Mid-infrared multi-wavelength imaging of Ophiuchus IRS 48 transitional disk

PASJ: Publications of the Astronomical Society of Japan

Onaka, Takashi¹  Honda, Mitsuhiko²  Swearingen, Jeremy R³  Okada, Kazushi⁴  Miyata, Takashi⁴  Ohsawa, Ryou⁴  Kamizuka, Takashi⁴  Mulders, Gijs D⁵  Yamashita, Takuya⁶  Uchiyama, Mizuho⁶  Fujiyoshi, Takuya⁷  Fujiwara, Hideaki⁷ 

[1] Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;Department of Physics, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka 830-0011, Japan;Department of Physics, University of Cincinnati, 400 Geology/Physics Building, P.O. Box 210011, Cincinnati, OH 45221-0377, USA;Institute of Astronomy, Graduate School of Science, The University of Tokyo, Osawa 2-21-1, Mitaka, Tokyo 181-0015, Japan;Lunar and Planetary Laboratory, The University of Arizona, Tucson, AZ 85721, USA;National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;Subaru Telescope, National Astronomical Observatory of Japan, 650 North A’ohoku Place, Hilo, Hawaii 96720, USA

关键词: protoplanetary disks;    planet-disk interactions;    stars: individual;   

DOI  :  10.1093/pasj/psy033

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Transitional disks around the Herbig Ae/Be stars are fascinating targets in the contexts of disk evolution and planet formation. Oph IRS 48 is one of such Herbig Ae stars, which shows an inner dust cavity and azimuthally lopsided large dust distribution. We present new images of Oph IRS 48 at eight mid-infrared (MIR) wavelengths from 8.59 to 24.6 μm taken with COMICS mounted on the 8.2 m Subaru Telescope. The N-band (7 to 13 μm) images show that the flux distribution is centrally peaked with a slight spatial extent, while the Q-band (17 to 25 μm) images show asymmetric double peaks (east and west). Using 18.8- and 24.6 μm images, we derived the dust temperature at both east and west peaks to be 135 ±  22 K. Thus, the asymmetry may not be attributed to a difference in the temperature. Comparing our results with previous modeling works, we conclude that the inner disk is aligned to the outer disk. A shadow cast by the optically thick inner disk has a great influence on the morphology of MIR thermal emission from the outer disk.

【 授权许可】

CC BY