Substellar objects around the sdB eclipsing binaries

Liying Zhu, Shengbang Qian, Linjia Li & Wenping Liao

Yunnan Observatories, Chinese Academy of Sciences, P.R. China

The sdB-type close binaries are believed to have experienced a common-envelope phase and may evolve into cataclysmic binaries (CVs). About one in ten sdB binary is eclipsing binary, which is composed of a very hot subdwarf primary and a low-mass companion with short orbital period. The narrow and deep eclipse profiles of sdB eclipsing binaries make high precise eclipsing timings available, which are very useful to detect the small objects around them. In 2006, we began to monitor some sdB-type eclipsing binaries to search for the substellar companions by analyzing the light travel time effect. In the present paper, some new progresses of the program are reviewed and the interaction of these substellar objects and the sdB-type close binaries is discussed.

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