Period decrease in three SuperWASP eclipsing binary candidates near the short-period limit

Abstract

SuperWASP light curves for 53 W UMa-type eclipsing binary (EB) candidates, identified in previous work as being close to the contact binary short-period limit, were studied for evidence of period change. The orbital periods of most of the stars were confirmed, and period decrease, significant at more than 5 sigma, was observed in three objects: 1SWASP J174310.98+432709.6 (-0.055 \pm0.003 s/yr), 1SWASP J133105.91+121538.0 (-0.075 \pm0.013 s/yr) and 1SWASP J234401.81-212229.1 (-0.313 \pm0.019 s/yr). The magnitudes of the observed period changes cannot be explained by magnetic braking or gravitational radiation effects, and are most likely primarily due to unstable mass transfer from primary to secondary components, possibly accompanied by unstable mass and angular momentum loss from the systems. If these period decreases persist, the systems could merge on a relatively short timescale.

6 pages, 7 figures. Accepted for publication in A&A (3 May 2012)

References in corpus (10)

• Evolution of binary stars and the effect of tides on binary populations
• The WASP Project and the SuperWASP Cameras
• A Computational Guide to Physics of Eclipsing Binaries. Paper I. Demonstrations and Perspectives
• V1309 Scorpii: merger of a contact binary
• THE MINIMUM MASS RATIO OF W URSAE MAJORIS BINARIES
• The short period end of the contact binary period distribution based on the All Sky Automated Survey (ASAS)
• Short period eclipsing binary candidates identified using SuperWASP
• The short-period limit of contact binaries
• SuperWASP observations of pulsating Am stars
• How Many CVs are Crossing the Period Gap? A Test for the Disruption of Magnetic Braking

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