SuperWASP-North extrasolar planet candidates between 3 < RA

DOI：

10.1111/j.1365-2966.2007.12294.x

发表时间：

2007-08

期刊：

Scopus

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其他

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作者：

W. Clarkson;B. Enoch;C. Haswell;A. Norton;D. Christian;A. Cameron;S. Kane;K. Horne;T. Lister;R. Street;R. West;D. Wilson;N. Evans;A. Fitzsimmons;C. Hellier;S. T.Hodgkin;J. Irwin;F. Keenan;J. Osborne;N. Parley;D. Pollacco;R. Ryans;I.Skillen;P. Wheatley

广角行星搜索（WASP）通过光度测量方法调查了大量附近的恒星，以发现太阳系外行星系统的候选者，这些候选者依靠的是小于或类似于“热彗星”典型的5维时间尺度上的小振幅光变曲线下降。2004年4月至9月期间，SuperWASP-North仪器的观测产生了一个丰富的光度数据集，其中包括来自670万颗恒星的约1.3x10（9）个数据点。我们定制的数据采集和处理系统在V = 13时产生类似于0.02 mag的光度精度。我们提出了03（h）-06（h）RA范围内的凌日候选者。在141895条光变曲线中，有2688条光变曲线显示出统计上显著的过境周期。其中，44个通过了光变曲线的目视检查，其中24个通过对伪影统计显著性的一组切割而被去除。在考虑到现有星表中较高空间分辨率的先验信息后，其余20个天体中除4个外均被删除。在剩下的四个候选目标中，一个被认为是后续观察的良好候选目标，另外还有三个第二优先目标。我们提供了这些候选人的详细信息，以及被淘汰的假阳性和天体物理假警报的选择，并简要讨论了采样对我们的结果的影响。

The Wide Angle Search for Planets (WASP) photometrically surveys a large number of nearby stars to uncover candidate extrasolar planet systems by virtue of small-amplitude light curve dips on a less than or similar to 5-d time-scale typical of the 'Hot-Jupiters'. Observations with the SuperWASP-North instrument between 2004 April and September produced a rich photometric data set of some 1.3 x 10(9) data points from 6.7 million stars. Our custom-built data acquisition and processing system produces similar to 0.02 mag photometric precision at V = 13. We present the transit candidates in the 03(h)-06(h) RA range. Out of 141 895 light curves with sufficient sampling to provide adequate coverage, 2688 show statistically significant transit-like periodicities. Out of these, 44 pass a visual inspection of the light curve, of which 24 are removed through a set of cuts on the statistical significance of artefacts. All but four of the remaining 20 objects are removed when prior information at higher spatial resolution from existing catalogues is taken into account. Of the four candidates remaining, one is considered a good candidate for follow-up observations with three further second-priority targets. We provide detailed information on these candidates, as well as a selection of the false-positives and astrophysical false-alarms that were eliminated, and discuss briefly the impact of sampling on our results.

SuperWASP-North extrasolar planet candidates between 3 < RA < 6

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