Sentences with phrase «formation of an accretion»

So far, it has been assumed that the formation of accretion products from the reaction of two peroxyl radicals is insignificant, which can be traced back to findings from the 60s and 70s.

«Rapid pair production: Detection of a new reaction path in the atmosphere: Research team observes the formation of accretion products during the degradation of hydrocarbons.»

This new image not only confirms the formation of an accretion disk around a very young protostar, but also reveals the vertical structure of the disk for the first time in the earliest phase of star formation.

Not exact matches

The study, «Accretion - induced variability links young stellar objects, white dwarfs, and black holes», which is published in the journal Science Advances, shows how the «flickering» in the visible brightness of young stellar objects (YSOs)-- very young stars in the final stages of formation — is similar to the flickering seen from black holes or white dwarfs as they violently pull matter from their surroundings in a process known as aAccretion - induced variability links young stellar objects, white dwarfs, and black holes», which is published in the journal Science Advances, shows how the «flickering» in the visible brightness of young stellar objects (YSOs)-- very young stars in the final stages of formation — is similar to the flickering seen from black holes or white dwarfs as they violently pull matter from their surroundings in a process known as accretionaccretion.

This liquid - like ice may enhance the formation of organic compounds including prebiotic molecules and the accretion of dust to form planets.

Weiss says that if the solar nebula was around in the first 4 million years of solar system formation, this would give support to the core accretion scenario, which is generally favored among scientists.

The seeming abundance of rocky super-Earths lends support to the core accretion model of planet formation, in which small rocky bodies collide and clump together to grow into these objects.

«This includes theorists studying dark matter and the formation of black holes, astrophysicists modelling the subsequent accretion process, and astronomers working on radio and X-ray observations.»

Indeed, the present - day theory of planet formation — the build up of a rocky planet's core by the accretion of many small bodies — is very different from Jeans's.

Terrestrial planet formation models indicate Earth went through a sequence of major growth phases: accretion of planetesimals and planetary embryos over many tens of millions of years; a giant impact that led to the formation of our Moon; and then the late bombardment, when giant asteroids, dwarfing the one that presumably killed the dinosaurs, periodically hit ancient Earth.

Jets of energy and matter, whose formations remain a mystery, can stretch away from the accretion disk for hundreds of thousands of light - years.

Lagrange says the finding is consistent with a planet formation model known as core accretion in which the planet starts out as a rocky core that gravitationally acquires more matter from the surrounding swarm of dust and gas.

Formation of massive seed black holes via collisions and accretion.

Such «supercritical accretion» is thought to be a possible mechanism in the formation of supermassive black holes at galactic centers in very short time periods (which are observed very early in cosmic time).

In the prevailing theory of planet formation, called core accretion, dust grains stick together to form rocky worlds, and some of these rocky bodies then grow massive enough to attract surrounding gas, becoming gas giants like Jupiter.

Meanwhile, a correlation between the rate at which stars form in the central regions of galaxies and the amount of gas that falls into supermassive black holes (mass accretion rate) was known to exist, leading some scientists to suggest that the activity involved in star formation fuels the growth of black holes.

«Jupiter is the oldest planet of the solar system, and its solid core formed well before the solar nebula gas dissipated, consistent with the core accretion model for giant planet formation.»

For many years, astronomers have been searching for accretion disks in the earliest phase of star formation, in order to determine their structure, how they are formed, and how the accretion process takes place.

Using data collected from the W. M. Keck Observatory, the largest optical telescopes in the world, researchers led by Neil Crighton (MPIA and Swinburne University of Technology) have now made the first unambiguous detection of this accretion of pristine gas onto a star - forming galaxy, that was previously theorized to exist based on cosmological simulations of galaxy formation.

Astronomers went back to the drawing board to put more details into the theory, breaking formation down into quick, single collapses and more gradual accretion of gas disks, and worrying about the effects of orbital migration.

At the presentations of their research results, the two students showed their findings respectively focused on (i) Accretion and rotational movement of gas around a protostar and the formation of a circumstellar disc and (ii) Identification of bipolar jets (mass ejection) from multiple protostars and classification according to the evolutionary phases.

The theory of their formation requires answers to two main questions: 1) how to stop fast planet migration, and 2) how to prevent runaway accretion.

We posit that K2 - 55b may have escaped runaway accretion by migration, late formation, or inefficient core accretion or that K2 - 55b was stripped of its envelope by a late giant impact.

We argue that the correlation between stellar properties and giant planet occurrence is strong supporting evidence of the core accretion model of planet formation.

Due to the lack of sensitivity of past and current infrared (IR) instrumentation, so far it has not been possible to get a glimpse into the earl... ▽ More Our current knowledge of star formation and accretion luminosity at high - redshift (z > 3 - 4), as well as the possible connections between them, relies mostly on observations in the rest - frame ultraviolet (UV), which are strongly affected by dust obscuration.

Abstract: Our current knowledge of star formation and accretion luminosity at high - redshift (z > 3 - 4), as well as the possible connections between them, relies mostly on observations in the rest - frame ultraviolet (UV), which are strongly affected by dust obscuration.

From these discoveries we have refined our theories of planet formation and determined that planets form in stellar accretion disks from leftover star - forming material.

That's why a number of ideas have been proposed recently for speeding up core formation, by efficient accretion of either cm - or mm - sized «pebbles» early on, or small fragments and debris resulting from planetesimal collisions at later stages.

Core accretion relies on the formation of a planetary core — a compact, massive object composed of refractory elements, similar to a terrestrial planet like Earth but typically more massive.

Antioxidants, like glutathione, selenium, zinc, copper, etc will help prevent new oxalate formation and accretion of the stone.

There are... — discontinuity formation (disintegration)-- coalescence (the accretion of previously disassociated objects)-- flock dynamics — physical and perceptual domains

At this point, the buoy indicates sluggish surface melt (0.2 m of ice to date) and 3 cm of bottom melt followed by ice accretion due to under - water ice formation.