Periodic photometric variability of the brown dwarf Kelu-1

被引：67
作者：
Clarke, FJ
Tinney, CG
Covey, KR
机构：
[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
[2] Anglo Australian Observ, Epping, NSW 2121, Australia
[3] Univ Washington, Dept Astron, Seattle, WA 98195 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2002年 / 332卷 / 02期
关键词：
techniques : photometric; stars : atmospheres; binaries : close; stars; low-mass; brown dwarfs; stars : oscillations; stars : rotation;
D O I：
10.1046/j.1365-8711.2002.05308.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have detected a strong periodicity of 1.80+/-0.05 h in photometric observations of the brown dwarf Kelu-1. The peak-to-peak amplitude of the variation is similar to1.1 per cent (11.9+/-0.8 mmag) in a 41-nm wide filter centred on 857 nm and including the dust/temperature-sensitive TiO and CrH bands. We have identified two plausible causes of variability: surface features rotating in to and out of view and so modulating the light curve at the rotation period; or ellipsoidal variability caused by an orbiting companion. In the first scenario, we combine the observed v sin i of Kelu-1 and standard model radius to determine that the axis of rotation is inclined at 65degrees+/-12degrees to the line of sight.
引用
收藏
页码：361 / 366
页数：6
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