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Periodic Variability of the Brown Dwarf Kelu-1

  • F. J. Clarke (a1), C. G. Tinney (a2) and S. T. Hodgkin (a1)

Abstract

We present results of two observing campaigns aimed at characterising variability of the L2 brown dwarf Kelu-1. The first campaign in March 2000 detected photometric variability at the 1.2% level, with a strong period of 1.8 hours. Followup spectroscopic observations with the VLT in February 2002 show no evidence of significant variability in the dust sensitive molecular lines, but do show evidence for variability in the EW(Hα) with a period of 1.8 hours. Radial velocity measurements rule out a close substellar companion. Kelu-1 appears to be a single brown dwarf with a rotation period of 1.8 hours.

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References

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Allard, F., Hauschildt, P. H., Alexander, D. R., Tamanai, A. & Schweitzer, A. 2001, ApJ, 556, 357
Chabrier, G., Baraffe, I., Allard, F., & Hauschildt, P. 2000, ApJ, 542, 464
Clarke, F.J., Tinney, C.G., & Covey, K.R. 2002, MNRAS, 332, 361
Kirkpatrick, J. D., Dahn, C. C., Monet, D. G., Reid, I. N., Gizis, J. E., Liebert, J., Burgasser, A. J. 2001, AJ, 121, 3235

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