Sentences with phrase «type ia»
The paradox of the carnitine palmitoyltransferase type Ia P479L variant in Canadian Aboriginal populations.
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In contrast to Type - Ia supernovae, Type Ib and Type Ic do not exhibit silicon lines and are even less understood than Type Ia.
Over the course of the three years, the SDSS Supernova Survey discovered and measured multi-band lightcurves for about 500 spectroscopically confirmed Type Ia supernovae in the redshift range z = 0.05 - 0.4.
If the white dwarf accretes enough material to reach the Chandrasekhar limit, the maximum mass of a stable white dwarf star (1.4 solar mass), it will likely explode as a Type Ia supernova.
By comparing the observed brightness of both types of stars in those nearby galaxies, the astronomers could then accurately measure their true brightness and therefore calculate distances to roughly 300 Type Ia supernovae in far - flung galaxies.
More supernova research with Kepler will help astronomers on a quest to find out if different type Ia mechanisms result in some supernovae being brighter than others — which would throw a wrench into how they are used to measure the universe's expansion.
The first kind, called «type Ia» (pronounced as «one a») is special because the intrinsic brightness of each of these supernovae is almost the same.
But as astronomers find more and more examples of type Ia explosions, including with Kepler, they realize not all are created equal.
Type Ia supernovae may have chemically enriched the first massive galaxies within one billion years of the Big Bang (more from APOD, ESA, and Freudling et al, 2003).
In contrast to Type - Ia supernovae such as Tycho's Star and Supernova 1997ff, Types Ib and Ic do not exhibit a silicon line and are even less understood than Type Ia.
In 2003, astronomers announced that they had discovered that iron from supernovae of the first stars (possibly from Type Ia supernovae involving white dwarfs) indicate that «massive chemically enriched galaxies formed» within one billion years after the Big Bang, and so the first stars may have preceded the birth of supermassive black holes (more from Astronomy Picture of the Day, ESA, and Freudling et al, 2003).
They applied a new technique that could have implications for understanding other Type Ia supernovae, a class of stellar explosions that scientists use to determine the expansion rate of the universe.
In practice there is a range of luminosities for the Type Ia, but the luminosity can be derived from the rate at which the supernova brightens and then fades — the more luminous ones take longer to brighten and then fade.
Artist's impression of a white dwarf exploding in a Type Ia supernova.
GSD Type Ia (GSD1a) is the most common genetically inherited glycogen storage disease.
Type Ia supernovae are fairly rare in the nearby Universe and represent the explosion of at least one white dwarf star in a binary system.
In any case, LP40 - 365 is the first known white dwarf to have survived a (failed) Type Ia supernova, and as such it opens up some exciting prospects for future science.
Astronomers have discovered evidence that could help solve a long standing dispute over the origin of Type Ia supernovae, by observing the youngest example of the titanic explosions located to date.
Thus, US 708 could have originally resided in an ultra compact binary system, transferring helium to a massive white dwarf companion, ultimately triggering a thermonuclear explosion of a type Ia supernova.
late stages of stellar evolution: white dwarfs, isolated and in interacting binary systems, stellar explosions on white dwarfs (novae and type Ia supernovae).
In the 1980s astronomers began to use Type Ia supernovae as standard candles.
Type Ia supernovas that exploded when the universe was only two - thirds of its present size were fainter and thus farther away than they would be in a universe without dark energy.
One technique for measuring the expansion rate is to observe the apparent brightness of objects of known luminosity like Type Ia supernovas.
SDSS measured spectra of more than 930,000 galaxies and 120,000 quasars as well as mapping the structure of the Milky Way by taking spectra of 240,000 stars and finding Type Ia supernovae to help us measure the history of the expansion of the universe.
Supergiant luminosities are not as well known or uniform as the Type Ia supernovae, so astronomers prefer to use the Type Ia supernovae to derive the distances to the very distant galaxies.
In the 1980s, as observational technology improved, scientists further divided Type I supernovae into three subcategories: Type Ia (which contain silicon in their spectra), Type Ib (which contain helium) and Type Ic (which contain neither)[source: Swisburne University of Technology].
«We needed both the nearby Cepheid distances for galaxies hosting Type Ia supernovae and the distances to the 300 more - distant Type Ia supernovae to determine the Hubble constant,» Filippenko said.
This allowed them to improve the accuracy of the derived distances of these galaxies, and thus to more accurately calibrate the peak luminosities of their Type Ia supernovae.
Type Ia supernovae work differently than all other types.
Type Ia supernovas are known to form when a white dwarf merges with another star, like a puffed - up red giant (as opposed to Type II supernovas, which form when a single star dies and collapses on itself).
«Until now, the formation of supernovae Type Ia by the merging of two white dwarfs was purely theoretical,» said David Jones, one of the paper's coauthors who was an ESO Fellow at the time the data were obtained.
A Type Ia supernova results from a white dwarf that's part of a binary system (that is, one that shares an orbit with another star) and was about twice the size of our sun during its life.
Type Ia supernovae, another commonly used cosmic yardstick, are exploding stars that flare with the same intrinsic brightness and are brilliant enough to be seen from much longer distances.
And by using Type Ia supernovae as standard candles, researchers have been able to map entire galaxies» distances from us and determine that the universe is expanding ever more rapidly [source: Cal Tech].
By measuring about 2,400 Cepheid stars in 19 nearby galaxies and comparing the apparent brightness of both types of stars, they accurately determined the true brightness of the Type Ia supernovae.
The mass of the merged star will be enough to create a thermonuclear explosion, creating a type Ia supernova, the researchers said.
«It will have important repercussions for the study of supernovae type Ia.»
All Type Ia supernovas are thought to burn with equal brightness, making them so - called «standard candles.»
They then used this calibration to calculate distances to roughly 300 Type Ia supernovae in far - flung galaxies.
It's so consistent that Type Ia supernovae are also called standard candles: Once astronomers find one in a region of space, they can use it as a baseline with which to compare other objects around it.
The blue «X» denotes the location of supernova 2003du, a Type Ia supernova.
Type Ia supernovae completely destroy the core of a star, but the other three types leave a super-dense core behind.
The stars are gradually drawing closer to each other and are expected to merge in about 700 million years, creating a Type Ia supernova
April 23, 2018 Ultragenyx Announces Filing and FDA Clearance of an Investigational New Drug Application for DTX401, a Gene Therapy for the Treatment of Glycogen Storage Disease Type Ia
Astronomers thought that all Type Ia supernovas shine with the same brightness, making them incredibly useful cosmic yardsticks.
Saul Perlmutter, Brian Schmidt and Adam Reiss share the 2011 Nobel Prize in Physics for their observations that type Ia supernovae indicate that the expansion of the universe is accelerating.
«We think most of the iron came from a single type of supernovae, called Type Ia supernovae,» said former KIPAC member and co-author Aurora Simionescu, who is currently with the Japanese Aerospace Exploration Agency as an International Top Young Fellow.
The researchers believe that at least 40 billion Type Ia supernovae must have exploded within a relatively short period on cosmological time scales in order to release that much iron and have the force to drive it out of the galaxies.
The discovery of a surviving companion would put an end to the ongoing discussion about the origin of type Ia supernova.
«The evidence has been building for years that the classical paradigm, the single - degenerate scenario, is not enough to explain every type Ia that we see,» Howell says.