TOI-954 b and K2-329 b: Short-period saturn-mass planets that test whether irradiation leads to inflation

Lizhou Sha; Chelsea X. Huang; Avi Shporer; Joseph E. Rodriguez; Andrew Vanderburg; Rafael Brahm; Janis Hagelberg; Elisabeth C. Matthews; Carl Ziegler; John H. Livingston; Keivan G. Stassun; Duncan J. Wright; Jeffrey D. Crane; Néstor Espinoza; François Bouchy; Gáspár Bakos; Karen A. Collins; George Zhou; Allyson Bieryla; Joel D. Hartman; Robert A. Wittenmyer; Louise D. Nielsen; Peter Plavchan; Daniel Bayliss; Paula Sarkis; Thiam Guan Tan; Ryan Cloutier; Luigi Mancini; Andrés Jordán; Sharon Wang; Thomas Henning; Norio Narita; Kaloyan Penev; Johanna K. Teske; Stephen R. Kane; Andrew W. Mann; Brett C. Addison; Motohide Tamura; Jonathan Horner; Mauro Barbieri; Jennifer A. Burt; Matías R. Díaz; Ian J.M. Crossfield; Diana Dragomir; Holger Drass; Adina D. Feinstein; Hui Zhang; Rhodes Hart; John F. Kielkopf; Eric L.N. Jensen; Benjamin T. Montet; Gaël Ottoni; Richard P. Schwarz; Felipe Rojas; David Nespral; Pascal Torres; Matthew W. Mengel; Stéphane Udry; Abner Zapata; Erin Snoddy; Jack Okumura; George R. Ricker; Roland K. Vanderspek; David W. Latham; Joshua N. Winn; Sara Seager; Jon M. Jenkins; Knicole D. Colón; Christopher E. Henze; Akshata Krishnamurthy; Eric B. Ting; Michael Vezie; Steven Villanueva

doi:10.3847/1538-3881/abd187

TOI-954 b and K2-329 b: Short-period saturn-mass planets that test whether irradiation leads to inflation

Lizhou Sha, Chelsea X. Huang, Avi Shporer, Joseph E. Rodriguez, Andrew Vanderburg, Rafael Brahm, Janis Hagelberg, Elisabeth C. Matthews, Carl Ziegler, John H. Livingston, Keivan G. Stassun, Duncan J. Wright, Jeffrey D. Crane, Néstor Espinoza, François Bouchy, Gáspár Bakos, Karen A. Collins, George Zhou, Allyson Bieryla, Joel D. HartmanRobert A. Wittenmyer, Louise D. Nielsen, Peter Plavchan, Daniel Bayliss, Paula Sarkis, Thiam Guan Tan, Ryan Cloutier, Luigi Mancini, Andrés Jordán, Sharon Wang, Thomas Henning, Norio Narita, Kaloyan Penev, Johanna K. Teske, Stephen R. Kane, Andrew W. Mann, Brett C. Addison, Motohide Tamura, Jonathan Horner, Mauro Barbieri, Jennifer A. Burt, Matías R. Díaz, Ian J.M. Crossfield, Diana Dragomir, Holger Drass, Adina D. Feinstein, Hui Zhang, Rhodes Hart, John F. Kielkopf, Eric L.N. Jensen, Benjamin T. Montet, Gaël Ottoni, Richard P. Schwarz, Felipe Rojas, David Nespral, Pascal Torres, Matthew W. Mengel, Stéphane Udry, Abner Zapata, Erin Snoddy, Jack Okumura, George R. Ricker, Roland K. Vanderspek, David W. Latham, Joshua N. Winn, Sara Seager, Jon M. Jenkins, Knicole D. Colón, Christopher E. Henze, Akshata Krishnamurthy, Eric B. Ting, Michael Vezie, Steven Villanueva

