Browsing by Author "Saunders, Nicholas"

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    TESS Giants Transiting Giants. I.: A Noninflated Hot Jupiter Orbiting a Massive Subgiant
    (2022) Saunders, Nicholas; Grunblatt, Samuel K.; Huber, Daniel; Collins, Karen A.; Jensen, Eric L. N.; Vanderburg, Andrew; Brahm, Rafael; Jordan, Andres; Espinoza, Nestor; Henning, Thomas; Hobson, Melissa J.; Quinn, Samuel N.; Zhou, George; Butler, R. Paul; Crause, Lisa; Kuhn, Rudi B.; Mogotsi, K. Moses; Hellier, Coel; Angus, Ruth; Hattori, Soichiro; Chontos, Ashley; Ricker, George R.; Jenkins, Jon M.; Tenenbaum, Peter; Latham, David W.; Seager, Sara; Vanderspek, Roland K.; Winn, Joshua N.; Stockdale, Chris; Cloutier, Ryan
    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-circle dot, R-* = 2.90 +/- 0.14 R-circle dot) 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.