A sub-Neptune planet around TOI-1695 discovered and characterized with SPIRou and TESS - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2023

A sub-Neptune planet around TOI-1695 discovered and characterized with SPIRou and TESS

Leandro de Almeida

Résumé

TOI-1695 is a V-mag = 13 M-dwarf star from the northern hemisphere at 45 pc from the Sun, around which a 3.134-day periodic transit signal from a super-Earth candidate was identified in TESS photometry. With a transit depth of 1.3 mmag, the radius of candidate TOI-1695.01 was estimated by the TESS pipeline to be 1.82 R with an equilibrium temperature of ~620 K. We successfully detected a reflex motion of the star and establish that it is due to a planetary companion at an orbital period consistent with the photometric transit period, thanks to a year-long radial-velocity monitoring of TOI-1695 by the SPIRou infrared spectropolarimeter. We used and compared different methods to reduce and analyze those data. We report a 5.5 detection of the planetary signal, giving a mass of 5.5±1.0 M and a radius of 2.03±0.18 R. We derive a mean equilibrium planet temperature of 590±90 K. The mean density of this small planet of 3.6±1.1 g cm3 is similar (1.7 lower) than that of the Earth. It leads to a nonnegligible fraction of volatiles in its atmosphere with fH,He = 0.280.23+0.46% or fwater = 23±12%. TOI-1695 b is a new sub-Neptune planet at the border of the M-dwarf radius valley that can help test formation scenarios for super-Earth and sub-Neptune-like planets.
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hal-04069281 , version 1 (06-06-2023)

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Flavien Kiefer, Guillaume H. Hébrard, Eder Martioli, Étienne Artigau, René Doyon, et al.. A sub-Neptune planet around TOI-1695 discovered and characterized with SPIRou and TESS. Astronomy and Astrophysics - A&A, 2023, 670, A136 (28p.). ⟨10.1051/0004-6361/202245129⟩. ⟨hal-04069281⟩
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