The Death Spiral of T Pyxidis

Joseph Patterson, Arto Oksanen, Berto Monard, Robert Rea, Franz-Josef Hambsch, Jennie McCormick, Peter Nelson, Jonathan Kemp, William Allen, Thomas Krajci, Simon Lowther, Shawn Dvorak, Thomas Richards, Gordon Myers & Greg Bolt
We report a long campaign to track the 1.8 hr photometric wave in the recurrent nova T Pyxidis, using the global telescope network of the Center for Backyard Astrophysics. During 1996-2011, that wave was highly stable in amplitude and waveform, resembling the orbital wave commonly seen in supersoft binaries. The period, however, was found to increase on a timescale P/P-dot=3x10^5 yr. This suggests a mass transfer rate of ~10^-7 M_sol/yr in quiescence. The orbital signal...
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