TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star
Article
Article Title | TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Addison, Brett C. (Author), Wright, Duncan J. (Author), Nicholson, Belinda A. (Author), Cale, Bryson (Author), Mocnik, Teo (Author), Huber, Daniel (Author), Plavchan, Peter (Author), Wittenmyer, Robert A. (Author), Vanderburg, Andrew (Author), Chaplin, William J. (Author), Chontos, Ashley (Author), Clark, Jake T. (Author), Eastman, Jason D. (Author), Ziegler, Carl (Author), Brahm, Rafael (Author), Carter, Bradley D. (Author), Clerte, Mathieu (Author), Espinoza, Nestor (Author), Horner, Jonathan (Author), Bentley, John (Author), Jordan, Andres (Author), Kane, Stephen R. (Author), Kielkopf, John F. (Author), Laychock, Emilie (Author), Mengel, Matthew W. (Author), Okumura, Jack (Author), Stassun, Keivan G. (Author), Bedding, Timothy R. (Author), Bowler, Brendan P. (Author), Burnelis, Andrius (Author), Blanco-Cuaresma, Sergi (Author), Collins, Michaela (Author), Crossfield, Ian (Author), Davis, Allen B. (Author), Evensberget, Dag (Author), Heitzmann, Alexis (Author), Howell, Steve B. (Author), Law, Nicholas (Author), Mann, Andrew W. (Author), Marsden, Stephen C. (Author), Matson, Rachel A. (Author), O'Connor, James (Author), Shporer, Avi (Author), Stevens, Catherine (Author), Tinney, C. G. (Author), Tylor, Christopher (Author), Wang, Songhu (Author), Zhang, Hui (Author), Henning, Thomas (Author), Kossakowski, Diana (Author), Ricker, George (Author), Sarkis, Paula (Author), Schlecker, Martin (Author), Torres, Pascal (Author), Vanderspek, Roland (Author), Latham, David W. (Author), Seager, Sara (Author), Winn, Joshua N. (Author), Jenkins, Jon M. (Author), Mireles, Ismael (Author), Rowden, Pam (Author), Pepper, Joshua (Author), Daylan, Tansu (Author), Schlieder, Joshua E. (Author), Collins, Karen A. (Author), Collins, Kevin I. (Author), Tan, Thiam-Guan (Author), Ball, Warrick H. (Author), Basu, Sarbani (Author), Buzasi, Derek L. (Author), Campante, Tiago L. (Author), Corsaro, Enrico (Author), Gonzalez-Cuesta, Lucia (Author), Davies, Guy R. (Author), de Almeida, Leandro (Author), do Nascimento Jr., Jose-Dias (Author), Garcia, Rafael A. (Author), Guo, Zhao (Author), Handberg, Rasmus (Author), Hekker, Saskia (Author), Hey, Daniel R. (Author), Kallinger, Thomas (Author), Kawaler, Steven D. (Author), Kayhan, Cenk (Author), Kuszlewicz, James S. (Author), Lund, Mikkel N. (Author), Lyttle, Alexander (Author), Mathur, Savita (Author), Miglio, Andrea (Author), Mosser, Benoit (Author), Nielsen, Martin B. (Author), Serenelli, Aldo M. (Author), Aguirre, Victor Silva (Author) and Themeßl, Nathalie (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 502 (3), pp. 3704-3722 |
Number of Pages | 19 |
Year | 2021 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/staa3960 |
Web Address (URL) | https://academic.oup.com/mnras/article/502/3/3704/6054535 |
Abstract | We report the discovery of a warm sub-Saturn, TOI-257b (HD 19916b), based on data from NASA's Transiting Exoplanet Survey Satellite (TESS). The transit signal was detected by TESS and confirmed to be of planetary origin based on radial velocity observations. An analysis of the TESS photometry, the Minerva-Australis, FEROS, and HARPS radial velocities, and the asteroseismic data of the stellar oscillations reveals that TOI-257b has a mass of MP = 0.138 ± 0.023 M J (43.9 ± 7.3, M⊕), a radius of RP = 0.639 ± 0.013 R J (7.16 ± 0.15, R ⊕), bulk density of 0.65+0.12-0.11 (cgs), and period 18.38818 +0.00085 -0.00084 days. TOI-257b orbits a bright (V = 7.612 mag) somewhat evolved late F-type star with M∗ = 1.390 ± 0.046 rm M sun, R∗ = 1.888 ± 0.033 Rsun, Teff = 6075 ± 90 rm K, and vsin i = 11.3 ± 0.5 km s-1. Additionally, we find hints for a second non-transiting sub-Saturn mass planet on a ∼71 day orbit using the radial velocity data. This system joins the ranks of a small number of exoplanet host stars (∼100) that have been characterized with asteroseismology. Warm sub-Saturns are rare in the known sample of exoplanets, and thus the discovery of TOI-257b is important in the context of future work studying the formation and migration history of similar planetary systems. |
Keywords | planetary systems; techniques: radial velocities; techniques; photometric; techniques: spectroscopic; asteroseismology; stars:; individual (TIC 200723869/TOI-257); Astrophysics - Earth and Planetary; Astrophysics; Astrophysics - Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Centre for Astrophysics |
Centre for Astrophysics | |
George Mason University, United States | |
University of California Riverside, United Sates | |
University of Hawaii, United States | |
University of Birmingham, United Kingdom | |
Aarhus University, Denmark | |
Center for Astrophysics Harvard and Smithsonian, United States | |
University of Toronto, Canada | |
Adolfo Ibanez University, Chile | |
Millennium Institute for Astrophysics, Chile | |
Space Telescope Science Institute, United States | |
University of New South Wales | |
University of Louisville, United States | |
Kutztown University, United States | |
Vanderbilt University, United States | |
Fisk University, United States | |
University of Sydney | |
University of Texas at Austin, United States | |
Westminster College, United States | |
Massachusetts Institute of Technology, United States | |
University of Kansas, United States | |
Yale University, United States | |
NASA Ames Research Center, United States | |
University of North Carolina at Chapel Hill, United States | |
United States Naval Observatory, United States | |
Indiana University Bloomington, United States | |
Nanjing University, China | |
Max Planck Institute for Astronomy, Germany | |
Pontifical Catholic University of Chile, Chile | |
Princeton University, United States | |
Open University, United Kingdom | |
Lehigh University, United States | |
NASA Goddard Space Flight Center, United States | |
Perth Exoplanet Survey Telescope Observatory, Australia | |
Florida Gulf Coast University, United States | |
University of Porto, Portugal | |
INAF - Catania Astrophysical Observatory, Italy | |
Institute of Astrophysics of the Canary Islands, Spain | |
University of La Laguna, Spain | |
Federal University of Rio Grande do Norte, Brazil | |
Paris-Saclay University, France | |
Paris Diderot University, France | |
Pennsylvania State University, United States | |
Heidelberg University, Germany | |
University of Vienna, Austria | |
Iowa State University, United States | |
Erciyes University, Turkiye | |
Max Planck Institute for Solar System Research, Germany | |
University of Paris, France | |
New York University Abu Dhabi, UAE | |
Institute of Space Sciences, Spain | |
Institute of Space Studies of Catalonia (IEEC), Spain |
https://research.usq.edu.au/item/q612v/toi-257b-hd-19916b-a-warm-sub-saturn-orbiting-an-evolved-f-type-star
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