Close-In Substellar Companions and the Formation of sdB-Type Close Binary Stars

Authors

  • L. Y. Zhu Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P.R. China Key Laboratory for the Structure and Evolution of Celestial Bodies, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P. R. China. Physical Sciences Department, Graduate University of the Chinese Academy of Sciences, Yuquan Road 19, Sijingshang Block, 100049 Beijing, China
  • S. B. Qian Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P.R. China Key Laboratory for the Structure and Evolution of Celestial Bodies, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P. R. China. Physical Sciences Department, Graduate University of the Chinese Academy of Sciences, Yuquan Road 19, Sijingshang Block, 100049 Beijing, China
  • E.-G. Zhao Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P.R. China Key Laboratory for the Structure and Evolution of Celestial Bodies, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P. R. China
  • E. Fernández Lajús Facultad de Ciencias Astronomicasy Geofısicas, Universidad Nacional de La Plata, 1900 La Plata, Buenos Aires, Argentina. Instituto de Astrofisica de La Plata (CCT La plata - CONICET/UNLP), Argentina
  • Z.-T. Han Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P.R. China Key Laboratory for the Structure and Evolution of Celestial Bodies, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P. R. China. Physical Sciences Department, Graduate University of the Chinese Academy of Sciences, Yuquan Road 19, Sijingshang Block, 100049 Beijing, China

DOI:

https://doi.org/10.14311/APP.2015.02.0183

Abstract

The sdB-type close binaries are believed to have experienced a common-envelope phase and may evolve into cataclysmic binaries (CVs). About 10% of all known sdB binaries are eclipsing binaries consisting of very hot subdwarf primaries and low-mass companions with short orbital periods. The eclipse profiles of these systems are very narrow and deep, which benefits the determination of high precise eclipsing times and makes the detection of small and close-in tertiary bodies possible. Since 2006 we have monitored some sdB-type eclipsing binaries to search for the close-in substellar companions by analyzing the light travel time effect. Here some progresses of the program are reviewed and the formation of sdB-type binary is discussed.

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Published

2015-02-23

Issue

Vol. 2 No. 1 (2015): THE GOLDEN AGE OF CATACLYSMIC VARIABLES AND RELATED OBJECTS - II

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