论文标题

调查2M1155-7919B:附近的年轻,低质量恒星从近乎边缘的,尘土飞扬的磁盘积极积聚

Investigating 2M1155-7919B: a Nearby, Young, Low-Mass Star Actively Accreting from a Nearly Edge-on, Dusty Disk

论文作者

Dickson-Vandervelde, D. Annie, Kastner, Joel H., Gagné, Jonathan, Schneider, Adam C., Faherty, Jacqueline, Wilson, Emily C., Pinte, Christophe, Ménard, Francois

论文摘要

我们调查了$ε$ CHA协会($ d \ sim100 $ pc,$ \ sim5 $ myr)的异常微弱成员的性质,这是$ <$ 8 $ 8 MYR的最接近星形形成区域。该对象是2MASS J1155036-7919147(2M1155 $ - $ 79B),是一个宽($ \ sim $ 580 au)的宽度($ 580 au),与低质量(M3)$ε$ CHA协会成员2mass J11550485-7919108(2M3)(2M3)合作(M3)$ε$ CHA协会(2mass)。我们呈现两个组件的近红外光谱,以及对Gaia EDR3、2Mass,VHS和Wise的光度法的分析。 2M1155 $ - $ 79B的近红外光谱显示出强大的HE I 1.083排放,这是来自Internellar磁盘的主动积聚和/或增生驱动的风的标志。明智的档案数据分析表明,以前与2M1155 $ - $ 79A相关的中红外超额量来自2M1155 $ - $ 79B的磁盘。基于这些结果以及其光学光谱分布的辐射转移模型,我们得出结论,2M1155 $ - $ 79B很可能是一颗年轻的,后期的M,恒星,部分被近乎边缘的旋转磁盘所部分掩盖并积极地积聚。这将使2M1155 $ - $ 79B在附近罕见的群体($ d \ Lessim100 $ PC)中,年轻($ <$ <$ <$ 10 MYR)中型恒星,这些Mid-M Stars是由高度倾斜的Protoplanetary磁盘绕并积聚的。像这些系统一样,2M1155 $ - $ 79B系统对于在低质量恒星周围的恒星和行星形成的研究是一个特别有希望的主题。

We investigate the nature of an unusually faint member of the $ε$ Cha Association ($D\sim100$ pc, age $\sim5$ Myr), the nearest region of star formation of age $<$8 Myr. This object, 2MASS J11550336-7919147 (2M1155$-$79B), is a wide ($\sim$580 AU) separation, comoving companion to low-mass (M3) $ε$ Cha Association member 2MASS J11550485-7919108 (2M1155$-$79A). We present near-infrared spectra of both components, along with analysis of photometry from Gaia EDR3, 2MASS, VHS, and WISE. The near-IR spectrum of 2M1155$-$79B displays strong He I 1.083 emission, a sign of active accretion and/or accretion-driven winds from a circumstellar disk. Analysis of WISE archival data reveals that the mid-infrared excess previously associated with 2M1155$-$79A instead originates from the disk surrounding 2M1155$-$79B. Based on these results, as well as radiative transfer modeling of its optical/IR spectral energy distribution, we conclude that 2M1155$-$79B is most likely a young, late-M, star that is partially obscured by, and actively accreting from, a nearly edge-on circumstellar disk. This would place 2M1155$-$79B among the rare group of nearby ($D\lesssim100$ pc), young (age $<$10 Myr) mid-M stars that are orbited by and accreting from highly inclined protoplanetary disks. Like these systems, the 2M1155$-$79B system is a particularly promising subject for studies of star and planet formation around low-mass stars.

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