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A puffy polar planet: The low density, hot Jupiter TOI-640 b is on a polar orbit

Knudstrup, E; Albrecht, SH; Gandolfi, D; Marcussen, ML; Goffo, E; Serrano, LM; Dai, F; ... Van Eylen, V; + view all (2023) A puffy polar planet: The low density, hot Jupiter TOI-640 b is on a polar orbit. Astronomy and Astrophysics , 671 , Article A164. 10.1051/0004-6361/202245301. Green open access

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Abstract

TOI-640 b is a hot, puffy Jupiter with a mass of 0.57 ± 0.02 MJ and radius of 1.72 ± 0.05 RJ, orbiting a slightly evolved F-type star with a separation of 6.33- 0.06+0.07 R∗. Through spectroscopic in-transit observations made with the HARPS spectrograph, we measured the Rossiter-McLaughlin effect, analysing both in-transit radial velocities and the distortion of the stellar spectral lines. From these observations, we find the host star to have a projected obliquity of λ = 184 ± 3. From the TESS light curve, we measured the stellar rotation period, allowing us to determine the stellar inclination, i∗ = 23- 2+3, meaning we are viewing the star pole-on. Combining this with the orbital inclination allowed us to calculate the host star obliquity, Ï = 104 ± 2°. TOI-640 b joins a group of planets orbiting over stellar poles within the range 80°-125°. The origin of this orbital configuration is not well understood.

Type: Article
Title: A puffy polar planet: The low density, hot Jupiter TOI-640 b is on a polar orbit
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/0004-6361/202245301
Publisher version: https://doi.org/10.1051/0004-6361/202245301
Language: English
Additional information: Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This article is published in open access under the Subscribe to Open model. Subscribe to A&A to support open access publication.
Keywords: Planet-star interactions, techniques: photometric, techniques: spectroscopic, planets and satellites: gaseous planets
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10168284
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