Gl 725A b: A Potential Super-Earth Detected With SOPHIE and SPIRou In An M Dwarf Binary System At 3.5 pc
We report the discovery of a super-Earth candidate orbiting the nearby mid M dwarf Gl 725A using the radial velocity (RV) method.
The planetary signal has been independently identified using high-precision RVs from the SOPHIE and SPIRou spectrographs, in the optical and near-infrared domains, respectively. We modelled the stellar activity signal jointly with the planet using two Gaussian Processes, one for each instrument to account for the chromaticity of the stellar activity and instrumental systematics, along with a Keplerian model.
The signal is significantly detected with a RV semi-amplitude of 1.67±0.20 m/s. The planet Gl 725A b is found to be in an orbit compatible with circular with a period of 11.2201±0.0051 days.
We analysed 27 sectors of TESS photometry on which no transit event was found. We determined a minimum mass of Mpsini=2.78±0.35M⊕ which places the planet in the super-Earth regime. Using Mass-Radius relationships we predict a planetary radius to be between 1.2 and 2.0R⊕.
The proximity of Gl 725A, of only 3.5 pc, makes this new exoplanet one of the closest to Earth and joins the group of S-type low-mass planets in short orbits (P<15 d) around close M dwarfs.
P. Cortes-Zuleta, I. Boisse, M. Ould-Elhkim, T. G. Wilson, P. Larue, A. Carmona, X. Delfosse, J.-F. Donati, T. Forveille, C. Moutou, A. Collier Cameron, E. Artigau, L. Acuña, L. Altinier, N. Astudillo-Defru, C. Baruteau, X. Bonfils, S. Cabrit, C. Cadieux, N. J. Cook, E. Decocq, R. F. Diaz, P. Fouque, J. Gomes da Silva, K. Grankin, S. Grouffal, N. Hara, G. Hebrard, N. Heidari, J. H. C. Martins, E. Martioli, M. Maurice, J. Scigliuto, J. Serrano Bell, S. Sulis, A. C. Petit, H. G. Vivien
Comments: 26 pages, 17 figures. Accepted in A&A
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2411.09506 [astro-ph.EP] (or arXiv:2411.09506v1 [astro-ph.EP] for this version)
https://doi.org/10.48550/arXiv.2411.09506
Focus to learn more
Submission history
From: Pía Cortés-Zuleta
[v1] Thu, 14 Nov 2024 15:17:50 UTC (12,730 KB)
https://arxiv.org/abs/2411.09506
Astrobiology,
