Sentences with phrase «orbiting brown dwarfs»

We don't know how you would form these things,» she said, referring to planets orbiting brown dwarfs.

It seems extremely clear however that the timescale of habitable - zone migration is so gradual as to be not relevant to the other reason habitable objects orbiting brown dwarfs are interesting, and that is the prospect of our own use of them.

Other photographed objects have been too massive to be conclusively labeled planets, falling instead into the brown dwarf category (objects about eight to 80 Jupiters in size that lack sufficient mass to ignite hydrogen fusion in their cores, thereby never becoming true stars); have been found to themselves orbit brown dwarfs rather than stars; or have not been shown to be gravitationally bound to a star.

The Hubble Space Telescope directly observed changes in brightness of the «super-Jupiter» orbiting a brown dwarf, the results of which were published Thursday.

Not exact matches

Brown dwarfs are not quite massive enough to shine like stars, but nor are they planets because they don't usually orbit stars.

Caltech astronomer Davy Kirkpatrick, who works on related research, says that brown dwarfs like this one seem to have compositions similar to those of the giant planets detected orbiting faraway stars.

Dozens of brown dwarfs have been discovered orbiting normal stars.

Brown dwarfs that orbit close to their parent stars run the risk of being swallowed whole.

At the same meeting, astronomer Thomas Beatty of Ohio State University, Columbus, announced the discovery of just such a system with the small KELT telescope in Arizona: a brown dwarf 27 times as massive as Jupiter, orbiting its hot parent star every 30 hours.

But astronomers have always wondered about the paucity of close - in brown dwarfs: While many giant planets have been found in small orbits, whirling around their sunlike stars in just a few days, the more massive brown dwarfs appear to shun these intimate relationships.

Indeed, the few close - in brown dwarfs that have been found orbit stars that are hotter and more massive than our sun, and spin faster.

At the meeting, he argued that brown dwarfs in tight orbits get devoured by their sunlike parent stars.

The reason: If a brown dwarf orbits close to its star, both objects raise tides, just as the moon raises tides on Earth.

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.

«In 2007, we began our long - term search for gas giant planets and brown dwarfs orbiting nearby low mass dwarf stars,» said Boss.

Scholz's star is actually a binary system formed by a small red dwarf, with about 9 % of the mass of the Sun, around which a much less bright and smaller brown dwarf orbits.

Other astronomers find the detections convincing, although most reserve the name «planet» for bodies that form within a planetary system and orbit stars, says theorist Alan Boss of the Carnegie Institution of Washington in Washington, D.C. «They should call them «planetary - mass brown dwarfs,»» Boss says.

In fact, while methane is a atmospheric characteristic of giant gas planets like Jupiter, the only brown dwarf found to even have a trace of methane was Gliese 229 B, which orbits a reddish, M - class dwarf located about 20 light - years away from Earth.

The failure, thus far, to find large substellar objects like brown dwarfs or a Jupiter - or Saturn - class planet in a «torch» orbit (closer han the Mercury to Sun distance) around 107 Piscium — with even the highly sensitive radial - velocity technique of Geoffrey W. Marcy and R. Paul Butler — bodes well for the possibility of Earth - type terrestrial planets around this star (Cumming et al, 1999).

The highly elliptical orbit, however, suggested that the gravity of an unseen object farther away from the star was pulling the planet outward, which was later detected by direct imaging as a methane brown dwarf — more below.

A few years later, even a brown dwarf or Jupiter - or Saturn - class planet in a inner orbit was discounted with further observations (Cumming et al, 1999).

The VLT / NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits.

The VLT / NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits: II - Survey description, results and performances

We used NaCo at VLT to explore t... ▽ More In anticipation of the VLT / SPHERE planet imager guaranteed time programs, we have conducted a preparatory survey of 86 stars between 2009 and 2013 in order to identify new faint comoving companions to ultimately carry out a comprehensive analysis of the occurence of giant planets and brown dwarf companions at wide (10 - 2000 AU) orbits around young, solar - type stars.

