First Results from the CHARA Array. IV. The Interferometric Radii of Low-Mass Stars

Abstract

We have measured the angular diameters of six M dwarfs with the CHARA Array, a long-baseline optical interferometer located at Mount Wilson Observatory. Spectral types range from M1.0 V to M3.0 V and linear radii from 0.38 to 0.69 Rsun. These results are consistent with the seven other M-dwarf radii measurements from optical interferometry and with those for sixteen stars in eclipsing binary systems. We compare all directly measured M dwarf radii to model predictions and find that current models underestimate the true stellar radii by up to 15-20%. The differences are small among the metal-poor stars but become significantly larger with increasing metallicity. This suggests that theoretical models for low mass stars may be missing some opacity source that alters the computed stellar radii.

24 pages, 5 figures, accepted for publication in the ApJ

Cited by in corpus (57)

• How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
• Evolution of low-mass star and brown dwarf eclipsing binaries
• Homogeneous studies of transiting extrasolar planets. I. Light curve analyses
• The NASA-UC-UH Eta-Earth Program: IV. A Low-mass Planet Orbiting an M Dwarf 3.6 PC from Earth
• Confirmation of the Electron Cyclotron Maser Instability as the Dominant Source of Radio Emission from Very Low Mass Stars and Brown Dwarfs
• A Guide to Realistic Uncertainties on Fundamental Properties of Solar-Type Exoplanet Host Stars
• The CARMENES search for exoplanets around M dwarfs: Different roads to radii and masses of the target stars
• M dwarfs: effective temperatures, radii and metallicities
• Post Common Envelope Binaries from SDSS. I: 101 white dwarf main sequence binaries with multiple SDSS spectroscopy
• The effect of activity on stellar temperatures and radii
• Asteroseismology and Interferometry
• Homogeneous studies of transiting extrasolar planets. II. Physical properties
• ARIADNE: Measuring accurate and precise stellar parameters through SED fitting
• CHARA Array Measurements of the Angular Diameters of Exoplanet Host Stars
• An empirical calibration to estimate cool dwarf fundamental parameters from H-band spectra
• Accurate M Dwarf Metallicities from Spectral Synthesis: A Critical Test of Model Atmospheres
• Self-Consistent Magnetic Stellar Evolution Models of the Detached, Solar-Type Eclipsing Binary EF Aquarii
• Revised Filter Profiles and Zero Points for Broadband Photometry
• Post Common Envelope Binaries from SDSS. V: Four eclipsing white dwarf main sequence binaries
• Nearby young stars selected by proper motion. I. Four new members of the Beta Pictoris moving group from the Tycho-2 catalog
• Eleven Exoplanet Host Star Angular Diameters from the CHARA Array
• A discontinuity in the $T_{\mathrm{eff}}$-radius relation of M-dwarfs
• The EBLM Project V. Physical properties of ten fully convective, very-low-mass stars
• 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
• Barnes-Evans relations for dwarfs with an application to the determination of distances to cataclysmic variables
• The EBLM project. II. A very hot, low-mass M dwarf in an eccentric and long period eclipsing binary system from SuperWASP
• The pre-cataclysmic variable, LTT560
• Orbital Parameters and Chemical Composition of Four White Dwarfs in Post-Common Envelope Binaries
• The EBLM project -- VIII. First results for M-dwarf mass, radius and effective temperature measurements using CHEOPS light curves
• T-Lyr1-17236: A Long-Period Low-Mass Eclipsing Binary
• The Gold Standard: Accurate Stellar and Planetary Parameters for Eight Kepler M dwarf Systems Enabled by Parallaxes
• BD-22 5866: A Low-mass Quadruple-lined Spectroscopic AND Eclipsing Binary
• Effective Temperatures of Low-Mass Stars from High-Resolution H-band Spectroscopy
• Towards reliable uncertainties in IR interferometry: The bootstrap for correlated statistical & systematic errors
• The EBLM project -- IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves
• Estimating $T_{\mathrm{eff}}$, radius and luminosity of M-dwarfs using high resolution optical and NIR spectral features
• The Solar Neighborhood XLII. Parallax Results from the CTIOPI 0.9-m Program --- Identifying New Nearby Subdwarfs Using Tangential Velocities and Locations on the H-R Diagram
• Photometric Calibrations of M-dwarf Metallicity with Markov Chain Monte Carlo and Bayesian Inference
• The Feasibility of Directly Imaging Nearby Cold Jovian Planets with MIRI/JWST
• Fundamental effective temperature measurements for eclipsing binary stars -- III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31
• Astrophysics in 2006
• TIC-320687387 B: a long-period eclipsing M-dwarf close to the hydrogen burning limit
• Revising the properties of low mass eclipsing binary stars using TESS light curves
• The SDSS-HET Survey of Kepler Eclipsing Binaries. Description of the Survey and First Results
• Characterization of M dwarfs Using Optical Mid-Resolution Spectra for Exploration of Small Exoplanets
• Determination of mass and orbital parameters of a low-mass star HD 213597B
• Eclipsing binaries in the open cluster Ruprecht 147. IV: The active triple system EPIC 219511354
• Recovering variable stars in large surveys: EA${}_{\mathrm{up}}$ Algol-type class in the Catalina Survey
• Characterisation of magnetic activity of M dwarfs. Possible impact on the surface brightness
• Orbital and stellar parameters for 2M06464003+0109157: a double-lined eclipsing binary of spotted, sub-solar twins
• HST/FGS Trigonometric Parallaxes of M-dwarf Eclipsing Binaries
• Abundance analysis of benchmark M dwarfs
• MANGOS II: Five new giant planets orbiting low-mass stars
• Bias-free model fitting of correlated data in interferometry
• The first low-mass eclipsing binary within the fully convective zone from TMTS
• NGTS-EB-8: A double-lined eclipsing M+M binary discovered by citizen scientists
• Metallicities in M dwarfs: Investigating different determination techniques