Output details

Two planets orbiting the recently formed post-common envelope binary NN Serpentis

This paper uses 52 eclipse timings of NN Ser to discover the first planets orbiting a close binary star. Approximately half of these eclipses were observed with ULTRACAM on the VLT, WHT and NTT. The ULTRACAM eclipse timings are by far the most accurate, and hence are the most important dataset in the paper. Some of the ULTRACAM timings of NN Ser were initially found to be discrepant, a problem subsequently solved by Dhillon by analysing the timing accuracy using a custom-made GPS-driven LED source. As well as this timing analysis, Dhillon was also responsible for the design and construction of ULTRACAM, and commissioning it on the WHT, VLT and NTT. Dhillon was also responsible for performing the actual observations of a large number of the ULTRACAM eclipses of NN Ser.