TRANSIT PROBABILITIES FOR STARS WITH STELLAR INCLINATION CONSTRAINTS
TRANSIT PROBABILITIES FOR STARS WITH STELLAR INCLINATION CONSTRAINTS
复制标题
具有恒星倾角约束的恒星凌日概率
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
S. Seager
中科院分区：
文献类型：
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作者：
T. Beatty;S. Seager
对于轨道较近的行星，系外行星凌日宿主恒星的概率很高，但对于半长轴的增加，这一概率会迅速下降。这使得围绕明亮恒星运行的大半长轴行星的凌日观测变得不切实际，因为人们需要连续观测散布在整个天空中的数百颗恒星。使这样的调查易于处理的一种方法是提前限制恒星旋转轴的倾角，从而提高凌日概率。考虑到行星系统倾角的合理范围，我们推导了具有恒星倾角约束的恒星凌日概率。我们发现，恒星倾角约束可以将适居带行星的凌日概率提高近一个数量级。当应用于恒星集合时，这种限制大大降低了在目标凌日调查中需要观察的恒星数量。我们还考虑了多行星系统，其中只有一颗行星具有确定的凌日，并在假定行星相互倾斜度的范围内推导出第二颗行星的凌日概率。
The probability that an exoplanet transits its host star is high for planets in close orbits, but drops off rapidly for increasing semimajor axes. This makes transit surveys for planets with large semimajor axes orbiting bright stars impractical, since one would need to continuously observe hundreds of stars that are spread out over the entire sky. One way to make such a survey tractable is to constrain the inclination of the stellar rotation axes in advance, and thereby enhance the transit probabilities. We derive transit probabilities for stars with stellar inclination constraints, considering a reasonable range of planetary system inclinations. We find that stellar inclination constraints can improve the transit probability by almost an order of magnitude for habitable-zone planets. When applied to an ensemble of stars, such constraints dramatically lower the number of stars that need to be observed in a targeted transit survey. We also consider multiplanet systems where only one planet has an identified transit and derive the transit probabilities for the second planet assuming a range of mutual planetary inclinations.