Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.4903b&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #49.03; Bulletin of the American Astronomical Society, Vol. 33, p.854
Astronomy and Astrophysics
Astronomy
Scientific paper
To date, seventeen T dwarfs, brown dwarfs exhibiting CH4 absorption features in the near-infrared, have been identified in the 2MASS point source catalog. In this talk, I highlight two unusual discoveries, 2MASS 1237+6526 and 2MASS 0937+2931. The former object shows H alpha in emission (as first reported in Burgasser et al. 2000), contrary to activity trends seen in warmer L dwarfs and T dwarfs. We present observations showing that this emission is stable, and constraints on a possible interacting binary are made based on monitoring observations. The latter object is the bluest T dwarf so far identified, with J-Ks = -0.89, due to a highly suppressed K-band peak. We discuss how high gravity or low metallicity may be the source of this feature, and argue that the importance of H2 collision-induced absorption and the absence of dust in the cool photospheres of T dwarfs allow us to perceive these effects.
2MASS Rare Objects Team
Burgasser Adam Jonathan
No associations
LandOfFree
Unusual T dwarfs Discovered by 2MASS does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Unusual T dwarfs Discovered by 2MASS, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Unusual T dwarfs Discovered by 2MASS will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1269408