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TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type starWe 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 ± 0.023 M(J) (43.9 ± 7.3 Mꚛ), a radius of R(P) = 0.639 ± 0.013 R(J) (7.16 ± 0.15 Rꚛ⁠), 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 M(sun)⁠, R⁎ = 1.888 ± 0.033 R(sun)⁠, T(eff) = 6075 ± 90 K⁠, and 𝜈sin  𝑖 = 11.3 ± 0.5 km/s. 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.
Document ID
20210015041
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
Authors
Brett C. Addison ORCID
(University of Southern Queensland Toowoomba, Queensland, Australia)
Duncan J. Wright ORCID
(University of Southern Queensland Toowoomba, Queensland, Australia)
Belinda A. Nicholson
(University of Oxford Oxford, Oxfordshire, United Kingdom)
Bryson Cale
(George Mason University Fairfax, Virginia, United States)
Teo Mocnik
(University of California, Riverside Riverside, California, United States)
Daniel Huber
(University of Hawaii at Manoa Honolulu, Hawaii, United States)
Peter Plavchan ORCID
(George Mason University Fairfax, Virginia, United States)
Robert A. Wittenmyer
(University of Southern Queensland Toowoomba, Queensland, Australia)
Andrew Vanderburg
(University of Wisconsin–Madison Madison, Wisconsin, United States)
William J. Chaplin
(University of Birmingham Birmingham, United Kingdom)
Ashley Chontos ORCID
(University of Hawaii at Manoa Honolulu, Hawaii, United States)
Jake T. Clark
(University of Southern Queensland Toowoomba, Queensland, Australia)
Jason D. Eastman ORCID
(Harvard-Smithsonian Center for Astrophysics Cambridge, Massachusetts, United States)
Carl Ziegler ORCID
(University of Toronto Toronto, Ontario, Canada)
Rafael Brahm
(Adolfo Ibáñez University Santiago, Chile)
Bradley D. Carter
(University of Southern Queensland Toowoomba, Queensland, Australia)
Mathieu Clerte
(University of Southern Queensland Toowoomba, Queensland, Australia)
Nestor Espinoza
(Space Telescope Science Institute Baltimore, Maryland, United States)
Jonathan Horner
(University of Southern Queensland Toowoomba, Queensland, Australia)
John Bentley
(UNSW Sydney Sydney, New South Wales, Australia)
Andres Jordan
(Adolfo Ibáñez University Santiago, Chile)
Stephen R. Kane
(University of California, Riverside Riverside, California, United States)
John F. Kielkopf
(University of Louisville Louisville, Kentucky, United States)
Emilie Laychock
(Kutztown University Kutztown, Pennsylvania, United States)
Matthew W. Mengel
(University of Southern Queensland Toowoomba, Queensland, Australia)
Jack Okumura
(University of Southern Queensland Toowoomba, Queensland, Australia)
Keivan G. Stassun ORCID
(Vanderbilt University Nashville, Tennessee, United States)
Timothy R. Bedding
(University of Sydney Sydney, New South Wales, Australia)
Brendan P. Bowler
(The University of Texas at Austin Austin, Texas, United States)
Andrius Burnelis
(Westminster College - Pennsylvania New Wilmington, Pennsylvania, United States)
Sergi Blanco-Cuaresma
(Harvard-Smithsonian Center for Astrophysics Cambridge, Massachusetts, United States)
Michaela Collins
(Kutztown University Kutztown, Pennsylvania, United States)
Ian Crossfield
(University of Kansas Lawrence, Kansas, United States)
Allen B. Davis
(Yale University New Haven, Connecticut, United States)
Dag Evensberget
(University of Southern Queensland Toowoomba, Queensland, Australia)
Alexis Heitzmann
(University of Southern Queensland Toowoomba, Queensland, Australia)
Steve B. Howell ORCID
(Ames Research Center Mountain View, California, United States)
Nicholas Law
(University of North Carolina at Chapel Hill Chapel Hill, North Carolina, United States)
Andrew W. Mann
(University of North Carolina at Chapel Hill Chapel Hill, North Carolina, United States)
Stephen C. Marsden
(University of Southern Queensland Toowoomba, Queensland, Australia)
Rachel A. Matson ORCID
(United States Naval Observatory Washington D.C., District of Columbia, United States)
James H. O’Connor
(University of Southern Queensland Toowoomba, Queensland, Australia)
Avi Shporer
(Massachusetts Institute of Technology Cambridge, Massachusetts, United States)
Catherine Stevens
(Westminster College - Pennsylvania New Wilmington, Pennsylvania, United States)
C. G. Tinney
(UNSW Sydney Sydney, New South Wales, Australia)
Christopher Tylor
(University of Southern Queensland Toowoomba, Queensland, Australia)
Songhu Wang
(Indiana University Bloomington Bloomington, Indiana, United States)
Hui Zhang
(Nanjing University Nanjing, China)
Thomas Henning
