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

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


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 languageEnglish (US)
Article numberabd187
JournalAstronomical Journal
Issue number2
StatePublished - Feb 1 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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