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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2021

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 , Néstor Espinoza , Jonathan Horner , John Bentley , Andrés Jordán , 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 I. Collins , Thiam-Guan Tan , Warrick H. Ball , Sarbani Basu , Derek L. Buzasi , Tiago L. Campante , Enrico Corsaro , L. González-Cuesta , Guy R. Davies , Leandro de Almeida , Jose-Dias Do Nascimento , Rafael A. García , 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 (1) , Martin B. Nielsen , Aldo M. Serenelli , Victor Silva Aguirre , Nathalie Themeßl
Brett C. Addison
  • Function : Author
Duncan J. Wright
  • Function : Author
Belinda A. Nicholson
  • Function : Author
Bryson Cale
  • Function : Author
Teo Mocnik
  • Function : Author
Daniel Huber
  • Function : Author
Peter Plavchan
  • Function : Author
Robert A. Wittenmyer
  • Function : Author
Andrew Vanderburg
  • Function : Author
William J. Chaplin
  • Function : Author
Ashley Chontos
  • Function : Author
Jake T. Clark
  • Function : Author
Jason D. Eastman
  • Function : Author
Carl Ziegler
  • Function : Author
Rafael Brahm
  • Function : Author
Bradley D. Carter
  • Function : Author
Mathieu Clerte
  • Function : Author
Néstor Espinoza
  • Function : Author
Jonathan Horner
  • Function : Author
John Bentley
  • Function : Author
Andrés Jordán
  • Function : Author
Stephen R. Kane
  • Function : Author
John F. Kielkopf
  • Function : Author
Emilie Laychock
  • Function : Author
Matthew W. Mengel
  • Function : Author
Jack Okumura
  • Function : Author
Keivan G. Stassun
  • Function : Author
Timothy R. Bedding
  • Function : Author
Brendan P. Bowler
  • Function : Author
Andrius Burnelis
  • Function : Author
Sergi Blanco-Cuaresma
  • Function : Author
Michaela Collins
  • Function : Author
Ian Crossfield
  • Function : Author
Allen B. Davis
  • Function : Author
Dag Evensberget
  • Function : Author
Alexis Heitzmann
  • Function : Author
Steve B. Howell
  • Function : Author
Nicholas Law
  • Function : Author
Andrew W. Mann
  • Function : Author
Stephen C. Marsden
  • Function : Author
Rachel A. Matson
  • Function : Author
James H. O'Connor
  • Function : Author
Avi Shporer
  • Function : Author
Catherine Stevens
  • Function : Author
C. G. Tinney
  • Function : Author
Christopher Tylor
  • Function : Author
Songhu Wang
  • Function : Author
Hui Zhang
  • Function : Author
Thomas Henning
  • Function : Author
Diana Kossakowski
  • Function : Author
George Ricker
  • Function : Author
Paula Sarkis
  • Function : Author
Martin Schlecker
  • Function : Author
Pascal Torres
  • Function : Author
Roland Vanderspek
  • Function : Author
David W. Latham
  • Function : Author
Sara Seager
  • Function : Author
Joshua N. Winn
  • Function : Author
Jon M. Jenkins
  • Function : Author
Ismael Mireles
  • Function : Author
Pam Rowden
  • Function : Author
Joshua Pepper
  • Function : Author
Tansu Daylan
  • Function : Author
Joshua E. Schlieder
  • Function : Author
Karen A. Collins
  • Function : Author
Kevin I. Collins
  • Function : Author
Thiam-Guan Tan
  • Function : Author
Warrick H. Ball
  • Function : Author
Sarbani Basu
  • Function : Author
Derek L. Buzasi
  • Function : Author
Tiago L. Campante
  • Function : Author
Enrico Corsaro
  • Function : Author
L. González-Cuesta
  • Function : Author
Guy R. Davies
  • Function : Author
Leandro de Almeida
  • Function : Author
Jose-Dias Do Nascimento
  • Function : Author
Rafael A. García
  • Function : Author
Zhao Guo
  • Function : Author
Rasmus Handberg
  • Function : Author
Saskia Hekker
  • Function : Author
Daniel R. Hey
  • Function : Author
Thomas Kallinger
  • Function : Author
Steven D. Kawaler
  • Function : Author
Cenk Kayhan
  • Function : Author
James S. Kuszlewicz
  • Function : Author
Mikkel N. Lund
  • Function : Author
Alexander Lyttle
  • Function : Author
Savita Mathur
  • Function : Author
Andrea Miglio
  • Function : Author
Martin B. Nielsen
  • Function : Author
Aldo M. Serenelli
  • Function : Author
Victor Silva Aguirre
  • Function : Author
Nathalie Themeßl
  • Function : Author

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 $\rm {M_J}$ (43.9 ± 7.3 $\, M_{\rm \oplus}$ ), a radius of RP = 0.639 ± 0.013 $\rm {R_J}$ (7.16 ± 0.15 $\, \mathrm{ R}_{\rm \oplus}$ ), bulk density of $0.65^{+0.12}_{-0.11}$ (cgs), and period $18.38818^{+0.00085}_{-0.00084}$ $\rm {days}$ . 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 $\rm {R_{sun}}$ , 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.
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Dates and versions

insu-03713781 , version 1 (14-04-2023)

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Brett C. Addison, Duncan J. Wright, Belinda A. Nicholson, Bryson Cale, Teo Mocnik, et al.. TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star. Monthly Notices of the Royal Astronomical Society, 2021, 502, pp.3704-3722. ⟨10.1093/mnras/staa3960⟩. ⟨insu-03713781⟩
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