Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924231c&link_type=abstract
American Astronomical Society, AAS Meeting #219, #242.31
Astronomy and Astrophysics
Astronomy
Scientific paper
We present late time spectropolarimetric observations of SN 2007sr, obtained with the VLT telescope at ESO Paranal Observatory when the object was more than two months after maximum light. SN 2007sr is one of those so called "normal” type Ia SN. It exploded in the Antennae interacting galaxies, and was used to compute a precise distance to them. This was good, since it settled an issue on earlier discrepant measurements. A standard assumption, based on a limited number of not ideally sampled events, is that both continuum and line polarization of Type Ia SN decrease with time as the photosphere recedes into deeper layers and the ejecta becomes more transparent. Yet, SN 2007sr displays very strong line polarization in the Ca II absorption features more than two months after maximum light. The observations prompts us to revisit the incipient conventional wisdom that we are developing on polarimetric properties of Type Ia SNe.
Baade Dietrich
Clocchiatti Alejandro
Hoeflich Peter
Maund Justyn
Patat Ferdinando
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