Effective temperatures of low-mass stars from high-resolution H-band spectroscopy
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Published version
Date
2019-07-11
Authors
López-Valdivia, Ricardo
Mace, Gregory N.
Sokal, Kimberly R.
Hussaini, Maryam
Kidder, Benjamin T.
Mann, Andrew W.
Gosnell, Natalie M.
Oh, Heeyoung
Kesseli, Aurora Y.
Muirhead, Philip S.
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Published version
OA Version
Citation
Ricardo López-Valdivia, Gregory N. Mace, Kimberly R. Sokal, Maryam Hussaini, Benjamin T. Kidder, Andrew W. Mann, Natalie M. Gosnell, Heeyoung Oh, Aurora Y. Kesseli, Philip S. Muirhead, Christopher M. Johns-Krull, Daniel T Jaffe. 2019. "Effective Temperatures of Low-mass Stars from High-resolution H-band Spectroscopy." The Astrophysical Journal, Volume 879, Issue 2, pp. 105 - 105. https://doi.org/10.3847/1538-4357/ab2129
Abstract
High-resolution, near-infrared spectra will be the primary tool for finding and characterizing Earth-like planets around low-mass stars. Yet, the properties of exoplanets cannot be precisely determined without accurate and precise measurements of the host star. Spectra obtained with the Immersion Grating Infrared Spectrometer simultaneously provide diagnostics for most stellar parameters, but the first step in any analysis is the determination of the effective temperature. Here we report the calibration of high-resolution H-band spectra to
accurately determine the effective temperature for stars between 4000 and 3000 K (∼K8–M5) using absorption line-depths of Fe I, OH, and Al I. The field star sample used here contains 254 K and M stars with temperatures derived using BT-Settl synthetic spectra. We use 106 stars with precise temperatures in the literature to calibrate
our method, with typical errors of about 140 K, and systematic uncertainties less than ∼120 K. For the broadest applicability, we present Teff–line-depth-ratio relationships, which we test on 12 members of the TW Hydrae Association and at spectral resolving powers between ∼10,000 and 120,000. These ratios offer a simple but
accurate measure of effective temperatures in cool stars that are distance and reddening independent.
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© 2019 The American Astronomical Society.