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; 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

doi:10.1093/mnras/staa3960

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 BentleyStephen 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

Physics and Astronomy

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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 MJ (43.9 ± 7.3 M⊕⁠), a radius of RP = 0.639 ± 0.013 RJ (7.16 ± 0.15 R⊕⁠), bulk density of 0.65+0.12−0.11 (cgs), and period 18.38818+0.00085−0.00084 days⁠. TOI-257b orbits a bright (V = 7.612 mag) somewhat evolved late F-type star with M* = 1.390 ± 0.046 Msun⁠, R* = 1.888 ± 0.033 Rsun⁠, Teff = 6075 ± 90 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.

Original language	English
Pages (from-to)	3704–3722
Journal	Monthly Notices of the Royal Astronomical Society
Volume	502
Issue number	3
Early online date	28 Dec 2020
DOIs	https://doi.org/10.1093/mnras/staa3960
Publication status	E-pub ahead of print - 28 Dec 2020

Bibliographical note

21 pages, 20 figures, 5 tables, submitted to MNRAS. Feedback welcome!

Keywords

asteroseismology
techniques: photometric
techniques: radial velocities
techniques : spectroscopic
planetary systems
stars: individual (TIC 200723869/TOI-257)

Access to Document

10.1093/mnras/staa3960Licence: None: All rights reserved

addisonbtoi257
This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Brett C Addison et al TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star, Monthly Notices of the Royal Astronomical Society, Volume 502, Issue 3, April 2021, Pages 3704–3722 is available online at: https://doi.org/10.1093/mnras/staa3960
Accepted author manuscript, 8.63 MBLicence: None: All rights reserved

https://doi.org/10.1093/mnras/staa3960Licence: None: All rights reserved

Cite this

Addison, B. C., Wright, D. J., Nicholson, B. A., Cale, B., Mocnik, T., Huber, D., Plavchan, P., Wittenmyer, R. A., Vanderburg, A., Chaplin, W. J., Chontos, A., Clark, J. T., Eastman, J. D., Ziegler, C., Brahm, R., Carter, B. D., Clerte, M., Espinoza, N., Horner, J., ... Themessl, N. (2020). TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star. Monthly Notices of the Royal Astronomical Society, 502(3), 3704–3722. Advance online publication. https://doi.org/10.1093/mnras/staa3960

@article{bcb3b9a259b84f08af7159087f78b508,

title = "TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star",

abstract = "We report the discovery of a warm sub-Saturn, TOI-257b (HD 19916b), based on data from NASA{\textquoteright}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 MJ (43.9 ± 7.3 M⊕⁠), a radius of RP = 0.639 ± 0.013 RJ (7.16 ± 0.15 R⊕⁠), bulk density of 0.65+0.12−0.11 (cgs), and period 18.38818+0.00085−0.00084 days⁠. TOI-257b orbits a bright (V = 7.612 mag) somewhat evolved late F-type star with M* = 1.390 ± 0.046 Msun⁠, R* = 1.888 ± 0.033 Rsun⁠, Teff = 6075 ± 90 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.",

keywords = "asteroseismology, techniques: photometric, techniques: radial velocities, techniques : spectroscopic, planetary systems, stars: individual (TIC 200723869/TOI-257)",

