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EP260321a/SN 2026gzf: The Faintest Shock Breakout Associated with a Broad-lined Supernova

  • Authors: Brendan O'Connor, Xander J. Hall, Malte Busmann, Daniel Gruen, Alberto Floris, Tomás Cabrera, Ziyuan Zhu, Antonella Palmese, Dylan Green, John Banovetz, Julius Gassert, Christopher L. Fryer, Roberto Ricci, Eleonora Troja, Surya Shivaprasad, Gregory R. Zeimann, Ariel J. Amsellem, Stephen Bailey, Segev BenZvi, Simone Dichiara, Hendrik van Eerten, Jeremy Hare, Lei Hu, Christopher M. Irwin, Keerthi Kunnumkai, Konstantin Malanchev, Mitra Maleki, Michael J. Moss, Adam D. Myers, Dheeraj Pasham, Christoph Ries, Geoffrey Ryan, David Schlegel, Michael Schmidt, Silona Wilke, Yu-Han Yang

Brendan O’Connor et al 2026 The Astrophysical Journal Letters 1006 .

  • Provider: AAS Journals

Caption: Figure 6.

Spectral sequence of EP260321a/SN 2026gzf obtained with SALT, HET, and DESI between 3.3 and 53.6 days after the EP trigger. Blueshifted absorption features of Fe II, Si II, and Ca II that are used for our analysis in Sections 3.2.1 and 3.2.2 are marked for clarity. Emission lines have been clipped from the spectra for clarity. Some spectra are smoothed with a Savitzky–Golay filter (thick lines) for visualization purposes, and the unsmoothed spectra (thin lines) are also shown for completeness. The spectral shape of the SALT data obtained prior to 10 days is uncertain below 4200 Å.

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