arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1112.0359astro-ph.EP
收藏

银河系中热彗星的频率:来自SuperLupus巡天的结果

The Frequency of Hot Jupiters in the Galaxy: Results from the SuperLupus Survey

Daniel Bayliss, Penny Sackett

摘要:

我们提出的结果,超级狼疮调查过境热木星行星,监测一个单一的银河系磁盘领域跨越0.66平方米。三年内住了108晚。探测到了10颗候选行星:一颗是凌日行星,两颗仍然是候选行星,七颗后来被确定为误报。我们构造了一个新的图像质量度量,S_j,基于26,859光变曲线的行为,这使得我们能够以客观和定量的方式丢弃不良图像。此外,在某些情况下,我们能够通过分析S_j和过境签名之间的时间相关性来识别统计误报。我们使用蒙特卡罗模拟来衡量我们的检测效率注入人工过境到真正的光变曲线,并应用相同的选择标准,在我们的调查。我们发现在90%的置信水平下,0.10(+0.27/-0.08)%的矮星拥有一个热木星,周期为1-10天。我们的结果与其他凌日调查一致,但似乎始终低于径向速度调查报告的热木星频率,我们将这种差异至少部分归因于所探测的恒星星族的差异。根据我们对银河系场恒星中热彗星频率的测定,以前在疏散星团和球状星团巡天中凌日行星的零结果不再显得太低。

英文摘要:

We present the results of the SuperLupus Survey for transiting hot Jupiter planets, which monitored a single Galactic disk field spanning 0.66 sq. deg for 108 nights over three years. Ten candidates were detected: one is a transiting planet, two remain candidates, and seven have been subsequently identified as false positives. We construct a new image quality metric, S_j, based on the behaviour of 26,859 light curves, which allows us to discard poor images in an objective and quantitative manner. Furthermore, in some cases we are able to identify statistical false positives by analysing temporal correlations between S_j and transit signatures. We use Monte Carlo simulations to measure our detection efficiency by injecting artificial transits onto real light curves and applying identical selection criteria as used in our survey. We find at 90% confidence level that 0.10 (+0.27/-0.08)% of dwarf stars host a hot Jupiter with a period of 1-10 days. Our results are consistent with other transit surveys, but appear consistently lower than the hot Jupiter frequencies reported from radial velocity surveys, a difference we attribute, at least in part, to the difference in stellar populations probed. In light of our determination of the frequency of hot Jupiters in Galactic field stars, previous null results for transiting planets in open cluster and globular cluster surveys no longer appear anomalously low.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