ACCRETING CIRCUMPLANETARY DISKS: OBSERVATIONAL SIGNATURES
ACCRETING CIRCUMPLANETARY DISKS: OBSERVATIONAL SIGNATURES
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环行星盘的形成：观测特征
DOI：
10.1088/0004-637x/799/1/16
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Zhaohuan Zhu
中科院分区：
文献类型：
--
作者：
Zhaohuan Zhu
利用大气辐射传输模型计算了吸积环行星盘的光谱能量分布。只有在10−10 M☉ yr−1处围绕1 MJ行星吸积的环行星盘才可能比行星本身更亮。一个中等吸积的绕行星盘(足以在1 Mir内形成一颗10 MJ的行星)，其最高温度为∼2000 K，在近红外波段(J，H，K波段)，这个盘的亮度与晚M型棕矮星或具有“热启动”的10 MJ行星一样亮。为了使用直接成像来发现围绕低质量行星(例如，1MJ)的吸积盘并将它们与棕矮星或热的高质量行星区分开来，获得中红外波段(L、M、N波段)的光度测量是至关重要的，因为与棕矮星或行星相比，从环行星盘发出的辐射向更长的波长方向衰减的速度更慢。如果年轻行星具有强磁场(≳100 G)，磁场可能会缓慢地截断环绕行星盘()的吸积，并导致磁层吸积，这可以提供额外的吸积特征，例如来自吸积激波和线发射的紫外线/光学过剩。
I calculate the spectral energy distributions of accreting circumplanetary disks using atmospheric radiative transfer models. Circumplanetary disks only accreting at 10−10 M☉ yr−1 around a 1 MJ planet can be brighter than the planet itself. A moderately accreting circumplanetary disk (; enough to form a 10 MJ planet within 1 Myr) around a 1 MJ planet has a maximum temperature of ∼2000 K, and at near-infrared wavelengths (J, H, K bands), this disk is as bright as a late-M-type brown dwarf or a 10 MJ planet with a “hot start.” To use direct imaging to find the accretion disks around low-mass planets (e.g., 1 MJ) and distinguish them from brown dwarfs or hot high-mass planets, it is crucial to obtain photometry at mid-infrared bands (L′, M, N bands) because the emission from circumplanetary disks falls off more slowly toward longer wavelengths than those of brown dwarfs or planets. If young planets have strong magnetic fields (≳100 G), fields may truncate slowly accreting circumplanetary disks () and lead to magnetospheric accretion, which can provide additional accretion signatures, such as UV/optical excess from the accretion shock and line emission.
DOI：
10.1146/annurev-astro-081811-125523
发表时间：
2012-03
影响因子：
33.3
作者：
W. Kley;R. Nelson
通讯作者：
W. Kley;R. Nelson