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We present ALMA observations of 101 protoplanetary disks within thestar-forming region Lynds 1641 in the Orion Molecular Cloud A. Our observationsinclude 1.33 mm continuum emission and spectral windows covering the J=2-1transition of $^{12}$CO, $^{13}$CO, and C$^{18}$O. We detect 89 protoplanetarydisks in the dust continuum at the 4$\sigma$ level ($\sim$88% detection rate)and 31 in $^{12}$CO, 13 in $^{13}$CO, and 4 in C$^{18}$O. Our sample contains23 transitional disks, 20 of which are detected in the continuum. We targetinfrared-bright Class II objects, which biases our sample towards massivedisks. We determine dust masses or upper limits for all sources in our sampleand compare our sample to protostars in this region. We find a decrease in dustmass with evolutionary state. We also compare this sample to other regionssurveyed in the (sub-)millimeter and find that Lynds 1641 has a relativelymassive dust disk population compared to regions of similar and older ages,with a median dust mass of 11.1$^{+32.9}_{-4.6}$ $M_\oplus$ and 27% with dustmasses equal to or greater than the minimum solar nebula dust mass value of$\sim$30 $M_\oplus$. We analyze the disk mass-accretion rate relationship inthis sample and find that the viscous disk lifetimes are similar to the age ofthe region, however with a large spread. One object, [MGM2012] 512, showslarge-scale ($>$5000 AU) structure in both the dust continuum and the three gaslines. We discuss potential origins for this emission, including an accretionstreamer with large dust grains.

An ALMA Survey of Protoplanetary Disks in Lynds 1641