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We present pre-explosion and post-explosion Hubble Space Telescope images ofthe Type Iax supernova (SN Iax) 2014dt in M61. After astrometrically aligningthese images, we do not detect any stellar sources at the position of the SN inthe pre-explosion images to relatively deep limits (3 sigma limits of M_F438W >-5.0 mag and M_F814W > -5.9 mag). These limits are similar to the luminosity ofSN 2012Z's progenitor system (M_F435W = -5.43 +/- 0.15 and M_F814W = -5.24 +/-0.16 mag), the only probable detected progenitor system in pre-explosion imagesof a SN Iax, and indeed, of any white dwarf supernova. SN 2014dt is consistentwith having a C/O white-dwarf primary/helium-star companion progenitor system,as was suggested for SN 2012Z, although perhaps with a slightly smaller orhotter donor. The data are also consistent with SN 2014dt having a low-mass redgiant or main-sequence star companion. The data rule out main-sequence starswith M_init > 16 M_sun and most evolved stars with M_init > 8 M_sun as beingthe progenitor of SN 2014dt. Hot Wolf-Rayet stars are also allowed, but thelack of nearby bright sources makes this scenario unlikely. Because of itsproximity (D = 12 Mpc), SN 2014dt is ideal for long-term monitoring, whereimages in ~2 years may detect the companion star or the luminous bound remnantof the progenitor white dwarf.

On the Progenitor System of the Type Iax Supernova 2014dt in M61