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

Sha, Lizhou and Huang, Chelsea X. and Shporer, Avi and Rodriguez, Joseph E. and Vanderburg, Andrew and Brahm, Rafael and Hagelberg, Janis and Matthews, Elisabeth C. and Ziegler, Carl and Livingston, John H. and Stassun, Keivan G. and Wright, Duncan J. and Crane, Jeffrey D. and Espinoza, Nestor and Bouchy, Francois and Bakos, Gaspar A. and Collins, Karen A. and Zhou, George and Bieryla, Allyson and Hartman, Joel D. and Wittenmyer, Robert A. and Nielsen, Louise D. and Plavchan, Peter and Bayliss, Daniel and Sarkis, Paula and Tan, Thiam-Guan and Cloutier, Ryan and Mancini, Luigi and Jordan, Andres and Wang, Sharon and Henning, Thomas and Narita, Norio and Penev, Kaloyan and Teske, Johanna K. and Kane, Stephen R. and Mann, Andrew W. and Addison, Brett C. ORCID: https://orcid.org/0000-0003-3216-0626 and Tamura, Motohide and Horner, Jonathan and Barbieri, Mauro and Burt, Jennifer A. and Diaz, Matias R. and Crossfield, Ian J. M. and Dragomir, Diana and Drass, Holger and Feinstein, Adina D. and Zhang, Hui and Hart, Rhodes and Kielkopf, John F. and Jensen, Eric L. N. and Montet, Benjamin T. and Ottoni, Gael and Schwarz, Richard P. and Rojas, Felipe and Nespral, David and Torres, Pascal and Mengel, Matthew W. and Udry, Stephane and Zapata, Abner and Snoddy, Erin and Okumura, Jack and Ricker, George R. and Vanderspek, Roland K. and Latham, David W. and Winn, Joshua N. and Seager, Sara and Jenkins, Jon M. and Colon, Knicole D. and Henze, Christopher E. and Krishnamurthy, Akshata and Ting, Eric B. and Vezie, Michael and Villanueva, Steven (2021) TOI-954 b and K2-329 b: short-period Saturn-mass planets that test whether irradiation leads to inflation. The Astronomical Journal, 161 (2):82. ISSN 0004-6256

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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 ${0.852}_{-0.062}^{+0.053}\,{R}_{{\rm{J}}}$ and a mass of ${0.174}_{-0.017}^{+0.018}$ MJ and is in a 3.68 day orbit, while K2-329 b has a radius of ${0.774}_{-0.024}^{+0.026}\,{R}_{{\rm{J}}}$ and a mass of ${0.260}_{-0.022}^{+0.020}$ 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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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2021. The American Astronomical Society. Submitted version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 10 Aug 2021 05:10
Last Modified: 11 Aug 2021 06:18
Uncontrolled Keywords: exoplanet systems; photometry; transit photometry; spectroscopy; high; resolution spectroscopy; RV; G stars; G dwarf stars; G subgiant stars; hot Jupiters; 484; 1234; 1709; 1558; 2096; 1332; 558; 556; 560; 753; astrophysics;
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.3847/1538-3881/abd187
URI: http://eprints.usq.edu.au/id/eprint/42820

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