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Probing the Bottom End of the IMF in Orion with Gemini

Published online by Cambridge University Press:  26 May 2016

Phil W. Lucas ,
Patrick F. Roche  and
Fiona C. Riddick
Phil W. Lucas
Affiliation:
Dept of Physical Sciences, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
Patrick F. Roche
Affiliation:
Astrophysics Dept., University of Oxford, 1 Keble Road, Oxford OX1 3RH
Fiona C. Riddick
Affiliation:
Astrophysics Dept., University of Oxford, 1 Keble Road, Oxford OX1 3RH

Abstract

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We present very deep JHK imaging of the Trapezium Cluster obtained with Gemini South/Flamingos and Gemini North/Hōkūpa'a. These images probe the IMF down to ˜ 2 MJup in a total area of ˜ 8 arcmin2. Several very faint new planetary mass candidates are detected and sources previously detected with UKIRT are verified. Photometry of 124 point sources in this field produces a Luminosity Function which drops to zero at K=18.75. Allowing for modest extinction this corresponds to a possible turn-down in the IMF near 5 Mjup. A minority of PMOs exhibit large K band excesses attributed to hot dust, confirming their extreme youth. Some of the faintest sources are associated with short trails of light of uncertain nature. These may provide a clue to the origin of PMOs, perhaps marking evacuated paths cleared by rapidly moving objects.

Type
Part 2. Observations of Recently Born Substellar Objects
Information
Symposium - International Astronomical Union , Volume 211: Brown Dwarfs , 2003 , pp. 63 - 66
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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