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首页> 外文期刊>Astronomy and astrophysics >Astrometric planet search around southern ultracool dwarfs - III. Discovery of a brown dwarf in a 3-year orbit around DE0630?18
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Astrometric planet search around southern ultracool dwarfs - III. Discovery of a brown dwarf in a 3-year orbit around DE0630?18

机译：南部超冷矮星周围的占星术行星搜寻-III。在DE0630周围的3年轨道中发现了一个棕色矮星？18

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摘要

Using astrometric measurements obtained with the FORS2/VLT camera, we are searching for low-mass companions around 20 nearby ultracool dwarfs. With a single-measurement precision of ~0.1 milli-arcsec, our survey is sensitive to a wide range of companion masses from planetary companions to binary systems. Here, we report the discovery and orbit characterisation of a new ultracool binary at a distance of 19.5 pc from Earth that is composed of the M8.5-dwarf primary DE0630?18 and a substellar companion. The nearly edge-on orbit is moderately eccentric (e = 0.23) with an orbital period of 1120 d, which corresponds to a relative separation in semimajor axis of approximately 1.1 AU. We obtained a high-resolution optical spectrum with UVES/VLT and measured the system’s heliocentric radial velocity. The spectrum does not exhibit lithium absorption at 670.8 nm, indicating that the system is not extremely young. A preliminary estimate of the binary’s physical parameters tells us that it is composed of a primary at the stellar-substellar limit and a massive brown-dwarf companion. DE0630?18 is a new very low-mass binary system with a well-characterised orbit.
机译：利用FORS2 / VLT摄像机获得的天文测量数据，我们正在寻找20个附近的超冷矮星附近的低质量伴星。我们的调查具有约0.1毫弧度的单次测量精度，对从行星伴星到二元系统的各种伴星质量都非常敏感。在这里，我们报告了距地球19.5 pc处的一个新的超冷双星的发现和轨道特征，该双星由M8.5矮的初级DE0630？18和一个星下伴星组成。接近边缘的轨道为中等偏心度（e = 0.23），轨道周期为1120 d，这对应于半长轴上的相对间距约为1.1 AU。我们使用UVES / VLT获得了高分辨率的光谱，并测量了系统的日心径向速度。该光谱在670.8 nm处未显示锂吸收，表明该系统不是非常年轻。对二进制文件物理参数的初步估计告诉我们，它由恒星-次星际极限的一个主星和一个巨大的棕矮伴星组成。 DE0630？18是一个新的超低质量二进制系统，具有很好的轨道。

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