Metallicities of M Dwarf Planet Hosts from Spectral Synthesis - INSPIRE

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Metallicities of M Dwarf Planet Hosts from Spectral Synthesis

Nov, 2006

13 pages

Published in:

Astrophys.J.Lett. 653 (2006) L65-L68

e-Print:

astro-ph/0611060 [astro-ph]

DOI:

10.1086/510527

View in:

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Abstract: (arXiv)

We present the first spectroscopic metallicities of three M dwarfs with known or candidate planetary mass companions. We have analyzed high resolution, high signal-to-noise spectra of these stars which we obtained at McDonald Observatory. Our analysis technique is based on spectral synthesis of atomic and molecular features using recently revised cool-star model atmospheres and spectrum synthesis code. The technique has been shown to yield results consistent with the analyses of solar-type stars and allows measurements of M dwarf [M/H] values to 0.12 dex precision. From our analysis, we find [M/H] = -0.12, -0.32, and -0.33 for GJ 876, GJ 436, and GJ 581 respectively. These three M dwarf planet hosts have sub-solar metallicities, a surprising departure from the trend observed in FGK-type stars. This study is the first part of our ongoing work to determine the metallicities of the M dwarfs included in the McDonald Observatory planet search program.

planetary systems
stars: abundances
stars: individual (GJ 436, GJ 581, GJ 876)
stars: late-type

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