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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308836.0, MPI für Astronomie / Publikationen_mpia
Contrast limits with the Simultaneous Differential Extrasolar Planet Imager (SDI) at the VLT and MMT
Authors:Biller, B. A.; Close, L. M.; Masciadri, E.; Lenzen, R.; Brandner, W.; McCarthy, D.; Henning, T.; Nielsen, E. L.; Hartung, M.; Kellner, S.; Geissler, K.; Kasper, M.
Date of Publication (YYYY-MM-DD):2006
Title of Proceedings:Advances in Adaptive Optics II
Start Page:62722D-1
End Page:10
Title of Series:SPIE
Volume (in Series):6272
Name of Conference/Meeting:Advances in Adaptive Optics II
Audience:Not Specified
Abstract / Description:We discuss contrast limits obtained during a survey of young (<300 Myr), close (<50 pc) stars with the Simultaneous Differential Extrasolar Planet Imager (SDI) implemented at the VLT and the MMT. SDI uses a double Wollaston prism and a quad filter to take images simultaneously at 3 wavelengths surrounding the 1.62 mum methane bandhead found in the spectrum of cool brown dwarfs and gas giants. By performing a difference of images in these filters, speckle noise from the primary can be significantly attenuated, resulting in photon noise limited data. In our survey data, we achieved H band contrasts >25000 (5sigma DeltaF1(1.575mum)>10 mag, DeltaH>10.6 mag for a T6 spectral type) at a separation of 0.5" from the primary star. With this degree of attenuation, we can image (5sigma detection) a 2-4 Jupiter mass planet at 5 AU around a 30 Myr star at 10 pc. We are currently completing our survey of young, nearby stars. We have obtained complete datasets for 40 stars in the southern sky (VLT) and 11 stars in the northern sky (MMT). We believe that our SDI images are the highest contrast astronomical images ever made from ground or space for methane rich companions.
Comment of the Author/Creator:Date: 2006, July 1, 2006
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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