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SN 2011ja was a bright (I = -18.3) Type II supernova occurring in the nearbyedge on spiral galaxy NGC 4945. Flat-topped and multi-peaked H-alpha and H-betaspectral emission lines appear between 64 - 84 days post-explosion, indicatinginteraction with a disc-like circumstellar medium inclined 30-45 degrees fromedge-on. After day 84 an increase in the H- and K-band flux along with heavyattenuation of the red wing of the emission lines are strong indications ofearly dust formation, likely located in the cool dense shell created betweenthe forward shock of the SN ejecta and the reverse shock created as the ejectaplows into the existing CSM. Radiative transfer modeling reveals both ~1.5 x10^-4 Msun of pre-existing dust located ~ 10^16.7 cm away and ~ 5 x 10^-5 Msunof newly formed dust. Spectral observations after 1.5 years reveal thepossibility that the fading SN is located within a young (3-6 Myr) massivestellar cluster, which when combined with tentative 56Ni mass estimates of 0.2Msun may indicate a massive (> 25 Msun) progenitor for SN 2011ja.

Early Dust Formation and a Massive Progenitor for SN 2011ja?