A Double-lined M-dwarf Eclipsing Binary from CSSxSDSS
arXiv:1701.05293 · doi:10.3847/1538-3881/153/3/118
Abstract
Eclipsing binaries offer a unique opportunity to determine basic stellar properties. With the advent of wide-field camera and all-sky time-domain surveys, thousands of eclipsing binaries have been charted via light curve classification, yet their fundamental properties remain unexplored, mainly due to the extensive efforts needed for spectroscopic follow-ups. In this paper we present the discovery of a short period (P=0.313 days) double-lined M-dwarf eclipsing binary, CSSJ114804.3+255132/SDSSJ114804.35+255132.6, by cross-matching binary light curves from Catalina Sky Surveys and spectroscopically classified M dwarfs from Sloan Digital Sky Survey. We obtain follow-up spectra using Gemini telescope, enabling us to determine the mass, radius, and temperature of the primary and secondary component to be M1 = 0.47\pm0.03(statistic)\pm0.03(systematic) M_sun, M2 = 0.46\pm0.03(statistic)\pm0.03(systematic) M_sun, R1 = 0.52\pm0.08(statistic)\pm0.07(systematic) R_sun, R2 = 0.60\pm0.08(statistic)\pm0.08(systematic) R_sun, T1 = 3560\pm100 K, and T2 = 3040\pm100 K, respectively. The systematic error was estimated using the difference between eccentric and non-eccentric fit. Our analysis also indicates that there is definitively 3rd-light contamination (66%) in the CSS photometry. The secondary star seems inflated, probably due to tidal locking of the close secondary companion, which is common for very short period binary systems. Future spectroscopic observations with high resolution will narrow down the uncertainties of stellar parameters for both component, rendering this system as a benchmark in studying fundamental properties of M dwarfs.
arXiv commentAJ accepted
References in corpus (21)
- The Sloan Digital Sky Survey: Technical Summary
- Accurate masses and radii of normal stars: modern results and applications
- First Results from the Catalina Real-time Transient Survey
- On the Unique Solution of Planet and Star Parameters from an Extrasolar Planet Transit Light Curve
- How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
- The Occurrence Rate of Small Planets around Small Stars
- Stellar Diameters and Temperatures II. Main Sequence K & M Stars
- The Catalina Surveys Periodic Variable Star Catalog
- Stellar SEDs from 0.3-2.5 Microns: Tracing the Stellar Locus and Searching for Color Outliers in SDSS and 2MASS
- Eclipsing binaries in open clusters. II. V453 Cyg in NGC 6871
- The Sloan Digital Sky Survey Data Release 7 Spectroscopic M Dwarf Catalog I: Data
- An All-Sky Catalog of Bright M Dwarfs
- Probing the Outer Galactic halo with RR Lyrae from the Catalina Surveys
- The Solar Neighborhood XXXVII: The Mass-Luminosity Relation for Main Sequence M Dwarfs
- The Mass-Radius(-Rotation?) Relation for Low-Mass Stars
- Mass-radius relation of low and very low-mass stars revisited with the VLTI
- Magnetic Inhibition of Convection and the Fundamental Properties of Low-Mass Stars. I. Stars with a Radiative Core
- Magnetic Inhibition of Convection and the Fundamental Properties of Low-Mass Stars. II. Fully Convective Main Sequence Stars
- An empirical calibration to estimate cool dwarf fundamental parameters from H-band spectra
- Solutions for 10,000 Eclipsing Binaries in the Bulge Fields of OGLE II Using DEBiL
- Nearby M, L, and T Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)