Multi-order TODCOR: application to observations taken with the CORALIE echelle spectrograph I. The system HD 41004 ⋆,⋆⋆

This paper presents an application of the TwO-Dimensional CORrelation (TODCOR) algorithm to multi-order spec- tra. The combination of many orders enables the detection and measurement of the radial velocities of very faint companions. The technique is first applied here to the case of HD 41004, where the secondary is 3:68 mag fainter than the primary in the V band. When applied to CORALIE spectra of this system, the technique measures the secondary velocities with a precision of 0: 6k m s 1 and facilitates an orbital solution of the HD 41004 B subsystem. The orbit of HD 41004 B is nearly circular, with a companion of a 19 MJ minimum mass. The precision achieved for the primary is 10 m s 1 , allowing the measurement of a long-term trend in the velocities of HD 41004 A.

[1]  A. Pickles.  A Stellar Spectral Flux Library: 1150–25000 Å , 1998 .

[2]  M. Mayor,et al.  Binaries as Tracers of Stellar Formation , 2005 .

[3]  S. Zucker,et al.  Todcor: A TwO-Dimensional CORrelation technique to analyze stellar spectra in search of faint companions , 1994 .

[4]  T. Guillot,et al.  A Nongray Theory of Extrasolar Giant Planets and Brown Dwarfs , 1997, astro-ph/9705201.

[5]  D. F. Gray,et al.  The Observation and Analysis of Stellar Photospheres , 2021 .

[6]  T. Mazeh,et al.  On the Orbital Circularization of Close Binaries , 1991 .

[7]  Wolfgang Voges,et al.  THE ROSAT ALL-SKY SURVEY CATALOGUE OF THE NEARBY STARS , 1999 .

[8]  L. B. Lucy,et al.  Spectroscopic binaries with circular orbits , 1973 .

[9]  P. Goldreich,et al.  Solar seismology. I - The stability of the solar p-modes , 1977 .

[10]  Tsevi Mazeh,et al.  STUDY OF SPECTROSCOPIC BINARIES WITH TODCOR. I: A NEW TWO-DIMENSIONAL CORRELATION ALGORITHM TO DERIVE THE RADIAL VELOCITIES OF THE TWO COMPONENTS , 1994 .

[11]  T. Guillot,et al.  Giant Planets at Small Orbital Distances , 1995, astro-ph/9511109.

[12]  J. Tonry,et al.  A survey of galaxy redshifts. I. Data reduction techniques. , 1979 .

[13]  Tidal decay of close planetary orbits , 1996, astro-ph/9605059.

[14]  S. Zucker,et al.  The Smallest Mass Ratio Young Star Spectroscopic Binaries , 2001, astro-ph/0201324.

[15]  European Southern Observatory,et al.  The CORALIE survey for southern extra-solar planets - IX. A 1.3-day period brown dwarf disguised as a planet , 2002 .

[16]  The metal-rich nature of stars with planets , 2001, astro-ph/0105216.

[17]  I. Baraffe,et al.  Theory of Low-Mass Stars and Substellar Objects , 2000 .

[18]  S. Zucker,et al.  Infrared Detection of Low-Mass Secondaries in Spectroscopic Binaries , 2002 .