Matryoshka洞：过渡盘Oph IRS 48中的嵌套发射环
Matryoshka Holes: Nested Emission Rings in the Transitional Disk Oph IRS 48
摘要：
形成过渡盘的过程--内部区域耗尽的盘--还没有得到很好的理解;可能的情况包括行星形成、晶粒生长和光蒸发。具有空间分辨的尘埃孔的气体是罕见的，但一般来说，对气体结构的了解更少。围绕A0星Oph IRS 48在附近的蛇夫座区域的磁盘有一个30 AU半径的洞以前检测到的18.7微米的尘埃连续体和温暖的CO在5微米的基本振转带。我们在这里介绍亚毫米阵列880微米连续成像解决内孔。然而，毫米尘埃中的洞半径只有13 AU，明显小于其他波长的测量值。圆盘的嵌套结构是违反直觉的，在毫米尘埃（12.9 + 1.7/-3.4 AU），5微米CO（30 AU）和18.7微米尘埃（峰值在55 AU）中看到越来越大的半径发射环。我们讨论了这种结构的可能的解释，包括自遮蔽，冷却磁盘表面层，CO的光解，和光蒸发。然而，要在严格的多波长空间限制下理解这个不寻常的圆盘，需要进一步的观测来寻找冷原子和分子气体。
英文摘要：
The processes that form transition disks - disks with depleted inner regions - are not well understood; possible scenarios include planet formation, grain growth and photoevaporation. Disks with spatially resolved dust holes are rare, but, in general, even less is known about the gas structure. The disk surrounding A0 star Oph IRS 48 in the nearby Rho Ophiuchus region has a 30 AU radius hole previously detected in the 18.7 micron dust continuum and in warm CO in the 5 micron fundamental ro-vibrational band. We present here Submillimeter Array 880 micron continuum imaging resolving an inner hole. However, the radius of the hole in the millimeter dust is only 13 AU, significantly smaller than measured at other wavelengths. The nesting structure of the disk is counter-intuitive, with increasingly large radii rings of emission seen in the millimeter dust (12.9 +1.7/-3.4 AU), 5 micron CO (30 AU) and 18.7 micron dust (peaking at 55 AU). We discuss possible explanations for this structure, including self-shadowing that cools the disk surface layers, photodissociation of CO, and photoevaporation. However, understanding this unusual disk within the stringent multi-wavelength spatial constraints will require further observations to search for cold atomic and molecular gas.
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