Low-mass companions to T Tauri stars: A mechanism for rapid-rise FU Orionis outbursts

被引：43
|
作者：
Clarke, CJ
Syer, D
机构：
[1] UNIV LONDON QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND
[2] CANADIAN INST THEORET ASTROPHYS,MACLENNAN LABS,TORONTO,ON M5S 1A7,CANADA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1996年 / 278卷 / 01期
关键词：
accretion; accretion discs; instabilities; binaries; close; stars; formation; pre-main-sequence;
D O I：
10.1093/mnras/278.1.L23
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We show that outside-in disc instabilities, which can produce rapid-rise FU Orionis outbursts in T Tauri systems, are a natural consequence of the existence of protoplanetary/protostellar companions. The protoplanetary/protostellar companion would be formed through gravitational instability on a dynamical time-scale (similar to 10(5) yr), and, provided that it was formed at less than a few au, it would be swept in to similar to 15 R. in less than 10(5) yr. A companion of mass 10(-2) M. at this radius would act as a flood gate which stores material upstream and periodically releases it following the ignition of the thermal ionization instability.
引用
收藏
页码：L23 / L27
页数：5
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