Re: NCTS Astrophysics Student Lunch Seminars [July to December 2025]
Dear colleagues,
This is a reminder of the NCTS student lunch seminar at 12pm in the Cosmology building (4F lecture hall).
Cheers, Min-Kai
On Fri, Nov 21, 2025 at 8:00 AM Min-Kai Lin mklin@asiaa.sinica.edu.tw wrote:
Dear colleagues,
We will have our monthly NCTS Astrophysics Student Lunch Seminars next Friday, 11/28, from 12pm in the 4F lecture room in the Cosmology Hall. Talk details are appended below. You can sign up for lunch boxes here:
https://forms.gle/HR4bCPXcrKasVjEf7
Please come and support our students.
Cheers, Min-Kai
Probing the Magnetic Field Structure of the Protoplanetary Disk in HD 163296 Yu-Xuan Nancy Lin (NYCU, supervisor: Shih-Ping Lai)
Magnetic fields are expected to play an important role in the evolution of protoplanetary disks, yet their structure remains difficult to measure. In this work, we investigate the magnetic field morphology of the HD 163296 disk using archival ALMA 870 μm polarization data. Although polarization is often attributed to magnetically aligned dust grains, recent studies indicate that dust self-scattering can produce comparable or even dominant polarization signals. To separate these mechanisms, we apply two approaches: (1) assuming a uniform self-scattering polarization angle and subtracting its contribution from the observed Stokes parameters, and (2) modeling disk density and temperature structures and simulating self-scattering with RADMC-3D. The residual polarization is then interpreted as tracing the magnetic field. Our results show that self-scattering dominates the observed polarization, while the magnetic contribution is weak and difficult to isolate. These findings underscore the challenges of using dust polarization to probe disk magnetic fields and motivate future studies with improved modeling and broader source samples.
On Mon, Jul 14, 2025 at 11:41 AM Min-Kai Lin mklin@asiaa.sinica.edu.tw wrote:
Dear colleagues,
The NCTS Astrophysics group is resuming our monthly student seminar series. These provide opportunities for our domestic students to share their work and practice giving live talks. The schedule for the rest of the year is appended below. Seminars begin at 12pm in the 4F lecture room in the Cosmology Hall on the NTU campus. Talks are open to all.
Sign up links for lunch boxes will become available from the NCTS seminar list a week before the talks:
https://phys.ncts.ntu.edu.tw/en/act/Seminars/seminars_TG2
Cheers, Min-Kai
Date Speaker 1 Affiliation Supervisor Speaker 2 Affiliation Supervisor 2025/7/24 Pon-Yin Wang TKU Hsi-An Pan 2025/8/22 Tsung-Han Chuang NTNU Yueh-Ning Lee 2025/9/26 Chiung-Yin Chang NTHU Hsiang-Yi Karen Yang Huan-Ping Chao NCKU Kwan-Lok Li 2025/10/31 Yi-Yang Lee NTHU Hsiang-Yi Karen Yang Prangsutip Cherdwongsung NTHU Ing-Guey Jiang 2025/11/28 Yu-Xuan Nancy Lin NYCU Shih-Ping Lai Tz-En Gau NTU Chia-Yu Hu 2025/12/26 Szu-Ting Chen NTHU Shin-Ping Lai Afif Ismail NTNU Hung-Yi Pu