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WASP-131 b with ESPRESSO I : a bloated sub-Saturn on a polar orbit around a differentially rotating solar-type star
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(2023) WASP-131 b with ESPRESSO I : a bloated sub-Saturn on a polar orbit around a differentially rotating solar-type star. Monthly Notices of the Royal Astronomical Society, 522 (3). pp. 4499-4514. doi:10.1093/mnras/stad1240 ISSN 1745-3933.
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WRAP-WASP-131-b-ESPRESSO-I-bloated-sub-Saturn-polar-orbit-differentially-rotating-solar-type-star-2023.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (3573Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stad1240
Abstract
In this paper, we present observations of two high-resolution transit datasets obtained with ESPRESSO of the bloated sub-Saturn planet WASP-131 b. We have simultaneous photometric observations with NGTS and EulerCam. In addition, we utilised photometric lightcurves from TESS, WASP, EulerCam and TRAPPIST of multiple transits to fit for the planetary parameters and update the ephemeris. We spatially resolve the stellar surface of WASP-131 utilising the Reloaded Rossiter McLaughlin technique to search for centre-to-limb convective variations, stellar differential rotation, and to determine the star-planet obliquity for the first time. We find WASP-131 is misaligned on a nearly retrograde orbit with a projected obliquity of $\lambda = 162.4\substack{+1.3 \\-1.2}^{\circ }$. In addition, we determined a stellar differential rotation shear of α = 0.61 ± 0.06 and disentangled the stellar inclination ($i_* = 40.9\substack{+13.3 \\-8.5}^{\circ }$) from the projected rotational velocity, resulting in an equatorial velocity of $v_{\rm {eq}} = 7.7\substack{+1.5 \\-1.3}$ km s−1. In turn, we determined the true 3D obliquity of $\psi = 123.7\substack{+12.8 \\-8.0}^{\circ }$, meaning the planet is on a perpendicular/polar orbit. Therefore, we explored possible mechanisms for the planetary system’s formation and evolution. Finally, we searched for centre-to-limb convective variations where there was a null detection, indicating that centre-to-limb convective variations are not prominent in this star or are hidden within red noise.
Item Type: | Journal Article | |||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||||||||
SWORD Depositor: | Library Publications Router | |||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Convection (Astrophysics), Extrasolar planets -- Atmopsheres, F stars -- Motion in line of sight, Stars | |||||||||||||||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||||||||||||||||||||
Publisher: | Oxford University Press | |||||||||||||||||||||||||||||||||
ISSN: | 1745-3933 | |||||||||||||||||||||||||||||||||
Official Date: | July 2023 | |||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 522 | |||||||||||||||||||||||||||||||||
Number: | 3 | |||||||||||||||||||||||||||||||||
Page Range: | pp. 4499-4514 | |||||||||||||||||||||||||||||||||
DOI: | 10.1093/mnras/stad1240 | |||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 27 June 2023 | |||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 27 June 2023 | |||||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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