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In 2011, Bailes et al. reported on the discovery of a detached companion in a131 minute orbit around PSR J1719-1438, a 173 Hz millisecond pulsar. Thecombination of the very low mass function and such a short orbital period isunique. The discoverers suggested that the progenitor system could be anultracompact X-ray binary (UCXB), which is a binary with a sub-hour orbitalperiod in which a (semi-)degenerate donor fills its Roche lobe and transfersmass to a neutron star. The standard gravitational-wave driven UCXB scenario,however, cannot produce a system like PSR J1719-1438 as it would take longerthan the age of the Universe to reach an orbital period of 131 min. Weinvestigate two modifications to the standard UCXB evolution that may resolvethis discrepancy. The first involves significant heating and bloating of thedonor by pulsar irradiation, and in the second modification the system losesorbital angular momentum via a fast stellar wind from the irradiated donor,additional to the losses via the usual gravitational wave radiation. Inparticular a donor wind is effective in accelerating orbital expansion, andeven a mild wind could produce the 131 minute period within the age of theUniverse. We note that UCXBs could be an important class of progenitors ofsolitary millisecond radio pulsars.

Formation of the planet orbiting the millisecond pulsar J1719-1438