TESS Giants Transiting Giants. III. An Eccentric Warm Jupiter Supports a Period − Eccentricity Relation for Giant Planets Transiting Evolved Stars
Article
Article Title | TESS Giants Transiting Giants. III. An Eccentric Warm Jupiter Supports a Period − Eccentricity Relation for Giant Planets Transiting Evolved Stars |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Grunblatt, Samuel K., Saunders, Nicholas, Chontos, Ashley, Hattori, Soichiro, Veras, Dimitri, Huber, Daniel, Angus, Ruth, Rice, Malena, Breivik, Katelyn, Blunt, Sarah and Isaacson, Howard |
Journal Title | The Astronomical Journal |
Journal Citation | 165 (2) |
Number of Pages | 15 |
Year | 2023 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/aca670 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/aca670 |
Abstract | The fate of planets around rapidly evolving stars is not well understood. Previous studies have suggested that, relative to the main-sequence population, planets transiting evolved stars (P < 100 days) tend to have more eccentric orbits. Here we present the discovery of TOI-4582 b, a 0.94 − 0.12 + 0.09 R J , 0.53 ± 0.05 M J planet orbiting an intermediate-mass subgiant star every 31.034 days. We find that this planet is also on a significantly eccentric orbit (e = 0.51 ± 0.05). We then compare the population of planets found transiting evolved (log g < 3.8) stars to the population of planets transiting main-sequence stars. We find that the rate at which median orbital eccentricity grows with period is significantly higher for evolved star systems than for otherwise similar main-sequence systems. In general, we observe that mean planet eccentricity 〈e〉 = a+blog10(P) for the evolved population with significant orbital eccentricity where a = −0.18 ± 0.08 and b = 0.38 ± 0.06, significantly distinct from the main-sequence planetary system population. This trend is seen even after controlling for stellar mass and metallicity. These systems do not appear to represent a steady evolution pathway from eccentric, long-period planetary orbits to circular, short-period orbits, as orbital model comparisons suggest that inspiral timescales are uncorrelated with orbital separation or eccentricity. Characterization of additional evolved planetary systems will distinguish effects of stellar evolution from those of stellar mass and composition. |
Keywords | Exoplanets (498); Stellar evolution (1599); Star-planet interactions (2177); Transits (1711); Extrasolar gaseous giant planets (509) |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | American Museum of Natural History, United States |
Flatiron Institute, United States | |
University of Hawaii, United States | |
Princeton University, United States | |
Columbia University, United States | |
University of Warwick, United Kingdom | |
Massachusetts Institute of Technology, United States | |
Yale University, United States | |
California Institute of Technology (Caltech), United States | |
University of California Berkeley, United States | |
Centre for Astrophysics |
https://research.usq.edu.au/item/z25x9/tess-giants-transiting-giants-iii-an-eccentric-warm-jupiter-supports-a-period-eccentricity-relation-for-giant-planets-transiting-evolved-stars
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