A Uniform Retrieval Analysis on a Sample of 16 T-dwarfs
Abstract
The spectra of brown dwarfs are key to exploring the chemistry and physics that takes place in their atmospheres. T-dwarf spectra are particularly diagnostic due to their relatively cloud free atmospheres and deep molecular bands. With the use of powerful atmospheric retrieval tools, these properties permit relatively precise constraints on the molecular/atomic abundances and temperature profiles. Constraints on these properties can be used to derive the elemental abundances (metallicity, C/O), chemical disequilibrium, and non-radiative-convective equilibrium temperature perturbations. Previous analyses on T- and Y-dwarfs (Line et al. 2017; Zalesky et al. 2018) have begun to obtain such properties. Here we present a uniform retrieval analysis on a sample of 16 recently observed T-dwarf spectra from the IRTF SPeX instrument. This analysis more than doubles the sample of retrieved properties of T-dwarfs. We present updates on current compositional trends and thermal profile constraints amongst the T-dwarf population.
- Publication:
-
American Astronomical Society Meeting Abstracts #233
- Pub Date:
- January 2019
- Bibcode:
- 2019AAS...23325924S