A giant planet in orbit around a magnetic-braking hibernating cataclysmic variable

	A giant planet in orbit around a magnetic-braking hibernating cataclysmic variable
	Qian SB(钱声帮)1,2,3 ; Liao WP(廖文萍)1,2,3 ; Zhu LY(朱俐颖)1,2,3 ; Dai ZB(戴智斌)1,2,3 ; Liu L(刘亮)1,2,3 ; He JJ(何家佳)1,2,3 ; Zhao EG(赵二刚)1,2,3 ; Li LJ(李临甲)1,2,3
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2010
卷号	401 期号:1 页码:L34-L38
关键词	binaries: close binaries: eclipsing stars: individual: QS Vir planetary systems white dwarf
ISSN号	0035-8711
通讯作者	Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	Detections of Jupiter-like giant planets in orbit around short-period white dwarf binaries should provide insight into the formation and evolution of circumbinary planets (planets orbiting both components of short-period binaries), as well as into the ultimate fate of planets and the late evolutionary stage of binary stars (e.g. the evolution of the common envelope). However, to date no planets have been detected as companions to such close binaries. Here, we report the discovery of a giant planet orbiting the only known hibernating cataclysmic variable (CV), QS Vir, with a period of 7.86 yr. We analysed the variations of the orbital period of the eclipsing white dwarf-red dwarf binary, and a very small-amplitude cyclic change is found to be superimposed on a long-term period decrease. The period oscillation has the smallest amplitude among close binary stars and can be plausibly interpreted as the light-travel time effect via the presence of a third body. We found that the tertiary component is a giant planet with a mass of similar to 6.4 M(Jupiter) at a distance of similar to 4.2 astronomical units (au) from the binary. The continuous decrease is explained as angular momentum loss via magnetic braking which is driving the evolution of the hibernating CV into a normal cataclysmic binary.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	BROWN DWARF COMPANION ; WHITE-DWARFS ; BINARY-SYSTEMS ; STAR ; EVOLUTION ; CONFIRMATION ; SUBSTELLAR ; YOUNG
收录类别	SCI
原文出处	http://mnrasl.oxfordjournals.org/content/401/1/L34
语种	英语
WOS记录号	WOS:000272867100008
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5844]
专题	云南天文台_双星与变星研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, China 2.Graduate University of the Chinese Academy of Sciences, Yuquan Road 19, Sijingshang Block, 100049 Beijing, China 3.Laboratory for the Structure and Evolution of Celestial Bodies, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, China
推荐引用方式 GB/T 7714	Qian SB,Liao WP,Zhu LY,et al. A giant planet in orbit around a magnetic-braking hibernating cataclysmic variable[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,401(1):L34-L38.
APA	Qian SB.,Liao WP.,Zhu LY.,Dai ZB.,Liu L.,...&Li LJ.(2010).A giant planet in orbit around a magnetic-braking hibernating cataclysmic variable.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,401(1),L34-L38.
MLA	Qian SB,et al."A giant planet in orbit around a magnetic-braking hibernating cataclysmic variable".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 401.1(2010):L34-L38.