PAH emission in protoplanetary disks - 물리천문학부 천문학전공

Colloquium

Astronomy Colloquium (2017 Fall Semester)

* Date: Sep 07
* Speaker: Ji-Yeon Seok (NAOC China)
* Title: PAH emission in protoplanetary disks
* Abstract

In protoplanetary disks (PPDs) where new planets might form, a distinct set of broad emission features at 3.3, 6.2, 7.7, 8.6, 11.3, and 12.7 micron, is often detected, which is commonly attributed to polycyclic aromatic hydrocarbons (PAHs). In this talk, I will present our systematic study of PAH emission in PPDs using the infrared spectra of 69 PPDs around 14 T Tauri and 55 Herbig Ae/Be stars. We modeled these emission features in terms of astronomical PAHs and derived the size distribution and the charge state of the PAHs. These PAH properties are correlated with the stellar properties such as stellar effective temperature, luminosity, and mass. We found that the characteristic size of the PAHs tends to correlate with the effective temperatures, which can be explained by the preferential photodissociation of small PAHs. At the end of the talk. I will briefly explain our ongoing project to develop a PAH spectral and band-ratio library and introduce the Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) in China.

Date	Speaker	Title	Remarks
Sep 07	Ji-Yeon Seok (NAOC China)	PAH emission in protoplanetary disks
Sep 14	Jeongwoo Lee (Astronomy program, SNU)	The Total Solar Eclipse in 2017
Sep 21	Sang Gak Lee (College of Natural Sciences, SNU)	Spectroscopic Observation with NYSC 1 m Telescope
Sep 28	David Parkinson (KASI)	Tests of fifth forces using large-scale structure
Oct 05/Oct 12		[Chuseok]/[KAS Fall Meeting]
Oct 17	Tali Palma (UAB Santiago, Chile)	VVV Survey and Milky Way Globular Clusters	Tuesday
Oct 19	Nai-Hwa Chen (KASI)	Energetic particles at the Sun
Oct 26	Roberto Decarli (INAF, Italy)	The interstellar medium at high redshift
Nov 02	Christophe Pichon (IAP, France)	Connecting Large Scale Structures to Galaxy morphology
Nov 09	Northrup Grumman Korea	James Webb Space Telescope Roadshow
Nov 16	Hyunseok Jung (SNU Physics Department)	From Schrödinger’s Cat to Quantum Information Technology
Nov 23	Seon-Hee Seo (SNU Physics Department)	Neutrinos Oscillations: Past, Present and Future
Nov 30	Nobuo Arimoto (NAOJ / SNU)	A Hyper Suprime-Cam View of the Interacting Galaxies of the M81 Group – Structures and Stellar Populations
Dec 07	Taysun Kimm (Yonsei University)	Modeling stellar feedback in galaxy formation simulations: where do we stand?
Jan 10	Paul Yun (NASA Ambassador)	NASA Planetary Science Division Vision 2050	wednesday

2017 Fall semester detail