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arXiv 2103.14335astro-ph.SRastro-ph.EP
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六颗系外行星对巨分支上母星包络性质的未来影响

The future influence of six exoplanets on the envelope properties of their parent stars on the giant branches

Ivan Rapoport, Ealeal Bear, Noam Soker

备注：
Accepted for publication in MNRAS
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摘要：

我们研究了六个系外行星系统的恒星演化代码MESA的演化，并得出结论，他们可能会自旋的信封上的红巨星分支（RGB）或后来的渐近巨星分支（AGB）的质量损失过程可能成为非球形的程度，他们的母星。我们选取了六个观测到的半长轴为1-2AU的系外行星系统，利用MESA的双星模式跟踪系统的演化。在RGB上，有四个系统的恒星吞没了行星，在AGB上，有两个系统的恒星吞没了行星，这些系统进入了共同的包络演化（CEE）。在两个系外行星质量为Mp~ 10 MJ（MJ是木星质量）的系统中，行星的自转速度约为分离速度的10%。这种包层可能具有显著的非球形质量损失几何形状。在Mp~MJ的其他四个系统中，行星将包层旋转到约1-2%的分裂速度。即使在这些情况下，影响尘埃形成的包层中的磁活动也可能导致与球形质量损失的微小偏离。在AGB上的CEE的两种情况下，行星将能量沉积到包络上，相当于包络结合能的10%以上。我们预计这将导致非球形的质量损失，在每种情况下都会形成椭圆行星状星云。

英文摘要：

We study the evolution of six exoplanetary systems with the stellar evolutionary code MESA and conclude that they will likely spin-up the envelope of their parent stars on the red giant branch (RGB) or later on the asymptotic giant branch (AGB) to the degree that the mass loss process might become non-spherical. We choose six observed exoplanetary systems where the semi-major axis is ~1-2AU, and use the binary mode of MESA to follow the evolution of the systems. In four systems the star engulfs the planet on the RGB, and in two systems on the AGB, and the systems enter a common envelope evolution (CEE). In two systems where the exoplanet masses are Mp~10MJ, where MJ is Jupiter mass, the planet spins-up the envelope to about 10% of the break-up velocity. Such envelopes are likely to have significant non-spherical mass loss geometry. In the other four systems where Mp~MJ the planet spins-up the envelope to values of ~1-2% of break-up velocity. Magnetic activity in the envelope that influences dust formation might lead to a small departure from spherical mass loss even in these cases. In the two cases of CEE on the AGB the planet deposits energy to the envelope that amounts to >10% of the envelope binding energy. We expect this to cause a non-spherical mass loss that will shape an elliptical planetary nebula in each case.

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