IRAC Photometry of 400-800K Brown Dwarfs

Details IRAC Photometry of 400-800K Brown Dwarfs IRAC Photometry of 400-800K Brown Dwarfs

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70058l&link_type=abstract

Spitzer Proposal ID #70058

Computer Science

Scientific paper

Spitzer data, including warm-IRAC [3.6] and [4.5] photometry, is critical for understanding the cold population of brown dwarfs now being found, objects which have more in common with planets than stars. As effective temperature drops from 800K to 400K, the fraction of flux emitted beyond 3um increases rapidly, from about 40% to >75%. This rapid increase makes a color like H-[4.5] a very sensitive temperature indicator, and it can be combined with a gravity- and metallicity-sensitive color like H-K to constrain all three of these fundamental properties, which in turn gives us mass and age for these, generally isolated, slowly cooling objects. Our goal is to accurately characterise the temperature/ gravity/ metallicity distribution of the coolest brown dwarfs being found in the UKIRT Infrared Deep Sky Survey, which is only possible if Spitzer photometry is available to complement our near- infrared data. At the same time we will define color trends which will allow better exploitation of the WISE mission by the community. We expect to find and spectroscopically confirm several new 400 - 800K brown dwarfs during Cycle 7, and possibly even cooler nearby objects (based on our recent discovery of a 400K object at a distance of only 3pc). Extrapolating from our current sample, we expect to trigger around eleven low-impact ToO observations during Cycle 7, totalling 9.9 hours of AORs.

Affiliated with

Also associated with

No associations

Rating

IRAC Photometry of 400-800K Brown Dwarfs 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 IRAC Photometry of 400-800K Brown Dwarfs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and IRAC Photometry of 400-800K Brown Dwarfs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1598097