Brown Dwarf Variability and implications for Exoplanets - Tyler Robinson...
Δημοσιεύτηκε στις 12 Μαΐ 2015
Brown
dwarfs are sub-stellar objects that occupy the region of parameter
space between gas giant planets, like Jupiter, and the smallest bona
fide stars. Since brown dwarfs never achieve sustained core hydrogen
fusion, they are destined to cool over cosmic timescales from thousands
to hundreds of degrees Kelvin. Observations and models of these strange
worlds reveal hydrogen-dominated atmospheres with a variety of trace
molecular species, as well as metal, dust, and salt condensates.
Recent
surveys and targeted observations have revealed that a substantial
fraction of brown dwarfs have a brightness that varies in time, with
some variations as large as 30% at certain wavelengths. In this
presentation, Dr. Robinson will review the atmospheric physics of brown
dwarfs and the current state of variability observations, and he will
discuss the various processes that likely cause brown dwarf variability,
which include dynamical effects, temporally- and spatially-varying
clouds, and associated atmospheric temperature fluctuations.
dwarfs are sub-stellar objects that occupy the region of parameter
space between gas giant planets, like Jupiter, and the smallest bona
fide stars. Since brown dwarfs never achieve sustained core hydrogen
fusion, they are destined to cool over cosmic timescales from thousands
to hundreds of degrees Kelvin. Observations and models of these strange
worlds reveal hydrogen-dominated atmospheres with a variety of trace
molecular species, as well as metal, dust, and salt condensates.
Recent
surveys and targeted observations have revealed that a substantial
fraction of brown dwarfs have a brightness that varies in time, with
some variations as large as 30% at certain wavelengths. In this
presentation, Dr. Robinson will review the atmospheric physics of brown
dwarfs and the current state of variability observations, and he will
discuss the various processes that likely cause brown dwarf variability,
which include dynamical effects, temporally- and spatially-varying
clouds, and associated atmospheric temperature fluctuations.
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