Magnetospherically driven optical and radio aurorae at the end of the stellar main sequence
| العنوان: | Magnetospherically driven optical and radio aurorae at the end of the stellar main sequence |
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| المؤلفون: | Michael P. Rupen, Gibor Basri, Alexey A. Kuznetsov, Leon K. Harding, Aaron Golden, Stephen Bourke, Svetlana V. Berdyugina, J. G. Doyle, S. P. Littlefair, Melodie M. Kao, J. S. Pineda, Garret Cotter, Gregg Hallinan, R. P. Butler, A. Antonova |
| بيانات النشر: | Springer Nature, 2015. |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Solar System, Dwarf star, Astrophysics::High Energy Astrophysical Phenomena, Brown dwarf, Magnetosphere, FOS: Physical sciences, Astrophysics, rotation, Jovian, Atmosphere, m8.5 dwarf, Planet, magnetic activity, Astrophysics::Solar and Stellar Astrophysics, simultaneous multiwavelength observations, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics::Galaxy Astrophysics, brown dwarf, Physics, Multidisciplinary, variability, emissions, Astronomy, temperature, transition, Stars, ultracool dwarfs, Astrophysics - Solar and Stellar Astrophysics, Physics::Space Physics, Astrophysics::Earth and Planetary Astrophysics |
| الوصف: | Aurorae are detected from all the magnetized planets in our Solar System, including Earth. They are powered by magnetospheric current systems that lead to the precipitation of energetic electrons into the high-latitude regions of the upper atmosphere. In the case of the gas-giant planets, these aurorae include highly polarized radio emission at kilohertz and megahertz frequencies produced by the precipitating electrons, as well as continuum and line emission in the infrared, optical, ultraviolet and X-ray parts of the spectrum, associated with the collisional excitation and heating of the hydrogen-dominated atmosphere. Here we report simultaneous radio and optical spectroscopic observations of an object at the end of the stellar main sequence, located right at the boundary between stars and brown dwarfs, from which we have detected radio and optical auroral emissions both powered by magnetospheric currents. Whereas the magnetic activity of stars like our Sun is powered by processes that occur in their lower atmospheres, these aurorae are powered by processes originating much further out in the magnetosphere of the dwarf star that couple energy into the lower atmosphere. The dissipated power is at least four orders of magnitude larger than what is produced in the Jovian magnetosphere, revealing aurorae to be a potentially ubiquitous signature of large-scale magnetospheres that can scale to luminosities far greater than those observed in our Solar System. These magnetospheric current systems may also play a part in powering some of the weather phenomena reported on brown dwarfs. Comment: Accepted for publication in the 30 July 2015 issue of Nature. 27 pages, 2 figures, 2 extended data figures |
| وصف الملف: | application/pdf; image/jpeg |
| اللغة: | English |
| تدمد: | 0028-0836 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab3234b78841a6a881409d9fb0f30c95 https://eprints.whiterose.ac.uk/171516/1/1507.08739v1.pdf |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....ab3234b78841a6a881409d9fb0f30c95 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00280836 |
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