On the Radii of Brown Dwarfs Measured with AKARI Near-Infrared Spectroscopy

Abstract

We derive the radii of 16 brown dwarfs observed by AKARI using their parallaxes and the ratios of observed to model fluxes. We find that the brown dwarf radius ranges between 0.64-1.13 RJ with an average radius of 0.83 RJ. We find a trend in the relation between radii and Teff; the radius is at a minimum at Teff~1600 K, which corresponds to the spectral types of mid-to late-L. The result is interpreted by a combination of radius-mass and radius-age relations that are theoretically expected for brown dwarfs older than 10^8 yr.

22 pages, 3 figures; submitted 2012 October 14 and accepted 2013 February 12 for publication to The Astrophysical Journal

References in corpus (1)

• The Solar Neighborhood XVII: Parallax Results from the CTIOPI 0.9m Program -- Twenty New Members of the RECONS 10 Parsec Sample

Cited by in corpus (10)

• Atmospheres of Brown Dwarfs
• IC348-SMM2E: a Class 0 proto-brown dwarf candidate forming as a scaled-down version of low-mass stars
• WISEP J004701.06+680352.1: An intermediate surface gravity, dusty brown dwarf in the AB Dor Moving Group
• A precise architecture characterization of the $\pi$ Men planetary system
• 37 New Validated Planets in Overlapping K2 Campaigns
• Rotation periods and photometric variability of rapidly rotating ultra-cool dwarfs
• The Deepest Constraints on Radio and X-ray Magnetic Activity in Ultracool Dwarfs from WISE J104915.57-531906.1
• Modelling the environment around five ultracool dwarfs via the radio domain
• A Comparative L-dwarf Sample Exploring the Interplay Between Atmospheric Assumptions and Data Properties
• Effects of Rotation on the Spectra of Brown Dwarfs