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Late-time emission of type Ia supernovae: optical and near-infrared observations of SN 2001el
Stockholm University, Faculty of Science, Department of Astronomy.
2007 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, Vol. 470, no 1, L1-L4 p.Article in journal (Refereed) Published
Abstract [en]

Aims.To elucidate the nature of the late-phase emission of the normal type Ia supernova SN 2001el.

Methods: We present optical and near-infrared light curves of SN 2001el from 310 to 445 days past maximum light, obtained with the Very Large Telescope.

Results: The late-time optical (UBVRI) light curves decay in a nearly linear fashion with decay time scales of 1.43±0.14, 1.43±0.06, 1.48±0.06, 1.45±0.07, and 1.03±0.07 magnitudes (per hundred days) in the U, B, V, R, and I bands, respectively. In contrast, in the near-infrared ({JHK}_s) bands the time evolution of the flux appears to be nearly constant at these epochs. We measure decline rates (per hundred days) of 0.19±0.10 and 0.17±0.11 magnitudes in the J and H bands, respectively. We construct a UVOIR light curve, and find that the late-time luminosity has a decay time scale nearly consistent with complete depostion of positron kinetic energy.

Conclusions: The late-time light curves of the normal type Ia SN 2001el demonstrate the increased importance of the near-infrared contribution. This was previously observed in the peculiar SN 2000cx, and the results for SN 2001el thus ensure that the conclusions previously based on a single peculiar event are applicable to normal type Ia supernovae. The measured late-time UVOIR decline rate suggests that a majority of the positrons are trapped within the ejecta. This result does not favor the prediction of a weak and/or radially combed magnetic field configuration.

Place, publisher, year, edition, pages
2007. Vol. 470, no 1, L1-L4 p.
Keyword [en]
stars: supernovae: general, stars: supernovae: individual: SN 2001el
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-11341DOI: doi:10.1051/0004-6361:20066999OAI: oai:DiVA.org:su-11341DiVA: diva2:177860
Note
Based on observations collected at the European Southern Observatory, Paranal, Chile (ESO Programmes 69.D-0193(ABCD) and 70.D-0023(AB). Tables [see full text]-[see full text] are only available in electronic form at http://www.aanda.orgAvailable from: 2008-01-11 Created: 2008-01-11 Last updated: 2011-01-11Bibliographically approved

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