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Observations of stellar remnants linked to Type Ia and Type Iax supernovaeare necessary to fully understand their progenitors. Multiple progenitorscenarios predict a population of kicked donor remnants and partially-burntprimary remnants, both moving with relatively high velocity. But only a handfulof examples consistent with these two predicted populations have been observed.Here we report the likely first known example of an unbound white dwarf that isconsistent with being the fully-cooled primary remnant to a Type Iax supernova.The candidate, LP 93-21, is travelling with a galactocentric velocity ofv$_{gal}$ $\simeq$ 605 km s$^{-1}$, and is gravitationally unbound to the MilkyWay. We rule out an extragalactic origin. The Type Iax supernova ejectionscenario is consistent with its peculiar unbound trajectory, given anomalouselemental abundances are detected in its photosphere via spectroscopicfollow-up. This discovery reflects recent models that suggest stellar ejectionslikely occur often. Unfortunately the intrinsic faintness of white dwarfs, andthe uncertainty associated with their direct progenitor systems, makes itdifficult to detect and confirm such donors.

A hyper-runaway white dwarf in Gaia DR2 as a Type Iax supernova primary remnant candidate