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SUMMARY:Astrometric planet search around the faintest and the brightest st
 ars - Johannes Sahlmann (ESAC)
DTSTART:20140723T153000Z
DTEND:20140723T163000Z
UID:TALK53054@talks.cam.ac.uk
CONTACT:Dr B.-O. Demory
DESCRIPTION:Measuring the positions of nearby stars can inform us on the p
 resence and properties of extrasolar planets around them\, because planets
  induce an orbital reflex motion of the host star. I will first show resul
 ts from an ongoing astrometric planet search around very low-mass stars us
 ing an 8-metre optical telescope. For these faint targets\, we achieve 0.1
  milli-arcsecond precision\, which allows us to measure accurate distances
 \, to characterise elusive binaries\, and to identify promising planet can
 didates. Second\, I will discuss the potential for astrometric planet dete
 ction with ESA's Gaia mission and I will present a project that aims at ex
 ploiting this potential for the brightest stars in the sky.\n
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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