Stellar obliquities and planetary alignments (SOPA). I. Spin-orbit measurements of three transiting hot Jupiters: WASP-72b, WASP-100b, and WASP-109b

Addison, B. C. and Wang, Songhu and Johnson, M. C. and Tinney, C. G. and Wright, D. J. and Bayliss, D. (2018) Stellar obliquities and planetary alignments (SOPA). I. Spin-orbit measurements of three transiting hot Jupiters: WASP-72b, WASP-100b, and WASP-109b. The Astronomical Journal, 156:197. pp. 1-12. ISSN 0004-6256


Abstract

We report measurements of the sky-projected spin-orbit angles for three transiting hot Jupiters, two of which are in nearly polar orbits, WASP-100b and WASP-109b, and a third in a low-obliquity orbit, WASP-72b. We obtained these measurements by observing the Rossiter-McLaughlin effect over the course of the transits from high-resolution spectroscopic observations made with the CYCLOPS2 optical fiber bundle system feeding the UCLES spectrograph on the Anglo-Australian Telescope. The resulting sky-projected spin-orbit angles are lambda = 7 degrees(+11)(-12 degrees)degrees, lambda = 79 degrees(+19)(-10 degrees)degrees, and lambda = 99 degrees(+10)(-9 degrees)degrees for WASP-72b, WASP-100b, and WASP-109b, respectively. These results suggests that WASP-100b and WASP-109b are on highly inclined orbits tilted nearly 90 degrees from their host star's equator, while the orbit of WASP-72b appears to be well-aligned. WASP-72b is a typical hot Jupiter orbiting a mid-late F star (F7 with T-eff = 6250 +/- 120 K). WASP-100b and WASP-109b are highly irradiated bloated hot Jupiters orbiting hot early-mid F stars (F2 with T-eff = 6900 +/- 120 K and F4 with T-eff = 6520 +/- 140 K), making them consistent with the trends observed for the majority of stars hosting planets on high-obliquity orbits.


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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: 09 Sep 2019 02:51
Last Modified: 07 Jun 2021 00:21
Uncontrolled Keywords: planets and satellites, dynamical evolution and stability, stars, WASP-72, WASP-100, WASP-109, radial velocities
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
Identification Number or DOI: https://doi.org/10.3847/1538-3881/aade91
URI: http://eprints.usq.edu.au/id/eprint/36368

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