KIC 8462852: TRANSIT OF A LARGE COMET FAMILY
KIC 8462852: TRANSIT OF A LARGE COMET FAMILY
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KIC 8462852：大型彗星家族的凌日
DOI：
10.3847/2041-8205/819/2/l34
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
A. Quillen
中科院分区：
文献类型：
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作者：
Eva H. L. Bodman;A. Quillen
我们研究了在KIC 8462852光变曲线中观测到的不寻常凌日的彗星源的可解释性。一颗与我们太阳系中的彗星大小相似的彗星产生的凌日深度约为10−3，持续时间不到一天，这比观测到的最大倾角要小得多，也要短得多（20%？）但是一个大的，紧密移动的彗星群可以符合观测到的深度和持续时间。我们发现，一系列的大彗星群，除了一个在同一轨道上，提供了一个很好的适合KIC 8462852数据在季度16和17，但不能解释在季度8观察到的大倾角。然而，凌日倾角只是松散地限制了轨道，可以用近星点相差10倍的星群来拟合。为了达到0.2的过境深度，如果彗星半径为100公里，则需要在一个近距离的300个彗星群中，如果它们半径为100公里，则需要在一个近距离的300个彗星群中。所有倾角所需的彗星总数为1070 - 100 km或10700 - 10 km彗星。一个来自潮汐破坏的谷神星大小的祖先或后期重轰炸时期开始的单一彗星家族解释了不寻常的KIC 8462852光变曲线的最后2060天。
We investigate the plausibility of a cometary source of the unusual transits observed in the KIC 8462852 light curve. A single comet of similar size to those in our solar system produces a transit depth of the order of 10−3 lasting less than a day which is much smaller and shorter than the largest dip observed ( ∼ 20 % ?> for ∼3 days), but a large, closely traveling cluster of comets can fit the observed depths and durations. We find that a series of large comet swarms, with all except one on the same orbit, provides a good fit for the KIC 8462852 data during Quarters 16 and 17, but does not explain the large dip observed during Quarter 8. However, the transit dips only loosely constrain the orbits and can be fit by swarms with periastrons differing by a factor of 10. To reach a transit depth of ∼0.2, the comets need to be in a close group of ∼30, if they are ∼100 km in radius or in a group of ∼300 if they are ∼10 km in radius. The total number of comets required to fit all of the dips is ∼70 ∼ 100 km or ∼700 ∼ 10 km comets. A single comet family from a tidally disrupted Ceres-sized progenitor or the start of a Late Heavy Bombardment period explains the last ∼60 days of the unusual KIC 8462852 light curve.