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High-contrast imaging of tight resolved binaries with two vector vortex coronagraphs in cascade with the Palomar SDC instrument

Kühn, Jonas and Daemgen, Sebastian and Wang, Ji and Morales, Farisa and Bottom, Michael and Serabyn, Eugene and Shelton, Jean C. and Delorme, Jacques-Robert and Tinyanont, Samaporn (2018) High-contrast imaging of tight resolved binaries with two vector vortex coronagraphs in cascade with the Palomar SDC instrument. In: Ground-based and Airborne Instrumentation for Astronomy VII. Proceedings of SPIE. No.10702. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 1070242. ISBN 9781510619579.

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More than half of the stars in the solar neighborhood reside in binary/multiple stellar systems, and recent studies suggest that gas giant planets may be more abundant around binaries than single stars. Yet, these multiple systems are usually overlooked or discarded in most direct imaging surveys, as they prove difficult to image at high-contrast using coronographs. This is particularly the case for compact binaries (less than 1’’ angular separation) with similar stellar magnitudes, where no existing coronagraph can provide high-contrast regime. Here we present preliminary results of an on-going Palomar pilot survey searching for low-mass companions around ~15 young “challenging” binary systems, with angular separation as close as 0’’3 and near-equal K-band magnitudes. We use the Stellar Double Coronagraph (SDC) instrument on the 200-inch Telescope in a modified optical configuration, making it possible to align any targeted binary system behind two vector vortex coronagraphs in cascade. This approach is uniquely possible at Palomar, thanks to the absence of sky rotation combined with the availability of an extreme AO system, and the number of intermediate focalplanes provided by the SDC instrument. Finally, we expose our current data reduction strategy, and we attempt to quantify the exact contrast gain parameter space of our approach, based on our latest observing runs.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Wang, Ji0000-0002-4361-8885
Morales, Farisa0000-0001-9414-3851
Bottom, Michael0000-0003-1341-5531
Shelton, Jean C.0000-0001-8982-1654
Tinyanont, Samaporn0000-0002-1481-4676
Additional Information:© 2018 Society of Photo-optical Instrumentation Engineers (SPIE). The authors would like to thank the Palomar Observatory day-and night-time staff for the tremendous support, particularly Rick Buruss for the initial proof-of-feasibility AO tests. JK is being funded by the Swiss National Science Foundation (SNSF) through Ambizione grant #PZ00P2_154800, and also acknowledge the Institute of Particle Physics and Astrophysics of ETH Zurich and Prof. H. M. Schmid for the observing travel support. Part of this work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration (NASA). The data presented in this paper are based on observations obtained at the Hale Telescope, Palomar Observatory, as part of a continuing collaboration between Caltech, NASA/JPL, and Cornell University.
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)PZ00P2_154800
Subject Keywords:Direct imaging, high-contrast, coronagraphy, binary stars, multiple stars systems, stellar multiplicity, vector vortex coronagraph
Series Name:Proceedings of SPIE
Issue or Number:10702
Record Number:CaltechAUTHORS:20190108-095145206
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Official Citation:Jonas Kühn, Sebastian Daemgen, Ji Wang, Farisa Morales, Michael Bottom, Eugene Serabyn, Jean C. Shelton, Jacques-Robert Delorme, Samaporn Tinyanont, "High-contrast imaging of tight resolved binaries with two vector vortex coronagraphs in cascade with the Palomar SDC instrument," Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070242 (27 July 2018); doi: 10.1117/12.2313448
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92132
Deposited By: Tony Diaz
Deposited On:08 Jan 2019 21:04
Last Modified:16 Nov 2021 03:47

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