期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 502, 期 3, 页码 3704-3722出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa3960
关键词
asteroseismology; techniques: photometric; techniques: radial velocities; techniques: spectroscopic; planetary systems; stars: individual (TIC 200723869/TOI-257)
资金
- Australian Research Council [LE160100001, DP180100972]
- Mount Cuba Astronomical Foundation
- University of Southern Queensland
- University of New South Wales, Australia
- Massachusetts Institute of Technology
- Nanjing University
- George Mason University
- University of Louisville
- University of California Riverside
- University of Florida
- University of Texas at Austin
- National Science Foundation [AST-1909209, AST-1717000, 1559487]
- NASA's ScienceMission directorate
- NASA Exoplanet Exploration Program
- National Aeronautics and Space Administration through the TESS Guest Investigator Program [80NSSC18K1585]
- National Science Foundation through the Graduate Research Fellowship Program [DGE 1842402]
- Science and Technology Facilities Council
- UK Space Agency
- Danish National Research Foundation [DNRF106]
- National Fund for Scientific and Technological Development Post-doctoral Fellowship Project [3180246]
- Millennium Institute of Astrophysics (MAS)
- Natural Science Foundation of China (NSFC) [11673011, 11933001]
- FONDECYT [1171208]
- Ministry for the Economy, Development, and Tourism's Programa Iniciativa Cientifica Milenio [IC 120009]
- Spanish Government [ESP2017-82674-R]
- Generalitat de Catalunya [2017-SGR-1131]
- European Research Council Consolidator Grant funding scheme (project ASTEROCHRONOMETRY) [772293]
- PLAnetary Transits and Oscillations of stars grant from the Centre National d' Etudes Spatiales
- Spanish Ministry
- Ramon y Cajal fellowship [RYC-2015-17697]
- European Union's Horizon 2020 research and innovation programme under the Marie SklodowskaCurie grant [792848]
- Foundation of Science and Technology/Ministry of Science, Technology and Higher Education [UID/FIS/04434/2019]
- European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant [664931]
- grant FPI-SO from the Spanish Ministry of Economy and Competitiveness (MINECO) [SEV-2015-0548-17-2, BES-2017-082610]
- NASA [NNX16AI09G]
- NSF [AST-1514676, AST-1824644]
- NASA through Caltech/JPL grant [RSA-1610091]
- MIT's Kavli Institute
- NASA through the TESS Guest Investigator program [80NSSC19K0385]
- Erciyes University Scientific Research Projects Coordination Unit [MAP-2020-9749]
- Independent Research Fund Denmark [7027-00096B]
- Carlsberg Foundation [CF19-0649]
- Office Of Internatl Science &Engineering
- Office Of The Director [1559487] Funding Source: National Science Foundation
TOI-257b is a warm sub-Saturn discovered orbiting a slightly evolved F-type star, with characteristics of a planet mass of 0.138M(J) and a radius of 0.639R-J. Stellar asteroseismology data suggests the presence of a second non-transiting sub-Saturn mass planet in the system.
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 M-P = 0.138 +/- 0.023M(J) (43.9 +/- 7.3 M-circle plus), a radius of R-P = 0.639 +/- 0.013 R-J (7.16 +/- 0.15 R-circle plus), bulk density of 0.65(-0.11)(+0.12) (cgs), and period 18.38818(-0.00084)(+0.00085) days. TOI-257b orbits a bright (V = 7.612 mag) somewhat evolved late F-type star with M-* = 1.390 +/- 0.046(Msun), R-* = 1.888 +/- 0.033 R-sun, T-eff = 6075 +/- 90 K, and vsin i = 11.3 +/- 0.5 kms(-1). Additionally, we find hints for a second non-transiting sub-Saturn mass planet on a similar to 71 day orbit using the radial velocity data. This system joins the ranks of a small number of exoplanet host stars (similar to 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.
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