论文标题

阿尔玛对年轻爆发星的观察:连续磁盘大小和分子流出

ALMA Observations of Young Eruptive Stars: continuum disk sizes and molecular outflows

论文作者

Hales, Antonio S., Pérez, Sebastián, Gonzalez-Ruilova, Camilo, Cieza, Lucas A., Williams, Jonathan P., Sheehan, Patrick D., López, Cristián, Casassus, Simon, Principe, David A., Zurlo, Alice

论文摘要

We present Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm observations of four young, eruptive star-disk systems at 0.4" resolution: two FUors (V582 Aur and V900 Mon), one EXor (UZ Tau E) and one source with an ambiguous FU/EXor classification (GM Cha). The disks around GM Cha, V900 Mon and UZ Tau E are分辨率。到迄今为止,Alma观察到的磁盘大小和质量是较大的lupus,fuor磁盘的范围更大。将FU/EXOR样本与Ophiuchus中的I类和II类磁盘进行比较。与单星系统相比,二进制磁盘是更紧凑的磁盘,类似于非爆发的年轻磁盘符合Uz Tau E周围的经过良好磁盘的连续性和线数据的转移模型由Keplerian磁盘很好地描述,没有流出活动的证据(类似于其他exors),而不是在燃料中检测广泛的范围,而不是在当前的fuors accret eartion the Protion Intor Intor ieStre Interion Intore Intear Intear iNement Inte Inte Inte Inter(原球网(II类)阶段。

We present Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm observations of four young, eruptive star-disk systems at 0.4" resolution: two FUors (V582 Aur and V900 Mon), one EXor (UZ Tau E) and one source with an ambiguous FU/EXor classification (GM Cha). The disks around GM Cha, V900 Mon and UZ Tau E are resolved. These observations increase the sample of FU/EXors observed at sub-arcsecond resolution by 15%. The disk sizes and masses of FU/EXors objects observed by ALMA so far suggest that FUor disks are more massive than Class 0/I disks in Orion and Class II disks in Lupus of similar size. EXor disks in contrast do not seem to be distinguishable from these two populations. We reach similar conclusions when comparing the FU/EXor sample to the Class I and Class II disks in Ophiuchus. FUor disks around binaries are host to more compact disks than those in single-star systems, similar to non-eruptive young disks. We detect a wide-angle outflow around GM Cha in $^{12}$CO emission, wider than typical Class I objects and more similar to those found around some FUor objects. We use radiative transfer models to fit the continuum and line data of the well-studied disk around UZ Tau E. The line data is well described by a keplerian disk, with no evidence of outflow activity (similar to other EXors). The detection of wide-angle outflows in FUors and not in EXors support to the current picture in which FUors are more likely to represent an accretion burst in the protostellar phase (Class I), while EXors are smaller accretion events in the protoplanetary (Class II) phase.

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