ASIAA Summer Students Program
ASIAA Summer Student Program 2021
July 1 - August 31

2021 Project Description

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Early grain growth for planet formation in protostellar disk

Protostellar disk
Radio Astronomy
Star and Planet formation


Chin-Fei Lee
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Task Description and Goals

HH 212 is a young protostellar system in the early phase of star formation in Orion at a distance of ~ 400 pc. It has a nearly edge-on and vertically resolved disk optimal to search for an early grain growth for planet formation. The disk is rotationally supported, surrounding a protostar with a mass of ~ 0.25 Msun. Dust polarization has been detected in the disk with ALMA in submillimeter wavelength at ∼ 875 μm, and it can be due to either dichroic extinction by grains aligned magnetically by poloidal fields or dust self-scattering by grains with a maximum size up to 100 μm in the disk. Both of these possibilities have important implications. If it is the former, then it means poloidal fields have been dragged into the disk and can play a role in both the disk evolution and the disk-wind launching. If it is the latter, then it means the grains have grown from ~ 0.1 μm in the interstellar medium (ISM) to 100 μm in the outer disk, and this grain growth can facilitate an earlier start of planet formation in the early phase of star formation.

In this project, we will model the ALMA dust polarization results of the disk with RADMC-3D code and search for any early grain growth for planet formation in the disk.

Required Background

Unix/Linux experience, Python Scripting, Fortran 90. Fundamental knowledge of physics, particularly Newtonian mechanics. Skills will be acquired: Radiative transfer with dichroic extinction and dust self-scattering

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