Sentences with phrase «of white dwarf»

In that case, the intense gravity of the white dwarf can steal material from its neighbor.

Novae, which are significantly less luminous than supernovae, are cataclysmic nuclear explosions that occur on the surface of a white dwarf in a binary system.

They suggested this could be the result of a white dwarf that has a helium layer on its surface.

The diminished star also has a partner star, which may cause objects from the belt to move in the direction of the white dwarf.

The speed at which US 708 is departing the Milky Way would depend on the mass of the white dwarf that exploded.

This animation shows the explosion of a white dwarf, an extremely dense remnant of a star that can no longer burn nuclear fuel at its core.

One possible reason for why these objects are rare is that the birth of a white dwarf is somewhat violent.

Specifically, the inferred presence of calcium - carbonate came from examining the atomic leftovers of the planet accretion event in the atmosphere of the white dwarf star — after the presumed dust from the planet's demolished surface was consumed by the white dwarf.

«Spectroscopic observations of the white dwarf allowed us to measure the abundances of the rocky material as it is being accreted and filtered through the star's atmosphere in real time,» Melis said.

Building on past observations of the white dwarf called SDSSJ1043 +0855 (the dead core of a star that originally was a few times the mass of the Sun), which has been known to be gobbling up rocky material in its orbit for almost a decade, the team used Keck Observatory's HIRES instrument fitted to the 10 - meter Keck I telescope as well as data from the Hubble Space Telescope to measure and characterize the material being accreted by the star.

The letters are not related to the letters used in the classification of other stars, but instead indicate the composition of the white dwarf's visible outer layer or atmosphere.

A teaspoon of white dwarf material would weigh about 15 tons.

Artist's impression of a white dwarf exploding in a Type Ia supernova.

Credit: NASA, ESA and P. Ruiz - Lapuente, cut and coloured by S. Geier Animation of a white dwarf accumulating matter and the resulting supernova that ejected US708 at high velocity.

The energy output of a white dwarf is so small that the object can go on shining mainly by radiating away its stored energy until virtually none is left to emit.

When the mass of the remnant core lies between 1.4 and about 2 solar masses, it apparently becomes a neutron star with a density more than a million times greater than even that of a white dwarf.

A binary star system (consisting of a white dwarf and a companion star) that rapidly brightens, then slowly fades back to normal.

Artist impression of a rocky and water - rich asteroid being torn apart by the strong gravity of the white dwarf star GD 61.

Today, a UCLA - led team of scientists reports that it has discovered the existence of a white dwarf star whose atmosphere is rich in carbon and nitrogen, as well as in oxygen and hydrogen, the components of water.

By calculating the number of these elements relative to oxygen, the researchers were able to predict how much oxygen should be in the atmosphere of the white dwarf — but they found significantly more oxygen than if there were only rocks.

But thanks to a key prediction in general relativity, we have directly measured the mass of a white dwarf for the first time.

They hypothesized this object could be the result of a white dwarf with a helium layer on its surface.

According to this model, the violent wind that creates a planetary nebula is also the engine that transforms a bloated red giant into the burnt - out cinder of a white dwarf, a metamorphosis common to all stars of low and intermediate mass — stars up to eight times more massive than the sun.

The team believes that the explosion of a white dwarf partner propelled US 708 on its intergalactic escape route (as depicted in the simulation above).

Observations of the explosions of white dwarf stars in binary systems, so - called Type Ia supernovae, in the 1990s then led scientists to the conclusion that a third component, dark energy, made up 68 % of the cosmos, and is responsible for driving an acceleration in the expansion of the universe.

Neither study searched for the stars responsible for so - called type Ia supernovae, which are explosions of white dwarf stars that have grown overweight by feasting on material from a companion star.

How such a dense planet formed is unclear, the researchers say, but it's probably the crystalline vestige of a white dwarf star whose atmosphere was stripped away by the parent pulsar.

Published in Nature Astronomy and funded by the Science and Technology Facilities Council and the European Research Council, the study finds the remains of shattered asteroids orbiting a double sun consisting of a white dwarf and a brown dwarf roughly 1000 light - years away in a system called SDSS 1557.

The first hint of the kamikaze asteroids came about 40 years ago, when astronomers discovered heavy elements such as magnesium in the spectra of some white dwarf stars.

When Sigurdsson and colleagues analyzed images of the white dwarf from the Hubble Space Telescope, they concluded that the distant, unseen companion is not a low - mass star, as many researchers had thought, but a planet with about 2.5 times the mass of Jupiter.

Type Ia supernovae are caused by the complete destruction of a white dwarf star in a thermonuclear explosion.

If that interpretation is correct, part of the white dwarf should survive as a leftover object.

Type Iax supernovae may be caused by the partial destruction of a white dwarf star in such an explosion.

Artist's impression of a rocky and water - rich asteroid being torn apart by the strong gravity of the white dwarf star.

In observations obtained at the William Herschel Telescope in the Canary Islands, the University of Warwick astronomers detected a large quantity of hydrogen and oxygen in the atmosphere of a white dwarf (known as SDSS J1242 +5226).

Known as 2014J, this was a Type la supernova caused by the explosion of a white dwarf star, the inner core of star once it has run out of nuclear fuel and ejected its outer layers.

A type Ia supernova represents the total destruction of a white dwarf star by one of two possible scenarios.

A planetlike body 4,000 light - years away may be the compacted remains of a white dwarf star that is now mostly diamond.

And that pressure, acting on the carbon - rich makeup of the white dwarf, may have crystallized much of it to the particular form of carbon we call diamond.

The researchers use the light of white dwarf stars observed with the Hubble Space Telescope.

If enough material, mostly in the form of hydrogen gas, accumulates on the surface of the white dwarf, nuclear fusion reactions can occur and intensify, culminating into a cosmic - sized hydrogen bomb blast.

A kilonova is about 1,000 times brighter than a nova, which is caused by the eruption of a white dwarf.

The measurement is the distance to SS Cygni, a star system consisting of a white dwarf plus a companion.

This will be about the size of the Earth, but much heavier: one tea spoon of white dwarf material weighs about 5 tons.»

A nova can occur if the strong gravity of a white dwarf pulls material from its orbiting companion star.

Since all type Ia supernovas are the result of a white dwarf breaching that critical tipping point, astronomers assumed they'd always produce an extremely similar blast.

The blast from one of the Milky Way supernovas, which Rest has seen from different angles, looks symmetric, suggesting it was the result of a white dwarf stealing from its companion until it exploded — a typical type Ia.

Imagine being able to view microscopic aspects of a classical nova, a massive stellar explosion on the surface of a white dwarf star (about as big as Earth), in a laboratory rather than from afar via a telescope.

Whilst similar to the formation of Saturn's rings, the scale of the white dwarf and its debris is many times greater in size.

WHAT LIES WITHIN The inner structure of a white dwarf star (shown in this artist's impression) has been mapped for the first time — and it's more oxygen - rich than expected.