期刊
ASTRONOMY & ASTROPHYSICS
卷 590, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201527228
关键词
supernovae: general; supernovae: individual: SN 2010ev
资金
- project illennium Institute of Astrophysics (MAS) of the Iniciativa Cientifica Milenio del Ministerio Economia, Fomento y Turismo de Chile [IC120009]
- Millennium Center for Supernova Science of the Iniciativa Cientifica Milenio del Ministerio Economia, Fomento y Turismo de Chile [P10-064-F]
- CONICYT through FONDECYT [3130680]
- Proyecto FONDECYT [11090421]
- Danish Agency for Science and Technology and Innovation realized through a Sapere Aude Level 2 grant
- Transregional Collaborative Research Centre The Dark Universe of the DFG [TRR 33]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1517030] Funding Source: National Science Foundation
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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