The Aligned Orbit of the Eccentric Warm Jupiter K2-232b

Wang, Songhu and Winn, Joshua N. and Addison, Brett C. ORCID: https://orcid.org/0000-0003-3216-0626 and Dai, Fei and Rice, Malena and Holden, Bradford and Burt, Jennifer A. and Wang, Xian-Yu and Butler, R. Paul and Vogt, Steven S. and Laughlin, Gregory (2021) The Aligned Orbit of the Eccentric Warm Jupiter K2-232b. The Astronomical Journal, 162 (2):50. pp. 1-6. ISSN 0004-6256

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Abstract

Measuring the obliquity distribution of stars hosting warm Jupiters may help us to understand the formation of close-orbiting gas giants. Few such measurements have been performed due to practical difficulties in scheduling observations of the relatively infrequent and long-duration transits of warm Jupiters. Here, we report a measurement of the Rossiter-McLaughlin effect for K2-232 b, a warm Jupiter on an 11.17 day orbit with an eccentricity of 0.26. The data were obtained with the Automated Planet Finder during two separate transits. The planet's orbit appears to be well aligned with the spin axis of the host star, with a projected spin-orbit angle of λ = -11.°1 ± 6.°6. Combined with the other available data, we find that high obliquities are almost exclusively associated with planets that either have an orbital separation greater than 10 stellar radii or orbit stars with effective temperatures hotter than 6000 K. This pattern suggests that the obliquities of the closest-orbiting giant planets around cooler stars have been damped by tidal effects.


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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: 17 Dec 2021 01:49
Last Modified: 22 Dec 2021 04:05
Uncontrolled Keywords: Extrasolar planets; Spin; Star; Binary; Retrograde; Alignment; Evolution; Rotation; Exoplanets; 498; Astrophysics - Earth and Planetary Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.3847/1538-3881/ac0626
URI: http://eprints.usq.edu.au/id/eprint/44812

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