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TOI-257b (HD 19916b): A Warm sub-Saturn on a Moderately Eccentric Orbit Around 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
; Stephen R. Kane
; John F. Kielkopf
; Emilie Laychock
; Matthew W. Mengel
; Jack Okumura
; Keivan G. Stassun
; Timothy R. Bedding
; Brendan P. Bowler
; Andrius Burnelis
; Michaela Collins
; Ian Crossfield
; Allen B. Davis
; Dag Evensberget
; Alexis Heitzmann
; Steve B. Howell
; Nicholas Law
; Andrew W. Mann
; Stephen Marsden
; James O'Connor
; Avi Shporer
; Catherine Stevens
; C.G. Tinney
; Christopher Tylor
; Songhu Wang
; Hui Zhang
; Thomas Henning
; Diana Kossakowski
; George Ricker
; Paula Sarkis
; 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
; Lucía González-Cuesta
; Guy R. Davies
; Rafael ~A.~Garcí a
; 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
; | | Date: |
21 Jan 2020 | | 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 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}$$
m{M_J}$
($42.6^{+7.3}_{-7.0}$$
m{M_{oplus}}$), a radius of
$R_P=0.626^{+0.013}_{-0.012}$$
m{R_J}$
($7.02^{+0.15}_{-0.13}$$
m{R_{oplus}}$), and an orbit with eccentricity
$0.242^{+0.040}_{-0.065}$ and period $18.38827pm0.00072$$
m{days}$. TOI-257b
orbits a bright ($mathrm{V}=7.570$mag) somewhat evolved late F-type star with
$M_*=1.390pm0.046$$
m{M_{odot}}$, $R_*=1.888pm0.033$$
m{R_{odot}}$,
$T_{
m eff}=6075pm90$$
m{K}$, and $vsin{i}=11.3pm0.5$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. | | Source: | arXiv, 2001.7345 | | Services: | Forum | Review | PDF | Favorites | |
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