author = "Addison, {Brett C.} and Wright, {Duncan J.} and Nicholson, {Belinda A.} and Bryson Cale and Teo Mocnik and Daniel Huber and Peter Plavchan and Wittenmyer, {Robert A.} and Andrew Vanderburg and Chaplin, {William J.} and Ashley Chontos and Clark, {Jake T.} and Eastman, {Jason D.} and Carl Ziegler and Rafael Brahm and Carter, {Bradley D.} and Mathieu Clerte and N{\'e}stor Espinoza and Jonathan Horner and John Bentley and Kane, {Stephen R.} and Kielkopf, {John F.} and Emilie Laychock and Mengel, {Matthew W.} and Jack Okumura and Stassun, {Keivan G.} and Bedding, {Timothy R.} and Bowler, {Brendan P.} and Andrius Burnelis and Michaela Collins and Ian Crossfield and Davis, {Allen B.} and Dag Evensberget and Alexis Heitzmann and Howell, {Steve B.} and Nicholas Law and Mann, {Andrew W.} and Stephen Marsden and James O'Connor and Avi Shporer and Catherine Stevens and Tinney, {C. G.} and Christopher Tylor and Songhu Wang and Hui Zhang and Thomas Henning and Diana Kossakowski and George Ricker and Paula Sarkis and Roland Vanderspek and Latham, {David W.} and Sara Seager and Winn, {Joshua N.} and Jenkins, {Jon M.} and Ismael Mireles and Pam Rowden and Joshua Pepper and Tansu Daylan and Schlieder, {Joshua E.} and Collins, {Karen A.} and Collins, {Kevin I.} and Thiam-Guan Tan and Ball, {Warrick H.} and Sarbani Basu and Buzasi, {Derek L.} and Campante, {Tiago L.} and Enrico Corsaro and Luc{\'i}a Gonz{\'a}lez-Cuesta and Davies, {Guy R.} and a, {Rafael ~A. ~Garc{\'i}} and Zhao Guo and Rasmus Handberg and Saskia Hekker and Hey, {Daniel R.} and Thomas Kallinger and Kawaler, {Steven D.} and Cenk Kayhan and Kuszlewicz, {James S.} and Lund, {Mikkel N.} and Alexander Lyttle and Savita Mathur and Andrea Miglio and Benoit Mosser and Nielsen, {Martin B.} and Serenelli, {Aldo M.} and Aguirre, {Victor Silva} and Nathalie Themessl",

note = "21 pages, 20 figures, 5 tables, submitted to MNRAS. Feedback welcome!",

year = "2020",

month = dec,

day = "28",

doi = "10.1093/mnras/staa3960",

language = "English",

volume = "502",

pages = "3704–3722",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "SIPRI/Oxford University Press",

number = "3",

}

Addison, BC, Wright, DJ, Nicholson, BA, Cale, B, Mocnik, T, Huber, D, Plavchan, P, Wittenmyer, RA, Vanderburg, A, Chaplin, WJ, Chontos, A, Clark, JT, Eastman, JD, Ziegler, C, Brahm, R, Carter, BD, Clerte, M, Espinoza, N, Horner, J, Bentley, J, Kane, SR, Kielkopf, JF, Laychock, E, Mengel, MW, Okumura, J, Stassun, KG, Bedding, TR, Bowler, BP, Burnelis, A, Collins, M, Crossfield, I, Davis, AB, Evensberget, D, Heitzmann, A, Howell, SB, Law, N, Mann, AW, Marsden, S, O'Connor, J, Shporer, A, Stevens, C, Tinney, CG, Tylor, C, Wang, S, Zhang, H, Henning, T, Kossakowski, D, Ricker, G, Sarkis, P, Vanderspek, R, Latham, DW, Seager, S, Winn, JN, Jenkins, JM, Mireles, I, Rowden, P, Pepper, J, Daylan, T, Schlieder, JE, Collins, KA, Collins, KI, Tan, T-G, Ball, WH, Basu, S, Buzasi, DL, Campante, TL, Corsaro, E, González-Cuesta, L, Davies, GR, a, RAG, Guo, Z, Handberg, R, Hekker, S, Hey, DR, Kallinger, T, Kawaler, SD, Kayhan, C, Kuszlewicz, JS, Lund, MN, Lyttle, A, Mathur, S, Miglio, A, Mosser, B, Nielsen, MB, Serenelli, AM, Aguirre, VS & Themessl, N 2020, 'TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star', Monthly Notices of the Royal Astronomical Society, vol. 502, no. 3, pp. 3704–3722. https://doi.org/10.1093/mnras/staa3960

TY - JOUR

T1 - TOI-257b (HD 19916b)

T2 - a warm sub-saturn orbiting an evolved F-type star

AU - Addison, Brett C.

AU - Wright, Duncan J.

AU - Nicholson, Belinda A.

AU - Cale, Bryson

AU - Mocnik, Teo

AU - Huber, Daniel

AU - Plavchan, Peter

AU - Wittenmyer, Robert A.

AU - Vanderburg, Andrew

AU - Chaplin, William J.

AU - Chontos, Ashley

AU - Clark, Jake T.

AU - Eastman, Jason D.

