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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 7.

Left panel: comparison of the early r-band light curve of ZTF 18aaqeasu to other SNe Ia reported with early excess emission. We show the K2 filter light curve for SN 2018oh. The light curves of the events with normal peak brightness have been normalized to the peak magnitude of SN 2011fe. We show the early light curve of SN 2011fe (which did not exhibit an early excess) as a black dashed line to highlight the early excess seen in the other objects. The photometric data for the comparison objects have been taken from Nugent et al. (2011), Cao et al. (2015), Hosseinzadeh et al. (2017), Jiang et al. (2017), and Shappee et al. (2019). Right panel: comparison of the peak light spectra of early excess SNe Ia to ZTF 18aaqeasu. The light curve phases are indicated next to each spectrum. As shown, none of the early excess events exhibit the extremely strong line blanketing seen in ZTF 18aaqeasu near peak light. Spectroscopic data for the comparison events have been taken from Cao et al. (2015), Foley et al. (2010), Jiang et al. (2017), Hosseinzadeh et al. (2017), and Li et al. (2019).