Spitzer mid-IR monitoring of all known Y dwarfs yields variability fractions of 35-75% that, when combined with L/T dwarf data, weakly support condensate cloud variations as the driver of brown dwarf variability.
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ZTF data yielded 32 robust ultracool dwarf rotation periods including 12 new detections, with a trend of decreasing periods toward later spectral types in dwarfs older than 100 Myr.
citing papers explorer
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A Spitzer Space Telescope Exploration Science Program to Search for Y Dwarf Variability
Spitzer mid-IR monitoring of all known Y dwarfs yields variability fractions of 35-75% that, when combined with L/T dwarf data, weakly support condensate cloud variations as the driver of brown dwarf variability.
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A Search for Variability of Ultracool Dwarfs with the Zwicky Transient Facility
ZTF data yielded 32 robust ultracool dwarf rotation periods including 12 new detections, with a trend of decreasing periods toward later spectral types in dwarfs older than 100 Myr.