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Early observations of transient explosions can provide vital clues to theirprogenitor origins. In this paper we present the nearby Type Iax (02cx-like)supernova (SN), SN 2020udy that was discovered within hours ($\sim$7 hr) ofestimated first light. An extensive dataset of ultra-violet, optical, andnear-infrared observations was obtained, covering out to $\sim$150 d afterexplosion. SN 2020udy peaked at -17.86$\pm$0.43 mag in the r band and evolvedsimilarly to other 'luminous' SNe Iax, such as SNe 2005hk and 2012Z. Itswell-sampled early light curve allows strict limits on companion interaction tobe placed. Main-sequence companion stars with masses of 2 and 6 M$_\odot$ areruled out at all viewing angles, while a helium-star companion is allowed froma narrow range of angles (140-180$^\circ$ away from the companion). The spectraand light curves of SN2020udy are in good agreement with those of the 'N5def'deflagration model of a near Chandrasekhar-mass carbon-oxygen white dwarf.However, as has been seen in previous studies of similar luminosity events, SN2020udy evolves slower than the model. Broad-band linear polarisationmeasurements taken at and after peak are consistent with no polarisation, inagreement with the predictions of the companion-star configuration from theearly light curve measurements. The host galaxy environment is low metallicityand is consistent with a young stellar population. Overall, we find the mostplausible explosion scenario to be the incomplete disruption of a CO whitedwarf near the Chandrasekhar-mass limit, with a helium-star companion.

SN 2020udy: a SN Iax with strict limits on interaction consistent with a helium-star companion