A Light Echo from Type Ia SN 1995E? | Zendy

J. Quinn | Zendy; P. Garnavich | Zendy; Weidong Li | Zendy; N. Panagia | Zendy; Adam G. Riess | Zendy; B. Schmidt | Zendy; M. Della Valle | Zendy

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A Light Echo from Type Ia SN 1995E?

Author(s) -

J. Quinn,

P. Garnavich,

Weidong Li,

N. Panagia,

Adam G. Riess,

B. Schmidt,

M. Della Valle

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/507826

Subject(s) - supernova , physics , astrophysics , photometry (optics) , galaxy , echo (communications protocol) , astronomy , hubble space telescope , type (biology) , stars , biology , computer network , ecology , computer science

We identify a light echo candidate from Hubble Space Telescope (HST) imagingof NGC 2441, the host galaxy of the Type Ia supernova 1995E. From the echo'sangular size and the estimated distance to the host galaxy, we find a distanceof 207 +/- 35 pc between the dust and the site of the supernova. If confirmed,this echo brings the total number of observed non-historical Type Ia lightechoes to three -- the others being SN 1991T and SN 1998bu -- suggesting theyare not uncommon. We compare the properties of the known Type Ia supernovaechoes and test models of light echoes developed by Patat et al. (2005). HSTphotometry of the SN 1991T echo shows a fading which is consistent withscattering by dust distributed in a sphere or shell around the supernova. Lightechoes have the potential to answer questions about the progenitors of Type Iasupernovae and more effort should be made for their detection given theimportance of Type Ia supernovae to measurements of dark energy.Comment: 19 pages, 4 postscript figures, 3 tables, accepted for publication in the Ap

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