Date & Time: 2026/June/25 17:00-18:00, Venue: Zoom TV Conference System. This is an informal seminar on the formation of stars and planets. We welcome anyone interested in the subject.
Abstract:
Massive stars are known to be accompanied by circumstellar disks during their formation. Such massive protostellar disks are characterized by high mass accretion rates, likely sustained by angular momentum transport due to gravitational instability. Recent observational and theoretical studies suggest that dust growth occurs in these environments. Dust growth alters the radiative properties at (sub)millimeter wavelengths, introducing uncertainties in the inference of disk properties. In addition, dust growth enhances the cooling efficiency of the disk, which can significantly affect disk evolution. However, studies that consider the co-evolution of dust grains and massive protostellar disks are still lacking. We present the first self-consistent investigation of dust growth and the associated disk evolution in massive protostellar disks using numerical hydrodynamic simulations in the thin-disk approximation. We find that dust grains rapidly grow to sizes several orders of magnitude larger than those in the interstellar medium shortly after disk formation. Furthermore, enhanced cooling due to dust growth strengthens gravitational instability and promotes disk fragmentation more effectively, leading to more frequent luminosity outbursts with durations and strengths comparable to those observed in massive protostars. These results suggest that dust growth may facilitate episodic luminosity bursts in massive protostars and may also promote binary or multiple star formation through disk fragmentation.
Finally, I will provide a brief overview of the newly obtained high-angular-resolution ALMA Band 3 polarization observation of the massive protostellar disk GGD27-MM1, led by our team, and highlight some preliminary results.
他、会議報告、速報など、飛び入りも歓迎します。今回もしくは次回以降、話題提供できる方は世話人までメールしていただけましたら幸いです。
Participants:, Affiliations:
次回：TBD
連絡世話人：冨永遼佑（東京科学大学） tominaga.r.aa[at]m.titech.ac.jp