The evolution of superluminous supernova LSQ14mo and its interacting host galaxy system - Archive ouverte HAL
Article Dans Une Revue Astronomy & Astrophysics - A&A Année : 2017

The evolution of superluminous supernova LSQ14mo and its interacting host galaxy system

T.-W. Chen
  • Fonction : Auteur
M. Nicholl
  • Fonction : Auteur
S.J. Smartt
  • Fonction : Auteur
P.A. Mazzali
  • Fonction : Auteur
R.M. Yates
  • Fonction : Auteur
T.J. Moriya
  • Fonction : Auteur
C. Inserra
  • Fonction : Auteur
N. Langer
  • Fonction : Auteur
T. Krühler
  • Fonction : Auteur
Y.-C. Pan
  • Fonction : Auteur
R. Kotak
  • Fonction : Auteur
L. Galbany
  • Fonction : Auteur
P. Schady
  • Fonction : Auteur
P. Wiseman
  • Fonction : Auteur
J. Greiner
  • Fonction : Auteur
S. Schulze
  • Fonction : Auteur
A.W.S. Man
  • Fonction : Auteur
A. Jerkstrand
  • Fonction : Auteur
K.W. Smith
  • Fonction : Auteur
C. Baltay
  • Fonction : Auteur
J. Bolmer
  • Fonction : Auteur
E. Kankare
  • Fonction : Auteur
F. Knust
  • Fonction : Auteur
K. Maguire
  • Fonction : Auteur
D. Rabinowitz
  • Fonction : Auteur
S. Rostami
  • Fonction : Auteur
M. Sullivan
  • Fonction : Auteur
D.R. Young
  • Fonction : Auteur

Résumé

We present and analyse an extensive dataset of the superluminous supernova (SLSN) LSQ14mo (z = 0.256), consisting of a multi-colour light curve from −30 d to +70 d in the rest-frame (relative to maximum light) and a series of six spectra from PESSTO covering −7 d to +50 d. This is among the densest spectroscopic coverage, and best-constrained rising light curve, for a fast-declining hydrogen-poor SLSN. The bolometric light curve can be reproduced with a millisecond magnetar model with ~ 4 M⊙ ejecta mass, and the temperature and velocity evolution is also suggestive of a magnetar as the power source. Spectral modelling indicates that the SN ejected ~ 6 M⊙ of CO-rich material with a kinetic energy of ~7 × 1051 erg, and suggests a partially thermalised additional source of luminosity between −2 d and +22 d. This may be due to interaction with a shell of material originating from pre-explosion mass loss. We further present a detailed analysis of the host galaxy system of LSQ14mo. PESSTO and GROND imaging show three spatially resolved bright regions, and we used the VLT and FORS2 to obtain a deep (five-hour exposure) spectra of the SN position and the three star-forming regions, which are at a similar redshift. The FORS2 spectrum at + 300 days shows no trace of SN emission lines and we place limits on the strength of [O i] from comparisons with other Ic supernovae. The deep spectra provides a unique chance to investigate spatial variations in the host star-formation activity and metallicity. The specific star-formation rate is similar in all three components,as is the presence of a young stellar population. However, the position of LSQ14mo exhibits a lower metallicity, with 12 + log (O/H) = 8.2 in both the R23 and N2 scales (corresponding to ~0.3 Z⊙ ). We propose that the three bright regions in the host system are interacting, which could induce gas flows triggering star formation in low-metallicity regions.Key words: supernovae: general / supernovae: individual: LSQ14mo / galaxies: abundances / galaxies: dwarf / galaxies: interactions⋆ Based on observations at ESO, Program IDs: 191.D-0935, 094.D-0645, 096.A-9099.

Dates et versions

hal-01554685 , version 1 (03-07-2017)

Identifiants

Citer

T.-W. Chen, M. Nicholl, S.J. Smartt, P.A. Mazzali, R.M. Yates, et al.. The evolution of superluminous supernova LSQ14mo and its interacting host galaxy system. Astronomy & Astrophysics - A&A, 2017, 602, pp.A9. ⟨10.1051/0004-6361/201630163⟩. ⟨hal-01554685⟩
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