Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-05
Mon.Not.Roy.Astron.Soc.374:372,2007
Astronomy and Astrophysics
Astrophysics
14 pages, 9 figures, 7 tables, 2 appendices; accepted to MNRAS
Scientific paper
10.1111/j.1365-2966.2006.11151.x
We present first results from a deep (J = 18.7), wide-field (6.5 square degrees) infrared (ZYJHK) survey in the Upper Sco association conducted within the science verification phase of the UKIRT Infrared Deep Sky Survey Galactic Cluster Survey (GCS). Cluster members define a sequence well separated from field stars in the (Z-J,Z) colour-magnitude diagram. We have selected a total of 164 candidates with J = 10.5-18.7 mag from the (Z-J,Z) and (Y-J,Y) diagrams. We further investigated the location of those candidates in the other colour-magnitude and colour-colour diagrams to weed out contaminants. The cross-correlation of the GCS catalogue with the 2MASS database confirms the membership of 116 photometric candidates down to 20 Jupiter masses as they lie within a 2 sigma circle centred on the association mean motion. The final list of cluster members contains 129 sources with masses between 0.3 and 0.007 Msun. We extracted a dozen new low-mass brown dwarfs below 20 Mjup, the limit of previous surveys in the region. Finally, we have derived the mass function in Upper Sco over the 0.3-0.01 Msun mass range, best fit by a single segment with a slope of index alpha = 0.6+/-0.1, in agreement with previous determination in open clusters.
Carraro Giovanni
Hambly Nigel C.
Hodgkin Simon T.
Jameson Richard F.
Kendall Tim R.
No associations
LandOfFree
New brown dwarfs in Upper Sco using UKIDSS Galactic Cluster Survey science verification data 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 New brown dwarfs in Upper Sco using UKIDSS Galactic Cluster Survey science verification data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New brown dwarfs in Upper Sco using UKIDSS Galactic Cluster Survey science verification data will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-655434