A circumbinary planet in orbit around the short-period white dwarf eclipsing binary RR Cae

	A circumbinary planet in orbit around the short-period white dwarf eclipsing binary RR Cae
	Qian SB(钱声帮)1,2,3 ; Liu L(刘亮)1,2,3 ; Zhu LY(朱俐颖)1,2 ; Dai ZB(戴智斌)1,2 ; Lajus, EF 4,5; Baume, GL 4,5
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2012-05
卷号	422 期号:1 页码:L24-L27
关键词	binaries: close binaries: eclipsing stars: individual: RR Cae planetary systems white dwarfs
ISSN号	0035-8711
通讯作者	Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	By using six newly determined mid-eclipse times together with those collected from the literature, we have found that the observed minus calculated (O-C) curve of RR Cae shows a cyclic change with a period of 11.9 yr and an amplitude of 14.3 s while it undergoes an upward parabolic variation [revealing a long-term period increase at a rate of. P = +4.18(+/- 0.20) x 10(-12)]. The cyclic change was analysed for the light-travel-time effect that arises from the gravitational influence of a third companion. The mass of the third body was determined to be M(3)sin i' = 4.2(+/- 0.4) M-Jup, suggesting that it is a circumbinary giant planet when its orbital inclination is larger than 17.degrees 6. The orbital separation of the circumbinary planet from the central eclipsing binary is about 5.3(+/- 0.6) au. The period increase is opposite to the changes caused by angular momentum loss via magnetic braking or/and gravitational radiation; and it cannot be explained by the mass transfer between both components because of its detached configuration. These indicate that the observed upward parabolic change is only a part of a long-period (longer than 26.3 yr) cyclic variation, which may reveal the presence of another giant circumbinary planet in a wide orbit.
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]	NN-SER ; COMPANION ; SPECTROSCOPY ; STAR ; VIR
收录类别	SCI
原文出处	http://mnrasl.oxfordjournals.org/content/422/1/L24
语种	英语
WOS记录号	WOS:000303912600006
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5868]
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.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, China 3.Graduate University of the Chinese Academy of Sciences, 19A Yuquanlu, Sijingshang Block, 100049 Beijing, China 4.Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, 1900 La Plata, Buenos Aires, Argentina 5.Instituto de Astrofisica de La Plata (CCT La Plata — CONICET/UNLP), Paseo del Bosque s/n, La Plata, BA, B1900FWA, Argentina
推荐引用方式 GB/T 7714	Qian SB,Liu L,Zhu LY,et al. A circumbinary planet in orbit around the short-period white dwarf eclipsing binary RR Cae[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,422(1):L24-L27.
APA	Qian SB,Liu L,Zhu LY,Dai ZB,Lajus, EF,&Baume, GL.(2012).A circumbinary planet in orbit around the short-period white dwarf eclipsing binary RR Cae.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,422(1),L24-L27.
MLA	Qian SB,et al."A circumbinary planet in orbit around the short-period white dwarf eclipsing binary RR Cae".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 422.1(2012):L24-L27.