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6 results on '"Geier, Stefan"'

1. SN 2020pvb: a Type IIn-P supernova with a precursor outburst

Author

Elias-Rosa, Nancy, Brennan, Seán J., Benetti, Stefano, Cappellaro, Enrico, Pastorello, Andrea, Kozyreva, Alexandra, Lundqvist, Peter, Fraser, Morgan, Anderso, Joseph P., Cai, Yong-Zhi, Chen, Ting-Wan, Dennefeld, Michel, Gromadzki, Mariusz, Gutiérrez, Claudia P., Ihanec, Nada, Inserra, Cosimo, Kankare, Erkki, Kotak, Rubina, Mattila, Seppo, Moran, Shane, Müller-Bravo, Tomás E., Pessi, Priscila J., Pignata, Giuliano, Reguitti, Andrea, Reynolds, Thomas M., Smartt, Stephen J., Smith, Ken, Tartaglia, Leonardo, Valerin, Giorgio, de Boer, Thomas, Chambers, Kenneth, Gal-Yam, Avishay, Gao, Hua, Geier, Stefan, Mazzali, Paolo A., Nicholl, Matt, Ragosta, Fabio, Rest, Armin, Yaron, Ofer, and Young, David R.

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present photometric and spectroscopic data sets for SN 2020pvb, a Type IIn-P supernova (SN) similar to SNe 1994W, 2005cl, 2009kn and 2011ht, with a precursor outburst detected (PS1 w-band ~ -13.8 mag) around four months before the B-band maximum light. SN 2020pvb presents a relatively bright light curve peaking at M_B = -17.95 +- 0.30 mag and a plateau lasting at least 40 days before it went in solar conjunction. After this, the object is no longer visible at phases > 150 days above -12.5 mag in the B-band, suggesting that the SN 2020pvb ejecta interacts with a dense spatially confined circumstellar envelope. SN 2020pvb shows in its spectra strong Balmer lines and a forest of FeII lines with narrow P Cygni profiles. Using archival images from the Hubble Space Telescope, we constrain the progenitor of SN 2020pvb to have a luminosity of log(L/L_sun) <= 5.4, ruling out any single star progenitor over 50 M_sun. All in all, SN 2020pvb is a Type IIn-P whose progenitor star had an outburst ~ 0.5 yr before the final explosion, the material lost during this outburst is probably playing a role in shaping the physical properties of the supernova., Comment: 14 pages + 10 appendix pages, 12 figures + 2 appendix figures, 8 appendix tables. Accepted for publication in A&A

Published
2024
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2. Photometry of the Didymos System across the DART Impact Apparition

Author

Moskovitz, Nicholas, primary, Thomas, Cristina, additional, Pravec, Petr, additional, Lister, Tim, additional, Polakis, Tom, additional, Osip, David, additional, Kareta, Theodore, additional, Rożek, Agata, additional, Chesley, Steven R., additional, Naidu, Shantanu P., additional, Scheirich, Peter, additional, Ryan, William, additional, Ryan, Eileen, additional, Skiff, Brian, additional, Snodgrass, Colin, additional, Knight, Matthew M., additional, Rivkin, Andrew S., additional, Chabot, Nancy L., additional, Ayvazian, Vova, additional, Belskaya, Irina, additional, Benkhaldoun, Zouhair, additional, Berteşteanu, Daniel N., additional, Bonavita, Mariangela, additional, Bressi, Terrence H., additional, Brucker, Melissa J., additional, Burgdorf, Martin J., additional, Burkhonov, Otabek, additional, Burt, Brian, additional, Contreras, Carlos, additional, Chatelain, Joseph, additional, Choi, Young-Jun, additional, Daily, Matthew, additional, de León, Julia, additional, Ergashev, Kamoliddin, additional, Farnham, Tony, additional, Fatka, Petr, additional, Ferrais, Marin, additional, Geier, Stefan, additional, Gomez, Edward, additional, Greenstreet, Sarah, additional, Gröller, Hannes, additional, Hergenrother, Carl, additional, Holt, Carrie, additional, Hornoch, Kamil, additional, Husárik, Marek, additional, Inasaridze, Raguli, additional, Jehin, Emmanuel, additional, Khalouei, Elahe, additional, Eluo, Jean-Baptiste Kikwaya, additional, Kim, Myung-Jin, additional, Krugly, Yurij, additional, Kučáková, Hana, additional, Kušnirák, Peter, additional, Larsen, Jeffrey A., additional, Lee, Hee-Jae, additional, Lejoly, Cassandra, additional, Licandro, Javier, additional, Longa-Peña, Penélope, additional, Mastaler, Ronald A., additional, McCully, Curtis, additional, Moon, Hong-Kyu, additional, Morrell, Nidia, additional, Nath, Arushi, additional, Oszkiewicz, Dagmara, additional, Parrott, Daniel, additional, Phillips, Liz, additional, Popescu, Marcel M., additional, Pray, Donald, additional, Prodan, George Pantelimon, additional, Rabus, Markus, additional, Read, Michael T., additional, Reva, Inna, additional, Roark, Vernon, additional, Santana-Ros, Toni, additional, Scotti, James V., additional, Tatara, Taiyo, additional, Thirouin, Audrey, additional, Tholen, David, additional, Troianskyi, Volodymyr, additional, Tubbiolo, Andrew F., additional, and Villa, Katelyn, additional

