Repository logo
 

Brown Dwarf Candidates in the JADES and CEERS Extragalactic Surveys

Published version
Peer-reviewed

Repository DOI


Change log

Abstract

jats:titleAbstract</jats:title> jats:pBy combining the James Webb Space Telescope (JWST)/NIRCam JADES and CEERS extragalactic data sets, we have uncovered a sample of 21 T and Y brown dwarf candidates at best-fit distances between 0.1 and 4.2 kpc. These sources were selected by targeting the blue 1–2.5 jats:italicμ</jats:italic>m colors and red 3–4.5 jats:italicμ</jats:italic>m colors that arise from molecular absorption in the atmospheres of jats:italicT</jats:italic> jats:subeff</jats:sub> < 1300 K brown dwarfs. We fit these sources using multiple models of substellar atmospheres and present the resulting fluxes, sizes, effective temperatures, and other derived properties for the sample. If confirmed, these fits place the majority of the sources in the Milky Way thick disk and halo. We observe proper motions for seven of the candidate brown dwarfs, with directions in agreement with the plane of our Galaxy, providing evidence that they are not extragalactic in nature. We demonstrate how the colors of these sources differ from selected high-redshift galaxies, and explore the selection of these sources in planned large-area JWST NIRCam surveys. Deep imaging with JWST/NIRCam presents an an excellent opportunity for finding and understanding these ultracool dwarfs at kiloparsec distances.</jats:p>

Description

Keywords

5101 Astronomical Sciences, 51 Physical Sciences

Journal Title

Astrophysical Journal

Conference Name

Journal ISSN

0004-637X
1538-4357

Volume Title

964

Publisher

American Astronomical Society
Sponsorship
European Research Council (695671)