多仪器多波长高角分辨率研究MWC614：盘腔内的量子加热粒子
A multi-instrument and multi-wavelength high angular resolution study of MWC614: quantum heated particles inside the disk cavity
摘要：
对年轻星体的高角分辨率观测是研究大部分行星形成的原行星盘内部天文单位所必需的。随着它们的进化，内部盘区域的间隙打开，并且盘在约10百万年内完全分散。MWC 614是一个过渡前的天体，具有约10 au的半径间隙。我们提出了一套高角分辨率观测这个对象，包括SPHERE/ZIMPOL偏振和日冕图像在可见光，KECK/NIRC 2近红外孔径掩蔽观测和VLTI（琥珀色，琥珀色，和PIONIER）和CHARA（CLASSIC和CLIMB）在红外波长的长基线干涉测量。我们发现所有的观测结果都与倾斜圆盘（i ~ 55度，位置角~20- 30度）相容。中红外数据集证实了盘的内缘距离中心恒星12.3+/-0.4 au。我们确定了一个空腔内的同伴的质量上限为0.34兆太阳。在腔内，通常与尘埃升华区域相关的近红外发射异常地延伸（~10 au，比理论升华半径大30倍），并指示高尘埃温度（T~1800 K）。作为同伴诱导尘埃分离的可能结果，量子加热的尘埃颗粒可以解释这种高温下的扩展近红外发射。我们的观察证实了这个物体的特殊状态，内部的圆盘已经被吸积到恒星上，暴露出空腔内的小颗粒直接受到恒星辐射。
英文摘要：
High angular resolution observations of young stellar objects are required to study the inner astronomical units of protoplanetary disks in which the majority of planets form. As they evolve, gaps open up in the inner disk regions and the disks are fully dispersed within ~10 Myrs. MWC 614 is a pre-transitional object with a ~10au radius gap. We present a set of high angular resolution observations of this object including SPHERE/ZIMPOL polarimetric and coronagraphic images in the visible, KECK/NIRC2 near-infrared aperture masking observations and VLTI (AMBER, MIDI, and PIONIER) and CHARA (CLASSIC and CLIMB) long-baseline interferometry at infrared wavelengths. We find that all the observations are compatible with an inclined disk (i ~55deg at a position angle of ~20-30deg). The mid-infrared dataset confirms the disk inner rim to be at 12.3+/-0.4 au from the central star. We determined an upper mass limit of 0.34 Msun for a companion inside the cavity. Within the cavity, the near-infrared emission, usually associated with the dust sublimation region, is unusually extended (~10 au, 30 times larger than the theoretical sublimation radius) and indicates a high dust temperature (T~1800 K). As a possible result of companion-induced dust segregation, quantum heated dust grains could explain the extended near-infrared emission with this high temperature. Our observations confirm the peculiar state of this object where the inner disk has already been accreted onto the star exposing small particles inside the cavity to direct stellar radiation.
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