论文标题
VMC J021140.41-735320.4- AB Doradus Young Moving Group的极红色L矮人候选人
VMC J021140.41-735320.4 -- an extremely red L dwarf candidate member of the AB Doradus young moving group
论文作者
论文摘要
我们报告了VMC J021140.41-735320.4的发现，微弱（$ j = 19.9 $ mag）和极红色（$ j-k_s = 3.0 $ mag，$ w1-w2 = 0.45 $ mag，$ j-w2 = 4.7 $ mag）在岩浆桥梁的前面的高应有的运动对象。在Schneider等人的调查中，它比最红色的L7矮人（$ j-k_s \ gtrsim 2.8 $ mag）在近红外的近红外甚至是红色。 （2017年）及其颜色也与其他奇特的红色L7.5矮人的颜色完全不匹配。因此，我们将其光度距离估计值约为73 PC是不确定的。 A preliminary combined proper motion and parallax solution involving 20 epochs from the Visible and Infrared Survey Telescope for Astronomy (VISTA) survey of the Magellanic Clouds (VMC), the VISTA hemisphere survey (VHS), and the Wide-field Infrared Survey Explorer (WISE) yields $μ_α\cosδ=+74.3\pm3.4$ mas/yr, $μ_δ=+22.3 \ pm3.4 $ mas/yr，$π= 21.0 \ pm7.1 $ mas。在这些结果中应用Banyan工具（http://www.exoplanetes.umontreal.ca/banyan/），我们在AB Doradus Young Moving Group（YMG）中找到了该对象的$ 68％会员可能的概率。 VMC J021140.41-735320.4的支架距离约为$ \ $ \ $ \，其绝对幅度相似，$ M_ {k_s} \ of13.4 $ mag与另一个AB Doradus YMG成员候选人的行星群众伴侣，2mass J22222222324552+47514.251425。建议进行后续分类光谱和星体监测。
We report the discovery of VMC J021140.41-735320.4, a faint ($J=19.9$ mag) and extremely red ($J-K_s=3.0$ mag, $W1-W2=0.45$ mag, $J-W2=4.7$ mag) high proper motion object in front of the Magellanic Bridge region. It is even redder in the near-infrared than the reddest L7 dwarfs ($J-K_s \gtrsim 2.8$ mag) found in the survey of Schneider et al. (2017) and its colours do also not match exactly those of other peculiar red L7.5 dwarfs. Therefore, we consider its photometric distance estimate of about 73 pc as uncertain. A preliminary combined proper motion and parallax solution involving 20 epochs from the Visible and Infrared Survey Telescope for Astronomy (VISTA) survey of the Magellanic Clouds (VMC), the VISTA hemisphere survey (VHS), and the Wide-field Infrared Survey Explorer (WISE) yields $μ_α\cosδ=+74.3\pm3.4$ mas/yr, $μ_δ=+22.3\pm3.4$ mas/yr, and $π=21.0\pm7.1$ mas. Applying the BANYAN tool (http://www.exoplanetes.umontreal.ca/banyan/) to these results we find a $\approx$68% membership probability of this object in the AB Doradus young moving group (YMG). With its trignometric distance of $\approx$48 pc, VMC J021140.41-735320.4 has a similar absolute magnitude of $M_{K_s}\approx13.4$ mag as the planetary mass companion of another AB Doradus YMG member candidate, 2MASS J22362452+4751425. Follow-up classification spectroscopy and astrometric monitoring are recommended.