(Max Planck Institute for Astronomy Heidelberg, Germany)
Diana Kossakowski
(Max Planck Institute for Astronomy Heidelberg, Germany)
George Ricker
(Massachusetts Institute of Technology Cambridge, Massachusetts, United States)
Paula Sarkis
(Max Planck Institute for Astronomy Heidelberg, Germany)
Martin Schlecker
(Max Planck Institute for Astronomy Heidelberg, Germany)
Pascal Torres
(Pontifical Catholic University of Chile Santiago, Región Metropolitana de Santiago, Chile)
Roland Vanderspek
(Massachusetts Institute of Technology Cambridge, Massachusetts, United States)
David W. Latham
(Harvard-Smithsonian Center for Astrophysics Cambridge, Massachusetts, United States)
Sara Seager
(Massachusetts Institute of Technology Cambridge, Massachusetts, United States)
Joshua N. Winn
(Princeton University Princeton, New Jersey, United States)
Jon M. Jenkins
(Search for Extraterrestrial Intelligence Mountain View, California, United States)
Ismael Mireles
(Massachusetts Institute of Technology Cambridge, Massachusetts, United States)
Pam Rowden
(The Open University Milton Keynes, United Kingdom)
Joshua Pepper ORCID
(Lehigh University Bethlehem, Pennsylvania, United States)
Tansu Daylan
(Massachusetts Institute of Technology Cambridge, Massachusetts, United States)
Joshua E. Schlieder
(Goddard Space Flight Center Greenbelt, Maryland, United States)
Karen A. Collins
(Harvard-Smithsonian Center for Astrophysics Cambridge, Massachusetts, United States)
Kevin I. Collins ORCID
(George Mason University Fairfax, Virginia, United States)
Thiam-Guan Tan ORCID
(Perth Exoplanet Survey Telescope Observatory Perth, Western Australia, Australia)
Warrick H. Ball
(University of Birmingham Birmingham, United Kingdom)
Sarbani Basu
(Yale University New Haven, Connecticut, United States)
Derek L. Buzasi
(Florida Gulf Coast University Fort Myers, Florida, United States)
Tiago L. Campante
(Lusíada University of Porto Porto, Portugal)
Enrico Corsaro
(Osservatorio Astrofisico di Catania Catania, Italy)
L. Gonz´alez-Cuesta
(Instituto de Astrofísica de Canarias Santa Cruz de Tenerife, Spain)
Guy R. Davies
(University of Birmingham Birmingham, United Kingdom)
Leandro de Almeida
(Federal University of Rio Grande do Norte Natal, Brazil)
Jose-Dias do Nascimento Jr.
(Federal University of Rio Grande do Norte Natal, Brazil)
Rafael A. Garcpıa
(University of Paris-Saclay Gif-sur-Yvette, France)
Zhao Guo
(Pennsylvania State University State College, Pennsylvania, United States)
Rasmus Handberg
(Aarhus University Aarhus, Denmark)
Saskia Hekker
(Heidelberg University Heidelberg, Germany)
Daniel R. Hey
(University of Sydney Sydney, New South Wales, Australia)
Thomas Kallinger
(University of Vienna Vienna, Austria)
Steven D. Kawaler
(Iowa State University Ames, Iowa, United States)
Cenk Kayhan
(Erciyes University Kayseri, Turkey)
James S. Kuszlewicz
(Max Planck Institute for Solar System Research Göttingen, Germany)
Mikkel N. Lund
(Aarhus University Aarhus, Denmark)
Alexander Lyttle
(University of Birmingham Birmingham, United Kingdom)
Savita Mathur
(Instituto de Astrofísica de Canarias Santa Cruz de Tenerife, Spain)
Andrea Miglio
(University of Birmingham Birmingham, United Kingdom)
Benoit Mosser
(Laboratory of Space Studies and Instrumentation in Astrophysics Meudon, France)
Martin B. Nielsen
(University of Birmingham Birmingham, United Kingdom)
Aldo M. Serenelli
(Institute of Space Sciences Barcelona, Spain)
Victor Silva Aguirre
(Aarhus University Aarhus, Denmark)
Nathalie Themeßl
(Max Planck Institute for Solar System Research Göttingen, Germany)
Date Acquired
May 3, 2021
Publication Date
December 28, 2020
Publication Information
Publication: Monthly Notices of the Royal Astronomical Society
Publisher: Royal Astronomical Society / Oxford University Press
Volume: 502
Issue: 3
Issue Publication Date: April 1, 2021
ISSN: 0035-8711
e-ISSN: 1365-2966
URL: https://academic.oup.com/mnras/article-abstract/502/3/3704/6054535?redirectedFrom=fulltext
Subject Category
Astrophysics
Funding Number(s)
WBS: 527813.02.01.01.16.01
CONTRACT_GRANT: AST-1909209
CONTRACT_GRANT: 80NSSC18K1585
CONTRACT_GRANT: AST-1717000
CONTRACT_GRANT: DGE 1842402
CONTRACT_GRANT: AST-1514676
CONTRACT_GRANT: AST-1824644
CONTRACT_GRANT: RSA-1610091
CONTRACT_GRANT: NNX16AI09G
CONTRACT_GRANT: 80NSSC19K0385
CONTRACT_GRANT: NSF 1559487
Distribution Limits
Public
Copyright
Portions of document may include copyright protected material.
Technical Review
Single Expert
Keywords
asteroseismology
techniques: photometric
techniques: radial velocities
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