We present ALMA observations of 101 protoplanetary disks within the star-forming region Lynds 1641 in the Orion Molecular Cloud A. Our observations include 1.33 mm continuum emission and spectral windows covering the J = 2–1 transition of ¹²CO, ¹³CO, and C¹⁸O. We detect 89 protoplanetary disks in the dust continuum at the 4σ level (∼88% detection rate) and 31 in ¹²CO, 13 in ¹³CO, and 4 in C¹⁸O. Our sample contains 23 transitional disks, 20 of which are detected in the continuum. We target infrared-bright Class II objects, which biases our sample toward massive disks. We determine dust masses or upper limits for all sources in our sample and compare our sample to protostars in this region. We find a decrease in dust mass with evolutionary state. We also compare this sample to other regions surveyed in the (sub)millimeter and find that Lynds 1641 has a relatively massive dust disk population compared to regions of similar and older ages, with a median dust mass of M _⊕ and 27% with dust masses equal to or greater than the minimum solar nebula dust mass value of ∼30 M _⊕. We analyze the disk mass–accretion rate relationship in this sample and find that the viscous disk lifetimes are similar to the age of the region, though with a large spread. One object, [MGM2012] 512, shows a large-scale (>5000 au) structure in both the dust continuum and the three gas lines. We discuss potential origins for this emission, including an accretion streamer with large dust grains.

我们展示了 ALMA 对猎户座分子云 A 中恒星形成区域 Lynds 1641 内 101 个原行星盘的观测结果。我们的观测结果包括 1.33 mm 连续谱发射和覆盖¹² CO、¹³ CO 和 C的J = 2-1 跃迁的光谱窗口¹⁸ O。我们在 4 σ水平（~88% 检测率）的尘埃连续体中检测到 89 个原行星盘，在¹² CO 中检测到 31^个，在¹³ CO 中检测到^{13 个}，在 C ^{18 中检测}到 4^个O. 我们的样本包含 23 个过渡盘，其中 20 个在连续体中检测到。我们的目标是红外明亮的 II 类物体，这使我们的样本偏向于巨大的圆盘。我们确定样本中所有来源的尘埃质量或上限，并将我们的样本与该地区的原恒星进行比较。我们发现随着进化状态尘埃质量的减少。我们还将这个样本与在（亚）毫米范围内调查的其他地区进行了比较，发现与类似和年龄相近的地区相比，Lynds 1641 的尘埃盘数量相对较大，尘埃质量中位数为 M _⊕，27% 的尘埃质量为等于或大于最小太阳星云尘埃质量值 ∼30 M _⊕. 我们分析了这个样本中的圆盘质量-吸积率关系，发现粘性圆盘的寿命与该区域的年龄相似，但差异很大。一个天体，[MGM2012] 512，在尘埃连续体和三个气体线中都显示了一个大规模（> 5000 au）的结构。我们讨论了这种排放的潜在来源，包括带有大尘埃颗粒的吸积流光。