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| Paper: |
Searching for Ultra-cool Objects at the Limits of Large-scale Surveys |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
379 |
| Authors: |
Pinfield, D. J.; Patel, K.; Zhang, Z.; Gomes, J.; Burningham, B.; Day-Jones, A. C.; Jenkins, J. |
| Abstract: |
We have made a search (to Y=19.6) of the UKIDSS Large Area Survey
(LAS DR7) for objects detected only in the Y-band. We have identified
and removed contamination due to solar system objects, dust specs
in the WFCAM optical path, persistence in the WFCAM detectors, and
other sources of spurious single source Y-detections in the UKIDSS
LAS data-base. In addition to our automated selection procedure we
have visually inspected the ∼600 automatically selected candidates
to provide an additional level of quality filtering. This has resulted
in 55 good candidates that await follow-up observations to confirm their
nature. Ultra-cool LAS Y-only objects would have blue Y-J colours combined
with very red optical-NIR SEDs - characteristics shared by Jupiter, and
suggested by an extrapolation of the Y-J colour trend seen for the
latest T dwarfs currently known. |
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