While all stars eventually die, those that
result in supernovae eventually are recycled and used to create new stars and planets.
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.
Not exact matches
The
results of two studies of recent gamma - ray bursts, published today
in the journal Science, indicate that exploding stars called
supernovae may spawn some of these blasts.
Researchers used
supernovas, cosmic microwave background radiation and patterns of galaxy clusters to measure the Hubble constant — the rate at which the universe expands — but their
results were mismatched, Emily Conover reported
in «Debate persists on cosmic expansion» (SN: 8/6/16, p. 10).
The
results resolve some of the questions regarding the
supernova - GRB connection, but it remains unclear how a single mechanism can produce
supernovae and the much more powerful GRBs
in the distant universe.
The Hubble Space Telescope's recent discovery of the earliest known Type Ia
supernova from more than 10 billion years ago, plus other
results, favor a scenario
in which two white dwarfs merge.
GHOST
IN THE SHELL What looked like an ordinary supernova, shown in this artist's illustration, might be the result of a single star exploding at least three times, blowing off expanding shells of gas each tim
IN THE SHELL What looked like an ordinary
supernova, shown
in this artist's illustration, might be the result of a single star exploding at least three times, blowing off expanding shells of gas each tim
in this artist's illustration, might be the
result of a single star exploding at least three times, blowing off expanding shells of gas each time.
Kersten and Smirnov, however, show that this decoherence effect does not have any impact on the experimental measurement of the oscillation probability for each neutrino flavour; they only demonstrate this
result in cases that are similar to, albeit simpler, than what happens
in a
supernova, where collective effects occur.
Studies using type 1a
supernovas as «standard candles» to measure how fast the universe expands (the Hubble constant) produce a
result in conflict with other data used to infer the cosmic growth rate.
In the Feb. 18 SN: Anniversary of a celebrity supernova, readying for the next stellar explosion, human - animal chimeras, hottest year on record, molecules tied in knots, cancer results don't reproduce and mor
In the Feb. 18 SN: Anniversary of a celebrity
supernova, readying for the next stellar explosion, human - animal chimeras, hottest year on record, molecules tied
in knots, cancer results don't reproduce and mor
in knots, cancer
results don't reproduce and more.
They are abundantly produced
in supernova explosions, star - powering nuclear fusion and other nuclear processes,
resulting in trillions of neutrinos passing through us every minute.
The
results, presented April 15 at a conference
in Geneva, may force scientists to rethink theories that focus on
supernovas as the producers of these speedy particles.
The astronomers, who published their
results in The Astrophysical Journal, hope such observations will help them understand
supernovae, which are important because the blasts are thought to create heavy elements such as silver, nickel, and copper.
When a low - energy neutrino or antineutrino from a
supernova collides with a water molecule
in the tank, the
resulting light signal is recorded by about 100 of 13,000 photomultipliers, ultrasensitive light - detecting devices that turn a tiny flash of light into a larger recordable burst of electricity.
When it comes time for one to end it all
in a
supernova, there isn't as much matter left to collapse
in on itself,
resulting in a lower - mass black hole.
And gamma - ray bursts — thought to
result from especially powerful
supernovas or stellar collisions — are so rare that the researchers calculated that, over a billion years, there's only about a 1
in 3 billion chance of one killing off tardigrades.
Kirby's team observed Segue 2 with the Keck telescope
in Hawaii and found that it has the chemical composition of a galaxy that has hosted several
supernovae and kept hold of the
resulting debris (The Astrophysical Journal, doi.org/mtq).
«Some stars get the boot when their companion star explodes
in a
supernova, and others can get kicked out of crowded star clusters,» says William Chick, a UW doctoral student
in physics, who presented his team's new
results Jan. 5 at the 227th American Astronomical Society meeting
in Kissimmee, Fla. «The gravitational boost increases a star's speed relative to other stars.»
The property
results from the way they form: When a giant star runs out of fuel and can no longer fight against the crushing force of its gravity, its core shrinks to the size of an asteroid, and most of its mass is blasted away
in a titanic explosion called a
supernova.
The team will repeatedly bombard the target with the same type of ion to build a picture of the different energy levels
in the
resulting atoms, helping to predict the stabilities of the exotic forms made
in supernovae.
The team also succeeded
in explaining, with a theoretical model, that the actual changes (balance of inflow and outflow)
in gas levels they observed were the
result of the increasing amount of gas falling into the supermassive black holes within the gas disks enhanced by strong turbulence generated by
supernova explosions (an activity associated with star formation) when a star inside the dense gas disks dies.
According to Kool the
results coming from SUNBIRD reveal that their new approach provides a powerful tool for uncovering core - collapse
supernova in nuclear regions of galaxies.
We present the first
results of project SUNBIRD (
Supernovae UNmasked By InfraRed Detection), where we aim to uncover CCSNe that otherwise would remain hidden
in the complex nuclear regions of LIRGs, and
in this way improve the constraints on the fraction that is missed by optical seeing - limited surveys.
In this, the first
results of the SUNBIRD project, the team discovered three core - collapse
supernovae, and one possible
supernova that could not be confirmed with subsequent imaging.
This animation illustrates how the powerful gravity of a massive galaxy cluster bends and focuses the light from a
supernova behind it,
resulting in multiple images of the exploding star.
The explosive (or eruptive) variables include novas,
supernovas, and similar stars that undergo sudden outbursts of radiant energy, which
results in rapid brightening.
The top candidates, the astronomers suggested, are a neutron star, possibly a highly - magnetic magnetar, surrounded by either material ejected by a
supernova explosion or material ejected by a
resulting pulsar, or an active nucleus
in the galaxy, with radio emission coming from jets of material emitted from the region surrounding a supermassive black hole.
Observing the spiral galaxy M100, Kieron studied a
supernova in the galaxy, and his
results can be seen
in the coursework here.
This
result is important
in that it confirms the presence of dark energy independently from the observation of
supernovae.»
A caution is that this method using
supernovae is built on several assumptions, and therefore independent checks of the
result are important
in order to draw any robust conclusion.
In 1985, Bolton and his colleague Douglas R. Gies demonstrated that not all «ejected» OB stars (runaway stars that travel at very high speeds through open space) are the
result of the
supernova explosion of a companion star.
The destructive
results of a mighty
supernova explosion reveal themselves
in a delicate blend of infrared and X-ray l...
For many years, astronomers have known two types - «supermassive» black holes at the centers of large galaxies and the so - called «stellar - mass» black holes that
result when a star about 10 times the Sun's mass ends its life
in a
supernova explosion.
Some of the new
results included deeper understandings of galaxies
in the distant universe, more complete pictures of the massive galaxy clusters, and the searches for exploding massive stars, called
supernovae.
Just as
in the large
supernovae (hypernovae) cases, however, the end
result is the formation of a single black hole surrounded by a disk.
type 1a
supernova A
supernova that
results from some binary (paired) star systems
in which a white dwarf star gains matter from a companion.
Most of the energy from the
supernova turns into light when it hits this previously ejected material,
resulting in a short, but brilliant burst of radiation.
The Crab Nebula, the
result of a bright
supernova explosion seen by Chinese and other astronomers
in the year 1054, is some 6,500 light - years from Earth.
So the scientists set out to test two main theories: whether the
supernova was caused
in part by two narrow jets of material streaming out of either end of a rotating star, or whether it was the
result of stuff «sloshing» around inside, leaving behind a lumpy shape.