Efficient identification of exoplanetary transit candidates from SuperWASP light curves
A. Collier Cameron, D. M. Wilson, R. G. West, L. Hebb, X. -B. Wang, S. Aigrain, F. Bouchy, D. J. Christian, W. I. Clarkson, B. Enoch, M. Esposito, E. Guenther, … 展开作者
A. Collier Cameron, D. M. Wilson, R. G. West, L. Hebb, X. -B. Wang, S. Aigrain, F. Bouchy, D. J. Christian, W. I. Clarkson, B. Enoch, M. Esposito, E. Guenther, C. A. Haswell, G. Hebrard, C. Hellier, K. Horne, J. Irwin, S. R. Kane, B. Loeillet, T. A. Lister, P. Maxted, M. Mayor, C. Moutou, N. Parley, D. Pollacco, F. Pont, D. Queloz, R. Ryans, I. Skillen, R. A. Street, S. Udry, P. J. Wheatley
备注：
17 pages, 11 Figures, accepted for publication in MNRAS
凌日系外行星只占恒星系统范围的一小部分，这些恒星系统在使用小孔径相机阵列的宽视场调查中显示出周期性的浅暗。在这里，我们提出了一个有效的选择策略，后续观察，来自光变曲线的分析样本的67个SuperWASP目标，通过选择测试，我们在早期的论文中使用，但随后被确定为行星主机或天体物理误报。我们使用马尔可夫链蒙特卡罗分析的SuperWASP光变曲线确定系统参数。我们使用卡方约束优化结合贝叶斯先验的基础上，预计从2 MASS J-H颜色的主要序列的质量和半径。贝叶斯性质的分析，使我们能够量化离开主序星的质量半径关系和概率的伴侣半径小于1.5木星半径。当通过直接光变曲线分析来检测具有不相等的主日食和次日食的双星，以及具有由SuperWASP解决的孔径混合的物体时，我们发现原始67颗恒星中只有13颗，包括样本中的三颗已知行星，有资格进行后续研究。这表明，行星发现的“命中率”应该可以达到五分之一以上。此外，符合条件的恒星双星可能具有天体物理学上有趣的恒星或亚恒星双星。
英文摘要：
Transiting extrasolar planets constitute only a small fraction of the range of stellar systems found to display periodic, shallow dimmings in wide-field surveys employing small-aperture camera arrays. Here we present an efficient selection strategy for follow-up observations, derived from analysis of the light curves of a sample of 67 SuperWASP targets that passed the selection tests we used in earlier papers, but which have subsequently been identified either as planet hosts or as astrophysical false positives. We determine the system parameters using Markov-chain Monte Carlo analysis of the SuperWASP light curves. We use a constrained optimisation of chi-squared combined with a Bayesian prior based on the main-sequence mass and radius expected from the 2MASS J-H colour. The Bayesian nature of the analysis allows us to quantify both the departure of the host star from the main-sequence mass-radius relation and the probability that the companion radius is less than 1.5 Jupiter radii. When augmented by direct light curve analyses that detect binaries with unequal primary and secondary eclipses, and objects with aperture blends that are resolved by SuperWASP, we find that only 13 of the original 67 stars, including the three known planets in the sample, would qualify for follow-up. This suggests that planet discovery "hit rates" better than one-in-five should be achievable. In addition, the stellar binaries that qualify are likely to have astrophysically interesting stellar or sub-stellar secondaries.
SuperWASP-N Extra-solar Planet Candidates from Fields 06hr < RA < 16hr
广角行星搜索（WASP）调查目前运行两个装置，分别位于北半球和南半球，命名为SuperWASP-N和SuperWASP-S。这些装置旨在提供高时间分辨率的测光，以探测凌日的太阳系外行星、小行星和瞬变事件。在这里，我们介绍了使用SuperWASP-N进行的凌日搜寻观测活动的结果，覆盖了06小时< RA <16小时的赤经范围。本文是2004年观测季节发布的一系列过境候选者中的第五篇，也是最后一篇。总共监测了来自33个视场的729，335颗恒星，其中130，566颗具有足够的精度来扫描凌日特征。使用强大的凌日侦测算法和选择标准，发现6颗恒星的事件与基于测光的凌日太阳系外行星的特征一致，包括已知的凌日行星XO-1b。这些过境候选人在这里提出的讨论，以及后续的观察和预期的候选人数量的整体观测战略。
