TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star

Brett C Addison; Duncan J Wright; Belinda A Nicholson; Bryson Cale; Teo Mocnik; Daniel Huber; Peter Plavchan; Robert A Wittenmyer; Andrew Vanderburg; William J Chaplin; Ashley Chontos; Jake T Clark; Jason D Eastman; Carl Ziegler; Rafael Brahm; Bradley D Carter; Mathieu Clerte; Nestor Espinoza; Jonathan Horner; John Bentley; Andres Jordan; Stephen R Kane; John F Kielkopf; Emilie Laychock; Matthew W Mengel; Jack Okumura; Keivan G Stassun; Timothy R Bedding; Brendan P Bowler; Andrius Burnelis; Sergi Blanco-Cuaresma; Michaela Collins; Ian Crossfield; Allen B Davis; Dag Evensberget; Alexis Heitzmann; Steve B Howell; Nicholas Law; Andrew W Mann; Stephen C Marsden; Rachel A Matson; James H O'Connor; Avi Shporer; Catherine Stevens; C. G Tinney; Christopher Tylor; Songhu Wang; Hui Zhang; Thomas Henning; Diana Kossakowski; George Ricker; Paula Sarkis; Martin Schlecker; Pascal Torres; Roland Vanderspek; David W Latham; Sara Seager; Joshua N Winn; Jon M Jenkins; Ismael Mireles; Pam Rowden; Joshua Pepper; Tansu Daylan; Joshua E Schlieder; Karen A Collins; Kevin Collins; Thiam-Guan Tan; Warrick H Ball; Sarbani Basu; Derek L Buzasi; Tiago L Campante; Enrico Corsaro; L Gonzalez-Cuesta; Guy R Davies; Leandro de Almeida; Jose-Dias do Nascimento; Rafael A Garcia; Zhao Guo; Rasmus Handberg; Saskia Hekker; Daniel R Hey; Thomas Kallinger; Steven D Kawaler; Cenk Kayhan; James S. Kuszlewicz; Mikkel N Lund; Alexander Lyttle; Savita Mathur; Andrea Miglio; Benoit Mosser; Martin B Nielsen; Aldo M Serenelli; Victor Silva Aguirre; Nathalie Themessl

doi:10.1093/mnras/staa3960

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TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star

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TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star

Brett C Addison, Duncan J Wright, Belinda A Nicholson, Bryson Cale, Teo Mocnik, Daniel Huber, Peter Plavchan, Robert A Wittenmyer, Andrew Vanderburg, William J Chaplin, …

