Colors and Kinematics of L Dwarfs From the Sloan Digital Sky Survey
Sarah J. Schmidt, Andrew A. West, Suzanne L. Hawley, J. Sebastian, Pineda

TL;DR
This study presents a large sample of L dwarfs from SDSS, analyzing their colors, distances, and kinematics to understand their population characteristics and age distribution.
Contribution
It provides a new, larger sample of L dwarfs with detailed color, distance, and velocity data, revealing correlations between color and age, and identifying different dynamical populations.
Findings
L dwarfs are bluer than previously known at certain spectral types.
Color correlates with velocity dispersion, indicating age differences.
Evidence for both young and old disk populations among L dwarfs.
Abstract
We present a sample of 484 L dwarfs, 210 of which are newly discovered from the Sloan Digital Sky Survey (SDSS) Data Release 7 spectroscopic database. We combine this sample with known L dwarfs to investigate their colors. Our spectroscopically selected sample has 0.1 magnitude bluer median colors at a given spectral type (for L0 to L4) than previously known L dwarfs, which reflects a bias towards redder L dwarfs in past selection criteria. We present photometric distance relations based on and colors and derive distances to our L dwarf sample. We combine the distances with SDSS/2MASS proper motions in order to examine the tangential velocities. For the majority of our spectroscopic sample, we measured radial velocities and present three dimensional kinematics. We also provide H detections for the fraction of our sample with sufficient quality…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astrophysics and Star Formation Studies
