Sentences with phrase «in debris disks»

We determine that eccentric planets or stellar companions can induce long - lived eccentric structures in debris disks.

The resulting cycle, called the photoelectric instability (PeI), can work in tandem with other forces to create some of the features astronomers have previously associated with planets in debris disks.

This finding is counterintuitive because higher - mass stars flood their planetary systems with energetic ultraviolet radiation that should destroy the carbon monoxide gas lingering in their debris disks.

«Much like someone doing a cannonball in a swimming pool, the planet drove huge changes in the debris disk once it reached its present orbit.»

In 2009, astronomers confirmed the existence of Beta Pictoris b, a planet with an estimated mass of about nine times Jupiter's, in the debris disk around Beta Pictoris.

Arcs, rings and spirals appear in the debris disk around the star HD 141569A.

«Typically, when astronomers see gaps like this in a debris disk, they suspect that a planet has cleared the path.

Not exact matches

Most likely, Meech says, the object is an outcast from another star system: a space rock flung out during the star's tempestuous youth when it was surrounded by freshly - formed giant planets embedded in a disk of debris.

About 4.6 billion years ago planets like our Earth formed out of the ever - growing clumps of debris that were in the accretion disk around it.

Whether around a young star or a supermassive black hole, the many mutually interacting objects in a self - gravitating debris disk are complicated to describe mathematically.

In actual debris disks, some of these dense clumps could reflect enough light to be directly observable.

«All we need to produce narrow rings and other structures in our models of debris disks is a bit of gas, too little for us to detect today in most actual systems,» said co-author Marc Kuchner, an astrophysicist at NASA's Goddard Space Flight Center in Greenbelt, Md..

Watch the changing dust density and the growth of structure in this simulated debris disk, which extends about 100 times farther from its star than Earth's orbit around the sun.

Rieke notes that our solar system contains a faint debris disk of its own — micrometer - size dust particles slowly spiraling in toward the sun.

And so do the disk of gasses and debris that surrounds it and falls in.

According to researchers, the debris from this collision formed a very wide disk around Mars, made up of a dense inner part composed of matter in fusion, and a very thin outer part primarily of gas.

The gravitational interactions created in the outer disk by this massive star apparently acted as a catalyst for the gathering of debris to form other smaller, more distant moons.

The relatively low speed — between 6 and 7 meters per second — suggests the process must have taken place over thousands or even hundreds of thousands of years before the asteroid was formed, when a gravitationally stable cloud of debris spun in the disk of material that would go on to build the solar system.

«Previous spectroscopic measurements of debris disks revealed that certain ones had an unexpected chemical signature suggesting they had an overabundance of carbon monoxide gas,» said Jesse Lieman - Sifry, lead author on a paper published in Astrophysical Journal.

The astronomers narrowed their search to stars between five and ten million years old — old enough to host full - fledged planetary systems and debris disks — and used ALMA to examine the millimeter - wavelength «glow» from the carbon monoxide in the stars» debris disks.

The discovery that the debris disks around some larger stars retain carbon monoxide longer than their Sun - like counterparts may provide insights into the role this gas plays in the development of planetary systems.

Team leader Mauri Valtonen of the University of Turku in Finland used equations derived from Einstein's theory of general relativity to show that the pulses could be caused by a small, orbiting black hole plunging into the debris disk around the larger one, situated at one end of the orbital ellipse.

In particular, the disk of debris the impact creates was compact, hugging close to the surface.

In the past 2 decades, astronomers have detected infrared radiation from debris disks around several stars.

Other possibilities — such as intrinsic fluctuations in the star's luminosity or even a black hole with a cold and dusty debris disk drifting across our interstellar line of sight — could also still fit the data.

Though long hypothesized, the first evidence for a debris disk around any star was uncovered in 1983 with NASA's Infrared Astronomical Satellite.

In the inner region of the dust disk where Earth formed, the temperature should not have been hot enough to vaporize carbon dust, according to recent observations of circumstellar debris disks around newborn stars.

In 2010 we began a near - infrared (NIR) spectral survey of bright debris disks with reported IRAS excesses and optically resolved disks.

