Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

P (Space and Planetary Sciences ) » P-CG Complex & General

[P-CG24] New Developments of Planetary Sciences with ALMA

Wed. May 29, 2019 10:45 AM - 12:15 PM 105 (1F)

convener:Takayuki Muto(Division of Liberal Arts, Kogakuin University), Munetake Momose(The College of Science, Ibaraki University), Hideo Sagawa(Faculty of Science, Kyoto Sangyo University), Masumi Shimojo(National Astronomical Observatory of Japan), Chairperson:Munetake MOMOSE(Ibaraki University)

10:45 AM - 11:00 AM

[PCG24-06] Probing dust aggregate structure in protoplanetary disks by millimeter-wave polarization

*Ryo Tazaki1, Hidekazu Tanaka1, Takayuki Muto2, Akimasa Kataoka3, Satoshi Okuzumi4 (1.Tohoku University, 2.Kogakuin University, 3.NAOJ, 4.Tokyo Institute of Technology)

Keywords:Protoplanetary disks, Millimeter-wave polarization, Dust

Dust coagulation in protoplanetary disks is the first step of planetesimal formation and a pathway from dust aggregates to planetesimals remains unclear. Both laboratory and numerical studies have so far shown that the structure of a dust aggregate plays important roles in planetesimal formation. However, the aggregate structure has been poorly constrained by disk observations. Recently, ALMA opens a new window to observe (sub-)millimeter-wave polarization of disks, which is expected to provide additional constraints on dust aggregate properties. In this study, we perform 3D radiative transfer simulations in order to study how the structure of dust aggregates affects millimeter-wave polarization from disks. As a result, it is found that relatively compact particles are favorable to explain observed millimeter-wave scattering polarization of disks, whereas highly porous and fractal particles fail to explain the observations.