Using the radial velocity technique pioneered by Geoffrey Marcy and Paul Butler, the Lick Planet Search for substellar companions has thus far failed to find a brown dwarf or large Jupiter - or Saturn - mass object in a «torch» orbit around Beta Comae Berenices (Cumming et al, 1999).

Using the radial velocity technique pioneered by Geoffrey Marcy and Paul Butler, the Lick Planet Search for substellar companions has thus far failed to find a brown dwarf or large Jupiter - or Saturn - mass object in a «torch» orbit around Chi1 Orionis A (Cumming et al, 1999).

I can't get Andreeshchev and Scalo's diagram reproduced well enough to display well here, but they study the duration of residence in the evolving habitable zone as a function of the planet's distance from the brown dwarf, assuming a circular orbit.

As a result of this study, HD 284149 ABb therefore becomes the latest addition to the (short) list of brown dwarfs on wide circumbinary orbits, providing new evidence to support recent claims that object in such configuration occur with a similar frequency to wide companions to single stars.

On January 7, 2002, astronomers announced the discovery of a brown dwarf companion to this Sol - type star using direct imaging (see press release and graphics), whose mass and orbit were subsequently refined with 24 years of radial - velocity observations — Crepp et al, 2012, with more details below).

With a brown dwarf within a parsec of our own system being a hopeful and still - possible scenario for a more - accessible long - term destination than the Alpha Centauri system, I'd say the idea and hope that there could be something even semi-habitable in close orbit around that brown dwarf is a lot more exciting than just rocks or iceballs.

Using the radial velocity technique pioneered by Geoffrey W. Marcy and R. Paul Butler, the Lick Planet Search for substellar companions has thus far failed to find a brown dwarf or large Jupiter - or Saturn - mass object in a «torch» orbit around BD +04 123 (Cumming et al, 1999).

Moreover, the brown dwarf companion to 15 Sge may eventually prove to have a highly circular orbit that is coplanar with the circumstellar disk so that planets formed in inner orbits around the star.

Note: Thanks to Andrew James for notifying us of updated mass and orbit information for the brown dwarf companion to this star.

On the other hand, the discovery of a brown dwarf companion in a wide orbit that could perturb dormant comets in an Oort Cloud around Epsilon Indi inwards towards the star's inner planetary regions may periodically shower an Earth - type, inner planet with catastrophic impacts.

Using the radial velocity technique pioneered by Geoffrey Marcy and Paul Butler, the Lick Planet Search for substellar companions has thus far failed to find a brown dwarf or large Jupiter - or Saturn - mass object in a «torch» orbit around Kappa Ceti (Cumming et al, 1999).

Epsilon Indi is an orange - red dwarf star, with two methane brown dwarf companions in orbit around each other (more).

The prospect of life evolving on a planet orbiting around a brown dwarf is indeed fascinating.

Astronomers have also found planets that orbit pairs of stars rather than single stars, and other planets orbiting «failed» stars called brown dwarfs that aren't mighty enough to produce light and energy (or carry out fusion) like normal stars do.

Star Ba may have a brown dwarf companion (see Bb below) in a «torch orbit,» with an average separation of 0.06 AU in a highly circular orbit (e = 0.00) whose period is completed within four days.

The orbit of an Earth - like planet around the tight binary system that star Ba forms with its brown dwarf companion in the liquid water zone would have to be centered around 1.1 AU — a little farther than Earth's orbital distance around Sol — with an orbital period exceeding one Earth year.

The failure, thus far, to find large substellar objects like brown dwarfs or a Jupiter - or Saturn - class planet in a «torch» orbit (closer than the Mercury to Sun distance) around Xi Boötis A — with even the highly sensitive radial - velocity methods of Geoffrey W. Marcy and R. Paul Butler — bodes well for the possibility of Earth - type terrestrial planets around this star (Cumming et al, 1999).

They have been spotted with companions before, but this would be largest mass difference between a brown dwarf and its companion yet, with the brown dwarf being perhaps over 60 times the size of the orbiting planet.

This system contains a Venus - massed planet in orbit around a brown dwarf which is also in orbit around a low - mass star.

The brown dwarf / planet system is, in turn, orbiting around «A», forming a three - object system around 1,600 lightyears away from Earth.