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Ionization in atmospheres of brown dwarfs and extrasolar planets. I. The role of electron avalanche

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helling2011astrophysicj4.pdf (332.9Kb)
Date
20/01/2011
Author
Helling, Christiane
Jardine, M.
Witte, S.
Diver, D. A.
Funder
Science & Technology Facilities Council
Grant ID
ST G001987 1
Keywords
Brown dwarfs
Plasmas
Stars: atmospheres
QB Astronomy
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Abstract
Brown dwarf and extrasolar planet atmospheres form clouds which strongly influence the local chemistry and physics. These clouds are globally neutral obeying dust-gas charge equilibrium which is, on short timescales, inconsistent with the observation of stochastic ionization events of the solar system planets. We argue that a significant volume of the clouds in brown dwarfs and extrasolar planets is susceptible to local discharge events. These are electron avalanches triggered by charged dust grains. Such intra-cloud discharges occur on timescales shorter than the time needed to neutralize the dust grains by collisional processes. An ensemble of discharges is likely to produce enough free charges to suggest a partial and stochastic coupling of the atmosphere to a large-scale magnetic field.
Citation
Helling , C , Jardine , M , Witte , S & Diver , D A 2011 , ' Ionization in atmospheres of brown dwarfs and extrasolar planets. I. The role of electron avalanche ' , Astrophysical Journal , vol. 727 , no. 1 , 4 . https://doi.org/10.1088/0004-637X/727/1/4
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.1088/0004-637X/727/1/4
ISSN
0004-637X
Type
Journal article
Rights
© 2011. The American Astronomical Society. All rights reserved.
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/4756

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