Change search
ReferencesLink to record
Permanent link

Direct link
The early spectral evolution of SN2004dt
Show others and affiliations
2007 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 475, no 2, 585-595 p.Article in journal (Refereed) Published
Abstract [en]

Aims. We study the optical spectroscopic properties of Type Ia Supernova (SNIa) 2004dt, focusing our attention on the early epochs. Methods. Observation triggered soon after the SN 2004dt discovery allowed us to obtain a spectrophotometric coverage from day -10 to almost one year (similar to 353 days) after the B band maximum. Observations carried out on an almost daily basis allowed us a good sampling of the fast spectroscopic evolution of SN 2004dt in the early stages. To obtain this result, low-resolution, long-slit spectroscopy was obtained using a number of facilities. Results. This supernova, which in some absorption lines of its early spectra showed the highest degree of polarization ever measured in any SN Ia, has a complex velocity structure in the outer layers of its ejecta. Unburnt oxygen is present, moving at velocities as high as similar to 16 700 km s(-1), with some intermediate-mass elements (Mg, Si, Ca) moving equally fast. Modeling of the spectra based on standard density profiles of the ejecta fails to reproduce the observed features, whereas enhancing the density of outer layers significantly improves the fit. Our analysis indicates the presence of clumps of high-velocity, intermediate-mass elements in the outermost layers, which is also suggested by the spectropolarimetric data.

Place, publisher, year, edition, pages
2007. Vol. 475, no 2, 585-595 p.
Keyword [en]
stars, supernovae, general, stars, supernovae, individual, SN2004dt, methods, observational techniques, spectroscopic
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-55773DOI: 10.1051/0004-6361:20077487ISI: 000250903700027OAI: diva2:407251
authorCount :20Available from: 2011-03-30 Created: 2011-03-28 Last updated: 2011-03-30Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Goobar, Ariel
By organisation
Department of Physics
In the same journal
Astronomy and Astrophysics
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 45 hits
ReferencesLink to record
Permanent link

Direct link