A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS

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A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS. / Huber, Daniel; Chaplin, William J.; Chontos, Ashley; Kjeldsen, Hans; Christensen-Dalsgaard, Jørgen; Bedding, Timothy R.; Ball, Warrick; Brahm, Rafael; Espinoza, Nestor; Henning, Thomas; Jordán, Andrés; Sarkis, Paula; Knudstrup, Emil; Albrecht, Simon; Grundahl, Frank; Fredslund Andersen, Mads; Pallé, Pere L.; Crossfield, Ian; Fulton, Benjamin; Howard, Andrew W.; Isaacson, Howard T.; Weiss, Lauren M.; Handberg, Rasmus; Lund, Mikkel N.; Serenelli, Aldo M.; Rørsted Mosumgaard, Jakob; Stokholm, Amalie; Bieryla, Allyson; Buchhave, Lars A.; Latham, David W.; Quinn, Samuel N.; Gaidos, Eric; Hirano, Teruyuki; Ricker, George R.; Vanderspek, Roland K.; Seager, Sara; Jenkins, Jon M.; Winn, Joshua N.; Antia, H. M.; Appourchaux, Thierry; Basu, Sarbani; Bell, Keaton J.; Benomar, Othman; Bonanno, Alfio; Buzasi, Derek L.; Campante, Tiago L.; Çelik Orhan, Z.; Corsaro, Enrico; Cunha, Margarida S.; Davies, Guy R.; Deheuvels, Sebastien; Grunblatt, Samuel K.; Hasanzadeh, Amir; Di Mauro, Maria Pia; García, Rafael A.; Gaulme, Patrick; Girardi, Léo; Guzik, Joyce A.; Hon, Marc; Jiang, Chen; Kallinger, Thomas; Kawaler, Steven D.; Kuszlewicz, James S.; Lebreton, Yveline; Li, Tanda; Lucas, Miles; Lundkvist, Mia S.; Mann, Andrew W.; Mathis, Stéphane; Mathur, Savita; Mazumdar, Anwesh; Metcalfe, Travis S.; Miglio, Andrea; Monteiro, Mário J. P. F. G.; Mosser, Benoit; Noll, Anthony; Nsamba, Benard; Ong, Jia Mian Joel; Örtel, S.; Pereira, Filipe; Ranadive, Pritesh; Régulo, Clara; Rodrigues, Thaíse S.; Roxburgh, Ian W.; Silva Aguirre, Victor; Smalley, Barry; Schofield, Mathew; Sousa, Sérgio G.; Stassun, Keivan G.; Stello, Dennis; Tayar, Jamie; White, Timothy R.; Verma, Kuldeep; Vrard, Mathieu; Yıldız, M.; Baker, David; Bazot, Michaël; Beichmann, Charles; Bergmann, Christoph; Bugnet, Lisa; Cale, Bryson; Carlino, Roberto; Cartwright, Scott M.; Christiansen, Jessie L.; Ciardi, David R.; Creevey, Orlagh; Dittmann, Jason A.; Do Nascimento, Jose-Dias, Jr.; Van Eylen, Vincent; Fürész, Gabor; Gagné, Jonathan; Gao, Peter; Gazeas, Kosmas; Giddens, Frank; Hall, Oliver J.; Hekker, Saskia; Ireland, Michael J.; Latouf, Natasha; LeBrun, Danny; Levine, Alan M.; Matzko, William; Natinsky, Eva; Page, Emma; Plavchan, Peter; Mansouri-Samani, Masoud; McCauliff, Sean; Mullally, Susan E.; Orenstein, Brendan; Garcia Soto, Aylin; Paegert, Martin; van Saders, Jennifer L.; Schnaible, Chloe; Soderblom, David R.; Szabó, Róbert; Tanner, Angelle; Tinney, C. G.; Teske, Johanna; Thomas, Alexandra; Trampedach, Regner; Wright, Duncan; Yuan, Thomas T.; Zohrabi, Farzaneh.

