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DISCOVERY OF TWO VERY WIDE BINARIES WITH ULTRACOOL COMPANIONS AND A NEW BROWN DWARF AT THE L/T TRANSITION

机译:在L / T过渡时发现两个非常宽泛的二元体,并带有ULTRACOOL化合物和一个新的棕色矮人

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摘要

We present the discovery and spectroscopic follow-up of a nearby late-type L dwarf (2M0614+3950), and two extremely wide very low mass binary systems (2M0525-7425AB and 2M1348-1344AB), resulting from our search for common proper motion pairs containing ultracool components in the Two Micron All Sky Survey and the Wide-field Infrared Survey Explorer catalogs. The near-infrared spectrum of 2M0614+3950 indicates a spectral type L9 ± 1 object residing at a distance of 26.0 ± 1.8 pc. The optical spectrum of 2M0525-7425A reveals an M3.0 ± 0.5 dwarf primary, accompanied by a secondary previously classified as L2. The system has an angular separation of ~44'', equivalent to ~2000?AU at a distance of 46.0 ± 3.0 pc. Using optical and infrared spectra, respectively, we classify the components of 2M1348-1344AB as M4.5 ± 0.5 and T5.5 ± 1. The angular separation of ~68'' is equivalent to ~1400?AU at a distance of 20.7 ± 1.4 pc. 2M1348-1344AB is one of only six very wide (separation 1000 AU) systems containing late T dwarfs known to date.
机译:我们寻找附近的晚期L型矮星(2M0614 + 3950)和两个极宽的超低质量二元系统(2M0525-7425AB和2M1348-1344AB),并通过发现进行光谱跟踪,这是由于我们寻找共同的适当运动而产生的在“两微米全天候测量”和“宽视场红外测量浏览器”目录中包含超冷成分的对。 2M0614 + 3950的近红外光谱表示光谱类型为L9±1物体,其距离为26.0±1.8 pc。 2M0525-7425A的光谱显示出M3.0±0.5矮的初级,并伴有先前归类为L2的次级。该系统的角距为〜44英寸,在46.0±3.0 pc的距离上相当于〜2000?AU。分别使用光谱和红外光谱,我们将2M1348-1344AB的成分分为M4.5±0.5和T5.5±1。〜68''的角间距等于〜20.0±AU,在20.7±的距离上1.4个2M1348-1344AB是仅有的六个非常宽的系统(分离度> 1000 AU)之一,其中包含迄今为止已知的晚期T矮星。
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