Spiral structure in the circumstellar disk around AB Aurigae

被引:137
作者
Fukagawa, M
Hayashi, M
Tamura, M
Itoh, Y
Hayashi, SS
Oasa, Y
Takeuchi, T
Morino, JI
Murakawa, K
Oya, S
Yamashita, T
Suto, H
Mayama, S
Naoi, T
Ishii, M
Pyo, TS
Nishikawa, T
Takato, N
Usuda, T
Ando, H
Iye, M
Miyama, SM
Kaifu, N
机构
[1] Univ Tokyo, Bunkyo Ku, Tokyo 1130033, Japan
[2] Natl Astron Observ Japan, Tokyo 1818588, Japan
[3] Natl Astron Observ Japan, Subaru Telescope, Hilo, HI 96720 USA
[4] Grad Univ Adv Studies, SOKENDAI, Sch Math & Phys Sci, Kanagawa 2400193, Japan
[5] Kobe Univ, Grad Sch Sci & Technol, Kobe, Hyogo 6578501, Japan
[6] Waseda Univ, Shinjuku Ku, Tokyo 1698555, Japan
[7] Sci Univ Tokyo, Shinjuku Ku, Tokyo 1628601, Japan
关键词
planetary systems : protoplanetary disks; stars : individual (AB Aurigae); stars : pre-main-sequence;
D O I
10.1086/420699
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a near-infrared image of the Herbig Ae star AB Aur obtained with the Coronagraphic Imager with Adaptive Optics mounted on the Subaru Telescope. The image shows a circumstellar emission extending out to a radius of r = 580 AU, with a double spiral structure detected at r = 200-450 AU. The surface brightness decreases as r(-3.0+/-0.1), steeper than the radial profile of the optical emission possibly affected by the scattered light from the envelope surrounding AB Aur. This result, together with the size of the infrared emission similar to that of the (CO)-C-13 (J = 1-0) disk, suggests that the spiral structure is indeed associated with the circumstellar disk but is not part of the extended envelope. We identified four major spiral arms, which are trailing if the brighter southeastern part of the disk is the near side. The weak gravitational instability, maintained for millions of years by continuous mass supply from the envelope, might explain the presence of the spiral structure at the relatively late phase of the pre-main-sequence period.
引用
收藏
页码:L53 / L56
页数:4
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