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Upper limits on bolometric luminosity of the progenitor of new type Ia supernova in M82 based on Chandra archival data

ATel #5799; Nielsen M. T.B. , Gilfanov M., Woods T. E. (Max-Planck Institute for Astrophysics, Garching), Nelemans G. (Radboud University Nijmegen)
on 23 Jan 2014; 20:55 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Pierre Maggi (pmaggi@mpe.mpg.de)

Subjects: X-ray, Supernovae

Referred to by ATel #: 5851

We report that a systematic search of pre-explosion observations on the position (RA,DEC = 09:55:42.217,+69:40:26.56, J2000, ATEL #5789) of recent type Ia supernova SN2014J (also known as PSN_J09554214+6940260; discoverer: S.J. Fossey, ATEL #5786) in the Chandra data archive have yielded no evidence of an X-ray source. Based on a total of 828 ks of pre-explosion observations, we counted 155 counts in a 4.5 pixel aperture. The average background based on 5 similarly-sized regions adjacent to the source region is 141 counts.
High-resolution spectroscopy reported by Cox et al. in ATEL 5797 yielded a reddening of E(B-V) > 1, which corresponds to a neutral hydrogen column of > 6.9e+21 cm^-2 (Guever & Oezel, MNRAS, 400, 2050, 2009). With this hydrogen column and using the same method as Nielsen et al., MNRAS 426, 2668 (2012) & Nielsen et al., MNRAS 435, 187 (2013) we obtained the following 3-sigma upper limits on the bolometric luminosity of a hypothetical supersoft X-ray source progenitor for four values of effective temperature:
30 eV: L_bol < 5.6e+41 erg/s
50 eV: L_bol < 3.2e+39 erg/s
100 eV: L_bol < 4.0e+37 erg/s
150 eV: L_bol < 1.3e+37 erg/s