TESS Giants Transiting Giants. I.: A Noninflated Hot Jupiter Orbiting a Massive Subgiant

Saunders, Nicholas and Grunblatt, Samuel K. and Huber, Daniel and Collins, Karen A. and Jensen, Eric L. N. and Vanderburg, Andrew and Brahm, Rafael and Jordan, Andres and Espinoza, Nestor and Henning, Thomas and Hobson, Melissa J. and Quinn, Samuel N. and Zhou, George ORCID: https://orcid.org/0000-0002-4891-3517 and Butler, R. Paul and Crause, Lisa and Kuhn, Rudi B. and Moses Mogotsi, K. and Hellier, Coel and Angus, Ruth and Hattori, Soichiro and Chontos, Ashley and Ricker, George R. and Jenkins, Jon M. and Tenenbaum, Peter and Latham, David W. and Seager, Sara and Vanderspek, Roland K. and Winn, Joshua N. and Stockdale, Chris and Cloutier, Ryan (2022) TESS Giants Transiting Giants. I.: A Noninflated Hot Jupiter Orbiting a Massive Subgiant. The Astronomical Journal, 163 (2):53. pp. 1-15. ISSN 0004-6256

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Abstract

While the population of confirmed exoplanets continues to grow, the sample of confirmed transiting planets around evolved stars is still limited. We present the discovery and confirmation of a hot Jupiter orbiting TOI-2184 (TIC 176956893), a massive evolved subgiant (M ∗ = 1.53 ± 0.12 M o˙, R ∗ = 2.90 ± 0.14 R o˙) in the Transiting Exoplanet Survey Satellite (TESS) Southern Continuous Viewing Zone. The planet was flagged as a false positive by the TESS Quick-Look Pipeline due to periodic systematics introducing a spurious depth difference between even and odd transits. Using a new pipeline to remove background scattered light in TESS Full Frame Image data, we combine space-based TESS photometry, ground-based photometry, and ground-based radial velocity measurements to report a planet radius of R p = 1.017 ± 0.051 R J and mass of M p = 0.65 ± 0.16 M J . For a planet so close to its star, the mass and radius of TOI-2184b are unusually well matched to those of Jupiter. We find that the radius of TOI-2184b is smaller than theoretically predicted based on its mass and incident flux, providing a valuable new constraint on the timescale of post-main-sequence planet inflation. The discovery of TOI-2184b demonstrates the feasibility of detecting planets around faint (TESS magnitude > 12) post-main-sequence stars and suggests that many more similar systems are waiting to be detected in the TESS FFIs, whose confirmation may elucidate the final stages of planetary system evolution.


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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: 12 May 2022 05:02
Last Modified: 09 Jun 2022 03:40
Uncontrolled Keywords: Exoplanet astronomy (486); Exoplanet evolution (491); Exoplanets (498); Stellar evolution (1599); Late stellar evolution (911); Red giant stars (1372); Red giant branch (1368); Subgiant stars (1646); Space telescopes (1547); Transit photometry (1709); Exoplanet detection methods (489); Transits (1711); 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
Funding Details:
Identification Number or DOI: https://doi.org/10.3847/1538-3881/ac38a1
URI: http://eprints.usq.edu.au/id/eprint/48446

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