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arXiv 1805.00596astro-ph.EP
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热木星WASP-12 b星周气盘的形成

Generation of a Circumstellar Gas Disk by Hot Jupiter WASP-12b

Alex Debrecht, Jonathan Carroll-Nellenback, Adam Frank, Luca Fossati, Eric G. Blackman, Ian Dobbs-Dixon

摘要:

对凌日系外行星的观测为探测系内环境提供了丰富的数据来源。在WASP-12系统中,除了极热的木星WASP-12 b的大气逃逸外,还观察到通常明亮的MgII h&k线中的宽低压。有人假设,一个半透明的星周云是由行星的外流形成的,导致了观察到的签名。我们对WASP-12的整个系统环境进行了3D流体动力学模拟,从各自的表面注入行星风和恒星风。我们发现,一个环面的密度足够高,以占缺乏镁II H&K线核心发射WASP-12可以在大约13年形成。我们还在行星轨道的不同点对莱曼α光谱进行了合成观测,这表明轨道上的所有点都发生了显著的吸收,而不仅仅是在过境期间,正如观测所表明的那样。

英文摘要:

Observations of transiting extra-solar planets provide rich sources of data for probing the in-system environment. In the WASP-12 system, a broad depression in the usually-bright MgII h&k lines has been observed, in addition to atmospheric escape from the extremely hot Jupiter WASP-12b. It has been hypothesized that a translucent circumstellar cloud is formed by the outflow from the planet, causing the observed signatures. We perform 3D hydrodynamic simulations of the full system environment of WASP-12, injecting a planetary wind and stellar wind from their respective surfaces. We find that a torus of density high enough to account for the lack of MgII h&k line core emission in WASP-12 can be formed in approximately 13 years. We also perform synthetic observations of the Lyman-alpha spectrum at different points in the planet's orbit, which demonstrate that significant absorption occurs at all points in the orbit, not just during transits, as suggested by the observations.

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