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

Bibcode
2023A&A...671A.164K
DOI
10.1051/0004-6361/202245301
Knudstrup, Emil; Albrecht, Simon H.; Gandolfi, Davide; Marcussen, Marcus L.; Goffo, Elisa; Serrano, Luisa M.; Dai, Fei; Redfield, Seth; Hirano, Teruyuki; Csizmadia, Szilárd; Cochran, William D.; Deeg, Hans J.; Fridlund, Malcolm; Lam, Kristine W. F.; Livingston, John H.; Luque, Rafael; Narita, Norio; Palle, Enric; Persson, Carina M.; Van Eylen, Vincent
Bibliographical reference

Astronomy and Astrophysics

Advertised on:
3
2023
Journal
Astronomy and Astrophysics
Number of authors
20
IAC number of authors
3
Citations
2
Refereed citations
2
Description
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, ψ = 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.
Related projects
Projects' name image
Exoplanets and Astrobiology

The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable

Enric
Pallé Bago
In progress
Type
Refereed
Techniques
Exoplanetary Systems & Solar System (SEYSS)

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