{
  "id": "1803.03646",
  "version": "v1",
  "published": "2018-03-09T19:00:00.000Z",
  "updated": "2018-03-09T19:00:00.000Z",
  "title": "Aspherical Supernovae: Effects on Early Light Curves",
  "authors": [
    "Niloufar Afsariardchi",
    "Christopher D. Matzner"
  ],
  "comment": "23 pages, 20 figures, Accepted for publication in ApJ",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "Early light from core-collapse supernovae, now detectable in high-cadence surveys, holds clues to a star and its environment just before it explodes. However, effects that alter the early light have not been fully explored. We highlight the possibility of non-radial flows at the time of shock breakout. These develop in sufficiently non-spherical explosions if the progenitor is not too diffuse. When they do develop, non-radial flows limit ejecta speeds and cause ejecta-ejecta collisions. We explore these phenomena and their observational implications, using global, axisymmetric, non-relativistic FLASH simulations of simplified polytropic progenitors, which we scale to representative stars. We develop a method to track photon production within the ejecta, enabling us to estimate band-dependent light curves from adiabatic simulations. Immediate breakout emission becomes hidden as an oblique flow develops. Non-spherical effects lead the shock-heated ejecta to release a more constant luminosity at a higher, evolving color temperature at early times, effectively mixing breakout light with the early light curve. Collisions between non-radial ejecta thermalize a small fraction of the explosion energy; we address emission from these collisions in a subsequent paper.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-03-09T19:00:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "early light curve",
      "aspherical supernovae",
      "non-radial flows limit ejecta speeds",
      "estimate band-dependent light curves",
      "collisions"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 23,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}