TOI-257b (HD 19916b): A Warm sub-Saturn on a Moderately Eccentric Orbit Around an Evolved F-type Star

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  • Brett C. Addison
  • ,
  • Duncan J. Wright
  • ,
  • Belinda A. Nicholson
  • ,
  • Bryson Cale
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  • Teo Mocnik
  • ,
  • Daniel Huber
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  • Peter Plavchan
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  • Robert A. Wittenmyer
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  • Andrew Vanderburg
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  • William J. Chaplin
  • ,
  • Ashley Chontos
  • ,
  • Jake T. Clark
  • ,
  • Jason D. Eastman
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  • Carl Ziegler
  • ,
  • Rafael Brahm
  • ,
  • Bradley D. Carter
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  • Mathieu Clerte
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  • Néstor Espinoza
  • ,
  • Jonathan Horner
  • ,
  • John Bentley
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  • Stephen R. Kane
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  • John F. Kielkopf
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  • Emilie Laychock
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  • Matthew W. Mengel
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  • Jack Okumura
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  • Keivan G. Stassun
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  • Timothy R. Bedding
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  • Brendan P. Bowler
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  • Andrius Burnelis
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  • Michaela Collins
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  • Ian Crossfield
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  • Allen B. Davis
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  • Dag Evensberget
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  • Alexis Heitzmann
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  • Steve B. Howell
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  • Nicholas Law
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  • Andrew W. Mann
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  • Stephen Marsden
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  • James O'Connor
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  • Avi Shporer
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  • Catherine Stevens
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  • C. G. Tinney
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  • Christopher Tylor
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  • Songhu Wang
  • ,
  • Hui Zhang
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  • Thomas Henning
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  • Diana Kossakowski
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  • George Ricker
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  • Paula Sarkis
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  • Roland Vanderspek
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  • David W. Latham
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  • Sara Seager
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  • Joshua N. Winn
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  • Jon M. Jenkins
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  • Ismael Mireles
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  • Pam Rowden
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  • Joshua Pepper
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  • Tansu Daylan
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  • Joshua E. Schlieder
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  • Karen A. Collins
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  • Kevin I. Collins
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  • Thiam-Guan Tan
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  • Warrick H. Ball
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  • Sarbani Basu
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  • Derek L. Buzasi
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  • Tiago L. Campante
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  • Enrico Corsaro
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  • Lucía González-Cuesta
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  • Guy R. Davies
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  • Rafael ~A. ~Garcí a
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  • Zhao Guo
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  • Rasmus Handberg
  • Saskia Hekker
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  • Daniel R. Hey
  • ,
  • Thomas Kallinger
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  • Steven D. Kawaler
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  • Cenk Kayhan
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  • James S. Kuszlewicz
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  • Mikkel N. Lund
  • Alexander Lyttle
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  • Savita Mathur
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  • Andrea Miglio
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  • Benoit Mosser
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  • Martin B. Nielsen
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  • Aldo M. Serenelli
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  • Victor Silva Aguirre
  • Nathalie Themessl
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 with the Minerva-Australis telescope array. 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=0.134^{+0.023}_{-0.022}$$\rm{M_J}$ ($42.6^{+7.3}_{-7.0}$$\rm{M_{\oplus}}$), a radius of $R_P=0.626^{+0.013}_{-0.012}$$\rm{R_J}$ ($7.02^{+0.15}_{-0.13}$$\rm{R_{\oplus}}$), and an orbit with eccentricity $0.242^{+0.040}_{-0.065}$ and period $18.38827\pm0.00072$$\rm{days}$. TOI-257b orbits a bright ($\mathrm{V}=7.570$mag) somewhat evolved late F-type star with $M_*=1.390\pm0.046$$\rm{M_{\odot}}$, $R_*=1.888\pm0.033$$\rm{R_{\odot}}$, $T_{\rm eff}=6075\pm90$$\rm{K}$, and $v\sin{i}=11.3\pm0.5$km/s. Additionally, we statistically validate a second non-transiting sub-Saturn mass planet on a $\sim71$day orbit using the radial velocity data. This system joins the ranks of a small number of exoplanet host stars 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.
OriginalsprogEngelsk
TidsskriftMonthly Notices of the Royal Astronomical Society
ISSN0035-8711
DOI
StatusAccepteret/In press - 21 jan. 2020

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