I: The Astronomical Journal, Bind 157, Nr. 6, 245, 01.06.2019.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Harvard

Huber, D, Chaplin, WJ, Chontos, A, Kjeldsen, H, Christensen-Dalsgaard, J, Bedding, TR, Ball, W, Brahm, R, Espinoza, N, Henning, T, Jordán, A, Sarkis, P, Knudstrup, E, Albrecht, S, Grundahl, F, Fredslund Andersen, M, Pallé, PL, Crossfield, I, Fulton, B, Howard, AW, Isaacson, HT, Weiss, LM, Handberg, R, Lund, MN, Serenelli, AM, Rørsted Mosumgaard, J, Stokholm, A, Bieryla, A, Buchhave, LA, Latham, DW, Quinn, SN, Gaidos, E, Hirano, T, Ricker, GR, Vanderspek, RK, Seager, S, Jenkins, JM, Winn, JN, Antia, HM, Appourchaux, T, Basu, S, Bell, KJ, Benomar, O, Bonanno, A, Buzasi, DL, Campante, TL, Çelik Orhan, Z, Corsaro, E, Cunha, MS, Davies, GR, Deheuvels, S, Grunblatt, SK, Hasanzadeh, A, Di Mauro, MP, García, RA, Gaulme, P, Girardi, L, Guzik, JA, Hon, M, Jiang, C, Kallinger, T, Kawaler, SD, Kuszlewicz, JS, Lebreton, Y, Li, T, Lucas, M, Lundkvist, MS, Mann, AW, Mathis, S, Mathur, S, Mazumdar, A, Metcalfe, TS, Miglio, A, Monteiro, MJPFG, Mosser, B, Noll, A, Nsamba, B, Ong, JMJ, Örtel, S, Pereira, F, Ranadive, P, Régulo, C, Rodrigues, TS, Roxburgh, IW, Silva Aguirre, V, Smalley, B, Schofield, M, Sousa, SG, Stassun, KG, Stello, D, Tayar, J, White, TR, Verma, K, Vrard, M, Yıldız, M, Baker, D, Bazot, M, Beichmann, C, Bergmann, C, Bugnet, L, Cale, B, Carlino, R, Cartwright, SM, Christiansen, JL, Ciardi, DR, Creevey, O, Dittmann, JA, Do Nascimento, J-DJ, Van Eylen, V, Fürész, G, Gagné, J, Gao, P, Gazeas, K, Giddens, F, Hall, OJ, Hekker, S, Ireland, MJ, Latouf, N, LeBrun, D, Levine, AM, Matzko, W, Natinsky, E, Page, E, Plavchan, P, Mansouri-Samani, M, McCauliff, S, Mullally, SE, Orenstein, B, Garcia Soto, A, Paegert, M, van Saders, JL, Schnaible, C, Soderblom, DR, Szabó, R, Tanner, A, Tinney, CG, Teske, J, Thomas, A, Trampedach, R, Wright, D, Yuan, TT & Zohrabi, F 2019, 'A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS', The Astronomical Journal, bind 157, nr. 6, 245. https://doi.org/10.3847/1538-3881/ab1488

APA

Huber, D., Chaplin, W. J., Chontos, A., Kjeldsen, H., Christensen-Dalsgaard, J., Bedding, T. R., ... Zohrabi, F. (2019). A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS. The Astronomical Journal, 157(6), [245]. https://doi.org/10.3847/1538-3881/ab1488

CBE

Huber D, Chaplin WJ, Chontos A, Kjeldsen H, Christensen-Dalsgaard J, Bedding TR, Ball W, Brahm R, Espinoza N, Henning T, Jordán A, Sarkis P, Knudstrup E, Albrecht S, Grundahl F, Fredslund Andersen M, Pallé PL, Crossfield I, Fulton B, Howard AW, Isaacson HT, Weiss LM, Handberg R, Lund MN, Serenelli AM, Rørsted Mosumgaard J, Stokholm A, Bieryla A, Buchhave LA, Latham DW, Quinn SN, Gaidos E, Hirano T, Ricker GR, Vanderspek RK, Seager S, Jenkins JM, Winn JN, Antia HM, Appourchaux T, Basu S, Bell KJ, Benomar O, Bonanno A, Buzasi DL, Campante TL, Çelik Orhan Z, Corsaro E, Cunha MS, Davies GR, Deheuvels S, Grunblatt SK, Hasanzadeh A, Di Mauro MP, García RA, Gaulme P, Girardi L, Guzik JA, Hon M, Jiang C, Kallinger T, Kawaler SD, Kuszlewicz JS, Lebreton Y, Li T, Lucas M, Lundkvist MS, Mann AW, Mathis S, Mathur S, Mazumdar A, Metcalfe TS, Miglio A, Monteiro MJPFG, Mosser B, Noll A, Nsamba B, Ong JMJ, Örtel S, Pereira F, Ranadive P, Régulo C, Rodrigues TS, Roxburgh IW, Silva Aguirre V, Smalley B, Schofield M, Sousa SG, Stassun KG, Stello D, Tayar J, White TR, Verma K, Vrard M, Yıldız M, Baker D, Bazot M, Beichmann C, Bergmann C, Bugnet L, Cale B, Carlino R, Cartwright SM, Christiansen JL, Ciardi DR, Creevey O, Dittmann JA, Do Nascimento J-DJ, Van Eylen V, Fürész G, Gagné J, Gao P, Gazeas K, Giddens F, Hall OJ, Hekker S, Ireland MJ, Latouf N, LeBrun D, Levine AM, Matzko W, Natinsky E, Page E, Plavchan P, Mansouri-Samani M, McCauliff S, Mullally SE, Orenstein B, Garcia Soto A, Paegert M, van Saders JL, Schnaible C, Soderblom DR, Szabó R, Tanner A, Tinney CG, Teske J, Thomas A, Trampedach R, Wright D, Yuan TT, Zohrabi F. 2019. A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS. The Astronomical Journal. 157(6). https://doi.org/10.3847/1538-3881/ab1488

