Poster Presentation

ALMA observations of Class 0 protostars reveal disk growth in Serpens Main

Author(s): Yusuke Aso (ASIAA); Naomi Hirano (ASIAA); et al.

Presenter: Yusuke Aso (ASIAA)

We observed three protostars, SMM11, SMM4a1, and SMM4a2, in the Serpens Main cluster forming region in 1.3 mm continuum, 12CO J=2-1 line, and C18O J=2-1 line using ALMA during its Cycle 3. These three protostars are deeply embedded, and not detected as a point source even in 70 um by Herschel. Their bolometric temperatures indicate that all of them are in the Class 0 stage. Our ALMA data clearly show, however, that these three protostars have different physical and chemical properties. The continuum visibilities suggest that the disk with a radius of ~200 AU has already formed in SMM4a1. On the other hand, SMM4a2 contains an embedded point source surrounded by a spherical envelope, and SMM11 is surrounded by a spherical envelope without embedded point source. These results suggest disk growth among the three protostars: SMM4a1 has the most evolved disk, SMM4a2 possibly has an unresolved disk, and SMM11 is the youngest without such disks. This is also supported by C18O abundance and opening angles of their 12CO outflows. The three Class 0 protostars are, therefore, potentially good targets for investigating the relation between disk formation and B-fields/turbulence in future observations.