Johannes Sahlmann

Research Fellow


Main Research Fields

My main research interests are the observational study of extrasolar
planets and brown dwarfs (objects not massive enough to ignite
hydrogen fusion), in particular their discovery and characterisation
on the basis of optical/infrared observations with imaging,
spectroscopic, and interferometric instruments. I specialised in the
use of high-precision astrometry, that is the measurement of stellar
positions in the sky plane, obtained from a variety of instruments on
ground and in space. To make these measurements possible, I contribute
to new instruments and surveys and I develop techniques that push the
capabilities of existing facilities.


  • Extrasolar planets
  • Brown dwarfs
  • Binary stars
  • Astrometry
  • Astronomical instrumentation

Ongoing collaborations

Incomplete list of collaborations

  • P. Lazorenko (Kyiv, Ukraine)
  • D. Segransan, S. Udry, M. Mayor, B. Holl, D.V. Martin (Geneva, Switzerland)
  • Gaia SOC (ESAC Madrid, Spain)
  • D. Queloz, A. Triaud (Cambridge, UK)
  • H. Bouy, E. L. Martin, M. R. Zapatero Osorio (CAB Madrid, Spain)
  • A. Burgasser, D. Bardalez Gagliuffi (UC San Diego, USA)
  • T. Dupuy (UT Austin, USA)
  • R. I. Anderson (JHU Baltimore, USA)
  • J. Kajava (ESAC Madrid, Spain)

Project/mission at ESA

  • Gaia
  • HST

Research homepage