MLA

Vancouver

Huber D, Chaplin WJ, Chontos A, Kjeldsen H, Christensen-Dalsgaard J, Bedding TR o.a. A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS. The Astronomical Journal. 2019 jun 1;157(6). 245. https://doi.org/10.3847/1538-3881/ab1488

Author

Huber, Daniel ; Chaplin, William J. ; Chontos, Ashley ; Kjeldsen, Hans ; Christensen-Dalsgaard, Jørgen ; Bedding, Timothy R. ; Ball, Warrick ; Brahm, Rafael ; Espinoza, Nestor ; Henning, Thomas ; Jordán, Andrés ; Sarkis, Paula ; Knudstrup, Emil ; Albrecht, Simon ; Grundahl, Frank ; Fredslund Andersen, Mads ; Pallé, Pere L. ; Crossfield, Ian ; Fulton, Benjamin ; Howard, Andrew W. ; Isaacson, Howard T. ; Weiss, Lauren M. ; Handberg, Rasmus ; Lund, Mikkel N. ; Serenelli, Aldo M. ; Rørsted Mosumgaard, Jakob ; Stokholm, Amalie ; Bieryla, Allyson ; Buchhave, Lars A. ; Latham, David W. ; Quinn, Samuel N. ; Gaidos, Eric ; Hirano, Teruyuki ; Ricker, George R. ; Vanderspek, Roland K. ; Seager, Sara ; Jenkins, Jon M. ; Winn, Joshua N. ; Antia, H. M. ; Appourchaux, Thierry ; Basu, Sarbani ; Bell, Keaton J. ; Benomar, Othman ; Bonanno, Alfio ; Buzasi, Derek L. ; Campante, Tiago L. ; Çelik Orhan, Z. ; Corsaro, Enrico ; Cunha, Margarida S. ; Davies, Guy R. ; Deheuvels, Sebastien ; Grunblatt, Samuel K. ; Hasanzadeh, Amir ; Di Mauro, Maria Pia ; García, Rafael A. ; Gaulme, Patrick ; Girardi, Léo ; Guzik, Joyce A. ; Hon, Marc ; Jiang, Chen ; Kallinger, Thomas ; Kawaler, Steven D. ; Kuszlewicz, James S. ; Lebreton, Yveline ; Li, Tanda ; Lucas, Miles ; Lundkvist, Mia S. ; Mann, Andrew W. ; Mathis, Stéphane ; Mathur, Savita ; Mazumdar, Anwesh ; Metcalfe, Travis S. ; Miglio, Andrea ; Monteiro, Mário J. P. F. G. ; Mosser, Benoit ; Noll, Anthony ; Nsamba, Benard ; Ong, Jia Mian Joel ; Örtel, S. ; Pereira, Filipe ; Ranadive, Pritesh ; Régulo, Clara ; Rodrigues, Thaíse S. ; Roxburgh, Ian W. ; Silva Aguirre, Victor ; Smalley, Barry ; Schofield, Mathew ; Sousa, Sérgio G. ; Stassun, Keivan G. ; Stello, Dennis ; Tayar, Jamie ; White, Timothy R. ; Verma, Kuldeep ; Vrard, Mathieu ; Yıldız, M. ; Baker, David ; Bazot, Michaël ; Beichmann, Charles ; Bergmann, Christoph ; Bugnet, Lisa ; Cale, Bryson ; Carlino, Roberto ; Cartwright, Scott M. ; Christiansen, Jessie L. ; Ciardi, David R. ; Creevey, Orlagh ; Dittmann, Jason A. ; Do Nascimento, Jose-Dias, Jr. ; Van Eylen, Vincent ; Fürész, Gabor ; Gagné, Jonathan ; Gao, Peter ; Gazeas, Kosmas ; Giddens, Frank ; Hall, Oliver J. ; Hekker, Saskia ; Ireland, Michael J. ; Latouf, Natasha ; LeBrun, Danny ; Levine, Alan M. ; Matzko, William ; Natinsky, Eva ; Page, Emma ; Plavchan, Peter ; Mansouri-Samani, Masoud ; McCauliff, Sean ; Mullally, Susan E. ; Orenstein, Brendan ; Garcia Soto, Aylin ; Paegert, Martin ; van Saders, Jennifer L. ; Schnaible, Chloe ; Soderblom, David R. ; Szabó, Róbert ; Tanner, Angelle ; Tinney, C. G. ; Teske, Johanna ; Thomas, Alexandra ; Trampedach, Regner ; Wright, Duncan ; Yuan, Thomas T. ; Zohrabi, Farzaneh. / A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS. I: The Astronomical Journal. 2019 ; Bind 157, Nr. 6.

