Ultra-cool companion helps reveal giant planets

May 10, 2012
This artist's impression shows BD+01 2920B in the foreground (on the right hand side), with its host star in the background. The colour and banded atmosphere of the brown dwarf result from atmospheric gases and turbulence. Credit: J. Pinfield, for the RoPACS network at the University of Hertfordshire

(Phys.org) -- An international team of astronomers led by David Pinfield of the University of Hertfordshire has found a brown dwarf that is more than 99% hydrogen and helium. Described as ultra-cool, it has a temperature of just 400 degrees Celsius and its discovery could be a key step forward in helping astronomers distinguish between brown dwarfs and giant planets. The researchers publish their work in the journal Monthly Notices of the Royal Astronomical Society.

Brown dwarfs are star-like objects with insufficient mass to ignite hydrogen fusion in their cores. Over time they cool to temperatures of just a few hundred degrees. Formed like stars from the collapse of a giant molecular cloud a few hundred light years across, brown dwarfs in such as this have the same as their .

In contrast, form with a more diverse chemistry. Those in our own solar system first formed as large solid cores, which then accreted gas from the disk around them. This led to a different chemistry in their outer layers. For example, when the entered Jupiter's atmosphere in 1995, it found the proportion of heavier elements (astronomers call these 'metals') to be three times higher than in the Sun. Such differences allow astronomers to discriminate between planets and brown dwarfs and reveal their formation mechanisms.

Dr Pinfield and his team detected the brown dwarf using data from the Wide-field Infrared Explorer (WISE) satellite, the UK (UKIRT) in Hawaii and the Visible and Infrared Survey Telescope for Astronomy (VISTA) in Chile. He carried out this work as part of his European (FP7) Initial Training Network RoPACS which studies planets around cool stars.

The newly discovered object, known as BD+01 2920B, is about 35 times more massive than Jupiter. It orbits its host star at a distance of 390 billion km or about 2600 times the average distance from the Earth to the Sun.

Searches for planets around other stars find many possible planets through the gravitational pull of the candidate objects on the stars they orbit as well as direct imaging using the latest (and future) optical technology on the largest telescopes. The problem is that compact brown dwarfs share many characteristics with giant planets, so astronomers struggle to confirm the nature of what they detect.

The new work has been made possible by combining data from ground- and space-based surveys, says Dr Pinfield. "Surveys from telescopes like VISTA and UKIRT and orbiting observatories like WISE are giving us an unprecedented view of 'ultra-cool' bodies in our neighbourhood."

'By finding these rare objects in orbit around nearby stars, we get a handle on the bigger picture; that we live in a galaxy where both giant planets and are commonplace."

Explore further: Continents may be a key feature of Super-Earths

More information: The new work appears in, "Discovery of the benchmark metal poor T8 dwarf BD+01 2920B", D. J. Pinfield et al, Monthly Notices of the Royal Astronomical Society. A preprint of the paper can be seen at arxiv.org/abs/1201.3243 and the final version is available at adsabs.harvard.edu/doi/10.1111/j.1365-2966.2012.20549.x

Related Stories

Astronomers discover coolest objects outside solar system

Jan 26, 2011

UK's University of Hertfordshire astronomers have measured the distances to 11 of the coolest objects ever discovered outside our solar system. The 11 cool objects – known as brown dwarfs – have masses intermediate ...

Astronomers find bounty of failed stars

Oct 11, 2011

A University of Toronto-led team of astronomers has discovered over two dozen new free-floating brown dwarfs, including a lightweight youngster only about six times heftier than Jupiter, that reside in two ...

Smashing young stars leave dwarfs in their wake

Jun 09, 2006

Astronomers have discovered that the large disks of gas and dust around young stars will fragment if two young stars pass close to each other and form smaller brown dwarfs stars with disks of their own.

Super cold brown dwarf or is it a planet?

Mar 23, 2011

(PhysOrg.com) -- In a month that has already announced the discovery of a brown dwarf 75 light-years from Earth, NASA’s infrared Spitzer Space Telescope has found what could prove to be an even cooler, ...

Recommended for you

Continents may be a key feature of Super-Earths

1 hour ago

Huge Earth-like planets that have both continents and oceans may be better at harboring extraterrestrial life than those that are water-only worlds. A new study gives hope for the possibility that many super-Earth ...

Exoplanets soon to gleam in the eye of NESSI

4 hours ago

(Phys.org) —The New Mexico Exoplanet Spectroscopic Survey Instrument (NESSI) will soon get its first "taste" of exoplanets, helping astronomers decipher their chemical composition. Exoplanets are planets ...

A sharp eye on Southern binary stars

Apr 17, 2014

Unlike our sun, with its retinue of orbiting planets, many stars in the sky orbit around a second star. These binary stars, with orbital periods ranging from days to centuries, have long been the primary ...

User comments : 0

More news stories

The importance of plumes

The Hubble Space Telescope is famous for finding black holes. It can pick out thousands of galaxies in a patch of sky the size of a thumbprint. The most powerful space telescope ever built, the Hubble provided ...

Continents may be a key feature of Super-Earths

Huge Earth-like planets that have both continents and oceans may be better at harboring extraterrestrial life than those that are water-only worlds. A new study gives hope for the possibility that many super-Earth ...

LADEE mission ends with planned lunar impact

(Phys.org) —Ground controllers at NASA's Ames Research Center in Moffett Field, Calif., have confirmed that NASA's Lunar Atmosphere and Dust Environment Explorer (LADEE) spacecraft impacted the surface ...

Researchers successfully clone adult human stem cells

(Phys.org) —An international team of researchers, led by Robert Lanza, of Advanced Cell Technology, has announced that they have performed the first successful cloning of adult human skin cells into stem ...