Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21840705c&link_type=abstract
American Astronomical Society, AAS Meeting #218, #407.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We present spectropolarimetric observations of SN 2004dt obtained with the Very Large Telescope of the European Southern Observatory
when the supernova was approximately at -7, 7, 13, and 36 days after maximum light. We confirm and extend the results of Wang et al. (2006, Ap.J, 653, 490) who analyzed the pre-maximum spectrum.
The strong Si II 6355 line polarization that SN2004dt displayed before maximum followed the usual behavior in Type Ia SNe, first increasing and then decreasing with time, eventually disappearing together with the Si II lines in the last spectrum. Phase by phase, however, it is the strongest we have seen in any SN Ia, departing significantly from the typical trend of other SNe. The evolution in time of the feature confirms the picture based on the first spectrum, that the asymmetric silicon structure extends from very high to normal velocities ( 22,000 to 8,000 km/s, although the maximum polarization stays at moderately high velocity ( 13,500 km/s).
The line polarization of the low velocity Ca II triplet (at 16,000 km/s), on the other hand, stays at 1.0%
during the photospheric phase and then increases by a factor of more than two,
being strongest in our latest observation. The mean velocity of the polarized feature does not show major variations.
All the major polarized features share an orientation angle of, approximately, 135 degrees. In addition, the Q-U diagrams at the different phases also confirm the picture that the major
radially extended structure that causes the line polarization is clumpy, or broken in smaller pieces.
The findings sustain the picture that the explosion of this SN produced ejecta with some major asymmetry, as well as a clumpy distribution, in some of the chemical species. We discuss our results in the context of the currently favored models of Type Ia SN explosions.
Baade Dietrich
Clocchiatti Alejandro
Hoeflich Peter
Maund Justyn
Patat Ferdinando
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