An empirical calibration to estimate cool dwarf fundamental parameters from H-band spectra

Abstract

Interferometric radius measurements provide a direct probe of the fundamental parameters of M dwarfs, but is within reach for only a limited sample of nearby, bright stars. We use interferometrically-measured radii, bolometric luminosities, and effective temperatures to develop new empirical calibrations based on low-resolution, near-infrared spectra. We use H-band Mg and Al features to derive calibrations for effective temperature, radius and log luminosity; the standard deviations in the residuals of our best fits are, respectively, 73K, 0.027Rsun, and 0.049 dex (11% error on luminosity). These relationships are valid for mid K to mid M dwarf stars, roughly corresponding to temperatures between 3100 and 4800K. We apply our calibrations to M dwarfs targeted by the MEarth transiting planet survey and to the cool Kepler Objects of Interest (KOIs). We independently validate our calibrations by demonstrating a clear relationship between our inferred parameters and the absolute K magnitudes of the MEarth stars, and we identify objects with magnitudes too bright for their estimated luminosities as candidate multiple systems. We also use our inferred luminosities to address the applicability of near-infrared metallicity calibrations to mid and late M dwarfs. The temperatures we infer for the KOIs agree remarkably well with those from the literature; however, our stellar radii are systematically larger than those presented in previous works that derive radii from model isochrones. This results in a mean planet radius that is 15% larger than one would infer using the stellar properties from recent catalogs. Our results confirm those of previous in-depth studies of Kepler-42, Kepler-45, and Kepler-186.

arXiv commentAccepted to ApJ. Tables 4 and 5, and machine readable versions of Tables 5 and 7 are available in the ApJ journal article

References in corpus (56)

• The chemical composition of the Sun
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• The Dartmouth Stellar Evolution Database
• A Method of Correcting Near-Infrared Spectra for Telluric Absorption
• Kepler Input Catalog: Photometric Calibration and Stellar Classification
• The Infrared Telescope Facility (IRTF) Spectral Library: Cool Stars
• An Infrared Spectroscopic Sequence of M, L and T Dwarfs
• The Occurrence Rate of Small Planets around Small Stars
• Stellar Diameters and Temperatures II. Main Sequence K & M Stars
• Absolute dimensions of the M-type eclipsing binary YY Geminorum (Castor C): a challenge to evolutionary models in the lower main-sequence
• Revised Stellar Properties of Kepler Targets for the Quarter 1-16 Transit Detection Run
• Evolution of low-mass star and brown dwarf eclipsing binaries
• 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
• On the Correlation between the Magnetic Activity Levels, the Metallicities and the Radii of Low-Mass Stars
• An Earth-sized Planet in the Habitable Zone of a Cool Star
• A survey of the high order multiplicity of nearby solar-type binary stars with Robo-AO
• The Effective Temperature Scale of M dwarfs
• Characterizing the Cool KOIs III. KOI-961: A Small Star with Large Proper Motion and Three Small Planets
• 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?
• Spectral Energy Distributions for Disk and Halo M--Dwarfs
• M dwarfs: effective temperatures, radii and metallicities
• Prospecting in late-type dwarfs: a calibration of infrared and visible spectroscopic metallicities of late-K and M dwarfs spanning 1.5 dex
• First radius measurements of very low mass stars with the VLTI
• TiO and H${}_2$O absorption lines in cool stellar atmospheres
• Mass-radius relation of low and very low-mass stars revisited with the VLTI
• Characterizing the Cool KOIs II. The M Dwarf KOI-254 and its Hot Jupiter
• Metal-Rich M-dwarf Planet Hosts: Metallicities with K-Band Spectra
• GU Boo: A New 0.6 Msun Detached Eclipsing Binary
• Transit Detection in the MEarth Survey of Nearby M Dwarfs: Bridging the Clean-First, Search-Later Divide
• Masses and Radii of Low-Mass Stars: Theory versus Observations
• Characterizing the Cool Kepler Objects of Interest. New Effective Temperatures, Metallicities, Masses and Radii of Low-Mass Kepler Planet-Candidate Host Stars
• First Results from the CHARA Array. IV. The Interferometric Radii of Low-Mass Stars
• They might be giants: luminosity class, planet frequency, and planet-metallicity relation of the coolest Kepler target stars
• Stellar Diameters and Temperatures V. Eleven Newly Characterized Exoplanet Host Stars
• Towards stellar effective temperatures and diameters at one per cent accuracy for future surveys
• The GJ 436 System: Directly Determined Astrophysical Parameters of an M-Dwarf and Implications for the Transiting Hot Neptune
• New neighbours. III. 21 new companions to nearby dwarfs, discovered with adaptive optics
• An H-band Spectroscopic Metallicity Calibration for M Dwarfs
• Metallicities of M Dwarf Planet Hosts from Spectral Synthesis
• Prospecting in Ultracool Dwarfs: Measuring the Metallicities of Mid- and Late-M Dwarfs
• M-dwarf metallicities - A high-resolution spectroscopic study in the near infrared
• Trigonometric Parallaxes for 1,507 Nearby Mid-to-Late M-dwarfs
• The Age, Stellar Content and Star Formation Timescale of the B59 Dense Core
• Candidate Planets in the Habitable Zones of Kepler Stars
• 2MASS J05162881+2607387: A New Low-Mass Double-Lined Eclipsing Binary
• Thirty New Low-Mass Spectroscopic Binaries
• Discovery of 9 New Companions to Nearby Young M Stars with the Altair AO System
• Accurate Low-Mass Stellar Models of KOI-126
• Characterizing the Cool KOIs. VI. H- and K-band Spectra of Kepler M Dwarf Planet-Candidate Hosts
• Five new very low mass binaries
• The LuckyCam Survey for Very Low Mass Binaries II: 13 new M4.5-M6.0 Binaries
• Angular Diameters of the G Subdwarf $\mu$ Cassiopeiae A and the K Dwarfs $\sigma$ Draconis and HR 511 from Interferometric Measurements with the CHARA Array
• Astrometric Discovery of GJ 802b: In the Brown Dwarf Oasis?
• Exoplanet Characterization by Proxy: a Transiting 2.15 R_Earth Planet Near the Habitable Zone of the Late K dwarf Kepler-61

