The Slow Demise of the Long-Lived SN 2005ip
Ori D. Fox (STScI), Claes Fransson, Nathan Smith, Jennifer Andrews, K., Azalee Bostroem, Thomas G. Brink, S. Bradley Cenko, Geoffrey C. Clayton,, Alexei V. Filippenko, Wen-fai Fong, Joseph S. Gallagher, Patrick L. Kelly,, Charles D. Kilpatrick, Jon C. Mauerhan, Adam M. Miller

TL;DR
This study provides extensive multi-wavelength observations of supernova SN 2005ip over several years, revealing details about its prolonged shock interaction with circumstellar material and signs of its decline.
Contribution
It offers new insights into the late-time evolution of SN 2005ip, including detailed spectral analysis and estimates of pre-explosion mass loss, highlighting the transition phase of the supernova.
Findings
Total radiated energy exceeds 10^50 erg
Progenitor's pre-explosion mass-loss rate was > 0.01 M_sun/yr
Spectral features indicate decreasing CSM density over time
Abstract
The Type IIn supernova (SN) 2005ip is one of the most well-studied and long-lasting examples of a SN interacting with its circumstellar environment. The optical light curve plateaued at a nearly constant level for more than five years, suggesting ongoing shock interaction with an extended and clumpy circumstellar medium (CSM). Here we present continued observations of the SN from days post-explosion at all wavelengths, including X-ray, ultraviolet, near-infrared, and mid-infrared. The UV spectra probe the pre-explosion mass loss and show evidence for CNO processing. From the bolometric light curve, we find that the total radiated energy is in excess of erg, the progenitor star's pre-explosion mass-loss rate was , and the total mass lost shortly before explosion was , though the mass…
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