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26 April 2024 |
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Early Observations of the Type Ia Supernova iPTF 16abc: Evidence for Strong Ejecta Mixing or Interaction with Diffuse Material | | A. A. Miller
; Y. Cao
; A. L. Piro
; N. Blagorodnova
; B. D. Bue
; S. B. Cenko
; S. Dhawan
; R. Ferretti
; O. D. Fox
; C. Fremling
; A. Goobar
; D. A. Howell
; G. Hosseinzadeh
; M. M. Kasliwal
; R. R. Laher
; R. Lunnan
; F. J. Masci
; C. McCully
; P. E. Nugent
; J. Sollerman
; F. Taddia
; S. R. Kulkarni
; | | Date: |
23 Aug 2017 | | Abstract: | Early observations of Type Ia supernovae (SNe) provide a unique probe of
their progenitor systems and explosion physics. Here, we report the
intermediate Palomar Transient Factory (iPTF) discovery of an extraordinarily
young SN Ia, iPTF 16abc. By fitting a power law to our early light curve, we
infer that first light for the SN, that is when appreciable heating from
$^{56}$Ni decay has first diffused to the photosphere, only occurred
$0.15pm_{0.07}^{0.15}$ d before our first detection. In the $sim$24 hr after
discovery, iPTF 16abc rose by $sim$2 mag, following a near-linear rise in flux
for $gtrsim$3 d. Strong C II absorption is detected in the early spectra of
iPTF 16abc, before disappearing after $sim$7 d. Unlike the
extensively-observed Type Ia SN 2011fe, the $(B-V)_0$ colors of iPTF 16abc are
blue and nearly constant in the days after explosion. We show that our early
observations of iPTF 16abc cannot be explained by either SN shock breakout and
the associated, subsequent cooling, or the SN ejecta colliding with a stellar
companion. Instead, we argue that the early characteristics of iPTF 16abc,
including: (i) the rapid, near-linear rise, (ii) the non-evolving blue colors,
and (iii) the strong absorption from ionized carbon, are the result of either
vigorous mixing of radioactive $^{56}$Ni in the SN ejecta, or ejecta
interaction with diffuse material, or a combination of the two. In the next few
years, dozens of very young normal SNe Ia will be discovered, and observations
similar to those presented here will constrain the white dwarf explosion
mechanism. | | Source: | arXiv, 1708.7124 | | Services: | Forum | Review | PDF | Favorites | |
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