PDRs4All XVIII. JWST-NIRCam 流光特性研究奥尔特星云团原行星盘
PDRs4All XVIII. JWST-NIRCam Photometric properties of protoplanetary disks in the Orion Nebula Cluster
AI总结：
利用JWST-NIRCam高角分辨率图像研究奥尔特星云团原行星盘的流光特性，通过测量盘半径、识别解离前沿和电离前沿，确定Paschen α强度，建立盘类型分类体系，发现盘半径与投影距离成正比，且存在尘埃径向分离现象。
摘要：
我们利用PDRs4All计划和GTO计划1256的高角分辨率NIRCam图像，提取奥尔特星云团盘的关键特性。我们测量盘半径，识别解离前沿（DFs）和电离前沿（IFs），确定Paschen α强度，并推导近红外光谱能量分布（SEDs）。通过这些诊断，我们定义了ONC盘的类型学。类型I源显示靠近盘表面的合并IFs和DFs。类型II源的DFs位于盘表面，而IFs位于数十天文单位外。类型III源显示盘表面存在DF但无IF。所有类型中，PAH发射迹追踪PDR。我们发现盘半径r_disk随投影距离d_proj增加，遵循r_disk ∝ d_proj^0.30，符合盘被光蒸发截断。红外测量的盘半径大于毫米波长测量值，表明盘内存在尘埃径向分离。与PDR模型一致，盘PDR的热压随FUV辐射场G0增加，但斜率更平缓。最后，候选木星质量双星体（JuMBOs）的SED与类型III盘相似，除了JuMBO24，其SED类似类型I或II源，其SED与年轻低质量双星体伴带未解析电离盘一致。
英文摘要：
We use the high angular resolution NIRCam images from the PDRs4All program, combined with those of GTO program 1256, to extract key properties of disks in the Orion Nebula Cluster. We measure disk radii in silhouette against the bright background, identify dissociation fronts (DFs) and ionization fronts (IFs), determine Paschen $α$ intensities, and derive near-infrared spectral energy distributions (SEDs). From these diagnostics we define a typology of ONC disks. Type I sources show merged IFs and DFs close to the disk surface. Type II sources have DFs at the disk surface and IFs located tens of astronomical units away. Type III sources show a DF at the disk surface but no IF. For all types, PAH emission traces the PDR. We find that the disk radius $r_{\rm disk}$ increases with projected distance to the ionizing source $d_{\rm proj}$, following $r_{\rm disk} \propto d_{\rm proj}^{0.30}$, consistent with disk truncation by photoevaporation. Disk radii measured in the infrared are larger than those measured at millimeter wavelengths, suggesting radial dust segregation within the disks. In agreement with PDR models, the thermal pressure in the disk PDR increases with the FUV radiation field $G_0$, but with a flatter slope. Finally, the SEDs of candidate Jupiter Mass Binary Objects (JuMBOs) are similar to those of Type III disks, except for JuMBO24, which resembles a Type I or Type II source. Its SED is consistent with a young low-mass binary hosting an unresolved ionized disk.
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