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- W4367000400 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 $lambda = 162.4substack{+1.3 -1.2}^{circ}$. In addition, we determined a stellar differential rotation shear of $alpha = 0.61 pm 0.06$ and disentangled the stellar inclination ($i_* = 40.9substack{+13.3 -8.5}^{circ}$) from the projected rotational velocity, resulting in an equatorial velocity of $v_{rm{eq}} = 7.7substack{+1.5 -1.3}$~km s$^{-1}$. In turn, we determined the true 3D obliquity of $psi = 123.7substack{+12.8 -8.0}^{circ}$, 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." @default.
- W4367000400 created "2023-04-27" @default.
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- W4367000400 date "2023-04-24" @default.
- W4367000400 modified "2023-10-01" @default.
- W4367000400 title "WASP-131 b with ESPRESSO I: A bloated sub-Saturn on a polar orbit around a differentially rotating solar-type star" @default.
- W4367000400 doi "https://doi.org/10.48550/arxiv.2304.12163" @default.
- W4367000400 hasPublicationYear "2023" @default.
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