English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Context: Observations of auroral emissions are powerful means to remotelysense the space plasma environment around planetary bodies and ultracooldwarfs. Therefore successful searches and characterization of aurorae outsidethe Solar System will open new avenues in the area of extrasolar space physics.Aims: We aim to demonstrate that brown dwarfs are ideal objects to search forUV aurora outside the Solar System. We specifically search for UV aurora on thelate-type T6.5 brown dwarf 2MASS J12373919+6526148 (in the following 2MASSJ1237+6526). Methods: Introducing a parameter referred to as auroral powerpotential, we derive scaling models for auroral powers for rotationally drivenaurora applicable to a broad range of wavelengths. We also analyze Hubble SpaceTelescope observations obtained with the STIS camera at near-UV, far-UV, andLy-$\alpha$ wavelengths of 2MASS J1237+6526. Results: We show that browndwarfs, due to their typically strong surface magnetic fields and fastrotation, can produce auroral UV powers on the order of 10$^{19}$ watt or more.Considering their negligible thermal UV emission, their potentially powerfulauroral emissions make brown dwarfs ideal candidates for detecting extrasolaraurorae. We find possible emission from 2MASS J1237+6526, but cannotconclusively attribute it to the brown dwarf due to low signal-to-noise valuesin combination with nonsystematic trends in the background fluxes. Theobservations provide upper limits for the emission at various UV wavelengthbands. The upper limits for the emission correspond to a UV luminosity of$\sim$1 $\times$ 10$^{19}$ watt, which lies in the range of the theoreticallyexpected values. Conclusions: The possible auroral emission from the dwarfcould be produced by a close-in companion and/or magnetospheric transportprocesses.

Brown dwarfs as ideal candidates for detecting UV aurora outside the Solar System: Hubble Space Telescope observations of 2MASS J1237+6526