type Ia supernova


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type Ia supernova

[‚tīp ‚wən‚ā ‚sü·pər′nō·və]
(astronomy)
A member of a subclass of the type I supernovae that brighten relatively smoothly to a maximum whose brightness is relatively uniform among members of the subclass about 2 weeks after the explosion; decline in brightness quasi-exponentially thereafter; show strong lines of silicon, sulfur, calcium, and iron in their peak spectra; have late-time spectra dominated by strong emission lines of iron and cobalt; have line widths that imply velocities from 4000 to 12,000 miles (7000 to 20,000 kilometers) per second, with the highest velocities seen early on; and are believed to be exploding white dwarf stars.
References in periodicals archive ?
In 2011 astronomers observed the explosion of a Type Ia supernova in the galaxy (not visible in this image).
SN 2014J is classified as a Type Ia supernova and is the closest such blast in at least four decades.
A white dwarf star exploded as a Type Ia supernova over 11 million years ago and a shell of light from it is expanding and sweeping through interstellar space, NASA's Hubble Space Telescope has found.
Among the topics are precision observational asteroseismology using Kepler spacecraft data, updates on the pulsating sdB star Feige 48 through spectroscopy, glimpses into the secret lives of hot subdwarf stars, tidally enhanced stellar wind in binaries as a second parameter for the horizontal branch morphology of globular clusters, hot subdwarf stars as the donors of type Ia supernova progenitors, and a radial velocity survey of hot subdwarfs with main sequence companions using the Hobby-Eberly telescope.
Astronomers are now discovering about 1,000 per year, and Type Ia supernova observations are now calibrated to build the extragalactic distance scale.
Type Ia Supernova Rates in Intermediate Redshift Galaxy Clusters
4 solar masses then this will overcome the degeneracy pressure, ignite the mainly carbon and oxygen core explosively and bring about the complete destruction of the star as a Type Ia supernova (Figure 21).
TEHRAN (FNA)- Astronomers have detected for the first time multiple images from a gravitationally lensed Type Ia supernova.
4 solar masses this way, the star's entire bulk explodes in a carbon-fusion reaction as a Type Ia supernova.
This factor leads to an explanation of type Ia supernova measurements without dark energy.
When one star - specifically a white dwarf - from a binary system explodes, it is called a Type Ia supernova and is used by astronomers to measure the rate of the universe's expansion.
Combining this observation with another chance observation by a Japanese amateur astronomer, Filippenko's team was able to calculate that SN 2014J had unusual characteristics-it brightened faster than expected for a Type Ia supernova and, even more intriguing, it exhibited the same unexpected, rapid brightening as another supernova that KAIT discovered and imaged last year-SN 2013dy.