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DIRECT CONFIRMATION...
DIRECT CONFIRMATION OF THE ASYMMETRY OF THE CAS A SUPERNOVA WITH LIGHT ECHOES
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Rest, A. (author)
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Foley, R. J. (author)
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Sinnott, B. (author)
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Welch, D. L. (author)
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Badenes, C. (author)
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Filippenko, A. V. (author)
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Bergmann, M. (author)
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Bhatti, W. A. (author)
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Blondin, S. (author)
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Challis, P. (author)
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Damke, G. (author)
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Finley, H. (author)
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Huber, M. E. (author)
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Kasen, D. (author)
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Kirshner, R. P. (author)
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Matheson, T. (author)
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Mazzali, P. (author)
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Minniti, D. (author)
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Nakajima, R. (author)
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Narayan, G. (author)
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Olsen, K. (author)
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- Sauer, Daniel (author)
- Stockholms universitet,Institutionen för astronomi
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Smith, R. C. (author)
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Suntzeff, N. B. (author)
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(creator_code:org_t)
- 2011
- 2011
- English.
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In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 732:1, s. 3-
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We report the first detection of asymmetry in a supernova (SN) photosphere based on SN light echo (LE) spectra of Cas A from the different perspectives of dust concentrations on its LE ellipsoid. New LEs are reported based on difference images, and optical spectra of these LEs are analyzed and compared. After properly accounting for the effects of finite dust-filament extent and inclination, we find one field where the He I lambda 5876 and Ha features are blueshifted by an additional similar to 4000 km s(-1) relative to other spectra and to the spectra of the Type IIb SN 1993J. That same direction does not show any shift relative to other Cas A LE spectra in the Ca II near-infrared triplet feature. We compare the perspectives of the Cas A LE dust concentrations with recent three-dimensional modeling of the SN remnant (SNR) and note that the location having the blueshifted He I and Ha features is roughly in the direction of an Fe-rich outflow and in the opposite direction of the motion of the compact object at the center of the SNR. We conclude that Cas A was an intrinsically asymmetric SN. Future LE spectroscopy of this object, and of other historical SNe, will provide additional insight into the connection of the explosion mechanism to SN then to SNR, as well as give crucial observational evidence regarding how stars explode.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- ISM: individual objects (Cas A)
- ISM: supernova remnants
- supernovae: general
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Rest, A.
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Foley, R. J.
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Sinnott, B.
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Welch, D. L.
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Badenes, C.
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Filippenko, A. V ...
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show more...
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Bergmann, M.
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Bhatti, W. A.
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Blondin, S.
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Challis, P.
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Damke, G.
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Finley, H.
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Huber, M. E.
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Kasen, D.
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Kirshner, R. P.
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Matheson, T.
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Mazzali, P.
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Minniti, D.
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Nakajima, R.
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Narayan, G.
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Olsen, K.
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Sauer, Daniel
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Smith, R. C.
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Suntzeff, N. B.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Astrophysical Jo ...
- By the university
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Stockholm University