Supernova 2010ev: A reddened high velocity gradient type Ia supernova

Claudia P. Gutiérrez, Santiago González-Gaitán, Gastón Folatelli, Giuliano Pignata, Joseph P. Anderson, Mario Hamuy, Nidia Morrell, Maximilian Stritzinger, Stefan Taubenberger, Filomena Bufano, Felipe Olivares E., Joshua B. Haislip, Daniel E. Reichart

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7 Citations (Scopus)

Abstract

Aims. We present and study the spectroscopic and photometric evolution of the type Ia supernova (SN Ia) 2010ev. Methods. We obtain and analyze multiband optical light curves and optical/near-infrared spectroscopy at low and medium resolution spanning -7 days to +300 days from the B-band maximum. Results. A photometric analysis shows that SN 2010ev is a SN Ia of normal brightness with a light-curve shape of Δm15(B) = 1.12 ± 0.02 and a stretch s = 0.94 ± 0.01 suffering significant reddening. From photometric and spectroscopic analysis, we deduce a color excess of E(B - V) = 0.25 ± 0.05 and a reddening law of Rv = 1.54 ± 0.65. Spectroscopically, SN 2010ev belongs to the broad-line SN Ia group, showing stronger than average Si II λ6355 absorption features. We also find that SN 2010ev is a high velocity gradient SN with vSi = 164 ± 7 km s-1 d-1. The photometric and spectral comparison with other supernovae shows that SN 2010ev has similar colors and velocities to SN 2002bo and SN 2002dj. The analysis of the nebular spectra indicates that the [Fe II] λ7155 and [Ni II] λ7378 lines are redshifted, as expected for a high velocity gradient supernova. All these common intrinsic and extrinsic properties of the high velocity gradient (HVG) group are different from the low velocity gradient (LVG) normal SN Ia population and suggest significant variety in SN Ia explosions.

Original languageEnglish
Article numberA5
JournalAstronomy and Astrophysics
Volume590
DOIs
Publication statusPublished - 28 Apr 2016

Keywords

  • supernovae: general
  • supernovae: individual: SN 2010ev

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Gutiérrez, C. P., González-Gaitán, S., Folatelli, G., Pignata, G., Anderson, J. P., Hamuy, M., Morrell, N., Stritzinger, M., Taubenberger, S., Bufano, F., Olivares E., F., Haislip, J. B., & Reichart, D. E. (2016). Supernova 2010ev: A reddened high velocity gradient type Ia supernova. Astronomy and Astrophysics, 590, [A5]. https://doi.org/10.1051/0004-6361/201527228