On the detection of satellites of extrasolar planets with the method of transits
On the detection of satellites of extrasolar planets with the method of transits
复制标题
凌日法探测系外行星卫星的研究
DOI：
10.1051/aas:1999148
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
J. Schneider
中科院分区：
文献类型：
--
作者：
P. Sartoretti;J. Schneider
在假设观测时间至少与行星轨道周期一样长的条件下，用凌日法计算了太阳系外行星卫星的探测概率。我们将母行星经过和不经过星星的情况分开。假设可能的卫星的轨道半径在罗氏极限和希尔半径之间。我们发现，如果一颗卫星被扩展到足以使恒星的光变曲线产生可检测的下降，那么当这颗行星也经过星星时，检测到它的概率几乎是1。如果行星没有凌日，探测到类地行星或陆地卫星的可能性不大，但如果卫星的轨道半径很大，探测到行星的可能性就相当了。如果一颗卫星在凌日期间没有延伸到足以使恒星光变曲线产生可检测的下降，它仍然可以通过行星围绕行星-卫星系统的重心旋转而导致的行星凌日的时间偏移来检测。
We compute the detection probability of satel- lites of extrasolar planets with the method of transits, un- der the assumption that the duration of the observations is at least as long as the planet orbital period. We separate the cases when the parent planet does and does not also transit over the star. The possible satellites are assumed to have orbital radii between the Roche limit and the Hill radius. We nd that if a satellite is extended enough to produce a detectable drop in the stellar lightcurve, the probability to detect it when the planet also transits over the star is nearly unity. If the planet does not transit, the probability to detect a Jupiter-like or terrestrial satellite is modest, but it can be comparable to that of detecting a planet if the satellite orbital radius is large. If a satellite is not extended enough to produce a detectable drop in the stellar lightcurve during a transit, it might still be detected through the time shift of planetary transits resulting from the rotation of the planet around the barycenter of the planet-satellite system.