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We report identification of the optical counterpart to the companion of themillisecond pulsar J2317+1439. At the timing position of the pulsar, we find anobject with $g=22.96\pm0.05$, $r=22.86\pm0.04$ and $i=22.82\pm0.05$. Themagnitudes and colors of the object are consistent with it being a white dwarf.By comparing with white dwarf cooling models, we estimate that it has a mass of$0.39^{+0.13}_{-0.10}$ M$_{\odot}$, an effective temperature of$8077^{+550}_{-470}$ K and a cooling age of $10.9\pm0.3$ Gyr. Combining ourresults with published constraints on the orbital parameters obtained throughpulsar timing, we estimate the pulsar mass to be $3.4^{+1.4}_{-1.1}$M$_{\odot}$. Although the constraint on the pulsar mass is still weak, there isa significant possibility that the pulsar could be more massive than two solarmass.

Identification of the white dwarf companion to millisecond pulsar J2317+1439