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
Referencia bibliográfica

Astronomy and Astrophysics

Fecha de publicación:
3
2023
Revista
Astronomy and Astrophysics
Número de autores
20
Número de autores del IAC
3
Número de citas
4
Número de citas referidas
3
Descripción
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.
Proyectos relacionados
Image withthe projects' name
Exoplanetas y Astrobiología
La búsqueda de vida en el Universo se ha visto impulsada por los recientes descubrimientos de planetas alrededor de otras estrellas (los llamados exoplanetas), convirtiéndose en uno de los campos más activos dentro de la Astrofísica moderna. En los últimos años los descubrimientos cada vez más numerosos de nuevos exoplanetas y los últimos avances
Enric
Pallé Bago
En ejecución
Tipo
Con árbitro
Sistema Solar y Sistemas Planetarios (SEYSS)
Técnicas

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