently, three Earth-sized planets were detected that transit (that is, pass in front of) a star with a mass just eight per cent that of the Sun, located 12 parsecs away. The transiting configuration of these planets, combined with the Jupiter-like size of their host star-named TRAPPIST-1-makes possible in-depth studies of their atmospheric properties with present-day and future astronomical facilities. Here we report the results of a photometric monitoring campaign of that star from the ground and space. Our observations reveal that at least seven planets with sizes and masses similar to those of Earth revolve around TRAPPIST-1. The six inner planets form a near-resonant chain, such that their orbital periods (1.51, 2.42, 4.04, 6.06, 9.1 and 12.35 days) are near-ratios of small integers. This architecture suggests that the planets formed farther from the star and migrated inwards. Moreover, the seven planets have equilibrium temperatures low enough to make possible the presence of liquid water on their surfaces.

Published
2017

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