First T dwarfs in the VISTA Hemisphere Survey

First T dwarfs in the VISTA Hemisphere Survey
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VISTA 半球巡天中的第一颗 T 矮星

DOI:
10.1051/0004-6361/201220182
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发表时间:
2012
影响因子:
6.5
通讯作者:
Lodieu N
Lodieu N
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lodieu N

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该项目的目的是通过在整个南部天空中识别一个有限等的T矮星样本,提高我们目前对T矮星密度和恒星下初始质量函数形状的了解。方法:本文介绍了可见光和红外天文巡天望远镜(VISTA)和宽红外巡天探测器(WISE)卫星任务在红外波段拍摄的南方天空冷棕矮星的光度搜索结果。我们结合VISTA半球巡天(VHS)首次发布的数据(DR1)和WISE初步发布的数据,提取了具有红色中红外和近中红外特征的冷褐矮星候选者。结果VHS DR1和WISE搜索返回了数十个T矮星候选者,其中13个在本文中被介绍,其中包括2个先前发表的文献和5个新的光谱确认,光谱类型在T4.5和T8之间。我们估计这两颗T6矮星在16%的范围内,T4.5在25%的范围内。其余三个距离30-50个百分点。在我们的样本中,唯一的T7矮星是其光谱类别中最微弱的,j = 19.28等。其他6个候选T矮星仍然没有光谱跟踪。通过结合来自公共数据库(DENIS, 2MASS, VHS, WISE,Spitzer)的多历元数据,我们还提高了对三个明亮T矮星适当运动精度的认识。
AimsThe aim of the project is to improve our current knowledge of the density of T dwarfs and the shape of the substellar initial mass function by identifying a magnitude-limited sample of T dwarfs in the full southern sky.MethodsWe present the results of a photometric search aimed at discovering cool brown dwarfs in the southern sky imaged at infrared wavelengths by the Visible and Infrared Survey Telescope for Astronomy (VISTA) and the Wide Infrared Survey Explorer (WISE) satellite mission. We combined the first data release (DR1) of the VISTA Hemisphere Survey (VHS) and the WISE preliminary data release to extract candidates with red mid-infrared colours and near- to mid-infrared colours characteristics of cool brown dwarfs.ResultsThe VHS DR1 vs. WISE search returned tens of T dwarf candidates, 13 of which are presented here, including two previously published in the literature and five new ones confirmed spectroscopically with spectral types between T4.5 and T8. We estimate that the two T6 dwarfs lie within 16 pc and the T4.5 within 25 pc. The remaining three are 30–50 pc distant. The only T7 dwarf in our sample is the faintest of its spectral class withJ= 19.28 mag. The other six T dwarf candidates remain without spectroscopic follow-up. We also improve our knowledge on the proper motion accuracy for three bright T dwarfs by combining multi-epoch data from public databases (DENIS, 2MASS, VHS, WISE,Spitzer).
DOI: 10.1086/501431
发表时间: 2006-01
期刊: The Astronomical Journal
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DOI: --
发表时间: 2011
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作者:
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发表时间: 2012
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作者:
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DOI: 10.1086/498563
发表时间: 2005-10
期刊: The Astrophysical Journal
影响因子: --
作者:
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