SIMBAD references

2023A&A...671A.164K - Astronomy and Astrophysics, volume 671A164 (2023/3-1)

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

KNUDSTRUP E., ALBRECHT S.H., GANDOLFI D., MARCUSSEN M.L., GOFFO E., SERRANO L.M., DAI F., REDFIELD S., HIRANO T., CSIZMADIA S., COCHRAN W.D., DEEG H.J., FRIDLUND M., LAM K.W.F., LIVINGSTON J.H., LUQUE R., NARITA N., PALLE E., PERSSON C.M. and VAN EYLEN V.

Abstract (from CDS):

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+0.07R⋆. 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.

Abstract Copyright: © The Authors 2023

Journal keyword(s): planet-star interactions - techniques: photometric - techniques: spectroscopic - planets and satellites: gaseous planets

Simbad objects: 5

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