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A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS
Authors
Alan M. Levine
Aldo M. Serenelli
+228 more
Alexandra Thomas
Alfio Bonanno
Allyson Bieryla
Amalie Stokholm
Amir Hasanzadeh
Andrea Miglio
Andrew W. Howard
Andrew W. Mann
Andrés Jordán
Angelle Tanner
Anthony Noll
Anwesh Mazumdar
Ashley Chontos
Astropy Collaboration
Aylin Garcia Soto
Baglin A.
Ballard S.
Barclay T.
Barry Smalley
Basu S.
Bedding T. R.
Bedding T. R. ed Shibahashi H.
Benard Nsamba
Benjamin Fulton
Benoit Mosser
Berger T. A.
Bodenheimer P.
Bovy J.
Brahm R.
Brahm R.
Brendan Orenstein
Bryson Cale
C. G. Tinney
Campante T. L.
Campante T. L.
Chaplin W. J.
Charles Beichmann
Chen J.
Chen Jiang
Chloe Schnaible
Choi J.
Chontos A.
Christoph Bergmann
Ciardi D. R.
Clara Régulo
Cunha M. S.
Daniel Huber
Danny LeBrun
David Baker
David R. Ciardi
David R. Soderblom
David W. Latham
Demory B.-O.
Dennis Stello
Derek L. Buzasi
Duncan Wright
Eastman J.
Eastman J.
Emil Knudstrup
Emma Page
Enrico Corsaro
Eric Gaidos
Eva Natinsky
Farzaneh Zohrabi
Filipe Pereira
Frank Giddens
Frank Grundahl
Furlan E.
Fürész G.
Gabor Fürész
George R. Ricker
Gilliland R. L.
Grunblatt S. K.
Grunblatt S. K.
Grunblatt S. K.
Grundahl F.
Guy R. Davies
H. M. Antia
Hans Kjeldsen
Howard T. Isaacson
Huber D.
Huber D.
Huber D.
Høg E.
Ian Crossfield
Ian W. Roxburgh
Jakob Rørsted Mosumgaard
James S. Kuszlewicz
Jamie Tayar
Jason A. Dittmann
Jennifer L. van Saders
Jessie L. Christiansen
Jia Mian Joel Ong
Johanna Teske
Johnson J. A.
Johnson J. A.
Jon M. Jenkins
Jonathan Gagné
Jose-Dias Do Nascimento
Joshua N. Winn
Joyce A. Guzik
Jørgen Christensen-Dalsgaard
Kaufer A.
Keaton J. Bell
Keivan G. Stassun
Kjeldsen H.
Kjeldsen H.
Kjeldsen H.
Kjeldsen H.
Kosmas Gazeas
Kovács G.
Kuldeep Verma
Lars A. Buchhave
Lauren M. Weiss
Lisa Bugnet
Lopez E. D.
Lund M. N.
Lundkvist M. S.
Léo Girardi
M. Yıldız
Mads Fredslund Andersen
Mann A. W.
Marc Hon
Margarida S. Cunha
Maria Pia Di Mauro
Martin Paegert
Masoud Mansouri-Samani
Mathew Schofield
Mathieu Vrard
Mathur S.
Mayor M.
Mia S. Lundkvist
Michael J. Ireland
Michaël Bazot
Mikkel N. Lund
Miles Lucas
Miller N.
Mário J. P. F. G. Monteiro
Natasha Latouf
Nestor Espinoza
Oliver J. Hall
Ong J. M. J.
Orlagh Creevey
Othman Benomar
Patrick Gaulme
Paula Sarkis
Paxton B.
Paxton B.
Paxton B.
Pere L. Pallé
Peter Gao
Peter Plavchan
Petigura E.
Petigura E. A.
Petigura E. A.
Pritesh Ranadive
Queloz D.
Quinn S. N.
Rafael A. García
Rafael Brahm
Rasmus Handberg
Regner Trampedach
Roberto Carlino
Roland K. Vanderspek
Róbert Szabó
S. Örtel
Samuel K. Grunblatt
Samuel N. Quinn
Sara Seager
Sarbani Basu
Saskia Hekker
Savita Mathur
Schlaufman K. C.
Schlegel D. J.
Schofield M.
Scott M. Cartwright
Sean McCauliff
Sebastien Deheuvels
Serenelli A.
Simon Albrecht
Skrutskie M. F.
Sliski D. H.
Smith J. C.
Sousa S. G. ed Niemczura E.
Stassun K. G.
Stassun K. G.
Stassun K. G.
Stello D.
Stephan A. P.
Steven D. Kawaler
Stumpe M. C.
Stéphane Mathis
Susan E. Mullally
Sérgio G. Sousa
Tanda Li
Tayar J.
Tayar J.
Teruyuki Hirano
Thaíse S. Rodrigues
Thierry Appourchaux
Thomas Henning
Thomas Kallinger
Thomas T. Yuan
Thorngren D. P.
Tiago L. Campante
Timothy R. Bedding
Timothy R. White
Tokovinin A.
Torres G.
Travis S. Metcalfe
Van Eylen V.
Van Eylen V.
van Saders J. L.
Victor Silva Aguirre
Villaver E.
Vincent Van Eylen
Wang S.
Warrick Ball
Weiss L. M.
Weiss W. W.
White T. R.
William J. Chaplin
William Matzko
Wittenmyer R. A.
Wizinowich P.
Wright E. L.
Yveline Lebreton
Z. Çelik Orhan
Publication date
1 January 2019
Publisher
'American Astronomical Society'
Doi
Cite
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on
arXiv
Abstract
© 2019. The American Astronomical Society. All rights reserved.. We present the discovery of HD 221416 b, the first transiting planet identified by the Transiting Exoplanet Survey Satellite (TESS) for which asteroseismology of the host star is possible. HD 221416 b (HIP 116158, TOI-197) is a bright (V = 8.2 mag), spectroscopically classified subgiant that oscillates with an average frequency of about 430 μHz and displays a clear signature of mixed modes. The oscillation amplitude confirms that the redder TESS bandpass compared to Kepler has a small effect on the oscillations, supporting the expected yield of thousands of solar-like oscillators with TESS 2 minute cadence observations. Asteroseismic modeling yields a robust determination of the host star radius (R∗ = 2.943 ± 0.064 Ro), mass (M∗ = 1.212 ± 0.074 Mo), and age (4.9 ± 1.1 Gyr), and demonstrates that it has just started ascending the red-giant branch. Combining asteroseismology with transit modeling and radial-velocity observations, we show that the planet is a "hot Saturn" (Rp = 9.17 ± 0.33 R⊕) with an orbital period of ∼14.3 days, irradiance of F = 343 ± 24 F⊕, and moderate mass (Mp = 60.5 ± 5.7 M⊕) and density (ρp = 0.431 ± 0.062 g cm-3). The properties of HD 221416 b show that the host-star metallicity-planet mass correlation found in sub-Saturns (4-8 R⊕) does not extend to larger radii, indicating that planets in the transition between sub-Saturns and Jupiters follow a relatively narrow range of densities. With a density measured to ∼15%, HD 221416 b is one of the best characterized Saturn-size planets to date, augmenting the small number of known transiting planets around evolved stars and demonstrating the power of TESS to characterize exoplanets and their host stars using asteroseismology
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