Are inner disc misalignments common? ALMA reveals an isotropic outer disc inclination distribution for young dipper stars
Are inner disc misalignments common? ALMA reveals an isotropic outer disc inclination distribution for young dipper stars
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DOI：
10.1093/mnras/stz3361
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发表时间：
2020-02-01
影响因子：
4.8
通讯作者：
Rizzuto, A. C.
中科院分区：
文献类型：
--
作者：
Ansdell, M.;Gaidos, E.;Rizzuto, A. C.
北斗七星是一类常见的年轻变星，表现出一整天的暗淡，最深可达几十%。一种标准的解释是，勺子上有接近边缘(i(D)约为70度)的原行星盘，这使得ALMA能够分辨出近距离(10au)的盘，并且在原行星阶段，内部盘的不对准可能是常见的。造成北斗七星现象的机制可能不止一种，包括吸积驱动的翘曲和倾斜的(次)恒星或行星伴星造成的“破碎”圆盘。
Dippers are a common class of young variable star exhibiting day-long dimmings with depths of up to several tens of per cent. A standard explanation is that dippers host nearly edge-on (i(d) approximate to 70 degrees) protoplanetary discs that allow close-in (10 au) disc resolved by ALMA and that inner disc misalignments may be common during the protoplanetary phase. More than one mechanism may contribute to the dipper phenomenon, including accretion-driven warps and 'broken' discs caused by inclined (sub-)stellar or planetary companions.