We present 880?μm images of the transition disk around the star [PZ99] J160421.7-213028, a solar mass star in the nearby Upper Scorpius association. With a resolution down to 034, we resolve the inner hole in this disk, and via model fitting to the visibilities and spectral energy distribution we determine both the structure of the outer region and the presence of sparse dust within the cavity. The disk contains ~0.1 M Jup of millimeter-emitting grains, with an inner disk edge of about 70?AU. The inner cavity contains a small amount of dust with a depleted surface density in a region extending from about 20 to 70?AU. Taking into account prior observations indicating little to no stellar accretion, the lack of a binary companion, and the presence of dust near ~0.1?AU, we determine that the most likely mechanism for the formation of this inner hole is the presence of one or more giant planets.
展开▼
机译：我们展示了附近的上天蝎座协会中一颗太阳质量恒星[PZ99] J160421.7-213028周围的880？m过渡盘图像。使用低至034的分辨率，我们解决了该盘中的内孔，并通过对可见性和光谱能量分布的模型拟合，确定了外部区域的结构以及腔体内稀疏粉尘的存在。圆盘包含〜0.1 M Jup的毫米发射颗粒，圆盘的内部边缘约为70？AU。内腔中的粉尘量少，表面密度在大约20至70？AU之间。考虑到先前的观察结果表明几乎没有星状增生，缺少二元伴星以及在〜0.1？AU附近存在粉尘，我们确定形成此内孔的最可能机制是存在一个或一个更巨型的行星。
展开▼
