论文标题
$β$ pictoris行星系统中的exocomets尺寸分布
Exocomets size distribution in the $β$ Pictoris planetary system
论文作者
论文摘要
恒星$β$ pictoris拥有一个年轻的行星系统，其特征是存在气态和尘土飞扬的碎屑盘，至少两个巨大的行星和许多次要的尸体。三十多年来，已经使用光谱法检测到恒星的外去核粉，探测了彗星昏迷和尾巴的气态部分。 可以通过对过渡的光度观测来进行尾巴的灰尘分量的检测。自2018年以来，过境系外行星调查卫星已经观察到$β$ PIC的总计156天。在这里，我们报告了对TESS光度数据集的分析，并鉴定了总共30次exocomets的转移。我们的统计分析表明，在光曲线中，过渡期外的事件（$ n $）作为吸收深度（$ ad $）的函数，遵循$ $ dn（ad）\ propto ad^{ - α} $的功率定律，其中$ a = 2.3 \ pm pm 0.4 $ 0.4 $ 0.4 $ 0.4 $。吸收深度的分布导致与$ r^{ - γ} $成比例的差异彗星尺寸分布，其中$γ= 3.6 \ pm 0.8 $，显示出与太阳能系统中彗星的尺寸分布的惊人相似性，以及碰撞的人群的分布（$γ__{\ rm d d} = 3.5} = 3.5 $）。
The star $β$ Pictoris harbors a young planetary system, which is characterized by the presence of a gaseous and dusty debris disk, at least two massive planets and many minor bodies. For more than thirty years, exocomets transiting the star have been detected using spectroscopy, probing the gaseous part of the cometary comas and tails. The detection of the dusty component of the tails can be performed through photometric observations of the transits. Since 2018, the Transiting Exoplanet Survey Satellite has observed $β$ Pic for a total of 156 days. Here we report an analysis of the TESS photometric data set with the identification of a total of 30 transits of exocomets. Our statistical analysis shows that the number of transiting exocomet events ($N$) as a function of the absorption depth ($AD$) in the light curve follows a power law in the form $dN(AD) \propto AD^{-α}$, where $α=2.3\pm 0.4$. This distribution of absorption depth leads to a differential comet size distribution proportional to $R^{-γ}$, where $γ=3.6 \pm 0.8$, showing a striking similarity to the size distribution of comets in the Solar system and the distribution of a collisionally relaxed population ($γ_{\rm D}= 3.5$).
