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A Multiwavelength View of the First Type Ic-BL Supernova with an Einstein Probe X-Ray Shock Breakout

Authors: Jillian C. Rastinejad, Gokul Srinivasaragavan, Nikhil Sarin, Tanner O'Dwyer, S. Bradley Cenko, James K. Leung, Anya E. Nugent, Daniel A. Perley, Genevieve Schroeder, Shreya Anand, Tomás Ahumada, Igor Andreoni, Aleksandra Bochenek, Alessandra Corsi, Christoffer Fremling, Anna Y. Q. Ho, Mansi M. Kasliwal, Geoffrey Mo, Anirudh Salgundi, Kendall I. Sippy, J. Sollerman, Eric C. Bellm, Tracy X. Chen, Michael W. Coughlin, Michael C. Davis, Fabio De Colle, Danielle Frostig, Christopher L. Fryer, Michael J. Graham, Xander J. Hall, K.-R. Hinds, Luca Izzo, Wynn Jacobson-Galán, Nathan P. Lourie, Keiichi Maeda, Josiah Purdum, Ben Rusholme, Avinash Singh, Robert Stein

Jillian C. Rastinejad et al 2026 The Astrophysical Journal Letters 1007 .

Provider: AAS Journals

Caption: Figure 9.

We fit the ugrizJ-band light curves of SN 2026gzf with five models in REDBACK (the pure CSM interaction model is not shown here as it requires infeasible M_ej and E_K; Section 4.4.4). We disfavor the one-zone Arnett-like, magnetar, and pure CSM interaction models because they either provide poor statistical fits or require nonphysical parameters (Sections 4.4.1, 4.4.3, and 4.4.4). The combined CSM+⁵⁶Ni model is our preferred model. Relative to the ⁵⁶Ni mixing model, the constrained CSM+⁵⁶Ni fit improves the Bayesian evidence by ﹩{\rm{\Delta }}\mathrm{ln}Z\simeq 47﹩.

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