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Companion Shocking Fits to the 2018 ZTF Sample of SNe Ia Are Consistent with Single-Degenerate Progenitor Systems

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arxiv 2208.11201 v1 pith:YVUIOYAR submitted 2022-08-23 astro-ph.HE

J. Burke , D. A. Howell , D. J. Sand , G. Hosseinzadeh This is my paper
classification astro-ph.HE
keywords earlycompanionprogenitorexcessexcessesmodelssystemsconsistent
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abstract

The early lightcurves of Type Ia supernovae (SNe Ia) can be used to test predictions about their progenitor systems. If the progenitor system consists of a single white dwarf in a binary with a Roche-lobe-overflowing non-degenerate stellar companion, then the SN ejecta should collide with that companion soon after the explosion and get shock-heated, leaving an early UV excess in the lightcurve. This excess would only be observable for events with favorable viewing angles, $\sim$10\% of the time. We model the 2018 ZTF sample of 127 SNe Ia using companion shocking models, and recover an observed early excess rate of $12.0\pm3.6\%$, consistent both with several other rates calculated throughout the literature, and with the expectation that SNe Ia predominantly occur in single-degenerate systems. We observe early excesses only in spectroscopically normal SNe Ia, in contradiction to the claim that such excesses occur more frequently in overluminous SNe Ia. We also show that the detection of early excesses can be methodology-dependent. We encourage the observation of large samples of SNe Ia with high-cadence multiwavelength early data in order to test the statistical predictions of SN Ia progenitor models, and we also encourage the refinement of existing models.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Not All Who Wander Are Lost: Early Excess Demographics in the Volume-limited ZTF DR2 SN Ia Sample

    astro-ph.HE 2026-05 unverdicted novelty 7.0 of 10

    Early-excess Type Ia supernovae in the ZTF volume-limited sample have larger SALT2 stretch (7.91 sigma) and r-band secondary maximum flux (6.25 sigma) than no-excess events, with weaker host differences.

  2. Ultraviolet to Infrared Spectroscopy of the Type Ibn SN 2023tsz Suggests a Lower-mass Progenitor

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    UV-to-IR spectra of SN 2023tsz are best matched by interaction models of a ~4 solar-mass stripped helium star with an added X-ray field, supporting a lower-mass binary-stripped progenitor.

  3. ZTF SN Ia DR2 follow-up: early excess in Type Ia supernova light curves

    astro-ph.CO 2026-07 conditional novelty 5.0 of 10

    Up to about a quarter of Type Ia supernovae may have an early light-curve bump, but the candidate list depends strongly on the detection method and neither leading explosion model is clearly preferred.

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