...
首页> 外文期刊>The Astrophysical journal >RESOLVED SPECTROSCOPY OF M DWARF/L DWARF BINARIES. IV. DISCOVERY OF AN M9 + L6 BINARY SEPARATED BY OVER 100?AU
【24h】

RESOLVED SPECTROSCOPY OF M DWARF/L DWARF BINARIES. IV. DISCOVERY OF AN M9 + L6 BINARY SEPARATED BY OVER 100?AU

机译:M DWARF / L DWARF双线性的分辨光谱。 IV。发现超过100?AU的M9 + L6二元

获取原文

摘要

We report the discovery of a faint L6?± 1 companion to the previously known M9 dwarf, 2MASS J01303563–4445411, based on our near-infrared imaging and spectroscopic observations with the 3 m Infrared Telescope Facility SpeX imager/spectrometer. The visual binary is separated by 328?± 005 on the sky at a spectrophotometric distance of 40?± 14?pc. The projected physical separation is 130?± 50?AU, making it one of the widest very low mass (VLM) field multiples containing a brown dwarf companion. 2MASS J0130–4445 is only one of ten wide VLM pairs and only one of six in the field. The secondary is considerably fainter (ΔK≈ 2.35?mag) and redder (Δ (J – Ks ) ≈ 0.81 dex), consistent with component near-infrared types of M9.0?± 0.5 and L6?± 1 based on our resolved spectroscopy. The component types suggest a secondary mass well below the hydrogen-burning limit and an age-dependent mass ratio of 0.6-0.9. The system's space motion and spectroscopic indicators suggest an age of 2-4?Gyr while the model-dependent masses and binding energies suggest that this system is unlikely to have formed via dynamical ejection. The age, composition, and separation of the 2MASS J01303563–4445411 system make it useful for tests of VLM formation theories and of condensate cloud formation in L dwarfs.
机译:我们用3 m红外望远镜设备SpeX成像仪/光谱仪对我们的近红外成像和光谱观测结果进行了报道,发现与先前已知的M9矮星2MASS J01303563–4445411伴有微弱的L6?±1伴星。可见的二进制文件在天空上以328?±005的距离被分光光度计距离40?±14?pc隔开。预计的物理间隔为130?±50?AU,使其成为包含棕色矮伴星的最宽极低质量(VLM)场倍数之一。 2MASS J0130–4445仅是十对宽VLM对中的一对,而在现场仅为六对之一。次级光束相当暗(ΔK≈2.35?mag)和偏红(Δ(J – Ks)≈0.81 dex),与我们解析光谱得出的组件近红外类型M9.0?±0.5和L6?±1一致。 。组分类型表明二次质量远低于氢燃烧极限,且随年龄变化的质量比为0.6-0.9。该系统的空间运动和光谱指示符表明年龄为2-4?Gyr,而与模型有关的质量和结合能表明该系统不太可能通过动力喷射形成。 2MASS J01303563–4445411系统的年龄,组成和分离程度,对测试VLM形成理论和L矮星中的凝析云形成非常有用。

著录项

获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号