[Seminar]

～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～

Title: Study of circumstellar disks: Infrared interferometry and Monte-Carlo radiative transfer simulation.

Speaker: Dr. Lei Chen

Affiliation: Max Planck Institute for Radio Astronomy　

Time:  July 29, 2013 (Monday) 9:30 a.m.

Venue: Meeting Room 401 (Main Building)

Abstract:　

Circumstellar disks play a fundamental role in star formation and planet formation. Infrared interferometry provide an angular resolution of ~mas, and therefore a unique way to detect the innermost sub-AU region of the disks  around nearby young stellar objects (YSOs). Combining such high-spatial-resolution observations with numerical simulation of radiative transfer (RT) process, disk geometry and dust properties can be constrained. Herein I report the infrared interferometric observation of the Herbig Ae star HD144432, and the corresponding modeling work. With our Monte-Carlo radiative transfer simulation, we found a two-component structure of the disk, with an optically thin inner component from ~0.2AU to ~0.5AU, and an optically thick component from ~1AU to ~10AU. The gap region from ~0.5AU to ~1AU can either be opened by a giant planet, or be formed of dust coagulation. Small silicate grains are found to be abundant in the outer disk, but less so in the inner disk. This suggests coagulation of silicate grains.

～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～
　　请全体师生踊跃参加!

This notice can be also seen at web:
　　http://www.ynao.cas.cn/xwzx/xstg/
　　申请安排学术报告的同事请参见台学术报告管理办法：
　　http://www.ynao.cas.cn/xwzx/xstg/gzzd/

南方基地
　　丽江天文观测站
　　中国科学院天体结构与演化重点实验室
　　云南天文台学术委员会
　　2013-7-26