Astrophysical Sciences

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Abstract

We report the discovery of two short-period Saturn-mass planets, one transiting the G subgiant TOI-954 (TIC 44792534, V = 10.343, T = 9.78) observed in TESS sectors 4 and 5 and one transiting the G dwarf K2-329 (EPIC 246193072, V = 12.70, K = 10.67) observed in K2 campaigns 12 and 19. We confirm and characterize these two planets with a variety of ground-based archival and follow-up observations, including photometry, reconnaissance spectroscopy, precise radial velocity, and high-resolution imaging. Combining all available data, we find that TOI-954 b has a radius of 0.852+0.053-0.062 RJ and a mass of 0.174+0.018-0.017 MJ and is in a 3.68 day orbit, while K2-329 b has a radius of 0.774+0.026-0.024 RJ and a mass of 0.260+0.020-0.022 MJ and is in a 12.46 day orbit. As TOI-954 b is 30 times more irradiated than K2-329 b but more or less the same size, these two planets provide an opportunity to test whether irradiation leads to inflation of Saturn-mass planets and contribute to future comparative studies that explore Saturn-mass planets at contrasting points in their lifetimes.

Original language	English (US)
Article number	abd187
Journal	Astronomical Journal
Volume	161
Issue number	2
DOIs	https://doi.org/10.3847/1538-3881/abd187
State	Published - Feb 1 2021

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-3881/abd187

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Sha, L., Huang, C. X., Shporer, A., Rodriguez, J. E., Vanderburg, A., Brahm, R., Hagelberg, J., Matthews, E. C., Ziegler, C., Livingston, J. H., Stassun, K. G., Wright, D. J., Crane, J. D., Espinoza, N., Bouchy, F., Bakos, G., Collins, K. A., Zhou, G., Bieryla, A., ... Villanueva, S. (2021). TOI-954 b and K2-329 b: Short-period saturn-mass planets that test whether irradiation leads to inflation. Astronomical Journal, 161(2), Article abd187. https://doi.org/10.3847/1538-3881/abd187

@article{31fb1268707d45e2a47f5d77d5b13288,

title = "TOI-954 b and K2-329 b: Short-period saturn-mass planets that test whether irradiation leads to inflation",

abstract = "We report the discovery of two short-period Saturn-mass planets, one transiting the G subgiant TOI-954 (TIC 44792534, V = 10.343, T = 9.78) observed in TESS sectors 4 and 5 and one transiting the G dwarf K2-329 (EPIC 246193072, V = 12.70, K = 10.67) observed in K2 campaigns 12 and 19. We confirm and characterize these two planets with a variety of ground-based archival and follow-up observations, including photometry, reconnaissance spectroscopy, precise radial velocity, and high-resolution imaging. Combining all available data, we find that TOI-954 b has a radius of 0.852+0.053-0.062 RJ and a mass of 0.174+0.018-0.017 MJ and is in a 3.68 day orbit, while K2-329 b has a radius of 0.774+0.026-0.024 RJ and a mass of 0.260+0.020-0.022 MJ and is in a 12.46 day orbit. As TOI-954 b is 30 times more irradiated than K2-329 b but more or less the same size, these two planets provide an opportunity to test whether irradiation leads to inflation of Saturn-mass planets and contribute to future comparative studies that explore Saturn-mass planets at contrasting points in their lifetimes.",

author = "Lizhou Sha and Huang, {Chelsea X.} and Avi Shporer and Rodriguez, {Joseph E.} and Andrew Vanderburg and Rafael Brahm and Janis Hagelberg and Matthews, {Elisabeth C.} and Carl Ziegler and Livingston, {John H.} and Stassun, {Keivan G.} and Wright, {Duncan J.} and Crane, {Jeffrey D.} and N{\'e}stor Espinoza and Fran{\c c}ois Bouchy and G{\'a}sp{\'a}r Bakos and Collins, {Karen A.} and George Zhou and Allyson Bieryla and Hartman, {Joel D.} and Wittenmyer, {Robert A.} and Nielsen, {Louise D.} and Peter Plavchan and Daniel Bayliss and Paula Sarkis and Tan, {Thiam Guan} and Ryan Cloutier and Luigi Mancini and Andr{\'e}s Jord{\'a}n and Sharon Wang and Thomas Henning and Norio Narita and Kaloyan Penev and Teske, {Johanna K.} and Kane, {Stephen R.} and Mann, {Andrew W.} and Addison, {Brett C.} and Motohide Tamura and Jonathan Horner and Mauro Barbieri and Burt, {Jennifer A.} and D{\'i}az, {Mat{\'i}as R.} and Crossfield, {Ian J.M.} and Diana Dragomir and Holger Drass and Feinstein, {Adina D.} and Hui Zhang and Rhodes Hart and Kielkopf, {John F.} and Jensen, {Eric L.N.} and Montet, {Benjamin T.} and Ga{\"e}l Ottoni and Schwarz, {Richard P.} and Felipe Rojas and David Nespral and Pascal Torres and Mengel, {Matthew W.} and St{\'e}phane Udry and Abner Zapata and Erin Snoddy and Jack Okumura and Ricker, {George R.} and Vanderspek, {Roland K.} and Latham, {David W.} and Winn, {Joshua N.} and Sara Seager and Jenkins, {Jon M.} and Col{\'o}n, {Knicole D.} and Henze, {Christopher E.} and Akshata Krishnamurthy and Ting, {Eric B.} and Michael Vezie and Steven Villanueva",

