论文标题
非常低质量的恒星PAR-LUP3-4的双极分子流出
Bipolar molecular outflow of the very low-mass star Par-Lup3-4
论文作者
论文摘要
众所周知，非常低质量的恒星具有喷气机和流出，这表明了低质量星形形成的缩放版本。但是，在非常低的质量来源中只有很少的流出表征。我们表征了非常低的质量星PAR-LUP3-4的双极分子流出，一个0.12 m $ _ {\ odot} $对象已知可为光学喷射供电的对象。我们在第6和7带中观察到Alma的Par-Lup3-4，检测到连续体和CO分子气体。特别是，我们研究了三个主要排放线：CO（2-1），CO（3-2）和$^{13} $ CO（3-2）。我们的观察结果首次揭示了非常低质量恒星中双极分子流出的基础，以及垂直于该来源的主要流出的材料流。主要的流出形态与先前确定的喷射方向和磁盘倾斜度一致。流出质量为$ 9.5 \ times10^{ - 7} \ mathrm {m} _ {\ odot} $，流出速率为$ 4.3 \ times10^{ - 9} \ 9} \ Mathrm {m {m} _ {\ odot} _ {\ odot} \ mathrm} PAR-LUP3-4可能是二进制系统。我们已经详细介绍了Par-Lup3-4，其性能与其他非常低的质量来源中报道的属性一致。该来源提供了进一步的证据，表明非常低的质量来源是低质量恒星的缩放版本。
Very low-mass stars are known to have jets and outflows, which is indicative of a scaled-down version of low-mass star formation. However, only very few outflows in very low-mass sources are well characterized. We characterize the bipolar molecular outflow of the very low-mass star Par-Lup3-4, a 0.12 M$_{\odot}$ object known to power an optical jet. We observed Par-Lup3-4 with ALMA in Bands 6 and 7, detecting both the continuum and CO molecular gas. In particular, we studied three main emission lines: CO(2-1), CO(3-2), and $^{13}$CO(3-2). Our observations reveal for the first time the base of a bipolar molecular outflow in a very low-mass star, as well as a stream of material moving perpendicular to the primary outflow of this source. The primary outflow morphology is consistent with the previously determined jet orientation and disk inclination. The outflow mass is $9.5\times10^{-7}\mathrm{M}_{\odot}$ , with an outflow rate of $4.3\times10^{-9}\mathrm{M}_{\odot}\mathrm{yr}^{-1}$ A new fitting to the spectral energy distribution suggests that Par-Lup3-4 may be a binary system. We have characterized Par-Lup3-4 in detail, and its properties are consistent with those reported in other very low-mass sources. This source provides further evidence that very low-mass sources form as a scaled-down version of low-mass stars.
