I've been exceptionally busy lately, and haven't had any time to follow up on what observations of SN 2014J have told us. A google search didn't show very much, so I ended up searching Arxiv.org for papers associated with SN 2014J returns the following list (search http://arxiv.org/find/all/1/all:+2014J/0/1/0/all/0/1):
- 1. arXiv:1405.1488 [pdf, other]
- 2. arXiv:1404.2639 [pdf, ps, other]
- 3. arXiv:1403.7405 [pdf, ps, other]
- 4. arXiv:1403.4250 [pdf, other]
- 5. arXiv:1402.4806 [pdf, ps, other]
- 6. arXiv:1402.2717 [pdf, ps, other]
- 7. arXiv:1401.7968 [pdf, ps, other]
Otherwise, the most interesting of the bunch is Zheng et al. Not only did they uncover some earlier but unrecognized observations of the supernova, but the managed to estimate the explosion time (*) at Jan 14.75 UT (2014), about a week before Fossey's UCL undergraduates first noticed it. Tsvetkov et al present UVBRI light and color curves and conclude that SN 2014J belongs the the "normal" [Quotation marks in the original] subset of Type 1a SNe. How this matches up with the unusual early-time powerl-law light curve Zheng discovered doesn't seem to be discussed in their article, and as the subject is out of my (former) expertise I don't have enough information to make an informed speculation.
(*) Technically the time that any light from the explosion would have passed Earth. At a distance of D~3.5 Megaparsecs the actual explosion occurred ~11 million years ago (i.e. well before our ancestors and the ancestors of chimpanzees split off from each other).