Detecting outer planets in edge-on orbits: Combining radial velocity and astrometric techniques

J. A. Eisner, S. R. Kulkarni

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The astrometric and radial velocity techniques of extrasolar planet detection attempt to detect the periodic reflex motion of the parent star by extracting this periodic signal from a time-sampled set of observations. The extraction is generally accomplished using periodogram analysis or the functionally equivalent technique of least-squares fitting of sinusoids. In this paper, we use a frequentist approach to examine the sensitivity of the least-squares technique when applied to a combination of radial velocity and astrometric observations. We derive an analytical expression for the sensitivity and show that the combined approach yields significantly better sensitivity than either technique on its own. We discuss the ramifications of this result to upcoming astrometric surveys with the Full-Sky Astrometric Mapping Explorer, the Keck Interferometer, and the Space Interferometry Mission.

Original languageEnglish (US)
Pages (from-to)426-429
Number of pages4
JournalAstrophysical Journal
Issue number1 I
StatePublished - Jul 20 2002


  • Astrometry
  • Planetary systems
  • Techniques: radial velocities

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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