The Nature and Geometry of the Light Echo from SN 2006X

Details The Nature and Geometry of the Light Echo from SN 2006X The Nature and Geometry of the Light Echo from SN 2006X

2008-04-14

arxiv.org/abs/0804.2030v1

Astronomy and Astrophysics

Astrophysics

17 pages, 2 figures, submitted to Astrophysical Journal Letters

Scientific paper

10.1086/592318

We report on the discovery of the geometry producing the light echo emanating from Supernova 2006X, a nearby but underluminous Type Ia in M100 (= NGC 4321). This offers a rare chance to study the environment of a Type Ia supernova. Contrary to previous reports, there is little evidence of a circumstellar component in the light echo morphology or in the light curve of the unresolved SN point source. Instead, the obvious and dominant echo contribution comes from what is probably a relatively thin sheet of material some 26 pc in front of SN 2006X. Of the four known Type Ia light echoes, three show no evidence of a circumstellar echo and the fourth needs to be confirmed. We consider other evidence for circumstellar material around SN Ia, which may be rare.

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