• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
  • Skip to footer
  • Facebook
  • Instagram
  • LinkedIn
  • TikTok
  • Twitter
  • YouTube
CDE Almería – Centro de Documentación Europea – Universidad de Almería

CDE Almería - Centro de Documentación Europea - Universidad de Almería

Centro de Documentación Europea de la Universidad de Almería

  • HOME
  • WHAT´S ON
    • EU BULLETINS
    • EU NEWS
    • Activities
    • EU Calls and Awards
    • Radio Program «Europe with You»
  • DOCUMENTATION
    • Bibliographic Collection
      • Almería EDC Digital Collection
      • UNIVERSITY OF ALMERIA LIBRARY
    • Documentation by topic
    • EU Media Collection
      • Web Space
      • MEDIATHEQUE REPOSITORY
  • Europe on the net
    • Institutions
    • EU Representation in Spain
    • European information network of Andalusia
    • EU official journal
  • ABOUT US
    • Presentation
    • People
    • Contact
  • Spanish
  • English

Enigma: a dwarf star produces a supereruption

Inicio » EU News » Enigma: a dwarf star produces a supereruption

28 de February de 2020

A star of about eight percent the Sun’s mass has been caught emitting an enormous ‘super flare’ of X-rays – a dramatic high-energy eruption that poses a fundamental problem for astronomers, who did not think it possible on stars that small.

J0331-27

The culprit, known by its catalogue number J0331-27, is a kind of star called an L dwarf. This is a star with so little mass that it is only just above the boundary of actually being a star. If it had any less mass, it would not possess the internal conditions necessary to generate its own energy.

Astronomers spotted the enormous X-ray flare in data recorded on 5 July 2008 by the European Photon Imaging Camera (EPIC) onboard ESA’s XMM-Newton X-ray observatory. In a matter of minutes, the tiny star released more than ten times more energy of even the most intense flares suffered by the Sun.

Flares are released when the magnetic field in a star’s atmosphere becomes unstable and collapses into a simpler configuration. In the process, it releases a large proportion of the energy that has been stored in it.

“This is the most interesting scientific part of the discovery, because we did not expect L-dwarf stars to store enough energy in their magnetic fields to give rise to such outbursts,” says Beate Stelzer, Institut für Astronomie und Astrophysik Tübingen, Germany, and INAF – Osservatorio Astronomico di Palermo, Italy, who was part of the study team.

Energy can only be placed in a star’s magnetic field by charged particles, which are also known as ionised material and created in high-temperature environments. As an L dwarf, however, J0331-27 has a low surface temperature for a star – just 2100K compared to the roughly 6000K on the Sun. Astronomers did not think such a low temperature would be capable of generating enough charged particles to feed so much energy into the magnetic field. So the conundrum is: how a super flare is even possible on such a star.

The super flare was discovered in the XMM-Newton data archive as part of a large research project led by Andrea De Luca of INAF – Istituto di Astrofisica Spaziale e Fisica Cosmica in Milan, Italy. The project studied the temporal variability of around 400 000 sources detected by XMM-Newton over 13 years

A number of similar stars had been seen to emit super flares in the optical part of the spectrum, but this is the first unambiguous detection of such an eruption at X-ray wavelengths.

Further steps

Understanding the similarities and differences between this new – and so far unique – super flare on the L dwarf and previously observed flares, detected at all wavelengths on stars of higher mass is now a priority for the team.

One clue they do have is that there is only one flare from J0331-27 in the data, despite XMM-Newton having observed the star for a total of 3.5 million seconds – about 40 days. This is peculiar because other flaring stars tend to suffer from numerous smaller flares too.

“The data seem to imply that it takes an L dwarf longer to build up the energy, and then there is one sudden big release,” says Beate.

Stars that flare more frequently release less energy each time, while this L dwarf seems to release energy very rarely but then in a really big event.

More information

Full news

Publicaciones relacionadas:

Trending Science: Planets out there more habitable than Earth? Isotopic makeup of meteorites sheds light on the early solar system Space19: Road to ESA’s Council at Ministerial Level Discs of newborn stars related to the formation of new planets Seeking answers to the great questions of the Universe

“This is a space for debate. All comments, for or against publication, that are respectful and do not contain expressions that are discriminatory, defamatory or contrary to current legislation will be published”.

Reader Interactions

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Primary Sidebar

Publicaciones relacionadas

Trending Science: Planets out there more habitable than Earth? Isotopic makeup of meteorites sheds light on the early solar system Space19: Road to ESA’s Council at Ministerial Level Discs of newborn stars related to the formation of new planets Seeking answers to the great questions of the Universe

Footer

Logotipo en negativo del Centro de Documentación Europea de Almería
  • CDE Almería
  • Edificio Parque Científico-Tecnológico (Pita)
  • Planta: 1ª, Despacho: 2904120.
  • Ctra. Sacramento s/n. Almería (Spain)
  • Teléfono: (+34) 950 015266

HOME
NEWS
DOCUMENTATION
EUROPE ON THE NET
ABOUT US

  • LEGAL NOTICE
  • PRIVACY POLICY
  • COOKIE POLICY
  • ACCESSIBILITY
  • SITEMAP

Copyright © 2023 CDE Almería · Creative Commons LicenseThis work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

<p>El Centro de Documentación Europea de la Universidad de Almería utiliza cookies propias y de terceros para facilitar al usuario la navegación en su página Web y el acceso a los distintos contenidos alojados en la misma. Asimismo, se utilizan cookies analíticas de terceros para medir la interacción de los usuarios con el sitio Web. Pinche el siguiente enlace si desea información sobre el uso de cookies y como deshabilitarlas. ajustes</p>

Politica de privacidad

El Centro de Documentación Europea de la Universidad de Almería utiliza cookies propias y de terceros para facilitar al usuario la navegación en su página Web y el acceso a los distintos contenidos alojados en la misma. Asimismo, se utilizan cookies analíticas de terceros para medir la interacción de los usuarios con el sitio Web. Pinche el siguiente enlace si desea información sobre el uso de cookies y como deshabilitarlas. <a href="/politica-de-cookies" rel="noopener" target="_blank">Más información</a>

Cookies estrictamente necesarias

Las cookies estrictamente necesarias tiene que activarse siempre para que podamos guardar tus preferencias de ajustes de cookies.

Básicamente la web no funcionara bien si no las activas.

Estas cookies son:

  • Comprobación de inicio de sesión.
  • Cookies de seguridad.
  • Aceptación/rechazo previo de cookies.

Si desactivas esta cookie no podremos guardar tus preferencias. Esto significa que cada vez que visites esta web tendrás que activar o desactivar las cookies de nuevo.

Cookies de terceros

Esta web utiliza Google Analytics, Google Tag Manager y Yandex Metrika para recopilar información anónima tal como el número de visitantes del sitio, o las páginas más populares.

Dejar estas cookies activas nos permite mejorar nuestra web.

¡Por favor, activa primero las cookies estrictamente necesarias para que podamos guardar tus preferencias!

Política de cookies

Pinche el siguiente enlace si desea información sobre el uso de cookies y como deshabilitarlas. Más información