2018/09/04 by Dan Milisavljevic, D. Milisavljević, Daniel Patnaude +9 · 2 citations
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Ejecta #Emission spectrum #Galaxy #Gamma-ray bursts and supernovae #Light curve #Line (geometry) #Luminosity #Magnetar #Nebula #Physics #Pulsar #Pulsar wind nebula #Pulsars and Gravitational Waves Research #Spectral line #Stars #Supernova #Supernova remnant #astro-ph.HE
paper · pdf · doi:10.3847/2041-8213/aadd4e
9 pages, 4 figures, accepted for publication in ApJL
arxiv created 2018/09/04 · openalex publication_date 2018/09/10 · arxiv updated 2018/09/19 · openalex created_date 2018/09/27 · openalex updated_date 2026/08/06
Abstract We present an optical spectrum of the energetic Type Ib supernova (SN) 2012au obtained at an unprecedented epoch of 6.2 yr after explosion. Forbidden transition emission lines of oxygen and sulfur are detected with expansion velocities of ≈2300 km s −1 . The lack of narrow H Balmer lines suggests that interaction with circumstellar material is not a dominant source of the observed late-time emission. We also present a deep Chandra observation that reveals no X-ray emission down to a luminosity of L X < 2 × 10 38 erg s −1 (0.5–10 keV). Our findings are consistent with the notion that SN 2012au is associated with a diverse subset of SNe, including long-duration gamma-ray burst SNe and superluminous SNe, harboring pulsar/magnetar wind nebulae that influence core-collapse explosion dynamics on a wide range of energy scales. We hypothesize that these systems may all evolve into a similar late-time phase dominated by forbidden oxygen transitions, and predict that emission line widths should remain constant or broaden a few percent per year due to the acceleration of ejecta by the pulsar/magnetar bubble.