Circles on the Sky: Confirmation of a Light Echo from the Type Ia Supernova 1995E

Details Circles on the Sky: Confirmation of a Light Echo from the Type Ia Supernova 1995E Circles on the Sky: Confirmation of a Light Echo from the Type Ia Supernova 1995E

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915002g&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #150.02; Bulletin of the American Astronomical Society,

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Scientific paper

We show that the resolved source coincident with the position of SN 1995E in NGC 2441 is an expanding light echo. This is only the third confirmed light echo from a well-observed type Ia supernova, the others being SN 1991T and SN 1998bu. The echo candidate was first identified from a 2001 Hubble Space Telescope (HST) "snap-shot" survey of fields containing type Ia events (Quinn et al.). Follow-up HST/ACS images obtained in September 2006 reveal that the source is now a small ring and its size has increased by about 30% over the 2001 STIS image. This is expected for light scattering off a dust sheet 200 pc in front of the supernova. We analyze the echo color to constrain the properties of dust in NGC 2441.
This work is partially supported by NASA grant HST-GO-10892.

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