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ZTF 18aaqeasu (SN2018byg): A Massive Helium-shell Double Detonation on a Sub-Chandrasekhar-mass White Dwarf

  • Authors: Kishalay De, Mansi M. Kasliwal, Abigail Polin, Peter E. Nugent, Lars Bildsten, Scott M. Adams, Eric C. Bellm, Nadia Blagorodnova, Kevin B. Burdge, Christopher Cannella, S. Bradley Cenko, Richard G. Dekany, Michael Feeney, David Hale, U. Christoffer Fremling, Matthew J. Graham, Anna Y. Q. Ho, Jacob E. Jencson, S. R. Kulkarni, Russ R. Laher, Frank J. Masci, Adam A. Miller, Maria T. Patterson, Umaa Rebbapragada, Reed L. Riddle, David L. Shupe, and Roger M. Smith

2019 The Astrophysical Journal Letters 873 L18.

  • Provider: AAS Journals

Caption: Figure 4.

Comparison of the pre-maximum (left panel) and post-maximum (right panel) spectra of ZTF18aaqeasu to the normal Type Ia SN 2011fe (Maguire et al. 2014), the over-luminous SN 1991T (Filippenko et al. 1992b) and the sub-luminous SN 1991bg (Filippenko et al. 1992a). The magenta dashed lines in the left panel indicate Si II lines at a velocity of 10,000 km s−1. Prominent emission/absorption features are marked in both panels. Spectroscopic data for the comparison SNe were obtained from the WISEReP repository (Yaron & Gal-Yam 2012).

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