arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.3772astro-ph.EPastro-ph.SR
收藏

转捩前原行星的结构研究Ⅰ:PDS 70系统盘+腔的辐射转移模拟

The Structure of Pre-transitional Protoplanetary Disks I: Radiative Transfer Modeling of the Disk+Cavity in the PDS 70 system

Ruobing Dong, Jun Hashimoto, Roman Rafikov, Zhaohuan Zhu, Barbara Whitney, Tomoyuki Kudo, Takayuki Muto, Timothy Brandt, Melissa K. McClure, John Wisniewski, L.… 展开作者

Ruobing Dong, Jun Hashimoto, Roman Rafikov, Zhaohuan Zhu, Barbara Whitney, Tomoyuki Kudo, Takayuki Muto, Timothy Brandt, Melissa K. McClure, John Wisniewski, L. Abe, W. Brandner, J. Carson, S. Egner, M. Feldt, M. Goto, C. Grady, O. Guyon, Y. Hayano, M. Hayashi, S. Hayashi, T. Henning, K. W. Hodapp, M. Ishii, M. Iye, M. Janson, R. Kandori, G. R. Knapp, N. Kusakabe, M. Kuzuhara, J. Kwon, T. Matsuo, M. McElwain, S. Miyama, J. -I. Morino, A. Moro-Martin, T. Nishimura, T. -S. Pyo, G. Serabyn, H. Suto, R. Suzuki, M. Takami, N. Takato, H. Terada, C. Thalmann, D. Tomono, E. Turner, M. Watanabe, T. Yamada, H. Takami, T. Usuda, M. Tamura

摘要:

通过详细的辐射转移模型,我们提出了一个磁盘+腔模型,同时解释SED和斯巴鲁H波段偏振光成像的前过渡原行星盘PDS 70。特别是,我们不仅能够匹配散射光的表面亮度的径向依赖性,而且还能够匹配绝对尺度。我们的磁盘模型有一个腔65 AU的半径,这是严重耗尽的亚微米大小的尘埃颗粒,和一个小的残留内盘产生一个弱的,但仍然光学厚的近红外过量的SED。为了解释斯巴鲁图像中空腔边缘的对比度,空腔内亚微米尺寸的灰尘需要消耗约1000的因子。由于缺乏长波长观测和尘埃模型的不确定性,尘埃盘的总质量可能在1 e-4 M_sun的数量级上,只有弱约束。亚微米级尘埃在腔边缘的尺度高度约为6 AU,在H波段,腔壁在垂直方向上是光学厚的。PDS 70不是Dong等人(2012年)确定的(前)过渡盘类的成员,其成员仅显示毫米级尘埃中的空腔证据,而不是分辨率图像中的亚微米级尘埃。这两类(前)过渡盘可能是通过不同的机制形成的,也可能只是在盘清除过程中处于不同的演化阶段。

英文摘要:

Through detailed radiative transfer modeling, we present a disk+cavity model to simultaneously explain both the SED and Subaru H-band polarized light imaging for the pre-transitional protoplanetary disk PDS 70. Particularly, we are able to match not only the radial dependence, but also the absolute scale, of the surface brightness of the scattered light. Our disk model has a cavity 65 AU in radius, which is heavily depleted of sub-micron-sized dust grains, and a small residual inner disk which produces a weak but still optically thick NIR excess in the SED. To explain the contrast of the cavity edge in the Subaru image, a factor of ~1000 depletion for the sub-micron-sized dust inside the cavity is required. The total dust mass of the disk may be on the order of 1e-4 M_sun, only weakly constrained due to the lack of long wavelength observations and the uncertainties in the dust model. The scale height of the sub-micron-sized dust is ~6 AU at the cavity edge, and the cavity wall is optically thick in the vertical direction at H-band. PDS 70 is not a member of the class of (pre-)transitional disks identified by Dong et al. (2012), whose members only show evidence of the cavity in the millimeter-sized dust but not the sub-micron-sized dust in resolved images. The two classes of (pre-)transitional disks may form through different mechanisms, or they may just be at different evolution stages in the disk clearing process.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