{
  "id": "2305.03363",
  "version": "v1",
  "published": "2023-05-05T08:31:24.000Z",
  "updated": "2023-05-05T08:31:24.000Z",
  "title": "Early excess emission in Type Ia supernovae from the interaction between supernova ejecta and their circumstellar wind",
  "authors": [
    "Takashi J. Moriya",
    "Paolo A. Mazzali",
    "Chris Ashall",
    "Elena Pian"
  ],
  "comment": "8 pages, 8 figures, accepted by Monthly Notices of the Royal Astronomical Society",
  "categories": [
    "astro-ph.HE",
    "astro-ph.SR"
  ],
  "abstract": "The effects of the interaction between Type Ia supernova ejecta and their circumstellar wind on the photometric properties of Type Ia supernovae are investigated. We assume that a hydrogen-rich, dense, and extended circumstellar matter (CSM) is formed by the steady mass loss of their progenitor systems. The CSM density is assumed to be proportional to r^{-2}. When the mass-loss rate is above 1e-4 Msun/yr with a wind velocity of 100 km/s, CSM interaction results in an early flux excess in optical light-curves within 4 days of explosion. In these cases, the optical colour quickly evolves to the blue. The ultraviolet flux below 3000 A is found to have a persistent flux excess compared to Type Ia supernovae as long as CSM interaction continues. Type Ia supernovae with progenitor mass-loss rates between 1e-4 and 1e-3 Msun/yr may not have a CSM that is dense enough to affect spectra to make them Type Ia-CSM, but they may still result in Type Ia supernovae with an early optical flux excess. Because they have a persistent ultraviolet flux excess, ultraviolet light curves around the luminosity peak would be significantly different from those with a low-density CSM.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-05-05T08:31:24.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "early excess emission",
      "circumstellar wind",
      "type ia supernova ejecta",
      "persistent ultraviolet flux excess",
      "mass-loss rate"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}