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• How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
• How to Constrain Your M dwarf II: the mass-luminosity-metallicity relation from 0.075 to 0.70$M_{\odot }$
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• The inner edge of the habitable zone for synchronously rotating planets around low-mass stars using general circulation models
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• They are Small Worlds After All: Revised Properties of Kepler M Dwarf Stars and their Planets
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• The L 98-59 System: Three Transiting, Terrestrial-Sized Planets Orbiting a Nearby M-dwarf
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• Eleven Multi-planet Systems from K2 Campaigns 1 & 2 and the Masses of Two Hot Super-Earths
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• Setting the stage for the search for life with the Habitable Worlds Observatory: Properties of 164 promising planet survey targets
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• Data-Driven Spectroscopy of Cool Stars at High Spectral Resolution
• Lyman-$\alpha$ Observations of High Radial Velocity Low-Mass Stars Ross 1044 and Ross 825
• Primeval very low-mass stars and brown dwarfs -- VII. The discovery of the first wide M + L extreme subdwarf binary
• Understanding Physical Properties of Young M-dwarfs: NIR spectroscopic studies
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• Magnetic Inflation and Stellar Mass. V. Intensification and saturation of M dwarf absorption lines with Rossby number
• The CARMENES search for exoplanets around M dwarfs -- A deep transfer learning method to determine Teff and [M/H] of target stars
• Wide companions to M and L subdwarfs with Gaia and the Virtual Observatory
• Characterisation of close visual binaries from the AstraLux Large M Dwarf Survey
• Characterization of Low Mass K2 Planet Hosts Using Near-Infrared Spectroscopy
• A Double-lined M-dwarf Eclipsing Binary from CSSxSDSS
• ChromaStarDB: SQL database-driven spectrum synthesis, and more
• M dwarf spectral indices at moderate resolution: accurate $T_{\mathrm{eff}}$ and [Fe/H] for 178 southern stars
• SDSSJ1156-0207: A 0.54 M_sun + 0.19 M_sun Double-lined M Dwarf Eclipsing Binary System
• tonalli: an asexual genetic code to characterise APOGEE-2 stellar spectra. I. Validation with synthetic and solar spectra
• Ross 19B: An Extremely Cold Companion Discovered via the Backyard Worlds: Planet 9 Citizen Science Project
• The M-dwarf Ultraviolet Spectroscopic Sample I. Determining Stellar Parameters for Field Stars
• Metallicities in M dwarfs: Investigating different determination techniques