AU - Ziegler, Carl

AU - Brahm, Rafael

AU - Carter, Bradley D.

AU - Clerte, Mathieu

AU - Espinoza, Néstor

AU - Horner, Jonathan

AU - Bentley, John

AU - Kane, Stephen R.

AU - Kielkopf, John F.

AU - Laychock, Emilie

AU - Mengel, Matthew W.

AU - Okumura, Jack

AU - Stassun, Keivan G.

AU - Bedding, Timothy R.

AU - Bowler, Brendan P.

AU - Burnelis, Andrius

AU - Collins, Michaela

AU - Crossfield, Ian

AU - Davis, Allen B.

AU - Evensberget, Dag

AU - Heitzmann, Alexis

AU - Howell, Steve B.

AU - Law, Nicholas

AU - Mann, Andrew W.

AU - Marsden, Stephen

AU - O'Connor, James

AU - Shporer, Avi

AU - Stevens, Catherine

AU - Tinney, C. G.

AU - Tylor, Christopher

AU - Wang, Songhu

AU - Zhang, Hui

AU - Henning, Thomas

AU - Kossakowski, Diana

AU - Ricker, George

AU - Sarkis, Paula

AU - Vanderspek, Roland

AU - Latham, David W.

AU - Seager, Sara

AU - Winn, Joshua N.

AU - Jenkins, Jon M.

AU - Mireles, Ismael

AU - Rowden, Pam

AU - Pepper, Joshua

AU - Daylan, Tansu

AU - Schlieder, Joshua E.

AU - Collins, Karen A.

AU - Collins, Kevin I.

AU - Tan, Thiam-Guan

AU - Ball, Warrick H.

AU - Basu, Sarbani

AU - Buzasi, Derek L.

AU - Campante, Tiago L.

AU - Corsaro, Enrico

AU - González-Cuesta, Lucía

AU - Davies, Guy R.

AU - a, Rafael ~A. ~Garcí

AU - Guo, Zhao

AU - Handberg, Rasmus

AU - Hekker, Saskia

AU - Hey, Daniel R.

AU - Kallinger, Thomas

AU - Kawaler, Steven D.

AU - Kayhan, Cenk

AU - Kuszlewicz, James S.

AU - Lund, Mikkel N.

AU - Lyttle, Alexander

AU - Mathur, Savita

AU - Miglio, Andrea

AU - Mosser, Benoit

AU - Nielsen, Martin B.

AU - Serenelli, Aldo M.

AU - Aguirre, Victor Silva

AU - Themessl, Nathalie

N1 - 21 pages, 20 figures, 5 tables, submitted to MNRAS. Feedback welcome!

PY - 2020/12/28

Y1 - 2020/12/28

N2 - 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 MJ (43.9 ± 7.3 M⊕⁠), a radius of RP = 0.639 ± 0.013 RJ (7.16 ± 0.15 R⊕⁠), bulk density of 0.65+0.12−0.11 (cgs), and period 18.38818+0.00085−0.00084 days⁠. TOI-257b orbits a bright (V = 7.612 mag) somewhat evolved late F-type star with M* = 1.390 ± 0.046 Msun⁠, R* = 1.888 ± 0.033 Rsun⁠, Teff = 6075 ± 90 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.

AB - 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 MJ (43.9 ± 7.3 M⊕⁠), a radius of RP = 0.639 ± 0.013 RJ (7.16 ± 0.15 R⊕⁠), bulk density of 0.65+0.12−0.11 (cgs), and period 18.38818+0.00085−0.00084 days⁠. TOI-257b orbits a bright (V = 7.612 mag) somewhat evolved late F-type star with M* = 1.390 ± 0.046 Msun⁠, R* = 1.888 ± 0.033 Rsun⁠, Teff = 6075 ± 90 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.

KW - asteroseismology

KW - techniques: photometric

KW - techniques: radial velocities

KW - techniques : spectroscopic

KW - planetary systems

KW - stars: individual (TIC 200723869/TOI-257)

U2 - 10.1093/mnras/staa3960

DO - 10.1093/mnras/staa3960

M3 - Article

SN - 0035-8711

VL - 502

SP - 3704

EP - 3722

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star

Abstract

Bibliographical note

Keywords

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