TOI-1842b: A Transiting Warm Saturn Undergoing Reinflation around an Evolving Subgiant

Robert A. Wittenmyer*, Jake T. Clark, Trifon Trifonov, Brett C. Addison, Duncan J. Wright, Keivan G. Stassun, Jonathan Horner, Nataliea Lowson, John Kielkopf, Stephen R. Kane, Peter Plavchan, Avi Shporer, Hui Zhang, Brendan P. Bowler, Matthew W. Mengel, Jack Okumura, Markus Rabus, Marshall C. Johnson, Daniel Harbeck, René TronsgaardLars A. Buchhave, Karen A. Collins, Kevin I. Collins, Tianjun Gan, Eric L. N. Jensen, Steve B. Howell, E. Furlan, Crystal L. Gnilka, Kathryn V. Lester, Rachel A. Matson, Nicholas J. Scott, George R. Ricker, Roland Vanderspek, David W. Latham, S. Seager, Joshua N. Winn, Jon M. Jenkins, Alexander Rudat, Elisa V. Quintana, David R. Rodriguez, Douglas A. Caldwell, Samuel N. Quinn, Zahra Essack, Luke G. Bouma

*Corresponding author for this work

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    Abstract

    The imminent launch of space telescopes designed to probe the atmospheres of exoplanets has prompted new efforts to prioritize the thousands of transiting planet candidates for follow-up characterization. We report the detection and confirmation of TOI-1842b, a warm Saturn identified by TESS and confirmed with ground-based observations from Minerva-Australis, NRES, and the Las Cumbres Observatory Global Telescope. This planet has a radius of RJ, a mass of MJ, an orbital period of days, and an extremely low density (ρ = 0.252 ± 0.091 g cm−3). TOI-1842b has among the best known combinations of large atmospheric scale height (893 km) and host-star brightness (J = 8.747 mag), making it an attractive target for atmospheric characterization. As the host star is beginning to evolve off the main sequence, TOI-1842b presents an excellent opportunity to test models of gas giant reinflation. The primary transit duration of only 4.3 hr also makes TOI-1842b an easily-schedulable target for further ground-based atmospheric characterization.
    Original languageEnglish
    Article number82
    JournalAstronomical Journal
    Volume163
    Issue number2
    Number of pages15
    ISSN0004-6256
    DOIs
    Publication statusPublished - 2022

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