Forum für Wissenschaft, Industrie und Wirtschaft

Hauptsponsoren:     3M 
Datenbankrecherche:

 

New evidence indicates auroras occur outside our solar system

22.01.2013
University of Leicester-led study suggests 'northern lights' occur on some small and 'failed' stars

University of Leicester planetary scientists have found new evidence suggesting auroras – similar to Earth's Aurora Borealis - occur on bodies outside our solar system.

Auroras occur on several planets within our solar system, and the brightest - on Jupiter – are 100 times brighter than those on Earth. However, no auroras have yet been observed beyond Neptune.

A new study led by University of Leicester lecturer Dr Jonathan Nichols has shown that processes strikingly similar to those which power Jupiter's auroras could be responsible for radio emissions detected from a number of objects outside our solar system.

In addition, the radio emissions are powerful enough to be detectable across interstellar distances – meaning that auroras could provide an effective way of observing new objects outside our solar system.

Auroras occur when charged particles in an object's magnetosphere collide with atoms in its upper atmosphere, causing them to glow. However, before hitting the atmosphere, these particles also emit radio waves into space.

The study, Origin of Electron Cyclotron Maser Induced Radio Emissions at Ultracool Dwarfs: Magnetosphere-Ionosphere Coupling Currents, which recently appeared in the Astrophysical Journal, shows that this phenomenon is not limited to our solar system.

It shows that the radio emissions from a number of ultracool dwarfs may be caused in a very similar, but significantly more powerful, way to Jupiter's auroras.

Dr Nichols, a Lecturer and Research Fellow in the University of Leicester's Department of Physics and Astronomy, said: "We have recently shown that beefed-up versions of the auroral processes on Jupiter are able to account for the radio emissions observed from certain "ultracool dwarfs" - bodies which comprise the very lowest mass stars - and "brown dwarfs" - 'failed stars' which lie in between planets and stars in terms of mass.

"These results strongly suggest that auroras do occur on bodies outside our solar system, and the auroral radio emissions are powerful enough - one hundred thousand times brighter than Jupiter's - to be detectable across interstellar distances."

The paper, which also involved researchers at the Center for Space Physics, Boston University, USA, could have major implications for the detection of planets and objects outside our solar system which could not be discovered with other methods.

What's more, the radio emission could provide us with key information about the length of the planet's day, the strength of its magnetic field, how the planet interacts with its parent star and even whether it has any moons.

Dr Nichols added: "I am part of a group who have recently been awarded time on the Low Frequency Array (LOFAR) - centred in the Netherlands but with stations across a number of countries in northern Europe including the UK - to try to observe auroras on exoplanets, so hopefully there will be some interesting results soon."

Dr Nichols' work was funded by the Science and Technology Facilities Council.

The LOFAR exoplanets work is led by Philippe Zarka, based at CNRS Observatory, Paris.

For more information, please contact Dr Nichols on +44 (0)116 252 5049 or at: jdn@ion.le.ac.uk

The full paper can be found at: http://iopscience.iop.org/0004-637X/760/1/59

For more information about the Science and Technology Facilities Council visit: http://www.stfc.ac.uk/About+STFC/19072.aspx

Dr Jonathan Nichols | EurekAlert!
Further information:
http://www.le.ac.uk

More articles from Physics and Astronomy:

nachricht UA Astronomers Witness Asteroid Smashup
29.08.2014 | University of Arizona

nachricht Researchers Use NASA and Other Data to Look Into the Heart of a Solar Storm
29.08.2014 | NASA/Goddard Space Flight Center

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Anzeige

Anzeige

IHR
JOB & KARRIERE
SERVICE
im innovations-report
in Kooperation mit academics
Veranstaltungen

Tagung „Brandschutz im Tank- und Gefahrgutlager“ am 03. November 2014

29.08.2014 | Veranstaltungen

Experten der modernen Optikfertigung treffen sich am 23./24. September in Wetzlar

29.08.2014 | Veranstaltungen

Klinische Kompetenzen und Nachwuchsgewinnung sind inhaltliche Schwerpunkte beim DEGAM-Kongress

29.08.2014 | Veranstaltungen

 
B2B-VideoLinks
Weitere VideoLinks >>>
Aktuelle Beiträge

Siemens präsentiert Lösungen im Kampf gegen kardiovaskuläre Erkrankungen

29.08.2014 | Medizintechnik

Hirnstimulation verbessert Gedächtnisleistung

29.08.2014 | Studien Analysen

Künstliche Zellen: Wie weit wollen wir gehen?

29.08.2014 | Biowissenschaften Chemie