Published
2024
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3. Detailed spectrophotometric analysis of the superluminous and fast evolving SN 2019neq

Author

National Natural Science Foundation of China, Ministero dell'Istruzione, dell'Università e della Ricerca, European Commission, Junta de Andalucía, Istituto Nazionale di Astrofisica, Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Ministerio de Ciencia, Innovación y Universidades (España), Generalitat de Catalunya, Fiore, Achille, Benetti, Stefano, Tartaglia, Leonardo, Jerkstrand, Anders, Salmaso, Irene, Tomasella, Lina, Morales-Garoffolo, A., Geier, Stefan, Elias-Rosa, Nancy, Cappellaro, Enrico, Wang, Xiaofeng, Mo, Jun, Chen, Zhihao, Mazzali, Paolo A., Ciolfi, Riccardo, Cai, Yongzhi, Fraser, Morgan, Gutiérrez, Claudia P., Karamehmetoglu, Emir, Kuncarayakti, Hanindyo, Moran, Shane, Ochner, Paolo, Reguitti, Andrea, Reynolds, Thomas M., Valerin, Giorgio, National Natural Science Foundation of China, Ministero dell'Istruzione, dell'Università e della Ricerca, European Commission, Junta de Andalucía, Istituto Nazionale di Astrofisica, Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Ministerio de Ciencia, Innovación y Universidades (España), Generalitat de Catalunya, Fiore, Achille, Benetti, Stefano, Tartaglia, Leonardo, Jerkstrand, Anders, Salmaso, Irene, Tomasella, Lina, Morales-Garoffolo, A., Geier, Stefan, Elias-Rosa, Nancy, Cappellaro, Enrico, Wang, Xiaofeng, Mo, Jun, Chen, Zhihao, Mazzali, Paolo A., Ciolfi, Riccardo, Cai, Yongzhi, Fraser, Morgan, Gutiérrez, Claudia P., Karamehmetoglu, Emir, Kuncarayakti, Hanindyo, Moran, Shane, Ochner, Paolo, Reguitti, Andrea, Reynolds, Thomas M., and Valerin, Giorgio

Abstract

SN 2019neq was a very fast evolving superluminous supernova. At a redshift z = 0.1059, its peak absolute magnitude was −21.5 ± 0.2 mag in g band. In this work, we present data and analysis from an extensive spectrophotometric follow-up campaign using multiple observational facilities. Thanks to a nebular spectrum of SN 2019neq, we investigated some of the properties of the host galaxy at the location of SN 2019neq and found that its metallicity and specific star formation rate are in a good agreement with those usually measured for SLSNe-I hosts. We then discuss the plausibility of the magnetar and the circumstellar interaction scenarios to explain the observed light curves, and interpret a nebular spectrum of SN 2019neq using published SUMO radiative-transfer models. The results of our analysis suggest that the spin-down radiation of a millisecond magnetar with a magnetic field B 6 × 1014 G could boost the luminosity of SN 2019neq.

