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Ground based astrometric search for extrasolar planets in stellar multiple systems

Published online by Cambridge University Press:  15 February 2011

C. Turon ,
F. Meynadier ,
F. Arenou ,
T. Röll ,
A. Seifahrt ,
R. Neuhäuser ,
R. Köhler  and
J. Bean
T. Röll
Affiliation:
University Jena
A. Seifahrt
Affiliation:
UC Davis
R. Neuhäuser
Affiliation:
University Jena
R. Köhler
Affiliation:
LSW Heidelberg
J. Bean
Affiliation:
University Göttingen
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Abstract

Using relative astrometry and ground based imaging, we study nearby stellar multiple systems in order to detect the astrometric signal of exoplanets around one of the stellar components. We suppress differential chromatic refraction effects by observing in the near infrared with a narrow-band filter and by choosing an iterative calibration strategy (using a stellar cluster) we obtain a precision down to 100 μas in our relative astrometric measurements. This allows us to study the occurence and properties of exoplanets in nearby (less than 100 pc) stellar multiple systems.

While trying to detect the astrometric signal of the exoplanet orbiting HD19994 A (Mayor et al. 2004), we detected the astrometric signal of a further object around the B component. This astrometric detection is confirmed by speckle interferometry and follow-up radial velocity (RV) observations. Thus, HD19994 is an exoplanet host-triple system.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 45: GAIA: At the Frontiers of Astrometry , 2010 , pp. 429 - 432
Copyright
© EAS, EDP Sciences 2011

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References

Références

Kley, W., & Nelson, R.P., 2008, A&A, 486, 617
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Launhardt, R., 2009 [arXiv, 0904.1100]
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Neuhäuser, R., et al., 2007, A&A, 462, 777
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