BINARIES MIGRATING IN A GASEOUS DISK: WHERE ARE THE GALACTIC CENTER BINARIES?

	BINARIES MIGRATING IN A GASEOUS DISK: WHERE ARE THE GALACTIC CENTER BINARIES?
	Baruteau, C.1; Cuadra, J.2,3,4; Lin, D. N. C.1,5
刊名	ASTROPHYSICAL JOURNAL
	2011
卷号	726 期号:1 页码:1
关键词	accretion binaries: general Galaxy: center hydrodynamics methods: numerical accretion disks
英文摘要	The massive stars in the Galactic center inner arcsecond share analogous properties with the so-called Hot Jupiters. Most of these young stars have highly eccentric orbits and were probably not formed in situ. It has been proposed that these stars acquired their current orbits from the tidal disruption of compact massive binaries scattered toward the proximity of the central supermassive black hole. Assuming a binary star formed in a thin gaseous disk beyond 0.1 pc from the central object, we investigate the relevance of disk-satellite interactions to harden the binding energy of the binary, and to drive its inward migration. A massive, equal-mass binary star is found to become more tightly wound as it migrates inward toward the central black hole. The migration timescale is very similar to that of a single-star satellite of the same mass. The binary's hardening is caused by the formation of spiral tails lagging the stars inside the binary's Hill radius. We show that the hardening timescale is mostly determined by the mass of gas inside the binary's Hill radius and that it is much shorter than the migration timescale. We discuss some implications of the binary's hardening process. When the more massive (primary) components of close binaries eject most their mass through supernova explosion, their secondary stars may attain a range of eccentricities and inclinations. Such processes may provide an alternative unified scenario for the origin of the kinematic properties of the central cluster and S-stars in the Galactic center as well as the high-velocity stars in the Galactic halo.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SUPERMASSIVE BLACK-HOLES ; GRAVITATING ACCRETION DISK ; I PLANETARY MIGRATION ; INITIAL MASS FUNCTION ; SGR-A-ASTERISK ; HYPERVELOCITY STARS ; YOUNG STARS ; HORSESHOE DRAG ; STELLAR ORBITS ; S-STARS
收录类别	SCI
语种	英语
WOS记录号	WOS:000285411300028
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/26380]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA 2.Shanghai Astron Observ, Shanghai 200030, Peoples R China 3.Max Planck Inst Astrophys, D-85741 Garching, Germany 4.Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Santiago, Chile 5.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Baruteau, C.,Cuadra, J.,Lin, D. N. C.. BINARIES MIGRATING IN A GASEOUS DISK: WHERE ARE THE GALACTIC CENTER BINARIES?[J]. ASTROPHYSICAL JOURNAL,2011,726(1):1.
APA	Baruteau, C.,Cuadra, J.,&Lin, D. N. C..(2011).BINARIES MIGRATING IN A GASEOUS DISK: WHERE ARE THE GALACTIC CENTER BINARIES?.ASTROPHYSICAL JOURNAL,726(1),1.
MLA	Baruteau, C.,et al."BINARIES MIGRATING IN A GASEOUS DISK: WHERE ARE THE GALACTIC CENTER BINARIES?".ASTROPHYSICAL JOURNAL 726.1(2011):1.