论文标题
年轻变量星RZ PSC的低质量恒星伴侣
A low-mass stellar companion to the young variable star RZ Psc
论文作者
论文摘要
RZ PSC是一颗年轻的阳光恒星，具有明亮暖的红外过量，偶尔会因偶尔灰尘结构而显着变暗。光学深度参数表明，调光事件不会通过偶尔灰尘探测典型的视线，而是由出现在光学较厚的中间平面上方的结构引起的。因此，该系统可能类似于外部磁盘被更靠近恒星所遮蔽的系统。在这里，我们报告发现RZ PSC在预计的23AU分离中托管0.12 $ m_ \ odot $ companion。我们得出的结论是，磁盘必须绕主要恒星绕。虽然我们没有检测到轨道运动，但是将主要的线性偏振角与同伴的天空位置角度进行比较提供了间接证据，表明伴侣和光盘可能无法共享相同的轨道平面。伴侣是否严重破坏椎间盘，截断或完全没有效果，都需要对伴侣和椎间盘进行进一步的观察。
RZ Psc is a young Sun-like star with a bright and warm infrared excess that is occasionally dimmed significantly by circumstellar dust structures. Optical depth arguments suggest that the dimming events do not probe a typical sight line through the circumstellar dust, and are instead caused by structures that appear above an optically thick mid-plane. This system may therefore be similar to systems where an outer disk is shadowed by material closer to the star. Here we report the discovery that RZ Psc hosts a 0.12$M_\odot$ companion at a projected separation of 23au. We conclude that the disk must orbit the primary star. While we do not detect orbital motion, comparison of the angle of linear polarization of the primary with the companion's on-sky position angle provides circumstantial evidence that the companion and disc may not share the same orbital plane. Whether the companion severely disrupts the disc, truncates it, or has little effect at all, will require further observations of both the companion and disc.
