NEW CANDIDATES FOR PLANETARY-MASS BROWN DWARFS IN IC 348.

IF 5.1 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Astronomical Journal Pub Date : 2020-08-01 Epub Date: 2020-07-09 DOI:10.3847/1538-3881/ab96bb

K L Luhman, C J Hapich

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引用次数: 0

Abstract

We have used infrared images obtained with the Wide Field Camera 3 on board the Hubble Space Telescope to search for planetary-mass brown dwarfs in the star-forming cluster IC 348. In those images, we have identified 12 objects that have colors indicative of spectral types later than M8, corresponding to masses of ≲ 30 M _Jup at the age of IC 348. The four brightest candidates have been observed with spectroscopy, all of which are confirmed to have late types. Two of those candidates appear to be young, and thus are likely members of the cluster, while the ages and membership of the other two candidates are uncertain. One of the former candidates is the faintest known member of IC 348 in extinction-corrected K _s and is expected to have a mass of 4-5 M _Jup based on evolutionary models and an assumed age of 3 Myr. Four of the remaining eight candidates have ground-based photometry that further supports their candidacy as brown dwarfs, some of which are fainter (and potentially less massive) than the known members.

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新的候选行星质量褐矮星ICE 348.

我们利用哈勃太空望远镜（Hubble Space Telescope）上的宽视场照相机3（Wide Field Camera 3）获得的红外图像，在恒星形成星团IC 348中寻找行星质量的褐矮星。在这些图像中，我们发现了 12 个天体，它们的颜色表明其光谱类型晚于 M8，对应于 IC 348 年龄时的≲ 30 M Jup 质量。我们用光谱仪观测到了四个最亮的候选天体，它们都被证实具有晚期类型。其中两个候选者看起来很年轻，因此很可能是星团的成员，而另外两个候选者的年龄和成员身份还不确定。其中一个候选者是IC 348中消光校正K s值最暗的已知成员，根据演化模型和3 Myr的假定年龄，其质量预计为4-5 M Jup。其余 8 个候选者中有 4 个的地基测光结果进一步支持了它们作为褐矮星的候选资格，其中一些比已知成员更暗（质量也可能更小）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Astronomical Journal 地学天文-天文与天体物理

CiteScore

8.40

自引率

24.50%

发文量

501

审稿时长

2-4 weeks

期刊介绍： The Astronomical Journal publishes original astronomical research, with an emphasis on significant scientific results derived from observations. Publications in AJ include descriptions of data capture, surveys, analysis techniques, astronomical interpretation, instrumentation, and software and computing.