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28 July 2008 First step to detect an extrasolar planet using simultaneous observations with the two VLTI instruments AMBER and MIDI
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Abstract
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.
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A. Matter, W. Jaffe, M. Vannier, S. Morel, S. Lagarde, B. Lopez, F. Rantakyrö, T. Rivinius, R. G. Petrov, and C. Leinert "First step to detect an extrasolar planet using simultaneous observations with the two VLTI instruments AMBER and MIDI", Proc. SPIE 7013, Optical and Infrared Interferometry, 701341 (28 July 2008); doi: 10.1117/12.789368; https://doi.org/10.1117/12.789368
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