Protoplanetary Disks in the Orion OMC1 Region Imaged with ALMA
J. A. Eisner, J. M. Bally, A. Ginsburg, P. D. Sheehan

TL;DR
This study uses ALMA to observe protoplanetary disks in the Orion OMC1 region, detecting dust emission in a subset of young stars and analyzing disk mass distribution and gas content.
Contribution
First ALMA survey of protoplanetary disks in Orion OMC1, providing insights into disk mass and gas-to-dust ratios in a dense star-forming region.
Findings
Approximately 20% of proplyds show detectable dust emission.
Detected disks have masses >1.5 M_J, but no gas emission detected.
Gas-to-dust ratios may be lower than standard assumptions.
Abstract
We present ALMA observations of the Orion Nebula that cover the OMC1 outflow region. Our focus in this paper is on compact emission from protoplanetary disks. We mosaicked a field containing near-IR-identified young stars, around which we can search for sub-mm emission tracing dusty disks. Approximately 100 sources are known proplyds identified with HST. We detect continuum emission at 1 mm wavelengths towards of the proplyd sample, and of the larger sample of near-IR objects. The noise in our maps allows 4 detection of objects brighter than mJy, corresponding to protoplanetary disk masses larger than 1.5 M (using standard assumptions about dust opacities and gas-to-dust ratios). None of these disks are detected in contemporaneous CO(2-1) or CO(2-1) observations, suggesting that the gas-to-dust ratios may be…
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