Bibtex

@article{1e4b61c8d4904a4195c3bcbb48e504df,
title = "A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS",
abstract = "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 R ⊙), mass (M ⋆ = 1.212 ± 0.074 M ⊙), 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” (R p = 9.17 ± 0.33 R ⊕) with an orbital period of ∼14.3 days, irradiance of F = 343 ± 24 F ⊕, and moderate mass (M p = 60.5 ± 5.7 M ⊕) and density (ρ p = 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.",
keywords = "asteroseismology, techniques: photometric, planets and satellites: individual: HD 221416 b, stars: fundamental parameters, planets and satellites: fundamental parameters",
author = "Daniel Huber and Chaplin, {William J.} and Ashley Chontos and Hans Kjeldsen and J{\o}rgen Christensen-Dalsgaard and Bedding, {Timothy R.} and Warrick Ball and Rafael Brahm and Nestor Espinoza and Thomas Henning and Andr{\'e}s Jord{\'a}n and Paula Sarkis and Emil Knudstrup and Simon Albrecht and Frank Grundahl and {Fredslund Andersen}, Mads and Pall{\'e}, {Pere L.} and Ian Crossfield and Benjamin Fulton and Howard, {Andrew W.} and Isaacson, {Howard T.} and Weiss, {Lauren M.} and Rasmus Handberg and Lund, {Mikkel N.} and Serenelli, {Aldo M.} and {R{\o}rsted Mosumgaard}, Jakob and Amalie Stokholm and Allyson Bieryla and Buchhave, {Lars A.} and Latham, {David W.} and Quinn, {Samuel N.} and Eric Gaidos and Teruyuki Hirano and Ricker, {George R.} and Vanderspek, {Roland K.} and Sara Seager and Jenkins, {Jon M.} and Winn, {Joshua N.} and Antia, {H. M.} and Thierry Appourchaux and Sarbani Basu and Bell, {Keaton J.} and Othman Benomar and Alfio Bonanno and Buzasi, {Derek L.} and Campante, {Tiago L.} and {{\cC}elik Orhan}, Z. and Enrico Corsaro and Cunha, {Margarida S.} and Davies, {Guy R.} and Sebastien Deheuvels and Grunblatt, {Samuel K.} and Amir Hasanzadeh and {Di Mauro}, {Maria Pia} and Garc{\'i}a, {Rafael A.} and Patrick Gaulme and L{\'e}o Girardi and Guzik, {Joyce A.} and Marc Hon and Chen Jiang and Thomas Kallinger and Kawaler, {Steven D.} and Kuszlewicz, {James S.} and Yveline Lebreton and Tanda Li and Miles Lucas and Lundkvist, {Mia S.} and Mann, {Andrew W.} and St{\'e}phane Mathis and Savita Mathur and Anwesh Mazumdar and Metcalfe, {Travis S.} and Andrea Miglio and Monteiro, {M{\'a}rio J. P. F. G.} and Benoit Mosser and Anthony Noll and Benard Nsamba and Ong, {Jia Mian Joel} and S. {\"O}rtel and Filipe Pereira and Pritesh Ranadive and Clara R{\'e}gulo and Rodrigues, {Tha{\'i}se S.} and Roxburgh, {Ian W.} and {Silva Aguirre}, Victor and Barry Smalley and Mathew Schofield and Sousa, {S{\'e}rgio G.} and Stassun, {Keivan G.} and Dennis Stello and Jamie Tayar and White, {Timothy R.} and Kuldeep Verma and Mathieu Vrard and M. Yıldız and David Baker and Micha{\"e}l Bazot and Charles Beichmann and Christoph Bergmann and Lisa Bugnet and Bryson Cale and Roberto Carlino and Cartwright, {Scott M.} and Christiansen, {Jessie L.} and Ciardi, {David R.} and Orlagh Creevey and Dittmann, {Jason A.} and {Do Nascimento}, {Jose-Dias, Jr.} and {Van Eylen}, Vincent and Gabor F{\"u}r{\'e}sz and Jonathan Gagn{\'e} and Peter Gao and Kosmas Gazeas and Frank Giddens and Hall, {Oliver J.} and Saskia Hekker and Ireland, {Michael J.} and Natasha Latouf and Danny LeBrun and Levine, {Alan M.} and William Matzko and Eva Natinsky and Emma Page and Peter Plavchan and Masoud Mansouri-Samani and Sean McCauliff and Mullally, {Susan E.} and Brendan Orenstein and {Garcia Soto}, Aylin and Martin Paegert and {van Saders}, {Jennifer L.} and Chloe Schnaible and Soderblom, {David R.} and R{\'o}bert Szab{\'o} and Angelle Tanner and Tinney, {C. G.} and Johanna Teske and Alexandra Thomas and Regner Trampedach and Duncan Wright and Yuan, {Thomas T.} and Farzaneh Zohrabi",
year = "2019",
month = "6",
day = "1",
doi = "10.3847/1538-3881/ab1488",
language = "English",
volume = "157",
journal = "The Astronomical Journal",
issn = "0004-6256",
publisher = "Institute of Physics Publishing, Inc",
number = "6",

