Photometric light curve solutions of three ultra-short period eclipsing binaries

Abstract

We present the results of our study of the eclipsing binary systems CSS J112237.1+395219, LINEAR 1286561 and LINEAR 2602707 based on new CCD $B$, $V$, $R_c$ and $I_c$ complete light curves. The ultra-short period nature of the stars \citep{Drake2014} is confirmed and the system's periods are revised. The light curves were modelled using the 2005 version of the Wilson-Devinney code. When necessary, cool spots on the surface of the primary component were introduced to account for asymmetries in the light curves. As a result, we found that CSS J112237.1+395219 is a W UMa type contact binary system belonging to W subclass with a mass ratio of $q=1.61$ and a shallow degree of contact of 14.8\% where the primary component is hotter than the secondary one by $500K$. LINEAR 1286561 and LINEAR 2602707 are detached binary systems with mass ratios $q=3.467$ and $q=0.987$ respectively. These detached systems are low-mass M-type eclipsing binaries of similar temperatures. The marginal contact, the fill-out factor and the temperature difference between components of CSS J112237.1+395219 suggest that this system may be at a key evolutionary state predicted by the Thermal Relaxation Oscillation theory (TRO). From the estimated absolute parameters we conclude that our systems share common properties with others ultra-short period binaries.

11 pages, 7 figures, accepted for publications in Research in Astronomy & Astrophysics

References in corpus (19)

• The Dartmouth Stellar Evolution Database
• The Tenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Apache Point Observatory Galactic Evolution Experiment
• Kepler Eclipsing Binary Stars. I. Catalog and Principal Characterization of 1879 Eclipsing Binaries in the First Data Release
• Short period eclipsing binary candidates identified using SuperWASP
• Period and period change measurements for 143 SuperWASP eclipsing binary candidates near the short-period limit and discovery of a doubly eclipsing quadruple system
• The short-period limit of contact binaries
• The shortest-period M-dwarf eclipsing system BW3 V38
• The evolutionary status of W Ursae Majoris-type systems
• Spectroscopic binaries with components of similar mass
• Ultra-short Period Binaries from the Catalina Surveys
• The shortest period M-dwarf eclipsing system BW3 V38, II: determination of absolute elements
• GSC 2314-0530: the shortest-period eclipsing system with dMe components
• Periodic Variability of Low-Mass Stars in SDSS Stripe 82
• Ultrashort-period MS eclipsing systems. New observations and light curve solutions of six NSVS binaries
• The Very Short Period M Dwarf Binary SDSS J001641-000925
• Twins Among the Low Mass Spectroscopic Binaries
• Observations and light curve solutions of ultrashort-period eclipsing binaries
• Photometric Investigation of the K-type Extreme-Shallow Contact Binary V1799 Orion
• The First Eclipsing Binary Catalogue from the MOA-II database