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arXiv 0705.3727astro-ph
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在UKIDSS大面积调查数据发布1中发现了八个新的PDKEEPAAA.5-T7.5矮星

Eight new T4.5-T7.5 dwarfs discovered in the UKIDSS Large Area Survey Data Release 1

N. Lodieu, D. J. Pinfield, S. K. Leggett, R. F. Jameson, D. J. Mortlock, S. J. Warren, 31 co-authors

摘要:

我们提出了8个新的T4.5-T7.5矮星在UKIRT红外深空巡天(UKIDSS)大面积巡天(LAS)数据发布1(DR 1)中确定。此外,我们还发现了T4.5矮星SDSS J020742.91+000056.2和T8.5矮星ULAS J003402.77-005206.7。光度候选人拿起超过190平方度(DR 1)的双色图,并选择在至少两个过滤器。所有候选者都表现出具有T矮星特征的强甲烷和水吸收带的近红外光谱,并且导出的光谱类型遵循Burgasser等人(2006)的统一方案。我们发现了6个新的T4.5-T5.5矮星,一个T7矮星,一个T7.5矮星,并恢复了一个T4.5矮星和一个T8.5矮星。我们提供的距离估计位于15-85 pc的范围内; T7.5和T8.5矮星可能在25 pc的太阳。最后,我们的讨论完成后的LAS预计T矮星的数量,比较这些初步结果的理论模拟。

英文摘要:

We present eight new T4.5-T7.5 dwarfs identified in the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) Data Release 1 (DR1). In addition we have recovered the T4.5 dwarf SDSS J020742.91+000056.2 and the T8.5 dwarf ULAS J003402.77-005206.7. Photometric candidates were picked up in two-colour diagrams over 190 square degrees (DR1) and selected in at least two filters. All candidates exhibit near-infrared spectra with strong methane and water absorption bands characteristic of T dwarfs and the derived spectral types follow the unified scheme of Burgasser et al. (2006). We have found 6 new T4.5-T5.5 dwarfs, one T7 dwarf, one T7.5 dwarf, and recovered a T4.5 dwarf and a T8.5 dwarf. We provide distance estimates which lie in the 15-85 pc range; the T7.5 and T8.5 dwarfs are probably within 25 pc of the Sun. We conclude with a discussion of the number of T dwarfs expected after completion of the LAS, comparing these initial results to theoretical simulations.

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