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Search for extrasolar planets with high-precision relative astrometry by ground-based and single-aperture observations

Published online by Cambridge University Press:  01 October 2007

Tristan Roell ,
Andreas Seifahrt  and
Ralph Neuhäuser
Tristan Roell
Affiliation:
Astrophysikalisches Institut und Universitäts-Sternwarte Jena, email: [email protected] email: [email protected]
Andreas Seifahrt
Affiliation:
Astrophysikalisches Institut und Universitäts-Sternwarte Jena, email: [email protected] email: [email protected] Institut für Astrophysik, Göttingen email: [email protected]
Ralph Neuhäuser
Affiliation:
Astrophysikalisches Institut und Universitäts-Sternwarte Jena, email: [email protected] email: [email protected]
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Abstract

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We present our search program for substellar companions using high-precision relative astronomy. Due to its orbital motion around the star, an unseen substellar companion would produce a periodic “wobble” of the host star, which is the astrometric signal of the unseen companion. By measuring the separation between the components of stellar double and triple systems, we want to measure this astrometric signal of a possible unseen companion indirectly as a relative and periodic change of these separations. Using a new observation mode (the “cube-mode”) where the frames were directly saved in cubes with nearly no loss of time during the readout, an adaptive optics system to correct for atmospheric noise and an infrared narrow band filter in the near infrared to suppress differential chromatic refraction (DCR) effects we achieve for our first target (the double star HD 19994) a relative precision for the separation measurements of about 100. . . 150μas per epoch. To reach a precision in the μas-regime, we use a statistical approach. We take several thousand frames per target and epoche and after a verification of a Gaussian distribution the measurement precision can be calculated as the standard deviation of our measurements divided by the square root of the number of Gaussian distributed measurements. Our first observed target is the stellar binary HD 19994 A & B, where the A component has a known radial velocity planet candidate.

Keywords

extrasolar planetsrelative astrometrydouble starstriple stars47 Tuccube-mode
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S249: Exoplanets: Detection, Formation and Dynamics , October 2007 , pp. 57 - 60
Copyright
Copyright © International Astronomical Union 2008

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