A Unique Low-Mass Ratio Contact Eclipsing Binary System under the Period Cut-Off

Abstract

We present a multi-band photometric analysis of CRTS J163819.6+03485, the first low mass ratio (LMR) contact binary system with a period under the contact binary (CB) period limit. The unprecedented combination of mass ratio and period makes this system unique for eclipsing binary (EB) research. Using new multi-band photometric observations, we explored the parameter space of this unique total EB system through a detailed scan in the mass ratio - inclination plane and using the PIKAIA genetic algorithm optimizer. The best set of relative physical parameters and corresponding uncertainties was adopted through Markov Chain Monte Carlo sampling of the parameter space. The resulting mass ratio of the system is $q=0.16\pm 0.01$. The absolute parameters were derived by adopting an empirical mass-luminosity relation. Period changes are also investigated by using new observations and archival photometric light curves from massive astronomical surveys, which revealed in a preliminary solution the presence of a possible low-mass tertiary companion. The origin and evolutionary status of the system are investigated through the detached-binary formation scenario.

References in corpus (29)

• emcee: The MCMC Hammer
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Evolution of binary stars and the effect of tides on binary populations
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• Shrinking binary and planetary orbits by Kozai cycles with tidal friction
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• Astrometry.net: Blind astrometric calibration of arbitrary astronomical images
• The Revised TESS Input Catalog and Candidate Target List
• A Computational Guide to Physics of Eclipsing Binaries. Paper I. Demonstrations and Perspectives
• V1309 Scorpii: merger of a contact binary
• The Catalina Surveys Periodic Variable Star Catalog
• The ASAS-SN Catalog of Variable Stars I: The Serendipitous Survey
• A First Catalog of Variable Stars Measured by the Asteroid Terrestrial-impact Last Alert System (ATLAS)
• Physics Of Eclipsing Binaries. II. Towards the Increased Model Fidelity
• On Galactic density modeling in the presence of dust extinction
• THE MINIMUM MASS RATIO OF W URSAE MAJORIS BINARIES
• Eclipsing time variations in close binary systems: Planetary hypothesis vs. Applegate mechanism
• The first light curve modeling and orbital period change investigation of nine contact binaries around the short period cut-off
• ZZ Piscis Austrinus (ZZ PsA): A bright red nova progenitor and the instability mass ratio of contact binary stars
• Contact binaries at the short period cut-off I. statistics and the first photometric investigations of ten totally eclipsing systems
• Apsidal motion and light a curve solution for eighteen SMC eccentric eclipsing binaries
• New low mass ratio contact binaries in the Catalina Sky Survey
• Eclipse timing variation analysis of OGLE-IV eclipsing binaries toward the Galactic Bulge. I. Hierarchical triple system candidates
• The detached-binary channel for the formation of contact binaries
• A study of light travel time effect in short-period MOA eclipsing binaries via eclipse timing
• Case AD, AR, and AS binary evolution and their possible connections with W UMa binaries
• Model computations of blue stragglers and W UMa-type stars in globular clusters
• Three Ultra-short Period Contact Eclipsing Binary Systems Mined from Massive Astronomical Surveys
• Time sequence spectroscopy of Epsilon CrA. The 518 nm Mg I triplet region analyzed with Broadening Functions