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

Abstract

We report identification of the optical counterpart to the companion of the millisecond pulsar J2317+1439. At the timing position of the pulsar, we find an object with $g=22.96\pm 0.05$, $r=22.86\pm 0.04$ and $i=22.82\pm 0.05$. The magnitudes 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 $0.39_{-0.10}^{+0.13}$ M${}_{\odot }$, an effective temperature of $8077_{-470}^{+550}$ K and a cooling age of $10.9\pm 0.3$ Gyr. Combining our results with published constraints on the orbital parameters obtained through pulsar timing, we estimate the pulsar mass to be $3.4_{-1.1}^{+1.4}$ M${}_{\odot }$. Although the constraint on the pulsar mass is still weak, there is a significant possibility that the pulsar could be more massive than two solar mass.

arXiv comment7 pages, 6 figures, accepted for publication in ApJ

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