A Wolf in Sheepskin: Extraordinary Supernova 2012au Veiled Behind Ordinary Radio Emission
Atish Kamble, Alicia M. Soderberg, Laura Chomiuk, Raffaella Margutti,, Mikhail Medvedev, Sayan Chakraborti, Roger Chevalier, Nikolai Chugai, Jason, Dittmann, Maria Drout, Claes Fransson, Dan Milisavljevic, Ehud Nakar, Nathan, Sanders

TL;DR
SN 2012au, a luminous type Ib supernova, exhibited radio emission consistent with shock interaction in a steady stellar wind, revealing a relatively quiet progenitor before explosion despite its extraordinary optical features.
Contribution
This study provides detailed radio and X-ray observations of SN 2012au, linking its properties to shock interaction models and progenitor mass-loss history, highlighting its intermediate energy and quiet pre-explosion phase.
Findings
Shock velocity approximately 0.2c.
Progenitor mass-loss rate about 3.6 x 10^-6 M_sun/yr.
Radio evolution consistent with smooth circum-burst medium.
Abstract
We present extensive radio and X-ray observations of SN\, 2012au, the energetic radio luminous supernova of type Ib that may be a link between subsets of hydrogen-poor superluminous and normal core-collapse supernovae. The observations closely follow models of synchrotron emission from shock heated circum-burst medium that has a wind density profile (). We infer a sub-relativistic velocity for the shock wave and a radius of at 25 days after the estimated date of explosion. For a constant wind velocity of 1000 km/s we determine the constant mass loss rate of the progenitor to be , consistent with the estimates from X-ray observations. We estimate the total internal energy of the radio emitting material to be , which is intermediate…
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Taxonomy
TopicsGamma-ray bursts and supernovae · Pulsars and Gravitational Waves Research · Astrophysics and Cosmic Phenomena
