Variable stars in the SuperWASP all sky survey

SuperWASP全天光度测量(波拉科等人2006)是对凌日系外行星进行的最成功的地面搜索，发现了150多颗热木星。在10年的运行中，它还产生了3000多万条高节奏光曲线的档案，其中包括超过5000亿颗明亮恒星的单独测量。近年来，我们利用这一光度学档案来研究恒星演化的各个方面，重点放在遮挡双星和恒星多样性上(Lohr等人。2012年；2013a；2013b；2014a；2014b；2015a；2015b)和恒星脉动(Norton等人)。2016年；Holdsworth等人。2014年；斯马利等人。2011年；2017年)。这项工作的大部分灵感来自于我们最初关于识别与ROSAT X射线源一致的新的周期变星的工作(Norton等人。2007)。最初的交叉关联仅在SuperWASP数据的最初几年执行，但为新的可变对象产生了数百个匹配。在我们的Linux集群上运行了50年的CPU之后，我们即将完成对整个SuperWASP存档中3000万条恒星光曲线的周期变化的新搜索。多达一百万个物体在几小时到几年的时间尺度上可以检测到周期性地变化。这个博士项目的最初目标将是进行类似于Norton等人的分析。(2007年)，但与SuperWASP的完整档案和更大的X射线星表，如包含近300,000个X射线点源的2XMMi-DR3星表(Watson等人，2009年)进行了交叉关联，从而导致所产生的星表增加了数量级。在这项工作的结果公布后，被任命的博士候选人将探索恒星的可变性、多重性、脉动和自转的更多方面，其中可能包括搜索恒星合并、食双星中的脉动恒星和其他罕见系统。2014，MNRAS，439,2078Lohr，M.E.，Norton，A.J.，Kolb，U.C.等。2012年，A&A，542,124 Lohr，M.E.，Norton，A.J.，Kolb，U.C.等。2013a，A&A，549，86 Lohr，M.E.，Norton，A.J.，Kolb，U.C.，Boyd，D.，2013b，A&A，558，71 Lohr，M.E.，Hodgkin，S.，Norton，A.J.，Kolb，U.C.，2014a，A&A，563，34 Lohr，M.E.，Norton，A.J.，Kolb，U.C.等，2014b，A&A，566,128 Lohr，M.E.，Norton，A.J.，Kolb，U.C.，等等，2015A，A&A，578,103 Lohr，M.E.，Norton，A.J.等，2015b，A&A，578,136Norton，A.J.等。2007年，A&A，467,785 Norton，A.J.，Lohr，M.E.等，2016，A&A，587，54Pollko，D.等，2006，PASP，118,1407-1418 Smolley，B.等人。2011年，A&A，3斯莫利，B.等人。2017，MNRAS，465,2662 Watson，M.G.等人。2009年，A&A，493,339

The SuperWASP all sky photometric survey (Pollacco et al. 2006) is the most successful ground based search for transiting exoplanets, having discovered more than 150 hot Jupiters. In 10 years of operation, it has also produced an archive of more than 30 million high cadence lightcurves comprising over 500 billion individual measurements of bright stars. In recent years we have exploited this photometric archive to address aspects of stellar evolution, focussing on eclipsing binaries and stellar multiplicity (Lohr et al. 2012; 2013a; 2013b; 2014a; 2014b; 2015a; 2015b) and on stellar pulsations (Norton et al. 2016; Holdsworth et al. 2014; Smalley et al. 2011; 2017). Much of this work was inspired by our initial work on identifying new periodic variable stars coincident with ROSAT X-ray sources (Norton et al. 2007). That initial cross-correlation was performed on only the first few years of SuperWASP data but yielded hundreds of matches for new variable objects.Following a 50 CPU-year run on our linux cluster, we are nearing completion of a new search for periodic variability in the entire SuperWASP archive of 30 million stellar lightcurves. Up to a million objects are detectably periodically variable on timescales from hours to years. An initial aim of this PhD project will be to carry out a similar analysis to that of Norton et al. (2007) but cross-correlating against the full SuperWASP archive and a much larger X-ray catalogue, such as the 2XMMi-DR3 catalogue of almost 300,000 X-ray point sources (Watson et al 2009), so yielding an order of magnitude increase in the resulting catalogue. Following publication of the results from this work, the PhD candidate appointed will explore further aspects of stellar variability, multiplicity, pulsation, and rotation, which may include searches for stellar mergers, pulsating stars in eclipsing binaries, and other rare systems.References:Holdsworth, D.L. et al. 2014, MNRAS, 439, 2078Lohr, M.E., Norton, A.J., Kolb, U.C., et al. 2012, A&A, 542, 124 Lohr, M.E., Norton, A.J., Kolb, U.C., et al. 2013a, A&A, 549, 86 Lohr, M.E., Norton, A.J., Kolb, U.C., Boyd, D., 2013b, A&A, 558, 71Lohr, M.E., Hodgkin, S., Norton, A.J., Kolb, U.C., 2014a, A&A, 563, 34 Lohr, M.E., Norton, A.J., Kolb, U.C., et al., 2014b, A&A, 566, 128Lohr, M.E., Norton, A.J., Kolb, U.C., et al., 2015a, A&A, 578, 103 Lohr, M.E., Norton, A.J., et al., 2015b, A&A, 578, 136Norton, A.J., et al. 2007, A&A, 467, 785Norton, A.J., Lohr, M.E., et al., 2016, A&A, 587, 54Pollacco, D. et al., 2006, PASP, 118, 1407-1418 Smalley, B., et al. 2011, A&A, 535, 3 Smalley, B., et al. 2017, MNRAS, 465, 2662Watson, M.G., et al. 2009, A&A, 493, 339