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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421553.0, MPI für Astronomie / Publikationen_mpia
First step to detect an extrasolar planet using simultaneous observations with the two VLTI instruments AMBER and MIDI
Authors:Matter, A.; Jaffe, W.; Vannier, M.; Morel, S.; Lagarde, S.; Lopez, B.; Rantakyrö, F.; Rivinius, T.; Petrov, R. G.; Leinert, C.
Date of Publication (YYYY-MM-DD):2008
Title of Proceedings:Optical and Infrared Interferometry
Start Page:701341-701341
End Page:10
Volume (in Series):7013
Name of Conference/Meeting:Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
Audience:Not Specified
Abstract / Description:Performed in November 2007 as a part of the MIDI Guaranteed Time Observation exoplanet program, the observation of the hot Jupiter-like exoplanet Gliese 86b constituted the first attempt of exoplanet detection with the VLTI instrument MIDI. It is also a technical achievement as the first VLTI observation using AMBER and MIDI simultaneously. Fringes were obtained for both instruments with the aim to correct the phase in N-band from the dispersion using the fringes in K-band. In N-band, the parent star has an estimated magnitude of 3.8, and a flux ratio planet/star of about 10-3 is expected. After simulating the effect of the data reduction process of MIDI (EWS), it appears that the theoretical interferometric phase spectrum is a curved-like function with an amplitude (that we call arrow) of about 0.05°. According to the phase spectra of the calibrator HD9362, taken during the first night of observation, we estimate that a precision on the curvature measurement of about 0.33° is currently reached. Consequently, we are at least at a factor 6 from a possible detection. The AMBER data, obtained in parallel, were too noisy to be used to extrapolate and remove the corresponding dispersion in N band at the required level of precision.
Comment of the Author/Creator:Date: 2008, July 1, 2008
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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