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We present analysis of Chandra archival, pre-explosion data of the positionsof three nearby (< 25 Mpc) type Ia supernovae, SN2011iv, SN2012cu & SN2012fr.No sources corresponding to the progenitors were found in any of theobservations. Combining all sources with well defined backgrounds does notreveal any evidence for X-ray emission from the progenitors either. Wecalculated upper limits on the bolometric luminosities of the progenitors,under the assumption that they were black bodies with effective temperaturesbetween 30 and 150 eV, corresponding to 'canonical' supersoft X-ray sources.The upper limits of SN2012fr straddles the Eddington luminosity of canonicalsupersoft sources, but fainter canonical supersoft sources cannot be ruled outby this study. We also compare our upper limits with known compact binarysupersoft X-ray sources. This study is a continuation of the campaign todirectly detect or constrain the X-ray characteristics of pre-explosionobservations of nearby type Ia supernova progenitors; with the results reportedin Nielsen, Voss & Nelemans (see reference in Introduction), the number ofnearby type Ia supernovae for which pre-explosion images are available in theChandra archive is now 13 and counting.

monthly notices of the royal astronomical society

Upper limits on bolometric luminosities of three type Ia supernova  progenitors - New results in the ongoing Chandra archival search for type Ia  supernova progenitors