year = "2021",

month = feb,

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doi = "10.3847/1538-3881/abd187",

language = "English (US)",

volume = "161",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "IOP Publishing Ltd.",

number = "2",

}

Sha, L, Huang, CX, Shporer, A, Rodriguez, JE, Vanderburg, A, Brahm, R, Hagelberg, J, Matthews, EC, Ziegler, C, Livingston, JH, Stassun, KG, Wright, DJ, Crane, JD, Espinoza, N, Bouchy, F, Bakos, G, Collins, KA, Zhou, G, Bieryla, A, Hartman, JD, Wittenmyer, RA, Nielsen, LD, Plavchan, P, Bayliss, D, Sarkis, P, Tan, TG, Cloutier, R, Mancini, L, Jordán, A, Wang, S, Henning, T, Narita, N, Penev, K, Teske, JK, Kane, SR, Mann, AW, Addison, BC, Tamura, M, Horner, J, Barbieri, M, Burt, JA, Díaz, MR, Crossfield, IJM, Dragomir, D, Drass, H, Feinstein, AD, Zhang, H, Hart, R, Kielkopf, JF, Jensen, ELN, Montet, BT, Ottoni, G, Schwarz, RP, Rojas, F, Nespral, D, Torres, P, Mengel, MW, Udry, S, Zapata, A, Snoddy, E, Okumura, J, Ricker, GR, Vanderspek, RK, Latham, DW, Winn, JN, Seager, S, Jenkins, JM, Colón, KD, Henze, CE, Krishnamurthy, A, Ting, EB, Vezie, M & Villanueva, S 2021, 'TOI-954 b and K2-329 b: Short-period saturn-mass planets that test whether irradiation leads to inflation', Astronomical Journal, vol. 161, no. 2, abd187. https://doi.org/10.3847/1538-3881/abd187

TY - JOUR

T1 - TOI-954 b and K2-329 b

T2 - Short-period saturn-mass planets that test whether irradiation leads to inflation

AU - Sha, Lizhou

AU - Huang, Chelsea X.

AU - Shporer, Avi

AU - Rodriguez, Joseph E.

AU - Vanderburg, Andrew

AU - Brahm, Rafael

AU - Hagelberg, Janis

AU - Matthews, Elisabeth C.

AU - Ziegler, Carl

AU - Livingston, John H.

AU - Stassun, Keivan G.

AU - Wright, Duncan J.

AU - Crane, Jeffrey D.

AU - Espinoza, Néstor

AU - Bouchy, François

AU - Bakos, Gáspár

AU - Collins, Karen A.

AU - Zhou, George

AU - Bieryla, Allyson

AU - Hartman, Joel D.

AU - Wittenmyer, Robert A.

AU - Nielsen, Louise D.

AU - Plavchan, Peter

AU - Bayliss, Daniel

AU - Sarkis, Paula

AU - Tan, Thiam Guan

AU - Cloutier, Ryan

AU - Mancini, Luigi

AU - Jordán, Andrés

AU - Wang, Sharon

AU - Henning, Thomas

AU - Narita, Norio

AU - Penev, Kaloyan

AU - Teske, Johanna K.

