A temperate super-Earth detected by precise radial velocities around a nearby star

DÍAZ, RODRIGO F.

São Paulo

Workshop; Precision Spectroscopy 21. Stellar connections: from Galaxy evolution to exoplanets; 2021

Nearby exoplanetary system play a key role in our understanding of these bodies. They will be prime targets for detailed spectroscopic characterisation of their atmospheres with future observational facilities. Here, I present the recent detection of a temperate super-Earth around the nearby M-dwarf star Gliese 411 (Lalande 21185) using radial velocity measurements acquired with the SOPHIE high-resolution spectrograph. The planet has an orbital period of 12.95 days and a minimum mass of around three Earth masses. The planet receives about 3.5 times the insolation received by Earth, which implies an equilibrium temperature between 256 and 350 K, and makes it too hot to be in the habitable zone. Very recently, the detection has been confirmed by the CARMENES exoplanet search team. At a distance of only 2.5 pc, Gl 411 b, is the third closest low-mass planet detected to date. Its proximity to Earth will permit probing its atmosphere with a combination of high-contrast imaging and high-dispersion spectroscopy in the next decade.