Substellar Hyades Candidates from the UKIRT Hemisphere Survey
Substellar Hyades Candidates from the UKIRT Hemisphere Survey
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DOI：
10.3847/1538-3881/ac5f50
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发表时间：
2022-03
期刊：
影响因子：
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通讯作者：
A. Schneider;F. Vrba;J. Munn;S. Dahm;J. Bruursema;S. Williams;B. Dorland;J. Faherty;A. Rothermich;Emily Calamari;M. Cushing;D. Caselden;M. Kabatnik;William Pendrill;Arttu Sainio;Nikolaj Stevnbak Andersen;Christopher Tanner
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作者：
A. Schneider;F. Vrba;J. Munn;S. Dahm;J. Bruursema;S. Williams;B. Dorland;J. Faherty;A. Rothermich;Emily Calamari;M. Cushing;D. Caselden;M. Kabatnik;William Pendrill;Arttu Sainio;Nikolaj Stevnbak Andersen;Christopher Tanner
我们使用UKIRT半球巡天的数据来寻找毕宿星团的亚恒星成员。我们的搜索恢复了几个已知的亚恒星毕宿星团成员，和两个已知的褐矮星，我们建议可能是基于一个新的运动学分析的成员。我们发现了13个新的亚恒星毕宿星团候选者，并获得了每个IRTF/SpeX的近红外后续光谱。光谱类型在M7和L0之间的六个候选者被排除为潜在的成员，这是基于他们的光度距离（100 pc）。剩下的七个候选者，光谱类型在L5和T4之间，都是毕星团的潜在成员，其中五个基于BANYAN和收敛点分析显示出很强的成员概率。距离和径向速度仍然需要确认毕宿星成员。如果得到证实，这将是毕宿星团中已知的质量最低的自由漂浮成员，质量低至1030 M Jup。对所有已知的亚恒星毕宿星团候选者的分析表明，毕宿星团的全部范围尚未被探测到低质量成员，并且通过更深入的测光和天体测量调查可能会发现更多。
We have used data from the UKIRT Hemisphere Survey to search for substellar members of the Hyades cluster. Our search recovered several known substellar Hyades members, and two known brown dwarfs that we suggest may be members based on a new kinematic analysis. We uncovered thirteen new substellar Hyades candidates, and obtained near-infrared follow-up spectroscopy of each with IRTF/SpeX. Six candidates with spectral types between M7 and L0 are ruled out as potential members based on their photometric distances (≳100 pc). The remaining seven candidates, with spectral types between L5 and T4, are all potential Hyades members, with five showing strong membership probabilities based on BANYAN Σ and a convergent point analysis. Distances and radial velocities are still needed to confirm Hyades membership. If confirmed, these would be some of the lowest mass free-floating members of the Hyades yet known, with masses as low as ∼30 M Jup. An analysis of all known substellar Hyades candidates shows evidence that the full extent of the Hyades has yet to be probed for low-mass members, and more would likely be recovered with deeper photometric and astrometric investigations.