Variable stars in the SuperWASP all sky survey

SuperWASP全天空光度测量（Pollacco et al. 2006）是对凌日系外行星最成功的地面搜索，已经发现了150多个热木星。在10年的运行中，它还产生了超过3000万高节奏光曲线的档案，其中包括5000多亿颗明亮恒星的单独测量结果。近年来，我们利用这些光度档案来解决恒星演化的各个方面，重点关注食双星和恒星多样性（Lohr等人，2012;2013a; 2013b; 2014a; 2014b; 2015a; 2015b）和恒星脉动（Norton等人，2016；Holdsworth等人，2014；Smalley等人，2011;2017）。这项工作的大部分灵感来自我们最初的工作，即识别与ROSAT x射线源一致的新周期变星（Norton et al. 2007）。最初的相互关联只是在SuperWASP的前几年数据上进行的，但对新的变量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存档的3000万颗恒星光曲线的周期性变化的新搜索。在从小时到年不等的时间尺度上，可以探测到多达一百万个物体的周期性变化。这个博士项目的最初目标是进行与Norton等人（2007）类似的分析，但与完整的SuperWASP档案和更大的x射线目录交叉相关，例如包含近30万个x射线点源的2xmi - dr3目录（Watson等人2009），因此在最终目录中产生一个数量级的增加。在这项工作的结果发表后，任命的博士候选人将进一步探索恒星变异性、多样性、脉动和旋转的各个方面，其中可能包括对恒星合并、食双星中的脉动恒星和其他罕见系统的搜索。D.L. et al . 2014年,引用:-霍尔兹沃思,MNRAS, 439年,2078年Lohr,当,诺顿A.J。科尔布,(,等。2012年,授权,542年,124年Lohr,当,诺顿A.J。科尔布,(,et al . 2013 a,授权,549年,86年Lohr,当,诺顿A.J。科尔布,(。),博伊德,2013 b,授权,558年,71年Lohr,当,何杰金氏病,年代,诺顿A.J。科尔布,(,2014 a,授权,563年,34 Lohr,当,诺顿A.J。科尔布,(,et al ., 2014 b,授权,566年,128年Lohr,当,诺顿A.J。科尔布,(,et al ., 2015 a,授权,578年,103年Lohr,当,诺顿A.J, et al ., 2015 b,6 norton， A.J, Lohr， M.E，等。2007,A&A, 467, 785Norton， A.J, Lohr， M.E，等。2016,A&A, 587, 54Pollacco， D.等，2006，PASP, 118,1407 -1418 Smalley， B.等。2011,A&A, 535, 3 Smalley， B.等。2017，MNRAS, 465, 2662 . watson， M.G.等。2009,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