SIMBAD references

2021ApJ...914..124B - Astrophys. J., 914, 124-124 (2021/June-3)

Cloud properties of brown dwarf binaries across the L/T transition.


Abstract (from CDS):

We present a new suite of atmosphere models with flexible cloud parameters to investigate the effects of clouds on brown dwarfs across the L/T transition. We fit these models to a sample of 13 objects with well-known masses, distances, and spectral types spanning L3-T5. Our modeling is guided by spatially resolved photometry from the Hubble Space Telescope and the W. M. Keck Telescopes covering visible to near-infrared wavelengths. We find that, with appropriate cloud parameters, the data can be fit well by atmospheric models with temperature and surface gravity in agreement with the predictions of evolutionary models. We see a clear trend in the cloud parameters with spectral type, with earlier-type objects exhibiting higher-altitude clouds with smaller grains (0.25-0.50 µm) and later-type objects being better fit with deeper clouds and larger grains (>=1 µm). Our results confirm previous work that suggests L dwarfs are dominated by submicron particles, whereas T dwarfs have larger particle sizes.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Brown dwarfs - Stellar evolutionary models - Stellar atmospheres - Atmospheric clouds - L dwarfs - T dwarfs - HST photometry - Infrared photometry

Simbad objects: 35

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