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LONG-TERM DECREASE AND CYCLIC VARIATION IN THE ORBITAL PERIOD OF THE ECLIPSING DWARF NOVA V2051 OPH
Qian SB(钱声帮)1,2,3; Han ZT(韩忠涛)1,2,3; Fernandez Lajus, E.4,5; Zhu LY(朱俐颖)1,2,3; Li LJ(李临甲)1,2; Liao WP(廖文萍)1,2; Zhao EG(赵二刚)1,2,3; Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2015-11
卷号221期号:1
DOI10.1088/0067-0049/221/1/17
产权排序第1完成单位
收录类别SCI
关键词Binaries: Eclipsing Planetary System Stars: Dwarf Nova Stars: Evolution Stars: Individuals (V2051 Oph)
摘要V2051 Oph is a deeply eclipsing dwarf nova with an orbital period below the period gap of cataclysmic variables (CVs). It has been photometrically monitored since 2008 June and 24 mid-eclipse times of the white dwarf have been obtained. The changes in the orbital period are investigated using all of the available mid-eclipse times. A continuous period decrease with a rate of P = -5.93 x 10(-10) days yr(-1) was discovered to be superimposed on a periodic variation with a small amplitude of 0 000329 and a period of 21.64 years. The standard theory predicted that the evolution of CVs below the period gap is driven by gravitational radiation. However, angular momentum loss (AML) via gravitational radiation is insufficient to explain this decrease, and additional AML via magnetic braking that is about five times the gravitational radiation rate is required. This is consistent with the theoretical requirement indicating that magnetic braking of the fully convective star is not completely stopped. The cyclic oscillation was interpreted as the variation of the arriving eclipse time via the presence of a third body because the required energy for the Applegate mechanism is much larger than that radiated from the secondary in 10 years. Its mass is derived as M-3 sin i' = 7.3(+/- 0.7) Jupiter mass. For orbital inclinations i' >= 30 degrees.3, it would be a planetary object. The giant circumbinary planet is orbiting around V2051 Oph at an orbital separation of about 9.0 astronomical units (AU) in an eccentric orbit (e' = 0.37). These conclusions support the ideas that some planets could survive stellar late evolution and that dwarf novae are also planetary hosting stars.
项目资助者Chinese Natural Science Foundation(11133007,11325315) ; Key Research Program of the Chinese Academy of Sciences(KGZD-EW-603) ; Science Foundation of Yunnan Province(2012HC011,2013FB084) ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09010202)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0067-0049
URL查看原文
归档日期2015-11-06 ; 2016-04-12
WOS记录号WOS:000366620600017
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]LOW-MASS STARS ; BINARY HS 0705+6700 ; CATACLYSMIC VARIABLES ; WHITE-DWARFS ; BROWN DWARFS ; ACCRETION-DISK ; CIRCUMBINARY PLANETS ; SUBSTELLAR OBJECTS ; STELLAR EVOLUTION ; MAGNETIC BRAKING
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9390
专题双星与变星研究组
中国科学院天体结构与演化重点实验室
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650011 Kunming, P. R. China
2.Key laboratory of the structure and evolution of celestial objects, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P. R. China
3.University of the Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, P. R. China
4.Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900, La Plata, Pcia. Bs. As., Argentina
5.Instituto de Astrofísica de La Plata (CCT La plata—CONICET/UNLP), Argentina
6.Visiting Astronomer, Complejo Astronómico El Leoncito operated under agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina and the National Universities of La Plata, Córdoba and San Juan.
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Qian SB,Han ZT,Fernandez Lajus, E.,et al. LONG-TERM DECREASE AND CYCLIC VARIATION IN THE ORBITAL PERIOD OF THE ECLIPSING DWARF NOVA V2051 OPH[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2015,221(1).
APA Qian SB.,Han ZT.,Fernandez Lajus, E..,Zhu LY.,Li LJ.,...&Qian, SB .(2015).LONG-TERM DECREASE AND CYCLIC VARIATION IN THE ORBITAL PERIOD OF THE ECLIPSING DWARF NOVA V2051 OPH.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,221(1).
MLA Qian SB,et al."LONG-TERM DECREASE AND CYCLIC VARIATION IN THE ORBITAL PERIOD OF THE ECLIPSING DWARF NOVA V2051 OPH".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 221.1(2015).
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