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We use the parallax measurements of RE J 0317-853 to determine its mass,radius, and cooling age and thereby constrain its evolutionary origins. Weobserved RE J 0317-853 with the the Hubble Space Telescope's Fine GuidanceSystem to measure the parallax of RE J 0317-853 and its binary companion, thenon-magnetic white dwarf LB 9802. In addition, we acquired spectra ofcomparison stars with the Boller & Chivens spectrograph of the SMARTS telescopeto correct the parallax zero point. For the corrected parallax, we determinethe radius, mass, and the cooling age with the help of evolutionary models fromthe literature. The properties of RE J 0317-853 are constrained using theparallax information. We discuss the different cases of the core compositionand the uncertain effective temperature. We confirm that RE J 0317-853 is closeto the Chandrasekhar's mass limit in all cases and almost as old as itscompanion LB 9802. The precise evolutionary history of RE J 0317-853 depends onour knowledge of its effective temperature. It is possible that it had a singlestar progenitor possible if we assume that the effective temperature is at thecooler end of the possible range from 30000 to 50000; if T_eff is instead atthe hotter end, a binary-merger scenario for RE J 0317-853 becomes moreplausible.

Constraints on the origin of the massive, hot, and rapidly rotating magnetic white dwarf RE J 0317-853 from an HST parallax measurement