Starspot-Induced Radial Velocity Variability in LkCa 19
Starspot-Induced Radial Velocity Variability in LkCa 19
复制标题
LkCa 19 中星黑子引起的径向速度变化
DOI：
10.1086/526415
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
D. Jaffe
中科院分区：
文献类型：
--
作者：
M. Huerta;C. Johns–Krull;L. Prato;P. Hartigan;D. Jaffe
We describe a new radial velocity survey of T Tauri stars and present the first results. Our search is motivated by an interest in detecting massive young planets, as well as investigating the origin of the brown dwarf desert. As part of this survey, we discovered large-amplitude, periodic, radial velocity variations in the spectrum of the weak-line T Tauri star LkCa 19. Using line bisector analysis and a new simulation of the effect of starspots on the photometric and radial velocity variability of T Tauri stars, we show that our measured radial velocities for LkCa 19 are fully consistent with variations caused by the presence of large starspots on this rapidly rotating young star. These results illustrate the level of activity-induced radial velocity noise associated with at least some very young stars. This activity-induced noise will set lower limits on the mass of a companion detectable around LkCa 19 and similarly active young stars.