Ongoing radio observations (SMA, JCMT, VLA) of Sirius A are being used to set an observationally determined standard for stellar atmosphere modeling and debris disk studies around A stars, as well as to take the first step toward characterizing potential intrinsic uncertainty in stellar emission at these wavelengths.

According to the simulations, if the moons had formed out of a debris disk thrown out in the aftermath of such a collision, they would be predominantly composed of material that had originated on Mars.

My research is in celestial mechanics, including the architecture of extra-solar planetary systems, debris disks around stars, the Kuiper belt and asteroid belt, orbital resonances, and meteoritic bombardment on planets in the solar system.

Debris disks contain the solid remnants of planet formation that are in collisional cascade, with particles ranging from kilometre - sized planetesimals down to micron - sized dust grains.

In particular, I will focus on planets on eccentric orbits, not only because typical exoplanetary systems have been found to contain these, but also because their interactions with debris disks theoretically facilitates the transport of icy bodies within the habitable zone of planetary systems.

Within the 97 - AU - radius debris disk, the discovery team believes that planets less massive than Jupiter could orbit undetected in outer orbits.

This talk will focus on our new discoveries with VLT / SPHERE of a beautiful two - armed spiral disk with a large gap (the third known of its kind) and an edge - on warped debris disk — similar to the warp induced by the planet in Beta Pic.

(4) Does the «typical» circumstellar disk states of primary star + Kuiper Belt Star show evidence for material from each of the different kinds of small outer solar system bodies (Comets, Centaurs, KBOs) like the active comet debris in HR4796A and the icy KBO debris in Fomalhaut and HD 32297?

Even though the group did not detect any additional exoplanets in the 30 previous unobserved systems, the observations they made provided supplementary data that helped to characterize the abundance of planets in systems with debris disks.

When researchers observed star systems containing debris disks with giant exoplanets in distant orbits, they noted that the star systems had similar dual dust disks analogous to the Solar System's two zones — the asteroid belt (between Mars and Jupiter) and the Kuiper Belt (beyond the orbit of Neptune).

Many planets that have been found through direct imaging have been in systems that had debris disks, and now we know the dust could be indicators of undiscovered worlds.»

Most galaxies in the observable universe contain a supermassive black hole at their center, one that is either active and surrounded by an accretion disk of dust, gas and other debris, or is dormant — lurking at the center, patiently awaiting its next meal.

There has been no shortage of proposed explanations that have been put forth in order to account for the unusual observations, from the more mundane ones which include the presence of cometary fragments and large disk of debris from planetary collisions within the star system, to the more imaginative and fascinating ones which have invoked the presence of an extraterrestrial super-civilisation that is in the process of constructing gigantic megastructures around the star itself.

The finding ends a decade of scientific speculation that an odd warp in the young star's debris disk may actually be another inclined disk.

The problem with this interpretation was that such collision events would create large debris disks which would glow brightly in the infrared, yet previous searches with NASA's Wide - field Infrared Survey Explorer, or WISE, had found no such excess infrared emission from KIC 8462852.

The finding ends a decade of speculation that an odd warp in the young star's debris disk may actually be another inclined disk.

Kalas and his team first used Hubble to photograph Fomalhaut in 2004, and made the unexpected discovery of its debris disk, which scatters Fomalhaut's starlight.

Given that Tau Ceti does not appear to be a young star, the ring of dusty debris is believed to be produced by collisions between larger comets and asteroids that break them down into smaller and smaller pieces, and Tau Ceti's disk is similar in size and shape to the disk of comets and asteroids that orbits the Sun, Sol.

According to Akeson et al (2009), Denebola was first identified as having an circumstellar dust or «debris» disk from an excess of infrared radiation observed with the Infrared Astronomical Satellite (IRAS) in 1983 (Aumann and Probst, 1991, see G448.0, GL 448, or BS 4534).

So that means the white dwarf in this system probably came from a star slightly more massive than the A star that has the debris disk, maybe a B type star.

A new mechanism to produce the dust in the presented debris disks, deviations from the conditions required for a standard equilibrium collisional cascade (grain size exponent of -3.5), and / or significantly different dust properties would be necessary to explain the potentially steep SED shape of the three debris disks presented.

Beta Pictoris remains the only directly imaged debris disk that has a giant planet (discovered in 2009).