A1 Refereed original research article in a scientific journal
Supernova 2010ev: A reddened high velocity gradient type Ia supernova
Authors: Gutierrez CP, Gonzalez-Gaitan S, Folatelli G, Pignata G, Anderson JP, Hamuy M, Morrell N, Stritzinger M, Taubenberger S, Bufano F, Olivares F, Haislip JB, Reichart DE
Publisher: EDP SCIENCES S A
Publication year: 2016
Journal:Astronomy and Astrophysics
Journal name in sourceASTRONOMY & ASTROPHYSICS
Journal acronym: ASTRON ASTROPHYS
Article number: ARTN A5
Volume: 590
Number of pages: 16
ISSN: 0004-6361
eISSN: 1432-0746
DOI: https://doi.org/10.1051/0004-6361/201527228
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 Delta m(15)(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 R-v = 1.54 +/- 0.65. Spectroscopically, SN 2010ev belongs to the broad-line SN Ia group, showing stronger than average Si II lambda 6355 absorption features. We also find that SN 2010ev is a high velocity gradient SN with (v)over dot(Si) = 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] lambda 7155 and [Ni II] lambda 7378 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.
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 Delta m(15)(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 R-v = 1.54 +/- 0.65. Spectroscopically, SN 2010ev belongs to the broad-line SN Ia group, showing stronger than average Si II lambda 6355 absorption features. We also find that SN 2010ev is a high velocity gradient SN with (v)over dot(Si) = 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] lambda 7155 and [Ni II] lambda 7378 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.
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