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Title:
Search for cool extrasolar giant planets combining coronagraphy, spectral and angular differential imaging
Authors:
Maire, Anne-Lise; Boccaletti, Anthony; Rameau, Julien; Chauvin, Gaël; Lagrange, Anne-Marie; Bonnefoy, Mickaël; Desidera, Silvano; Sylvestre, Mélody; Baudoz, Pierre; Galicher, Raphaël; Mouillet, David
Affiliation:
AA(LUTH, Obs. Paris/CNRS/Univ. Paris 7, 92195 Meudon, France ), AB(LESIA, Obs. Paris/CNRS/Univ. Paris 6/Univ. Paris 7, 92195 Meudon, France), AC(Institut de Planétologie et d'Astrophysique de Grenoble, University Joseph Fourier/CNRS, 38041 Grenoble, France), AD(Institut de Planétologie et d'Astrophysique de Grenoble, University Joseph Fourier/CNRS, 38041 Grenoble, France), AE(Institut de Planétologie et d'Astrophysique de Grenoble, University Joseph Fourier/CNRS, 38041 Grenoble, France), AF(Max Planck Institute for Astronomy, D-69117 Heidelberg, Germany), AG(INAF - Osservatorio Astronomico di Padova, I-35122 Padova, Italy), AH(LESIA, Obs. Paris/CNRS/Univ. Paris 6/Univ. Paris 7, 92195 Meudon, France), AI(LESIA, Obs. Paris/CNRS/Univ. Paris 6/Univ. Paris 7, 92195 Meudon, France), AJ(LESIA, Obs. Paris/CNRS/Univ. Paris 6/Univ. Paris 7, 92195 Meudon, France), AK(Institut de Planétologie et d'Astrophysique de Grenoble, University Joseph Fourier/CNRS, 38041 Grenoble, France)
Publication:
Exploring the Formation and Evolution of Planetary Systems, Proceedings of the International Astronomical Union, IAU Symposium, Volume 299, pp. 21-25
Publication Date:
01/2014
Origin:
CUP
Keywords:
Planetary systems, techniques: high angular resolution, techniques: image processing,
Abstract Copyright:
(c) 2014: Copyright © International Astronomical Union 2013
DOI:
10.1017/S1743921313007692
Bibliographic Code:
2014IAUS..299...21M

Abstract

Spectral differential imaging (SDI) is part of the observing strategy of current and on-going high-contrast imaging instruments on ground-based telescopes. Although it improves the star light rejection, SDI attenuates the signature of off-axis companions to the star, just like angular differential imaging (ADI). However, the attenuation due to SDI has the peculiarity of being dependent on the spectral properties of the companions. To date, no study has investigated these effects. Our team is addressing this problem based on data from a direct imaging survey of 16 stars combining the phase-mask coronagraph, the SDI and the ADI modes of VLT/NaCo. The objective of the survey is to search for cool (Teff<1000-1300 K) giant planets at separations of 5-10 AU orbiting young, nearby stars (<200 Myr, <25 pc). The data analysis did not yield any detections. As for the estimation of the sensivity limits of SDI-processed images, we show that it requires a different analysis than that used in ADI-based surveys. Based on a method using the flux predictions of evolutionary models and avoiding the estimation of contrast, we determine directly the mass sensivity limits of the survey for the ADI processing alone and with the combination of SDI and ADI. We show that SDI does not systematically improve the sensitivity due to the spectral properties and self-subtraction of point sources.

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