dc.contributor.author | Schmidt, Sarah J. | |
dc.contributor.author | Hawley, Suzanne L. | |
dc.contributor.author | Pineda, J. Sebastian | |
dc.contributor.author | West, A. A. | |
dc.date.accessioned | 2015-01-22T18:50:24Z | |
dc.date.available | 2015-01-22T18:50:24Z | |
dc.date.issued | 2010-03 | |
dc.date.submitted | 2009-11 | |
dc.identifier.issn | 0004-6256 | |
dc.identifier.issn | 1538-3881 | |
dc.identifier.uri | http://hdl.handle.net/1721.1/93145 | |
dc.description.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 izJHK[subscript S] colors. Our spectroscopically selected sample has ~0.1 mag bluer median J – K[subscript S] color at a given spectral type (for L0-L4) than previously known L dwarfs, which reflects a bias toward redder L dwarfs in past selection criteria. We present photometric distance relations based on i – z and i – J 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 Hα detections for the fraction of our sample with sufficient quality spectra. Comparison of the velocities of our L dwarf sample to a kinematic model shows evidence for both cold and hot dynamical populations, consistent with young and old disk components. The dispersions of these components are similar to those found for M dwarfs. We also show that J – K[subscript S] color is correlated with velocity dispersion, confirming a relationship between J – K[subscript S] color and age. | en_US |
dc.description.sponsorship | National Science Foundation (U.S.) (Grant AST 06-07644) | en_US |
dc.language.iso | en_US | |
dc.publisher | IOP Publishing | en_US |
dc.relation.isversionof | http://dx.doi.org/10.1088/0004-6256/139/5/1808 | en_US |
dc.rights | Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. | en_US |
dc.source | American Astronomical Society | en_US |
dc.title | COLORS AND KINEMATICS OF L DWARFS FROM THE SLOAN DIGITAL SKY SURVEY | en_US |
dc.type | Article | en_US |
dc.identifier.citation | Schmidt, Sarah J., Andrew A. West, Suzanne L. Hawley, and J. Sebastian Pineda. “COLORS AND KINEMATICS OF L DWARFS FROM THE SLOAN DIGITAL SKY SURVEY.” The Astronomical Journal 139, no. 5 (March 23, 2010): 1808–1821. © 2010 The American Astronomical Society | en_US |
dc.contributor.department | MIT Kavli Institute for Astrophysics and Space Research | en_US |
dc.contributor.mitauthor | West, Andrew A. | en_US |
dc.contributor.mitauthor | Pineda, J. Sebastian | en_US |
dc.relation.journal | The Astronomical Journal | en_US |
dc.eprint.version | Final published version | en_US |
dc.type.uri | http://purl.org/eprint/type/JournalArticle | en_US |
eprint.status | http://purl.org/eprint/status/PeerReviewed | en_US |
dspace.orderedauthors | Schmidt, Sarah J.; West, Andrew A.; Hawley, Suzanne L.; Pineda, J. Sebastian | en_US |
mit.license | PUBLISHER_POLICY | en_US |
mit.metadata.status | Complete | |