The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 37 Issue 2
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- Pages.142.1-142.1
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- 2012
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- 1226-2692(pISSN)
Observational Properties of GSC 2855-0585 in the Vicinity of the Eclipsing Binary V432 Per
- Koo, Jae-Rim (Korea Astronomy and Space Science Institute) ;
- Lee, Jae Woo (Korea Astronomy and Space Science Institute) ;
- Kim, Seung-Lee (Korea Astronomy and Space Science Institute) ;
- Lee, Chung-Uk (Korea Astronomy and Space Science Institute) ;
- Lee, Byeong-Cheol (Korea Astronomy and Space Science Institute)
- Published : 2012.10.17
Abstract
During the photometric runs of the eclipsing binary V432 Per in 2006, we serendipitously discovered peculiar light variations of GSC 2855-0585 that imaged on the same target field. Its brightness decreased about 0.02 mag for about 0.15 days in all B, V, and R bands. The depth, duration, and box-shaped light curves are very similar to those of typical transiting exoplanets. We gathered the time-series data of GSC 2855-0585 from the SuperWASP public archive and detected the same light variations with a period of about 2.406 days. The period and transitlike features were confirmed by photometric follow-up observations at a predicted epoch in 2010 November. In order to estimate the mass of the companion that produced the light variations, we obtained 10 high-resolution spectra with different orbital phases in 2010 November and 2011 October-December. The radial velocities showed large variations of about 44 km/s. It indicates that the transitlike light variations do not originate from a transiting exoplanet, but from the single-lined spectroscopic eclipsing binary with a cool dwarf companion. Using the photometric and spectroscopic data, we estimated the physical parameters of the eclipsing binary GSC 2855-0585, such as orbital period, effective temperature, surface gravity, and mass.
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