}

RIS

TY - JOUR

T1 - A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS

AU - Huber, Daniel

AU - Chaplin, William J.

AU - Chontos, Ashley

AU - Kjeldsen, Hans

AU - Christensen-Dalsgaard, Jørgen

AU - Bedding, Timothy R.

AU - Ball, Warrick

AU - Brahm, Rafael

AU - Espinoza, Nestor

AU - Henning, Thomas

AU - Jordán, Andrés

AU - Sarkis, Paula

AU - Knudstrup, Emil

AU - Albrecht, Simon

AU - Grundahl, Frank

AU - Fredslund Andersen, Mads

AU - Pallé, Pere L.

AU - Crossfield, Ian

AU - Fulton, Benjamin

AU - Howard, Andrew W.

AU - Isaacson, Howard T.

AU - Weiss, Lauren M.

AU - Handberg, Rasmus

AU - Lund, Mikkel N.

AU - Serenelli, Aldo M.

AU - Rørsted Mosumgaard, Jakob

AU - Stokholm, Amalie

AU - Bieryla, Allyson

AU - Buchhave, Lars A.

AU - Latham, David W.

AU - Quinn, Samuel N.

AU - Gaidos, Eric

AU - Hirano, Teruyuki

AU - Ricker, George R.

AU - Vanderspek, Roland K.

AU - Seager, Sara

AU - Jenkins, Jon M.

AU - Winn, Joshua N.

AU - Antia, H. M.

AU - Appourchaux, Thierry

AU - Basu, Sarbani

AU - Bell, Keaton J.

AU - Benomar, Othman

AU - Bonanno, Alfio

AU - Buzasi, Derek L.

AU - Campante, Tiago L.

AU - Çelik Orhan, Z.

AU - Corsaro, Enrico

AU - Cunha, Margarida S.

AU - Davies, Guy R.

AU - Deheuvels, Sebastien

AU - Grunblatt, Samuel K.

