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arXiv 2103.07673astro-ph.EPastro-ph.SR
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中等质量演化恒星周围原行星盘的光蒸发扩散

Photoevaporative Dispersal of Protoplanetary Disks around Evolving Intermediate-mass Stars

Masanobu Kunitomo, Shigeru Ida, Taku Takeuchi, Olja Panić, James M. Miley, Takeru K. Suzuki

摘要:

我们的目标是了解恒星演化对原行星盘演化的影响。我们特别关注的磁盘周围的中等质量(IM)的恒星,比低质量的演化更快的演化。我们数值求解了0.5-5太阳质量恒星周围的盘的长期演化,考虑粘性吸积和恒星远紫外(FUV),极紫外(EUV)和X射线辐射驱动的光蒸发(PE)。我们还考虑了恒星演化和PE率的时间演化。我们发现IM星的FUV,EUV和X射线光度随着恒星结构,恒星有效温度或吸积率的时间演化而在几个百万年内按数量级演化。因此,PE率也随时间的数量级,我们得出结论,恒星演化是至关重要的磁盘演化IM星周围。

英文摘要:

We aim to understand the effect of stellar evolution on the evolution of protoplanetary disks. We focus in particular on the disk evolution around intermediate-mass (IM) stars, which evolve more rapidly than low-mass ones. We numerically solve the long-term evolution of disks around 0.5-5 solar-mass stars considering viscous accretion and photoevaporation (PE) driven by stellar far-ultraviolet (FUV), extreme-ultraviolet (EUV), and X-ray emission. We also take stellar evolution into account and consider the time evolution of the PE rate. We find that the FUV, EUV, and X-ray luminosities of IM stars evolve by orders of magnitude within a few Myr along with the time evolution of stellar structure, stellar effective temperature, or accretion rate. Therefore, the PE rate also evolves with time by orders of magnitude, and we conclude that stellar evolution is crucial for the disk evolution around IM stars.

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