M dwarf luminosity, radius, and $\alpha$-enrichment from $I$-band spectral features

Abstract

Despite the ubiquity of M dwarfs and their growing importance to studies of exoplanets, Galactic evolution, and stellar structure, methods for precisely measuring their fundamental stellar properties remain elusive. Existing techniques for measuring M dwarf luminosity, mass, radius, or composition are calibrated over a limited range of stellar parameters or require expensive observations. We find a strong correlation between the $K_S$-band luminosity ($M_K$), the observed strength of the $I$-band sodium doublet absorption feature, and [Fe/H] in M dwarfs without strong H$\alpha$ emission. We show that the strength of this feature, coupled with [Fe/H] and spectral type, can be used to derive M dwarf $M_K$ and radius without requiring parallax. Additionally, we find promising evidence that the strengths of the $I$-band sodium doublet and the nearby $I$-band calcium triplet may jointly indicate $\alpha$-element enrichment. The use of these $I$-band features requires only moderate-resolution near-infrared spectroscopy to provide valuable information about the potential habitability of exoplanets around M dwarfs, and surface gravity and distance for M dwarfs throughout the Galaxy. This technique has immediate applicability for both target selection and candidate planet host system characterization for exoplanet missions such as \textit{TESS} and \textit{K2}.

arXiv commentAccepted to ApJ Letters

References in corpus (33)

• Validation of the new Hipparcos reduction
• The Dartmouth Stellar Evolution Database
• Accurate masses and radii of normal stars: modern results and applications
• The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)
• GAIA: Composition, Formation and Evolution of the Galaxy
• Stellar Diameters and Temperatures II. Main Sequence K & M Stars
• Metallicity and Temperature Indicators in M dwarf K band Spectra: Testing New & Updated Calibrations With Observations of 133 Solar Neighborhood M dwarfs
• The Palomar/MSU Nearby Star Spectroscopic Survey III: Chromospheric Activity, M-dwarf Ages and the Local Star Formation History
• Spectroscopic Properties of Cool Stars in the SDSS: An Analysis of Magnetic Activity and a Search for Subdwarfs
• The Sloan Digital Sky Survey Data Release 7 Spectroscopic M Dwarf Catalog I: Data
• Trumpeting M Dwarfs with CONCH-SHELL: a Catalog of Nearby Cool Host-Stars for Habitable ExopLanets and Life
• Near-infrared Metallicities, Radial Velocities and Spectral Types for 447 Nearby M Dwarfs
• Spectro-Thermometry of M dwarfs and their candidate planets: too hot, too cool, or just right?
• Prospecting in late-type dwarfs: a calibration of infrared and visible spectroscopic metallicities of late-K and M dwarfs spanning 1.5 dex
• On the Metal-Richness of M Dwarfs with Planets
• An observational correlation between stellar brightness variations and surface gravity
• Astrophysical Parameters and Habitable Zone of the Exoplanet Hosting Star GJ 581
• Metallicity measurements using atomic lines in M and K dwarf stars
• An Empirical Correction for Activity Effects on the Temperatures, Radii, and Estimated Masses of Low-Mass Stars and Brown Dwarfs
• An H-band Spectroscopic Metallicity Calibration for M Dwarfs
• An empirical calibration to estimate cool dwarf fundamental parameters from H-band spectra
• New Hipparcos-based Parallaxes for 424 Dim Stars
• Prospecting in Ultracool Dwarfs: Measuring the Metallicities of Mid- and Late-M Dwarfs
• Trigonometric Parallaxes for 1,507 Nearby Mid-to-Late M-dwarfs
• The Near Infrared NaI Doublet Feature in M Stars
• Spectroscopic characterization of 78 DENIS ultracool dwarf candidates in the solar neighborhood and the Upper Sco OB association
• The Na 8200 Angstrom Doublet as an Age Indicator in Low-Mass Stars
• Astrometry and radial velocities of the planet host M dwarf GJ 317: new trigonometric distance, metallicity and upper limit to the mass of GJ 317b
• Refined Metallicity Indices for M Dwarfs Using the SLoWPoKES Catalog of Wide, Low-mass Binaries
• Mapping the Local Halo: Statistical Parallax Analysis of SDSS Low-Mass Subdwarfs
• Revised age for CM Draconis and WD 1633+572: Toward a resolution of model-observation radius discrepancies
• Using High-Resolution Optical Spectra to Measure Intrinsic Properties of Low-Mass Stars: New Properties for KOI-314 and GJ 3470
• Isotopic Titanium Abundances in Local M Dwarfs

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• How to Constrain Your M dwarf II: the mass-luminosity-metallicity relation from 0.075 to 0.70$M_{\odot }$
• The inner edge of the habitable zone for synchronously rotating planets around low-mass stars using general circulation models
• CARMENES input catalogue of M dwarfs V. Luminosities, colours, and spectral energy distributions
• The 10 parsec sample in the Gaia era
• A Near-Infrared Spectroscopic Survey of 886 Nearby M Dwarfs
• Chemical Abundances of M-dwarfs from the APOGEE Survey. I. The Exoplanet Hosting Stars Kepler-138 and Kepler-186
• ACRONYM III: Radial Velocities for 336 Candidate Young Low-Mass Stars in the Solar Neighborhood, Including 78 Newly Confirmed Young Moving Group Members
• The CARMENES search for exoplanets around M dwarfs. Measuring precise radial velocities in the near infrared: the example of the super-Earth CD Cet b
• Proxima Centauri as a Benchmark for Stellar Activity Indicators in the Near Infrared
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• The CARMENES search for exoplanets around M dwarfs -- A deep learning approach to determine fundamental parameters of target stars
• Absolute densities in exoplanetary systems: photodynamical modelling of Kepler-138
• Examining the relationships between colour, $T_{\mathrm{eff}}$, and [M/H] for APOGEE K and M dwarfs
• On the dynamical history of the interstellar object 'Oumuamua?
• Elemental abundances of nearby M dwarfs based on high-resolution near-infrared spectra obtained by the Subaru/IRD survey: Proof of concept
• Apparent Non-Coevality among the Stars in Upper Scorpio: Resolving the Problem using a Model of Magnetic Inhibition of Convection
• Effective Temperatures of Low-Mass Stars from High-Resolution H-band Spectroscopy
• A Bright Short Period M-M Eclipsing Binary from the KELT Survey: Magnetic Activity and the Mass-Radius Relationship for M-dwarfs
• Fine structure of the age-chromospheric activity relation in solar-type stars I: The Ca II infrared triplet: Absolute flux calibration
• MUSE library of stellar spectra
• A likely magnetic activity cycle for the exoplanet host M dwarf GJ 3512
• Planetary companions orbiting the M dwarfs GJ 724 and GJ 3988. A CARMENES and IRD collaboration
• The CARMENES search for exoplanets around M dwarfs -- A deep transfer learning method to determine Teff and [M/H] of target stars
• Search for Close Stellar Encounters with the Solar System from Data on Nearby Dwarfs
• SAFARI I: A SPHERE discovery of a super metal-rich M dwarf companion to the star HD 86006
• Kepler data on KIC 7341653, a nearby M dwarf with monster flares and a phase-coherent variability
• Metallicities in M dwarfs: Investigating different determination techniques