Zones, spots, and planetary-scale waves beating in brown dwarf atmospheres

Brown dwarfs are massive analogs of extrasolar giant planets and may host types of atmospheric circulation not seen in the solar system. We analyzed a long-term Spitzer Space Telescope infrared monitoring campaign of brown dwarfs to constrain cloud cover variations over a total of 192 rotations. The...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2017-08, Vol.357 (6352), p.683-687
Main Authors: Apai, D., Karalidi, T., Marley, M. S., Yang, H., Flateau, D., Metchev, S., Cowan, N. B., Buenzli, E., Burgasser, A. J., Radigan, J., Artigau, E., Lowrance, P.
Format: Article
Language:English
Subjects:
Atmosphere
Atmospheric circulation
Atmospheric physics
Bright spots
Brightness
Brown dwarf stars
Brown dwarfs
Cloud cover
Clouds
Extrasolar planets
Gas giant planets
Infrared analysis
Infrared imagery
Infrared telescopes
Jupiter
Neptune
Physics
Planetary atmospheres
Planetary evolution
Solar system
Space telescopes
Temperature
Variation
Wind speed
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Summary:Brown dwarfs are massive analogs of extrasolar giant planets and may host types of atmospheric circulation not seen in the solar system. We analyzed a long-term Spitzer Space Telescope infrared monitoring campaign of brown dwarfs to constrain cloud cover variations over a total of 192 rotations. The infrared brightness evolution is dominated by beat patterns caused by planetary-scale wave pairs and by a small number of bright spots. The beating waves have similar amplitudes but slightly different apparent periods because of differing velocities or directions. The power spectrum of intermediate-temperature brown dwarfs resembles that of Neptune, indicating the presence of zonal temperature and wind speed variations. Our findings explain three previously puzzling behaviors seen in brown dwarf brightness variations.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.aam9848