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Table · dataset · 2022

Gl514 RVs and activity diagnostics

Listed in IVOA Registry (Virtual Observatory)

Statistical analyses based on Kepler data show that most of the early-type M dwarfs host multi-planet systems consisting of Earth to sub-Neptune sized planets with orbital periods up to ~250 days, and that at least one such planet is likely located within the habitable zone.

Description

M dwarfs are therefore primary targets to search for potentially habitable planets in the solar neighbourhood. We investigated the presence of planetary companions around the nearby (7.6pc) and bright (V=9mag) early-type M dwarf Gl 514, analysing 540 radial velocities collected over nearly 25 years with the HIRES, HARPS, and CARMENES spectrographs.

The data are affected by time-correlated signals at the level of 2-3m/s due to stellar activity, that we filtered out testing three different models based on Gaussian process regression. As a sanity cross-check, we repeated the analyses using HARPS radial velocities extracted with three different algorithms. We used HIRES radial velocities and Hipparcos-Gaia astrometry to put constraints on the presence of long-period companions, and we analysed TESS photometric data.

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We found strong evidence that Gl~514 hosts a super-Earth on a likely eccentric orbit, residing in the conservative habitable zone for nearly 34% of its orbital period. The planet Gl 514 b has minimum mass m_b_sini_b_=5.2+/-0.9M_{sun}_, orbital period P_b_=140.43+/-0.41 days, and eccentricity e_b_=0.45^+0.15^_-0.14_. No evidence for transits is found in the TESS light curve.

There is no evidence for a longer period companion in the radial velocities and, based on astrometry, we can rule out a ~0.2M_{Jup}_ planet at a distance of ~3-10au, and massive giant planets/brown dwarfs out to several tens of au. We discuss the possible presence of a second low-mass companion at a shorter distance from the host than Gl 514 b. Gl 514 b represents an interesting science case to study the habitability of planets on eccentric orbits.

We advocate for additional spectroscopic follow-up to get more accurate and precise planetary parameters. Further follow-up is also needed to investigate sub m/s and shorter period signals.

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