with ages 1 Myr to 1 Gyr and compare the rotation rates predicted by evolutionary models assuming angular momentum conservation. We find that the rotation rates of the current sample of brown dwarfs fall within the expected range set by evolutionary models and breakup limits.'
author:
- 'Johanna M. Vos'
- 'Beth A. Biller'
- 'Katelyn N. Allers'
- 'Jacqueline K. Faherty'
- 'Michael C. Liu'
- Stanimir Metchev
- Simon Eriksson
- Elena Manjavacas
- 'Trent J. Dupuy'
- Markus Janson
- 'Jacqueline Radigan-Hoffman'
- Ian Crossfield
- Mickaël Bonnefoy
- 'William M. J. Best'
- Derek Homeier
- 'Joshua E. Schlieder'
- Wolfgang Brandner
- Thomas Henning
- Mariangela Bonavita
- Esther Buenzli
bibliography:
- 'Full\_paper.bib'
title: '*Spitzer* Variability Properties of Low-Gravity L Dwarfs'
---

Introduction {#sec:intro}
============

Photometric variability monitoring directly probes atmospheric features in exoplanet and brown dwarf atmospheres, as it is sensitive to the spatial distribution of inhomogeneities such as condensate clouds, compositional and/or temperature fluctuations [@Marley2012; @Tremblin2016] as a planet rotates. [Variability studies of field brown dwarfs have begun to reveal the complex, evolving nature of their atmospheres [@Biller2017; @Artigau2018 and references therein]. Recent variability monitoring with *Spitzer* and the *Very Large Array* has 