Escaping Outflows from Disintegrating Exoplanets: Day-side versus Night-side Escape
Escaping Outflows from Disintegrating Exoplanets: Day-side versus Night-side Escape
复制标题
逃离正在瓦解的系外行星的流出物：白天逃逸与夜间逃逸
DOI：
10.3847/1538-4357/abcaa7
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
S. Seager
中科院分区：
文献类型：
--
作者：
W. Kang;F. Ding;R. Wordsworth;S. Seager
超热解体的系外行星已经被探测到，尾巴在它们后面或前面拖着。这些彗尾被认为是由尘埃构成的，这些尘埃是由从永久的白昼面发出的超音速逃逸流形成的。如果保持角动量，白天的逃逸通量会使行星进入轨道。为了解释观测中的拖尾现象，辐射压力被认为是必要的，辐射压力是一种将逃逸流推离主星的排斥力。我们在此研究逃逸是否会在压力梯度力的作用下转向远离主星。我们在一个理想化的框架中证明，夜晚的逃逸通量可能发生，有时甚至比白天的逃逸更强。夜侧逃逸推断出，即使没有辐射压力，由于角动量守恒，逃逸流也可能在轨道上落后于行星。我们还发现了昼侧和夜侧逃逸通量的解析近似，可用于研究崩解行星的行星演化。
Ultrahot disintegrating exoplanets have been detected with tails trailing behind and/or shooting ahead of them. These tails are believed to be made of dust that are formed out of the supersonic escaping flow that emanated from the permanent day side. Conserving angular momentum, this day-side escape flux would lead the planet in orbit. In order to explain the trailing tails in observation, radiation pressure, a repulsive force pushing the escape flow away from the host star, is considered to be necessary. We here investigate whether escape could be deflected to head away from the host star by the pressure gradient force. We demonstrate in an idealized framework that escape flux from the night side can occur, and sometimes, can be even stronger than the escape from the day-side. The night-side escape infers that escape flow could trail behind the planet in orbit by virtue of angular momentum conservation even without radiation pressure. We also find analytical approximations for both day-side and night-side escape fluxes, which may be applied to study planetary evolution of disintegrating planets.
热的超级地球大气的组成：探索开普勒候选者
DOI：
10.1088/2041-8205/742/2/l19
发表时间：
2011
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
Miguel;Kaltenegger;Fegley;Schaefer
通讯作者：
Schaefer
连接 55 Cancri e 的气候和热相位曲线
DOI：
10.3847/1538-4357/aa9328
发表时间：
2017
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Hammond M
通讯作者：
Hammond M