ALMA Survey of Protoplanetary Disks in Lynds 1641

Sierra Grant(Boston University)

Mar 15, 2021

Protoplanetary disks contain the reservoirs of dust and gas that go into assembling planets. To build planets, a disk must contain enough mass to form planetary bodies, and the planet formation process must take place before the disk is depleted of material. We present new ALMA observations of 101 of the brightest protoplanetary disks in the region Lynds 1641 in the Orion Molecular Cloud A. Our ALMA observations include 1.3 mm continuum emission emitted by cold dust in the disk midplane, as well as spectral windows covering the J=2-1 transition of 12CO, 13CO, and C18O. We use the continuum emission to determine dust masses which we compare to protostars in L1641 and find a decrease in dust mass with evolutionary state. We also compare this sample to other regions surveyed in the (sub-)millimeter, including Taurus, Ophiuchus, Lupus, and Upper Scorpius. We find that Lynds 1641 has a relatively massive dust disk population compared to regions of similar and older ages. A large fraction (30%) of our sample has a dust mass equal to or greater than the minimum solar nebula. This survey highlights the potential uses of Lynds 1641 as a large population of young disks in a low-density region that is still proximal to high-mass star formation.

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