Hogan, E., Burleigh, M. R., Clarke, F. J.
The aim of the Degenerate Objects around Degenerate Objects (DODO) survey is to search for very low mass brown dwarfs and extrasolar planets in wide orbits around white dwarfs via direct imaging. The...
Burleigh, M. R., Clarke, F. J., Hogan, E., Brinkworth, C. S., Bergeron, P., Dufour, P., ...
We report limits in the planetary-mass regime for companions around the nearest single white dwarf to the Sun, van Maanen's star (vMa2), from deep J-band imaging with Gemini North and Spitzer...
Burleigh, M. R., Clarke, F. J., Hogan, E., Brinkworth, C. S., Bergeron, P., Dufour, P., ...
We report limits in the planetary-mass regime for companions around the nearest single white dwarf to the Sun, van Maanen's star (vMa 2), from deep J-band imaging with Gemini North and Spitzer IRAC...
A. Collier Cameron, F. M. Walter, O. Vilhu, T. Bohm, C. Catala, F. J. Clarke, ...
9, D.A. Jackson 1, E. Janot-Pacheco
Time resolved spectroscopy of the variable brown dwarf Kelu-1 (2003)
Clarke, F. J., Tinney, C. G., Hodgkin, S. T.
We report the results of observations designed to investigate the spectroscopic signatures of dust clouds on the L2 brown dwarf Kelu-1. Time resolved medium resolution spectra show no significant...
A mini-survey for variability in early L dwarfs (2002)
Clarke, F. J., Oppenheimer, B. R., Tinney, C. G.
We report differential I-band photometry of four early L-dwarfs obtained to study variability. We detect variability on the timescale of hours in two objects, 2M0746425+200032 (at a level of 0.007...
Imaging planets around nearby white dwarfs (2002)
Burleigh, M. R., Clarke, F. J., Hodgkin, S. T.
We suggest that Jovian planets will survive the late stages of stellar evolution, and that white dwarfs will retain planetary systems in wide orbits (>5AU). Utilising evolutionary models for Jovian...
Periodic photometric variability of the brown dwarf Kelu-1 (2002)
Clarke, F. J., Tinney, C. G., Covey, K. R.
We have detected a strong periodicity of 1.80+/-0.05 hours in photometric observations of the brown dwarf Kelu-1. The peak-to-peak amplitude of the variation is ~1.1% (11.9+/-0.8 mmag) in a 41nm wide...