Delivery of Gas onto the Circumplanetary Disk of Giant Planets: Planetary-mass Dependence of the Source Region of Accreting Gas and Mass Accretion Rate
Delivery of Gas onto the Circumplanetary Disk of Giant Planets: Planetary-mass Dependence of the Source Region of Accreting Gas and Mass Accretion Rate
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DOI：
10.3847/1538-4357/ac7ddf
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发表时间：
2022-07
期刊：
影响因子：
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通讯作者：
Natsuho Maeda;K. Ohtsuki;T. Tanigawa;M. Machida;R. Suetsugu
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作者：
Natsuho Maeda;K. Ohtsuki;T. Tanigawa;M. Machida;R. Suetsugu
行星盘上的气体吸积和吸积气体的源区对于揭示导致巨行星周围卫星形成的尘埃吸积非常重要。我们对行星周围的等温和无粘气体流进行了局部三维高分辨率流体动力学模拟，以研究气体吸积带宽和气体吸积速率对环行星盘的行星质量依赖性。我们研究了在5.2 Au处对应于M p = 0.05- 1 M Jup的各种行星质量的情况，其中M Jup是当前的木星质量。我们发现，在低质量区，吸积带的径向宽度与Mp（1/6）成正比，而在高质量区，吸积带的径向宽度与Mp（1/6）成正比。我们发现，无论行星质量的情况下，我们检查的质量吸积率的比到环行星盘到希尔球是约0.4。结合我们的结果和全球流体动力学模拟得到的差距模型，我们得到了一个半解析的环行星盘的质量吸积率公式。我们发现，我们的三维吸积率的质量依赖性是相同的先前获得的二维情况下，虽然吸积流到环行星盘的定性行为是完全不同的两种情况。
Gas accretion onto the circumplanetary disks and the source region of accreting gas are important to reveal dust accretion that leads to satellite formation around giant planets. We performed local three-dimensional high-resolution hydrodynamic simulations of an isothermal and inviscid gas flow around a planet to investigate the planetary-mass dependence of the gas accretion bandwidth and gas accretion rate onto circumplanetary disks. We examined cases with various planetary masses corresponding to M p = 0.05–1M Jup at 5.2 au, where M Jup is the current Jovian mass. We found that the radial width of the gas accretion band is proportional to Mp1/6 for the low-mass regime with M p ≲ 0.2M Jup while it is proportional to M p for the high-mass regime with M p ≳ 0.2M Jup. We found that the ratio of the mass accretion rate onto the circumplanetary disk to that into the Hill sphere is about 0.4 regardless of the planetary mass for the cases we examined. Combining our results with the gap model obtained from global hydrodynamic simulations, we derive a semi-analytical formula of mass accretion rate onto circumplanetary disks. We found that the mass dependence of our three-dimensional accretion rates is the same as the previously obtained two-dimensional case, although the qualitative behavior of accretion flow onto the circumplanetary disk is quite different between the two cases.