[TCA Student Seminar] Probing the Magnetic Field Structure of the Protoplanetary Disk in HD 163296
The NCTS Astrophysics group (TG2.3) is holding the monthly student seminar series. These provide opportunities for the domestic students to share their work and practice giving live talks.
Please find the schedule listed in the tabulation below. Each seminar starts at 12 p.m. and takes place in the NCTS Physics 4F Lecture Hall, Cosmology Hall, NTU.
For more detailed information regarding each seminar, please see it in the section below the tabulation a week before the seminar.
| 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 | Jyun-Heng Lin | NTHU/ASIAA | Chin-Fei 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 | |||
| 2025/12/26 | Szu-Ting Chen | NTHU | Shin-Ping Lai | Afif Ismail | NTNU | Hung-Yi Pu |
Time: 2025/11/28 (Fri.) 12:00-12:30
Place: NCTS Physics 4F Lecture Hall, Cosmology Hall, NTU
Talk Title: Probing the Magnetic Field Structure of the Protoplanetary Disk in HD 163296
Speaker: Yu-Xuan Nancy Lin (NYCU)
Abstract:
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.
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