AU - Kane, Stephen R.

AU - Mann, Andrew W.

AU - Addison, Brett C.

AU - Tamura, Motohide

AU - Horner, Jonathan

AU - Barbieri, Mauro

AU - Burt, Jennifer A.

AU - Díaz, Matías R.

AU - Crossfield, Ian J.M.

AU - Dragomir, Diana

AU - Drass, Holger

AU - Feinstein, Adina D.

AU - Zhang, Hui

AU - Hart, Rhodes

AU - Kielkopf, John F.

AU - Jensen, Eric L.N.

AU - Montet, Benjamin T.

AU - Ottoni, Gaël

AU - Schwarz, Richard P.

AU - Rojas, Felipe

AU - Nespral, David

AU - Torres, Pascal

AU - Mengel, Matthew W.

AU - Udry, Stéphane

AU - Zapata, Abner

AU - Snoddy, Erin

AU - Okumura, Jack

AU - Ricker, George R.

AU - Vanderspek, Roland K.

AU - Latham, David W.

AU - Winn, Joshua N.

AU - Seager, Sara

AU - Jenkins, Jon M.

AU - Colón, Knicole D.

AU - Henze, Christopher E.

AU - Krishnamurthy, Akshata

AU - Ting, Eric B.

AU - Vezie, Michael

AU - Villanueva, Steven

PY - 2021/2/1

Y1 - 2021/2/1

N2 - We report the discovery of two short-period Saturn-mass planets, one transiting the G subgiant TOI-954 (TIC 44792534, V = 10.343, T = 9.78) observed in TESS sectors 4 and 5 and one transiting the G dwarf K2-329 (EPIC 246193072, V = 12.70, K = 10.67) observed in K2 campaigns 12 and 19. We confirm and characterize these two planets with a variety of ground-based archival and follow-up observations, including photometry, reconnaissance spectroscopy, precise radial velocity, and high-resolution imaging. Combining all available data, we find that TOI-954 b has a radius of 0.852+0.053-0.062 RJ and a mass of 0.174+0.018-0.017 MJ and is in a 3.68 day orbit, while K2-329 b has a radius of 0.774+0.026-0.024 RJ and a mass of 0.260+0.020-0.022 MJ and is in a 12.46 day orbit. As TOI-954 b is 30 times more irradiated than K2-329 b but more or less the same size, these two planets provide an opportunity to test whether irradiation leads to inflation of Saturn-mass planets and contribute to future comparative studies that explore Saturn-mass planets at contrasting points in their lifetimes.

AB - We report the discovery of two short-period Saturn-mass planets, one transiting the G subgiant TOI-954 (TIC 44792534, V = 10.343, T = 9.78) observed in TESS sectors 4 and 5 and one transiting the G dwarf K2-329 (EPIC 246193072, V = 12.70, K = 10.67) observed in K2 campaigns 12 and 19. We confirm and characterize these two planets with a variety of ground-based archival and follow-up observations, including photometry, reconnaissance spectroscopy, precise radial velocity, and high-resolution imaging. Combining all available data, we find that TOI-954 b has a radius of 0.852+0.053-0.062 RJ and a mass of 0.174+0.018-0.017 MJ and is in a 3.68 day orbit, while K2-329 b has a radius of 0.774+0.026-0.024 RJ and a mass of 0.260+0.020-0.022 MJ and is in a 12.46 day orbit. As TOI-954 b is 30 times more irradiated than K2-329 b but more or less the same size, these two planets provide an opportunity to test whether irradiation leads to inflation of Saturn-mass planets and contribute to future comparative studies that explore Saturn-mass planets at contrasting points in their lifetimes.

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UR - http://www.scopus.com/inward/citedby.url?scp=85101636461&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/abd187

DO - 10.3847/1538-3881/abd187

M3 - Article

AN - SCOPUS:85101636461

SN - 0004-6256

VL - 161

JO - Astronomical Journal

JF - Astronomical Journal

IS - 2

M1 - abd187

ER -

TOI-954 b and K2-329 b: Short-period saturn-mass planets that test whether irradiation leads to inflation

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