SIMBAD references

2012ApJ...747L..38T - Astrophys. J., 747, L38 (2012/March-2)

An h-band spectroscopic metallicity calibration for M dwarfs.

TERRIEN R.C., MAHADEVAN S., BENDER C.F., DESHPANDE R., RAMSEY L.W. and BOCHANSKI J.J.

Abstract (from CDS):

We present an empirical near-infrared (NIR) spectroscopic method for estimating M dwarf metallicities, based on features in the H band, as well as an implementation of a similar published method in the K band. We obtained R ∼ 2000 NIR spectra of a sample of M dwarfs using the NASA IRTF-SpeX spectrograph, including 22 M dwarf metallicity calibration targets that have FGK companions with known metallicities. The H-band and K-band calibrations provide equivalent fits to the metallicities of these binaries, with an accuracy of ±0.12 dex. We derive the first empirically calibrated spectroscopic metallicity estimate for the giant planet-hosting M dwarf GJ 317, confirming its supersolar metallicity. Combining this result with observations of eight other M dwarf planet hosts, we find that M dwarfs with giant planets are preferentially metal-rich compared to those that host less massive planets. Our H-band calibration relies on strongly metallicity-dependent features in the H band, which will be useful in compositional studies using mid- to high-resolution NIR M dwarf spectra, such as those produced by multiplexed surveys like SDSS-III APOGEE. These results will also be immediately useful for ongoing spectroscopic surveys of M dwarfs.

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Journal keyword(s): planetary systems - stars: abundances - stars: late-type - techniques: spectroscopic

Simbad objects: 54

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