idw – Informationsdienst Wissenschaft

Nachrichten, Termine, Experten

Grafik: idw-Logo
Thema Corona

Science Video Project
idw-Abo

idw-News App:

AppStore

Google Play Store



Teilen: 
29.09.2011 12:12

Stardust discovered in far-off planetary systems

Stephan Laudien Stabsstelle Kommunikation/Pressestelle
Friedrich-Schiller-Universität Jena

    Spectacular Discovery: Astronomers of the University Jena find a stardust belt in extra-solar planetary systems

    Searching for extra-solar planets – which are planets outside of our solar system - is very popular these days. About 700 planets are known at the moment, a number that is continuously rising due to refined observational techniques. Professor Alexander Krivov and his team of astronomers of the Friedrich Schiller University Jena (Germany) just made a remarkable discovery: the scientists from the Astrophysical Institute were able to establish proof of so-called debris discs around two stars. The debris discs are remnants of the formation of the planets. “We are dealing with enormous accumulations of chunks of matter which create dust when they collide“, Alexander Krivov says. This dust is of greatest importance for the astronomers, because it helps to draw conclusions about the planet formation. There are even two debris discs in our solar system, the asteroid belt and the Kuiper belt amongst whose bodies the dwarf planet Pluto belongs.

    What makes the Jena discovery so special is the tremendous distance from our solar system to the stars with the debris discs. “These stars are hundreds of light years away from the Earth“, according to Krivov. The particular focus is on TrES-2 in the Draco constellation and XO-5 in the Lynx constellation. Planets orbiting these stars can only be detected with the help of the transit method. It sounds like a simple principle: The night sky is photographed in regular intervals. Special software then checks the brightness of the stars on the images. If, in regular intervals, there are differences in brightness it is likely that a planet passes between the star and its observers.

    The astronomers found evidence for the stardust with the help of photometric analysis. At first the characteristics of the stars can be analysed with it. If there are irregularities in the invisible infrared range, they point to the existence of stardust. Krivov says: “The dust is warmed up by the star and radiates heat. We see that radiation curve is above the radiation curve of the star as a clear sign of the existence of stardust.”

    Professor Krivov draws an impressive comparison for the search of debris discs in the vastness of the universe: it is as if you would detect an ice-cream cooled down to minus 130 degrees with a heat detector in a 5,000 kilometer distance from Jena.

    Alexander Krivov’s team of scientists concentrated its search for debris disc candidates on about 100 known extra-solar systems with transiting planets. Of these systems, they found 52 in the observational results of the US-American space telescope WISE published in April this year. The Jena scientists got lucky with two systems. As early as 1 June Alexander Krivov, Martin Reidemeister, Simone Fiedler, Dr. Torsten Löhne und Professor Ralph Neuhäuser submitted their paper to the science magazine ‘Monthly Notices of the Royal Astronomical Society’ for publication in the ‘Letters’ section. Meanwhile the paper has been published under the title ‘Debris disc candidates in systems with transiting planets’ (doi:10.1111/j.1745-3933.2011.01133.x).

    Contact Details:
    Prof. Dr. Alexander Krivov
    Astrophysikalisches Institut und Universitätssternwarte der Friedrich-Schiller-Universität Jena
    Schillergässchen 2-3, D-07745 Jena
    phone: ++49 3641 947530
    email: krivov[at]astro.uni-jena.de


    Weitere Informationen:

    http://www.uni-jena.de


    Merkmale dieser Pressemitteilung:
    Journalisten, Wissenschaftler
    Physik / Astronomie
    überregional
    Forschungsergebnisse, Wissenschaftliche Publikationen
    Englisch


    Around the stars TrES-2 in the Draco constellation and XO-5 in the Lynx constellation astronomers from Jena University found a stardust belt.


    Zum Download

    x

    Hilfe

    Die Suche / Erweiterte Suche im idw-Archiv
    Verknüpfungen

    Sie können Suchbegriffe mit und, oder und / oder nicht verknüpfen, z. B. Philo nicht logie.

    Klammern

    Verknüpfungen können Sie mit Klammern voneinander trennen, z. B. (Philo nicht logie) oder (Psycho und logie).

    Wortgruppen

    Zusammenhängende Worte werden als Wortgruppe gesucht, wenn Sie sie in Anführungsstriche setzen, z. B. „Bundesrepublik Deutschland“.

    Auswahlkriterien

    Die Erweiterte Suche können Sie auch nutzen, ohne Suchbegriffe einzugeben. Sie orientiert sich dann an den Kriterien, die Sie ausgewählt haben (z. B. nach dem Land oder dem Sachgebiet).

    Haben Sie in einer Kategorie kein Kriterium ausgewählt, wird die gesamte Kategorie durchsucht (z.B. alle Sachgebiete oder alle Länder).