Upper limits on bolometric luminosities of three Type Ia supernova progenitors: new results in the ongoing Chandra archival search for Type Ia supernova progenitors KU Leuven
We present analysis of Chandra archival, pre-explosion data of the positions of three nearby (< 25 Mpc) type Ia supernovae, SN2011iv, SN2012cu & SN2012fr. No sources corresponding to the progenitors were found in any of the observations. Combining all sources with well defined backgrounds does not reveal any evidence for X-ray emission from the progenitors either. We calculated upper limits on the bolometric luminosities of the ...