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A Massive Pulsar in a Compact Relativistic Binary

There were three observational datasets used for this paper: VLT+FORS2 optical spectroscopy, WHT+ULTRACAM u'g'r' optical light curves, and 1.4 GHz Arecibo+Effelsberg radio timing. Dhillon led the WHT+ULTRACAM component. Dhillon was responsible for the design, construction and operation of ULTRACAM. Dhillon wrote the successful telescope proposal to observe the pulsar with ULTRACAM, obtained and reduced the data, analysed it, and assisted with its interpretation in conjunction with the optical spectroscopy and radio timing data. The ULTRACAM light curves provided a vital check on the system parameters derived from the optical spectroscopy and radio timing.