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An Echo of Supernova 2008bk

Van Dyk, Schuyler D. (2013) An Echo of Supernova 2008bk. Astronomical Journal, 146 (2). Art. No. 24. ISSN 0004-6256. doi:10.1088/0004-6256/146/2/24.

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I have discovered a prominent light echo around the low-luminosity Type II-plateau supernova (SN) 2008bk in NGC 7793, seen in archival images obtained with the Wide Field Channel of the Advanced Camera for Surveys on board the Hubble Space Telescope (HST). The echo is a partial ring, brighter to the north and east than to the south and west. The analysis of the echo I present suggests that it is due to the SN light pulse scattered by a sheet, or sheets, of dust located ≈15 pc from the SN. The composition of the dust is assumed to be of standard Galactic diffuse interstellar grains. The visual extinction of the dust responsible for the echo is A_V ≈0.05 mag in addition to the extinction due to the Galactic foreground toward the host galaxy. That the SN experienced much less overall extinction implies that it is seen through a less dense portion of the interstellar medium in its environment. The late-time HST photometry of SN 2008bk also clearly demonstrates that the progenitor star has vanished.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper DOIArticle
Van Dyk, Schuyler D.0000-0001-9038-9950
Additional Information:© 2013 The American Astronomical Society. Received 2012 December 7; accepted 2013 May 28; published 2013 June 27. Based in part on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute (STScI), which is operated by AURA, Inc., under NASA contract NAS5-26555. I appreciate the careful review by the referee and am grateful for the helpful comments provided that improved this paper. I am also grateful to Giuliano Pignata for providing preliminary early-time photometry of the SN at I band. This work was based in part on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS 05-26555. It was also based in part on data obtained from the ESO Science Archive Facility under request numbers 8354, 31942, and 31948.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NASANAS 05-26555
Subject Keywords:dust, extinction; galaxies: individual (NGC 7793); scattering; supernovae: general; supernovae: individual (SN 2008bk)
Issue or Number:2
Record Number:CaltechAUTHORS:20130909-091840445
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Official Citation:An Echo of Supernova 2008bk Schuyler D. Van Dyk 2013 The Astronomical Journal 146 24
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41162
Deposited By: Tony Diaz
Deposited On:17 Sep 2013 23:29
Last Modified:10 Nov 2021 04:26

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