Probing the Upper Scorpius mass function in the planetary-mass regime?
Probing the Upper Scorpius mass function in the planetary-mass regime?
复制标题
探索行星质量体系中的上天蝎座质量函数？
DOI：
10.1093/mnras/stt1460
复制
发表时间：
2013
影响因子：
4.8
通讯作者：
Lodieu N
中科院分区：
文献类型：
--
作者：
Lodieu N
我们提出了一个深ZYJ近红外调查的结果，13.5 deg 2在上天蝎座（USco）OB协会。根据最先进的进化模型，我们用光度法选择了1000个质量在30-5千分之一的集群成员候选者。我们确定67 ZYJ候选人作为真正的成员，基于补充测光和天体测量。我们还提取了五个候选人发现的可见光和红外天文巡天望远镜在YJonly。一个被排除使用深光学波段成像，而两个可能是非成员，三个仍然是潜在的成员。我们的结论是，USCO的质量函数更有可能在行星质量制度减少（虽然一个单位的质量函数还不能被丢弃），在其他地区的调查一致。
We present the results of a deepZYJnear-infrared survey of 13.5 deg2in the Upper Scorpius (USco) OB association. We photometrically selected ∼100 cluster member candidates with masses in the range of 30–5 Jupiters, according to state-of-the-art evolutionary models. We identified 67ZYJcandidates as bona fide members, based on complementary photometry and astrometry. We also extracted five candidates detected with Visible and Infrared Survey Telescope for Astronomy atYJonly. One is excluded using deep opticalz-band imaging, while two are likely non-members, and three remain as potential members. We conclude that the USco mass function is more likely decreasing in the planetary-mass regime (although a flat mass function cannot yet be discarded), consistent with surveys in other regions.