SURFACE GEOMETRY OF PROTOPLANETARY DISKS INFERRED FROM NEAR-INFRARED IMAGING POLARIMETRY-猫眼课题宝

DOI：

10.1088/0004-637x/795/1/71

发表时间：

2014-09

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

M. Takami;Y. Hasegawa;T. Muto;P. Gu;R. Dong;J. Karr;J. Hashimoto;Nobuyuki Kusakabe;E. Chapillon;Ya-wen Tang;Y. Itoh;J. Carson;K. Follette;S. Mayama;M. Sitko;M. Janson;C. Grady;T. Kudo;E. Akiyama;J. Kwon;Yasuhiro H. Takahashi;T. Suenaga;L. Abe;W. Brandner;Timothy D. Brandt;T. Currie;S. Egner;M. Feldt;O. Guyon;Y. Hayano;M. Hayashi;S. Hayashi;T. Henning;K. Hodapp;M. Honda;M. Ishii;M. Iye;R. Kandori;G. Knapp;M. Kuzuhara;M. McElwain;T. Matsuo;S. Miyama;J. Morino;A. Moro-Martin;T. Nishimura;T. Pyo;E. Serabyn;H. Suto;R. Suzuki;N. Takato;H. Terada;C. Thalmann;D. Tomono;E. Turner;J. Wisniewski;Makoto Watanabe;Toru Yamada;H. Takami;T. Usuda;M. Tamura

我们提出了一种新的分析方法，用于确定使用Subaru-HiCIAO近红外成像偏振法观测到的五个原行星盘的表面几何形状。利用观测到的偏振强度（PI）分布、圆盘倾角、假设的粉尘散射特性和其他合理的近似值作为输入，我们计算了一个微分方程来推导表面几何形状。这个方程沿着给定位置角度与恒星的距离进行数值积分。我们发现，利用这些近似，螺旋臂（SAO 206462, MWC 758）和环（2MASS J16042165-2130284, PDS 70）的PI分布的局部最大值与圆盘表面的局部凹形结构有关。我们还表明，在散射光中观察到的内部间隙的存在仍然允许一个平行于恒星光路的圆盘表面的可能性，或者一个被内部半径结构遮蔽的圆盘。我们对环的分析并没有显示出一个垂直内壁的存在，而这通常是在研究有内部间隙的圆盘时所假定的。最后，我们总结了螺旋和环状结构作为正在进行的行星形成的潜在特征的含义。

We present a new method of analysis for determining the surface geometry of five protoplanetary disks observed with near-infrared imaging polarimetry using Subaru-HiCIAO. Using as inputs the observed distribution of polarized intensity (PI), disk inclination, assumed properties for dust scattering, and other reasonable approximations, we calculate a differential equation to derive the surface geometry. This equation is numerically integrated along the distance from the star at a given position angle. We show that, using these approximations, the local maxima in the PI distribution of spiral arms (SAO 206462, MWC 758) and rings (2MASS J16042165–2130284, PDS 70) are associated with local concave-up structures on the disk surface. We also show that the observed presence of an inner gap in scattered light still allows the possibility of a disk surface that is parallel to the light path from the star, or a disk that is shadowed by structures in the inner radii. Our analysis for rings does not show the presence of a vertical inner wall as often assumed in studies of disks with an inner gap. Finally, we summarize the implications of spiral and ring structures as potential signatures of ongoing planet formation.

SURFACE GEOMETRY OF PROTOPLANETARY DISKS INFERRED FROM NEAR-INFRARED IMAGING POLARIMETRY

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