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TESS Giants Transiting Giants. III : an eccentric warm Jupiter supports a period-eccentricity relation for giant planets transiting evolved stars
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(2023) TESS Giants Transiting Giants. III : an eccentric warm Jupiter supports a period-eccentricity relation for giant planets transiting evolved stars. The Astronomical Journal, 165 (2). 44. doi:10.3847/1538-3881/aca670 ISSN 0004-6256.
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Official URL: https://doi.org/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 ${0.94}_{-0.12}^{+0.09}$ RJ, 0.53 ± 0.05 MJ 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.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Extrasolar planets, Stars -- Evolution, Transits | ||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | The Astronomical Journal | ||||||||||||||||||||||||||||||||||||
Publisher: | Institute of Physics Publishing, Inc. | ||||||||||||||||||||||||||||||||||||
ISSN: | 0004-6256 | ||||||||||||||||||||||||||||||||||||
Official Date: | 10 January 2023 | ||||||||||||||||||||||||||||||||||||
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Volume: | 165 | ||||||||||||||||||||||||||||||||||||
Number: | 2 | ||||||||||||||||||||||||||||||||||||
Article Number: | 44 | ||||||||||||||||||||||||||||||||||||
DOI: | 10.3847/1538-3881/aca670 | ||||||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 16 December 2022 | ||||||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 7 February 2023 | ||||||||||||||||||||||||||||||||||||
Funder: | STFC via an Ernest Rutherford Fellowship (ST/P003850/1) | ||||||||||||||||||||||||||||||||||||
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