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

Wittenmyer, Robert A. and Clark, Jake T. and Trifonov, Trifon and Addison, Brett C. ORCID: https://orcid.org/0000-0003-3216-0626 and Wright, Duncan J. ORCID: https://orcid.org/0000-0001-7294-5386 and Stassun, Keivan G. and Horner, Jonathan and Lowson, Nataliea and Kielkopf, John and Kane, Stephen R. and Plavchan, Peter and Shporer, Avi and Zhang, Hui and Bowler, Brendan P. and Mengel, Matthew W. ORCID: https://orcid.org/0000-0002-7830-6822 and Okumura, Jack and Rabus, Markus and Johnson, Marshall C. and Harbeck, Daniel and Tronsgaard, Rene and Buchhave, Lars A. and Collins, Karen A. and Collins, Kevin I. and Gan, Tianjun and Jensen, Eric L. N. and Howell, Steve B. and Furlan, E. and Gnilka, Crystal L. and Lester, Kathryn V. and Matson, Rachel A. and Scott, Nicholas J. and Ricker, George R. and Vanderspek, Roland and Latham, David W. and Seager, S. and Winn, Joshua N. and Jenkins, Jon M. and Rudat, Alexander and Quintana, Elisa V. and Rodriguez, David R. and Caldwell, Douglas A. and Quinn, Samuel N. and Essack, Zahra and Bouma, Luke G. (2022) TOI-1842b: A Transiting Warm Saturn Undergoing Reinflation around an Evolving Subgiant. Astronomical Journal, 163 (2):82. pp. 1-15. ISSN 0004-6256

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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 R J, a mass of M J, an orbital period of days, and an extremely low density (? = 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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
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: 18 Jul 2022 00:13
Last Modified: 26 Aug 2022 00:44
Uncontrolled Keywords: Exoplanet detection methods (489); Transit photometry (1709); Radial velocity (1332); Extrasolar gaseous giant planets (509); Astrophysics - Earth and Planetary Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
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/ac3f39
URI: http://eprints.usq.edu.au/id/eprint/49478

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