A&A 426, 695-698 (2004)
DOI: 10.1051/0004-6361:20040384

Multi-order TODCOR: Application to observations taken with the CORALIE echelle spectrograph

II. A planet in the system HD 41004

S. Zucker¹, T. Mazeh², N. C. Santos^{1, 3}, S. Udry¹ and M. Mayor<sup>1

1</sup>  Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
    e-mail: Shay.Zucker@obs.unige.ch
²  School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
³  Centro de Astronomia e Astrofísica da Universidade de Lisboa, Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal

(Received 4 March 2004 / Accepted 17 June 2004)

Abstract
In previous works we reported the detection of a brown-dwarf companion orbiting the faint stellar component of the visual binary HD 41004 . This had been achieved by applying the multi-order TwO-Dimensional CORrelation (TODCOR) algorithm to CORALIE spectra. A long-term trend of the primary component had also been detected. In this paper we report follow-up observations that seem to unravel the nature of this long-term trend. The new measurements are consistent with the presence of a planet in an eccentric orbit around HD 41004 A . Thus, HD 41004 is a unique hierarchical system with a brown dwarf that accompanies the faint M-component, and a planet that orbits the brighter K-component.

Key words: methods: data analysis -- techniques: radial velocities -- stars: binaries: spectroscopic -- stars: individual: HD 41004   -- stars: low-mass, brown dwarfs

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© ESO 2004

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