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

Wang, Songhu and Winn, Joshua N. and Addison, Brett C. 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. Astronomical Journal, 162 (2). Art. No. 50. ISSN 0004-6256. doi:10.3847/1538-3881/ac0626.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Wang, Songhu0000-0002-7846-6981
Winn, Joshua N.0000-0002-4265-047X
Addison, Brett C.0000-0003-3216-0626
Dai, Fei0000-0002-8958-0683
Rice, Malena0000-0002-7670-670X
Holden, Bradford0000-0002-6153-3076
Burt, Jennifer A.0000-0002-0040-6815
Wang, Xian-Yu0000-0002-0376-6365
Butler, R. Paul0000-0003-1305-3761
Vogt, Steven S.0000-0001-7177-7456
Laughlin, Gregory0000-0002-3253-2621
Additional Information:© 2021. The American Astronomical Society. Received 2021 April 28; revised 2021 May 24; accepted 2021 May 26; published 2021 July 8. The authors thank Maximilian N. Güenther for helpful discussions on the Allesfitter and are also grateful to the anonymous referee for their constructive comments and suggestions. J.N.W. thanks the Heising-Simons Foundation for support. M.R. is supported by the National Science Foundation Graduate Research Fellowship Program under grant No. DGE-1752134. We are grateful to Metrics for providing helpful suggestions on the figure design. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (80NM0018D0004). This work is supported by China National Astronomical Data Center (NADC), Chinese Virtual Observatory (China-VO), Astronomical Big Data Joint Research Center, and cofounded by National Astronomical Observatories, Chinese Academy of Sciences, and Alibaba Cloud.
Funding AgencyGrant Number
Heising-Simons FoundationUNSPECIFIED
NSF Graduate Research FellowshipDGE-1752134
Subject Keywords:Exoplanets
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Exoplanets (498)
Record Number:CaltechAUTHORS:20210720-221345357
Persistent URL:
Official Citation:Songhu Wang et al 2021 AJ 162 50
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109942
Deposited By: Tony Diaz
Deposited On:21 Jul 2021 16:17
Last Modified:21 Jul 2021 16:17

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