Testing the Planet-Metallicity Correlation in M-dwarfs with Gemini GNIRS Spectra
Abstract
While the planet-metallicity correlation for FGK main-sequence stars hosting giant planets is well established, it is less clear for M-dwarf stars. We determine stellar parameters and metallicities for 16 M-dwarf stars, 11 of which host planets, with near-infrared spectra from the Gemini Near-Infrared Spectrograph (GNIRS). We find that M-dwarfs with planets are preferentially metal-rich compared to those without planets. This result is supported by the analysis of a larger catalogue of 18 M stars with planets and 213 M stars without known planets T15, and demonstrates the utility of GNIRS spectra to obtain reliable stellar parameters of M stars. We also find that M dwarfs with giant planets are preferentially more metallic than those with low-mass planets, in agreement with previous results for solar-type stars. These results favor the core accretion model of planetary formation.
- Publication:
-
Revista Mexicana de Astronomia y Astrofisica
- Pub Date:
- April 2018
- DOI:
- 10.48550/arXiv.1711.04878
- arXiv:
- arXiv:1711.04878
- Bibcode:
- 2018RMxAA..54...65H
- Keywords:
-
- methods: observational;
- planets and satellites: general;
- stars: abundances;
- techniques: spectroscopic;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- 37 pages, 8 figures, Accepted for publication in RMxAA