Early Planet Formation in Embedded Disks (eDisk) XV: Influence of Magnetic Field Morphology in Dense Cores on Sizes of Protostellar Disks
The Astrophysical Journal(2024)
Abstract
The magnetic field of a molecular cloud core may play a role in the formation
of circumstellar disks in the core. We present magnetic field morphologies in
protostellar cores of 16 targets in the Atacama Large Millimeter/submillimeter
Array large program "Early Planet Formation in Embedded Disks (eDisk)", which
resolved their disks with 7 au resolutions. The 0.1-pc scale magnetic field
morphologies were inferred from the James Clerk Maxwell Telescope (JCMT) POL-2
observations. The mean orientations and angular dispersions of the magnetic
fields in the dense cores are measured and compared with the radii of the 1.3
mm continuum disks and the dynamically determined protostellar masses from the
eDisk program. We observe a significant correlation between the disk radii and
the stellar masses. We do not find any statistically significant dependence of
the disk radii on the projected misalignment angles between the rotational axes
of the disks and the magnetic fields in the dense cores, nor on the angular
dispersions of the magnetic fields within these cores. However, when
considering the projection effect, we cannot rule out a positive correlation
between disk radii and misalignment angles in three-dimensional space. Our
results suggest that the morphologies of magnetic fields in dense cores do not
play a dominant role in the disk formation process. Instead, the sizes of
protostellar disks may be more strongly affected by the amount of mass that has
been accreted onto star+disk systems, and possibly other parameters, for
example, magnetic field strength, core rotation, and magnetic diffusivity.
MoreTranslated text
Key words
Star formation,Interstellar magnetic fields,Star forming regions,Protostars,Circumstellar disks
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