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DISCOVERY OF AN EDGE-ON DISK IN THE MBM 12 YOUNG ASSOCIATION

机译:MBM 12青年协会中边缘式磁盘的发现

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We report the discovery of a spatially resolved edge-on protoplanetary disk in the ~2 Myr old MBM 12 young association. Our near-infrared images of LkHα 263C (MBM 12A 3C), obtained with the Hokupa'a adaptive optics system on the Gemini North telescope, clearly show two elongated reflection nebulosities separated by a dark lane, a morphology well matched by scattered-light models of an optically thick (at near-infrared wavelengths) edge-on disk. An optical spectrum of the scattered-light nebulosity obtained with the Keck Ⅱ telescope exhibits a spectral type of M0 +- 0.5 (T_(eff) = 3850 +- 100 K) for the central star and contains Hα and forbidden emission lines, which may indicate the presence of a jet. The absence of a near-infrared point source implies A_K > 9.5 toward the unseen central star. The disk is flared and has a radius of ~150 AU (at a distance of 275 pc) and an inclination of 87°. The aspect ratio of the model disk in the J band is 0.72. There is possible evidence of dust settling to the disk midplane. LkHα 263C is 4.115″ from the 0.415″ binary LkHα 263 A and B (MBM 12A 3A and 3B), which is itself 15.5″ from LkHα 262 (MBM 12A 2). Thus, LkHα 263C may be the first disk to be clearly resolved around an individual star in a young quadruple system. The detection of a faint edge-on disk near a bright star demonstrates both the high angular resolution and the high sensitivity that can be achieved with adaptive optics imaging on large telescopes.
机译:我们报告了在〜2 Myr年老的MBM 12年轻协会中发现了空间分解的边缘在原行星盘上的发现。我们用双子北望远镜上的Hokupa'a自适应光学系统获得的LkHα263C(MBM 12A 3C)的近红外图像清楚地显示了两个拉长的反射星云,它们之间由暗线隔开,形态与散射光模型很好地匹配光学厚度(在近红外波长下)的边缘光盘。用KeckⅡ望远镜获得的散射光星云的光谱显示出中心星的光谱类型为M0 +-0.5(T_(eff)= 3850 +-100 K),并且包含Hα和禁止发射线,这可能表示喷射的存在。没有近红外点源意味着朝向看不见的中心恒星的A_K> 9.5。圆盘张开,半径约为150 AU(距离275 pc),倾角为87°。 J波段中模型盘的纵横比为0.72。可能有灰尘沉积在磁盘中板上的证据。 LkHα263C与0.415“二进制LkHα263 A和B(MBM 12A 3A和3B)相比为4.115”,后者本身与LkHα262(MBM 12A 2)相距15.5“。因此,LkHα263C可能是第一个在年轻四重系统中围绕单个恒星清晰分辨的盘。对一颗明亮恒星附近微弱的边缘盘的检测表明,使用大型望远镜上的自适应光学成像可以实现高角度分辨率和高灵敏度。

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