Spin-orbit alignment for three transiting hot Jupiters: WASP-103b, WASP-87b, and WASP-66b

Addison, B. C. and Tinney, C. G. and Wright, D. J. and Bayliss, D. (2016) Spin-orbit alignment for three transiting hot Jupiters: WASP-103b, WASP-87b, and WASP-66b. The Astrophysical Journal, 823 (29). pp. 1-16. ISSN 0004-6256

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Abstract

We have measured the sky-projected spin-orbit alignments for three transiting hot Jupiters, WASP-103b, WASP-87b, and WASP-66b, using spectroscopic measurements of the Rossiter-McLaughlin effect, with the CYCLOPS2 optical fiber bundle system feeding the UCLES spectrograph on the Anglo-Australian Telescope. The resulting sky-projected spin-orbit angles of lambda = 3 degrees +/- 33 degrees, lambda- = -8 degrees +/- 11 degrees, and lambda- = -4 degrees +/- 22 degrees for WASP-103b, WASP-87b, and WASP-66b, respectively, suggest that these three planets are likely on nearly aligned orbits with respect to their host star's spin axis. WASP-103 is a particularly interesting system as its orbital distance is only 20% larger than its host star's Roche radius and the planet likely experiences strong tidal effects. WASP-87 and WASP-66 are hot (T-eff = 6450 +/- 120 K and T-eff = 6600 +/- 150 K, respectively) mid-F stars, making them similar to the majority of stars hosting planets on high-obliquity orbits. Moderate spin-orbit misalignments for WASP-103b and WASP-66b are consistent with our data, but polar and retrograde orbits are not favored for these systems.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences (1 July 2013 - 5 Sept 2019)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences (1 July 2013 - 5 Sept 2019)
Date Deposited: 04 Sep 2019 00:20
Last Modified: 10 Sep 2019 02:58
Uncontrolled Keywords: planets and satellites dynamical evolution and stability, stars individual WASP-103, WASP-87, WASP-66, techniques radial velocities
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Identification Number or DOI: 10.3847/0004-637X/823/1/29
URI: http://eprints.usq.edu.au/id/eprint/36367

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