Monthly notices of the Royal Astronomical Society, Vol.502(3), pp.3704-3722

02-19-2021

DOI: https://doi.org/10.1093/mnras/staa3960

Abstract

Astronomy & Astrophysics

Physical Sciences

Science & Technology

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-star = 1.390 +/- 0.046Msun, R-star = 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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Title: TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star
Creators: Brett C Addison - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Duncan J Wright - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Belinda A Nicholson - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Bryson Cale - George Mason University
Teo Mocnik - Riverside
Daniel Huber - Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA
Peter Plavchan - George Mason University
Robert A Wittenmyer - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Andrew Vanderburg - Univ Wisconsin Madison, Dept Astron, Madison, WI 53706 USA
William J Chaplin - Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands B15 2TT, England
Ashley Chontos - Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA
Jake T Clark - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Jason D Eastman - Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA
Carl Ziegler - Univ Toronto, Dunlap Inst Astron & Astrophys, 50 St George St, Toronto, ON M5S 3H4, Canada
Rafael Brahm - AVE (Czechia)
Bradley D Carter - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Mathieu Clerte - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Nestor Espinoza - Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA
Jonathan Horner - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
John Bentley - UNSW, Sch Phys, Exoplanetary Sci, Sydney, NSW 2052, Australia
Andres Jordan - Millennium Institute
Stephen R Kane - Riverside
John F Kielkopf - Univ Louisville, Dept Phys & Astron, Louisville, KY 40292 USA
Emilie Laychock - Kutztown State Univ, Dept Phys Sci, Kutztown, PA 19530 USA
Matthew W Mengel - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Jack Okumura - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Keivan G Stassun - Vanderbilt University
Timothy R Bedding - Aarhus University
Brendan P Bowler - Univ Texas Austin, Dept Astron, Austin, TX 78712 USA
Andrius Burnelis - Westminster Coll, Dept Phys, 319 SouthMarket St, New Wilmington, PA 16172 USA
Sergi Blanco-Cuaresma - Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA
Michaela Collins - Kutztown State Univ, Dept Phys Sci, Kutztown, PA 19530 USA
Ian Crossfield - Univ Kansas, Dept Phys & Astron, 1251 Wescoe Hall Dr, Lawrence, KS 66045 USA
Allen B Davis - Yale University
Dag Evensberget - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Alexis Heitzmann - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Steve B Howell - AMES (Slovenia)
Nicholas Law - Univ North Carolina Chapel Hill, Dept Phys & Astron, Chapel Hill, NC 27599 USA
Andrew W Mann - Univ North Carolina Chapel Hill, Dept Phys & Astron, Chapel Hill, NC 27599 USA
Stephen C Marsden - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Rachel A Matson - AVE (Czechia)
James H O'Connor - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Avi Shporer - MIT, MIT Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
Catherine Stevens - Westminster Coll, Dept Phys, 319 SouthMarket St, New Wilmington, PA 16172 USA
C. G Tinney - UNSW, Sch Phys, Exoplanetary Sci, Sydney, NSW 2052, Australia
Christopher Tylor - Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia
Songhu Wang - Indiana University Bloomington
Hui Zhang - Nanjing University
Thomas Henning - Heidelberg (Poland)
Diana Kossakowski - Heidelberg (Poland)
George Ricker - MIT, MIT Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
Paula Sarkis - Heidelberg (Poland)
Martin Schlecker - Heidelberg (Poland)
Pascal Torres - AVE (Czechia)
Roland Vanderspek - MIT, MIT Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
David W Latham - Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA
Sara Seager - MIT, MIT Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
Joshua N Winn - Princeton University
Jon M Jenkins - AMES (Slovenia)
Ismael Mireles - MIT, MIT Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
Pam Rowden - Open Univ, Sch Phys Sci, Milton Keynes, Bucks MK7 6AA, England
Joshua Pepper - Lehigh University
Tansu Daylan - MIT, MIT Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
Joshua E Schlieder - NASA Goddard Space Flight Ctr, Exoplanets & Stellar Astrophys Lab, Mail Code 667, Greenbelt, MD 20771 USA
Karen A Collins - Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA
Kevin Collins - George Mason University
Thiam-Guan Tan - Perth Exoplanet Survey Telescope, Perth, WA, Australia
Warrick H Ball - Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands B15 2TT, England
Sarbani Basu - Yale University
Derek L Buzasi - Florida Gulf Coast University
Tiago L Campante - Univ Porto, CAUP, Inst Astrofis & Ciencias Espaco, Rua Estrelas, P-4150762 Porto, Portugal
Enrico Corsaro - INAF, Osserv Astrofisico Catania, Via S Sofia 78, I-95123 Catania, Italy
L Gonzalez-Cuesta - IAC (United States)
Guy R Davies - Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands B15 2TT, England
Leandro de Almeida - Univ Fed Rio Grande Norte UFRN, Dept Fis, BR-59078970 Natal, RN, Brazil
Jose-Dias do Nascimento - Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA
Rafael A Garcia - CEA, Univ Paris Saclay, IRFU, F-91191 Gif Sur Yvette, France
Zhao Guo - Penn State Univ, Ctr Exoplanets & Habitable Worlds, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA
Rasmus Handberg - Aarhus University
Saskia Hekker - Aarhus University
Daniel R Hey - Aarhus University
Thomas Kallinger - Univ Vienna, Inst Astrophys, A-1180 Vienna, Austria
Steven D Kawaler - Iowa State University
Cenk Kayhan - Erciyes University
James S. Kuszlewicz - Aarhus University
Mikkel N Lund - Aarhus University
Alexander Lyttle - Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands B15 2TT, England
Savita Mathur - IAC (United States)
Andrea Miglio - Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands B15 2TT, England
Benoit Mosser - Sorbonne Université
Martin B Nielsen - Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands B15 2TT, England
Aldo M Serenelli - S&N (Germany)
Victor Silva Aguirre - Aarhus University
Nathalie Themessl - Aarhus University
Publication Details: Monthly notices of the Royal Astronomical Society, Vol.502(3), pp.3704-3722
Publisher: Oxford Univ Press; OXFORD
Number of pages: 19
Grant note: LE160100001; DP180100972 / Australian Research Council; Australian Research Council NASA Exoplanet Exploration Program 772293 / European Research Council Consolidator Grant funding scheme (project ASTEROCHRONOMETRY) SEV-2015-0548-17-2; BES-2017-082610 / FPI-SO from the Spanish Ministry of Economy and Competitiveness (MINECO) National Aeronautics and Space Administration; National Aeronautics & Space Administration (NASA) 80NSSC18K1585 / National Aeronautics and Space Administration through the TESS Guest Investigator Program 2017-SGR-1131 / Generalitat de Catalunya; Generalitat de Catalunya; General Electric CF19-0649 / Carlsberg Foundation; Carlsberg Foundation University of Texas at Austin Massachusetts Institute of Technology 11673011; 11933001 / Natural Science Foundation of China (NSFC); National Natural Science Foundation of China (NSFC) DNRF106 / DanishNationalResearch Foundation; Danmarks Grundforskningsfond MIT's Kavli Institute PLAnetary Transits and Oscillations of stars grant from the Centre National d' 'Etudes Spatiales UK Space Agency Mount Cuba Astronomical Foundation University of Florida; University of Florida AST-1824644; AST-1514676 / NSF; National Science Foundation (NSF) MAP-2020-9749 / Erciyes University Scientific Research Projects Coordination Unit; Erciyes University 3180246 / National Fund for Scientific and Technological Development; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); CONICYT FONDECYT UID/FIS/04434/2019 / Foundation of Science and Technology/Ministry of Science, Technology and Higher Education 1171208 / FONDECYT; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); CONICYT FONDECYT NNX16AI09G / NASA; National Aeronautics & Space Administration (NASA) George Mason University Millennium Institute of Astrophysics (MAS) NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center RSA-1610091 / NASA through Caltech/JPL grant Science and Technology Facilities Council; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) University of California Riverside; University of California System ESP2017-82674-R / Spanish Government; Spanish Government; European Commission University of New South Wales, Australia RYC-2015-17697 / Ramon y Cajal fellowship; Spanish Government Nanjing University; Nanjing University University of Louisville NASA's ScienceMission Directorate 80NSSC19K0385 / NASA through the TESS Guest Investigator program University of Southern Queensland IC 120009 / Ministry for the Economy, Development, and Tourism's Programa Iniciativa Cientifica Milenio 7027-00096B / Independent Research Fund Denmark 1559487; AST-1909209; DGE 1842402 / National Science Foundation; National Science Foundation (NSF) 664931; 792848 / European Union; European Commission
Identifiers: 99383431839006570
Academic Unit: College of Arts & Sciences
Language: English
Resource Type: Journal article

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TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star

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