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We present X-ray and radio observations of what may be the closest type Iaxsupernova (SN) to date, SN 2014dt (d=12.3-19.3 Mpc) and provide tightconstraints on the radio and X-ray emission. We infer a specific radioluminosity of < (1.0-2.4)E25 erg/s/Hz at a frequency of 7.5 GHz and a X-rayluminosity < 1.4E38 erg/s (0.3-10 keV) at ~38-48 days post-explosion. Weinterpret these limits in the context of Inverse Compton (IC) emission andsynchrotron emission from a population of electrons accelerated at the forwardshock of the explosion in a power-law distribution $N_e(\gamma_e)\propto\gamma_e^{-p}$ with p=3. Our analysis constrains the progenitor systemmass-loss rate to be smaller than 5E-6 solar masses per year at distances wherer <= 1E16 cm for an assumed wind velocity v=100 km/s, and a fraction ofpost-shock energy into magnetic fields and relativistic electrons ofepsilon_B=0.01 and epsilon_e=0.1, respectively. This result rules out some ofthe parameter space of symbiotic giant star companions, and it is consistentwith the low mass-loss rates expected from He-star companions. Our calculationsalso show that the improved sensitivity of the next generation Very Large Array(ngVLA) is needed to probe the very low-density media characteristic of Hestars that are the leading model for binary stellar companions of white dwarfsgiving origin to type Iax SNe.

Constraints on the Sub-pc Environment of the Nearby Type Iax SN 2014dt from Deep X-ray and Radio Observations