World Library  
Flag as Inappropriate
Email this Article

SN 2003fg

Article Id: WHEBN0007103913
Reproduction Date:

Title: SN 2003fg  
Author: World Heritage Encyclopedia
Language: English
Subject: History of supernova observation, Supernovae, Index of physics articles (S), Vela Supernova Remnant, List of supernova remnants
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

SN 2003fg

SN 2003fg
Observation data (Epoch J2000.0)
Supernova type aberrant Ia
Right ascension 14h 16m 18.78s
Declination +52° 14' 55.4
Galactic coordinates 096.3812 +60.2821
Discovery date 2003
Physical characteristics
Notable features Super Chandrasekhar

SN 2003fg, sometimes called the "Champagne Supernova", was an unusual Type Ia supernova. It was discovered in 2003 with the Canada-France-Hawaii Telescope and the Keck Telescope, both on Mauna Kea in Hawaii, and announced by researchers at the University of Toronto.[1] The supernova occurred in a galaxy some 4 billion light-years from Earth. It was nicknamed after the 1996 song "Champagne Supernova" by English rock band Oasis.[2]

It was unusual because of the mass of its progenitor. According to the current understanding, white dwarf stars explode as Type Ia supernovas when their mass approaches 1.4 solar masses, termed the Chandrasekhar limit. The mass added to the star is believed to be donated by a companion star, either from the companion's stellar wind or the overflow of its Roche lobe as it evolves.[3]

However, the progenitor of SN 2003fg reached two solar masses before exploding. The primary mechanism invoked to explain how a white dwarf can exceed the Chandrasekhar mass is unusually rapid rotation; the added support effectively increases the critical mass. An alternative explanation is that the explosion resulted from the merger of two white dwarfs. The evidence indicating a higher than normal mass comes from the light curve and spectra of the supernova—while it was particularly overluminous, the kinetic energies measured from the spectra appeared smaller than usual. One proposed explanation is that more of the total kinetic energy budget was expended climbing out of the deeper than usual potential well.[4]

This is important because the brightness of type Ia supernovae was thought to be essentially uniform, making them useful "standard candles" in measuring distances in the universe. Such an aberrant type Ia supernova could throw distances and other scientific work into doubt; however, the light curve characteristics of SN 2003fg were such that it would never have been mistaken for an ordinary high-redshift Type Ia supernova.

References

  1. ^ Howell, D. Andrew (21 September 2006). "The type Ia supernova SNLS-03D3bb from a super-Chandrasekhar-mass white dwarf star".  
  2. ^ Branch, David (21 September 2006). "Astronomy: Champagne supernova".  
  3. ^ Nugent, Peter (September 20, 2006). "The Weirdest Type Ia Supernova Yet". Research News. Retrieved 2006-11-02. 
  4. ^ McKee, Maggie (20 September 2006). "Bizarre supernova breaks all the rules".  

External links

  • SN 2003fg - SIMBAD
  • 'Champagne supernova' challenges understanding of how supernovae work - University of Toronto
  • "Rebellious supernova confronts dark energy"Cosmos Magazine -
  • 'Champagne Supernova' breaks astronomical rules - CBC
  • NatureAstronomy: Champagne supernova - (subscription site)
  • Supernovae - NASA GSFC
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.