Published
2024

4. Supplementary data for Detailed spectrophotometric analysis of the superluminous and fast evolving SN 2019neq

Author

Fiore, Achille, Benetti, Stefano, Tartaglia, Leonardo, Jerkstrand, Anders, Salmaso, Irene, Tomasella, Lina, Morales-Garoffolo, A., Geier, Stefan, Elias-Rosa, Nancy, Cappellaro, Enrico, Wang, Xiaofeng, Mo, Jun, Chen, Zhihao, Mazzali, Paolo A., Ciolfi, Riccardo, Cai, Yongzhi, Fraser, Morgan, Gutiérrez, Claudia P., Karamehmetoglu, Emir, Kuncarayakti, Hanindyo, Moran, Shane, Ochner, Paolo, Reguitti, Andrea, Reynolds, Thomas M., Valerin, Giorgio, Fiore, Achille, Benetti, Stefano, Tartaglia, Leonardo, Jerkstrand, Anders, Salmaso, Irene, Tomasella, Lina, Morales-Garoffolo, A., Geier, Stefan, Elias-Rosa, Nancy, Cappellaro, Enrico, Wang, Xiaofeng, Mo, Jun, Chen, Zhihao, Mazzali, Paolo A., Ciolfi, Riccardo, Cai, Yongzhi, Fraser, Morgan, Gutiérrez, Claudia P., Karamehmetoglu, Emir, Kuncarayakti, Hanindyo, Moran, Shane, Ochner, Paolo, Reguitti, Andrea, Reynolds, Thomas M., and Valerin, Giorgio

Published
2024

5. Detailed spectrophotometric analysis of the superluminous and fast evolving SN 2019neq

Author

Fiore, Achille, Benetti, Stefano, Tartaglia, Leonardo, Jerkstrand, Anders, Salmaso, Irene, Tomasella, Lina, Morales-garoffolo, Antonia, Geier, Stefan, Elias-rosa, Nancy, Cappellaro, Enrico, Wang, Xiaofeng, Mo, Jun, Chen, Zhihao, Yan, Shengyu, Pastorello, Andrea, Mazzali, Paolo A, Ciolfi, Riccardo, Cai, Yongzhi, Fraser, Morgan, Gutiérrez, Claudia P, Karamehmetoglu, Emir, Kuncarayakti, Hanindyo, Moran, Shane, Ochner, Paolo, Reguitti, Andrea, Reynolds, Thomas M, Valerin, Giorgio, Fiore, Achille, Benetti, Stefano, Tartaglia, Leonardo, Jerkstrand, Anders, Salmaso, Irene, Tomasella, Lina, Morales-garoffolo, Antonia, Geier, Stefan, Elias-rosa, Nancy, Cappellaro, Enrico, Wang, Xiaofeng, Mo, Jun, Chen, Zhihao, Yan, Shengyu, Pastorello, Andrea, Mazzali, Paolo A, Ciolfi, Riccardo, Cai, Yongzhi, Fraser, Morgan, Gutiérrez, Claudia P, Karamehmetoglu, Emir, Kuncarayakti, Hanindyo, Moran, Shane, Ochner, Paolo, Reguitti, Andrea, Reynolds, Thomas M, and Valerin, Giorgio

Published
2024

6. A bright triple transient that vanished within 50 min.

Author

Solano, Enrique, Marcy, Geoffrey W, Villarroel, Beatriz, Geier, Stefan, Streblyanska, Alina, Lombardi, Gianluca, Bär, Rudolf E, and Andruk, Vitaly N

Subjects
GRAVITATIONAL lenses, TELESCOPES, OBSERVATORIES, SURFACE brightness (Astronomy), IMAGE processing
Abstract

We report on three optically bright, ∼16th mag, point sources within 10 arcsec of each other that vanished within 1 h, based on two consecutive exposures at Palomar Observatory on 1952 July 19 (POSS I Red and Blue). The three point sources have continued to be absent in telescope exposures during 71 yr with detection thresholds of ∼21st mag. We obtained two deep exposures with the 10.4-m Gran Telescopio Canarias on 2023 April 25 and 27 in r and g band, both reaching magnitude 25.5 (3σ). The three point sources are still absent, implying they have dimmed by more than 10 mag within an hour back in 1952. When bright in 1952, the most isolated transient source has a profile nearly the same as comparison stars, implying the sources are subarcsec in angular size and they exhibit no elongation due to movement. This triple transient has observed properties similar to other cases where groups of transients ('multiple transients') have appeared and vanished in a small region within a plate exposure. The explanation for these three transients and the previously reported cases remains unclear. Models involving background objects that are optically luminous for less than 1 h coupled with foreground gravitational lensing seem plausible. If so, a significant population of massive objects with structure serving as the lenses, to produce three images, are required to explain the subhour transients. [ABSTRACT FROM AUTHOR]

Published
2024
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