AU - Hasanzadeh, Amir

AU - Di Mauro, Maria Pia

AU - García, Rafael A.

AU - Gaulme, Patrick

AU - Girardi, Léo

AU - Guzik, Joyce A.

AU - Hon, Marc

AU - Jiang, Chen

AU - Kallinger, Thomas

AU - Kawaler, Steven D.

AU - Kuszlewicz, James S.

AU - Lebreton, Yveline

AU - Li, Tanda

AU - Lucas, Miles

AU - Lundkvist, Mia S.

AU - Mann, Andrew W.

AU - Mathis, Stéphane

AU - Mathur, Savita

AU - Mazumdar, Anwesh

AU - Metcalfe, Travis S.

AU - Miglio, Andrea

AU - Monteiro, Mário J. P. F. G.

AU - Mosser, Benoit

AU - Noll, Anthony

AU - Nsamba, Benard

AU - Ong, Jia Mian Joel

AU - Örtel, S.

AU - Pereira, Filipe

AU - Ranadive, Pritesh

AU - Régulo, Clara

AU - Rodrigues, Thaíse S.

AU - Roxburgh, Ian W.

AU - Silva Aguirre, Victor

AU - Smalley, Barry

AU - Schofield, Mathew

AU - Sousa, Sérgio G.

AU - Stassun, Keivan G.

AU - Stello, Dennis

AU - Tayar, Jamie

AU - White, Timothy R.

AU - Verma, Kuldeep

AU - Vrard, Mathieu

AU - Yıldız, M.

AU - Baker, David

AU - Bazot, Michaël

AU - Beichmann, Charles

AU - Bergmann, Christoph

AU - Bugnet, Lisa

AU - Cale, Bryson

AU - Carlino, Roberto

AU - Cartwright, Scott M.

AU - Christiansen, Jessie L.

AU - Ciardi, David R.

AU - Creevey, Orlagh

AU - Dittmann, Jason A.

AU - Do Nascimento, Jose-Dias, Jr.

AU - Van Eylen, Vincent

AU - Fürész, Gabor

AU - Gagné, Jonathan

AU - Gao, Peter

AU - Gazeas, Kosmas

AU - Giddens, Frank

AU - Hall, Oliver J.

AU - Hekker, Saskia

AU - Ireland, Michael J.

AU - Latouf, Natasha

AU - LeBrun, Danny

AU - Levine, Alan M.

AU - Matzko, William

AU - Natinsky, Eva

AU - Page, Emma

AU - Plavchan, Peter

AU - Mansouri-Samani, Masoud

AU - McCauliff, Sean

AU - Mullally, Susan E.

AU - Orenstein, Brendan

AU - Garcia Soto, Aylin

AU - Paegert, Martin

AU - van Saders, Jennifer L.

AU - Schnaible, Chloe

AU - Soderblom, David R.

AU - Szabó, Róbert

AU - Tanner, Angelle

AU - Tinney, C. G.

AU - Teske, Johanna

AU - Thomas, Alexandra

AU - Trampedach, Regner

AU - Wright, Duncan

AU - Yuan, Thomas T.

AU - Zohrabi, Farzaneh

PY - 2019/6/1

Y1 - 2019/6/1

N2 - 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 R ⊙), mass (M ⋆ = 1.212 ± 0.074 M ⊙), 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” (R p = 9.17 ± 0.33 R ⊕) with an orbital period of ∼14.3 days, irradiance of F = 343 ± 24 F ⊕, and moderate mass (M p = 60.5 ± 5.7 M ⊕) and density (ρ p = 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.

AB - 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 R ⊙), mass (M ⋆ = 1.212 ± 0.074 M ⊙), 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” (R p = 9.17 ± 0.33 R ⊕) with an orbital period of ∼14.3 days, irradiance of F = 343 ± 24 F ⊕, and moderate mass (M p = 60.5 ± 5.7 M ⊕) and density (ρ p = 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.

KW - asteroseismology

KW - techniques: photometric

KW - planets and satellites: individual: HD 221416 b

KW - stars: fundamental parameters

KW - planets and satellites: fundamental parameters

U2 - 10.3847/1538-3881/ab1488

DO - 10.3847/1538-3881/ab1488

M3 - Journal article

VL - 157

JO - The Astronomical Journal

JF - The Astronomical Journal

SN - 0004-6256

IS - 6

M1 - 245

ER -