Brown Dwarf Candidates in the JADES and CEERS Extragalactic Surveys

2023/09/06 by Kevin Hainline, Kevin N. Hainline, Jakob M. Helton +32 · 2 voices · 6 citations
Physics and Astronomy · #Galaxies: Formation, Evolution, Phenomena #Astronomy and Astrophysical Research #Stellar, planetary, and galactic studies

paper · pdf · doi:10.48550/arxiv.2309.03250

Abstract

By combining the JWST/NIRCam JADES and CEERS extragalactic datasets, we have uncovered a sample of twenty-one T and Y brown dwarf candidates at best-fit distances between 0.1 - 4.2 kpc. These sources were selected by targeting the blue 1μm - 2.5μm colors and red 3μm - 4.5μm colors that arise from molecular absorption in the atmospheres of T_eff < 1300K brown dwarfs. We fit these sources using multiple models of low-mass stellar 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 motion 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 very cold low-mass stars at kpc distances.

Cited by

• JADES: An Abundance of Ultra-Distant T- and Y-Dwarfs in Deep Extragalactic Data
• JWST Advanced Deep Extragalactic Survey (JADES) Data Release 5: Photometrically Selected Galaxy Candidates at z > 8
• A search for late-type brown dwarfs in the Euclid Quick Data Release 1
• Discovery of Seven Cold and Distant Brown Dwarfs with JWST RUBIES
• A Large Sample of JWST/NIRSpec Brown Dwarfs: New Distant Discoveries
• JADES-GS-z14-1: A Compact, Faint Galaxy at z≈14 with Weak Metal Lines from Extremely Deep JWST MIRI, NIRCam, and NIRSpec Observations

Discussions

• This is from my paper: arxiv.org/abs/2309.03250 It was accepted today to ApJ, so I’m gonna put the accepted version up on the arxiv tomorrow, most notably with the update I mentioned on twitter. [bsky, 17 points, 2 comments]
• Oh hey, @philplait.bsky.social discusses our NIRCam paper led by @kevinhainline.bsky.social on distant Brown Dwarfs, which were discovered in the JADES and CEERS deep fields! Given their location in [bsky, 4 points, 1 comments]

Related

• JADES: An Abundance of Ultra-Distant T- and Y-Dwarfs in Deep Extragalactic Data
• JADES: Spectroscopic Confirmation and Proper Motion for a T-Dwarf at 2 Kiloparsecs
• Three Brown Dwarfs Masquerading as High-Redshift Galaxies in JWST Observations
• Brown dwarf number density in the JWST COSMOS-Web field
• A Large Sample of JWST/NIRSpec Brown Dwarfs: New Distant Discoveries