TESS Giants Transiting Giants. II. the Hottest Jupiters Orbiting Evolved Stars

Samuel K. Grunblatt, Nicholas Saunders, Meng Sun, Ashley Chontos, Melinda Soares-Furtado, Nora Eisner, Filipe Pereira, Thaddeus Komacek, Daniel Huber, Karen Collins, Gavin Wang, Chris Stockdale, Samuel N. Quinn, Rene Tronsgaard, George Zhou, Grzegorz Nowak, Hans J. Deeg, David R. Ciardi, Andrew Boyle, Malena RiceFei Dai, Sarah Blunt, Judah Van Zandt, Corey Beard, Joseph M. Akana Murphy, Paul A. Dalba, Jack Lubin, Alex Polanski, Casey Lynn Brinkman, Andrew W. Howard, Lars A. Buchhave, Ruth Angus, George R. Ricker, Jon M. Jenkins, Bill Wohler, Robert F. Goeke, Alan M. Levine, Knicole D. Colon, Chelsea X. Huang, Michelle Kunimoto, Avi Shporer, David W. Latham, Sara Seager, Roland K. Vanderspek, Joshua N. Winn

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Giant planets on short-period orbits are predicted to be inflated and eventually engulfed by their host stars. However, the detailed timescales and stages of these processes are not well known. Here, we present the discovery of three hot Jupiters (P < 10 days) orbiting evolved, intermediate-mass stars (M ⋆ ≈ 1.5 M ⊙, 2 R ⊙ < R ⋆ < 5 R ⊙). By combining TESS photometry with ground-based photometry and radial velocity measurements, we report masses and radii for these three planets of between 0.4 and 1.8 M J and 0.8 and 1.8 R J. TOI-2337b has the shortest period (P = 2.99432 ± 0.00008 days) of any planet discovered around a red giant star to date. Both TOI-4329b and TOI-2669b appear to be inflated, but TOI-2337b does not show any sign of inflation. The large radii and relatively low masses of TOI-4329b and TOI-2669b place them among the lowest density hot Jupiters currently known, while TOI-2337b is conversely one of the highest. All three planets have orbital eccentricities of below 0.2. The large spread in radii for these systems implies that planet inflation has a complex dependence on planet mass, radius, incident flux, and orbital properties. We predict that TOI-2337b has the shortest orbital decay timescale of any planet currently known, but do not detect any orbital decay in this system. Transmission spectroscopy of TOI-4329b would provide a favorable opportunity for the detection of water, carbon dioxide, and carbon monoxide features in the atmosphere of a planet orbiting an evolved star, and could yield new information about planet formation and atmospheric evolution.

Original languageEnglish (US)
Article number120
JournalAstronomical Journal
Volume163
Issue number3
DOIs
StatePublished - Mar 1 2022

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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