{
  "id": "2103.09166",
  "version": "v1",
  "published": "2021-03-16T16:06:51.000Z",
  "updated": "2021-03-16T16:06:51.000Z",
  "title": "The optical properties of three type II supernovae: 2014cx, 2014cy and 2015cz",
  "authors": [
    "R. Dastidar",
    "K. Misra",
    "M. Singh",
    "A. Pastorello",
    "D. K. Sahu",
    "X. Wang",
    "A. Gangopadhyay",
    "L. Tomasella",
    "J. Zhang",
    "S. Bose",
    "J. Mo",
    "N. Elias-Rosa",
    "L. Tartaglia",
    "S. Yan",
    "B. Kumar",
    "G. C. Anupama",
    "S. B. Pandey",
    "L. Rui",
    "T. Zhang",
    "G. Terreran",
    "P. Ochner",
    "F. Huang"
  ],
  "comment": "20 pages, 23 Figures, 3 figures in appendix, accepted for publication in MNRAS",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We present the photometric and spectroscopic analysis of three Type II SNe: 2014cx, 2014cy and 2015cz. SN 2014cx is a conventional Type IIP with a shallow slope (0.2 mag/50d) and an atypical short plateau ($\\sim$86 d). SNe 2014cy and 2015cz show relatively large decline rates (0.88 and 1.64 mag/50d, respectively) at early times before settling to the plateau phase, unlike the canonical Type IIP/L SN light curves. All of them are normal luminosity SN II with an absolute magnitude at mid-plateau of M$_{V,14cx}^{50}$=$-$16.6$\\pm$0.4$\\,\\rm{mag}$, M$_{V,14cy}^{50}$=$-$16.5$\\,\\pm\\,$0.2$\\,\\rm{mag}$ and M$_{V,15cz}^{50}$=$-$17.4$\\,\\pm\\,$0.3$\\,\\rm{mag}$. A relatively broad range of $^{56}$Ni masses is ejected in these explosions (0.027-0.070 M$_\\odot$). The spectra show the classical evolution of Type II SNe, dominated by a blue continuum with broad H lines at early phases and narrower metal lines with P Cygni profiles during the plateau. High-velocity H I features are identified in the plateau spectra of SN 2014cx at 11600 km s$^{-1}$, possibly a sign of ejecta-circumstellar interaction. The spectra of SN 2014cy exhibit strong absorption profile of H I similar to normal luminosity events whereas strong metal lines akin to sub-luminous SNe. The analytical modelling of the bolometric light curve of the three events yields similar radii for the three objects within errors (478, 507 and 608 R$_\\odot$ for SNe 2014cx, 2014cy and 2015cz, respectively) and a range of ejecta masses (15.0, 22.2 and 18.7 M$_\\odot$ for SNe 2014cx, 2014cy and 2015cz), and a modest range of explosion energies (3.3 - 6.0 foe where 1 foe = 10$^{51}$ erg).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-03-16T16:06:51.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "optical properties",
      "type iip/l sn light curves",
      "sn 2014cx",
      "supernovae",
      "sne 2014cx"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 20,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}