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VIP: Vortex Image Processing Package for High-contrast Direct Imaging
Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, Allee Six Aout 19c, B-4000 Liege, Belgium.
Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, Allee Six Aout 19c, B-4000 Liege, Belgium.
Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, Allee Six Aout 19c, B-4000 Liege, Belgium.
Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, Allee Six Aout 19c, B-4000 Liege, Belgium.; Univ Chile, Dept Astron, Santiago, Chile.; Millennium Nucleus Protoplanetary Disks, Santiago, Chile.
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2017 (English)In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 154, no 1, 7Article in journal (Refereed) Published
Abstract [en]

We present the Vortex Image Processing (VIP) library, a python package dedicated to astronomical high-contrast imaging. Our package relies on the extensive python stack of scientific libraries and aims to provide a flexible framework for high-contrast data and image processing. In this paper, we describe the capabilities of VIP related to processing image sequences acquired using the angular differential imaging (ADI) observing technique. VIP implements functionalities for building high-contrast data processing pipelines, encompassing pre- and post-processing algorithms, potential source. position and flux estimation, and sensitivity curve. generation. Among the reference point-spread. function subtraction techniques for ADI post-processing, VIP includes several flavors of principal component analysis (PCA) based algorithms, such as annular PCA and incremental PCA algorithms capable of processing big datacubes (of several gigabytes) on a computer with limited memory. Also, we present a novel ADI algorithm based on non-negative matrix factorization, which comes from the same family of low-rank matrix approximations as PCA and provides fairly similar results. We showcase the ADI capabilities of the VIP library using a deep sequence on HR 8799 taken with the LBTI/LMIRCam and its recently commissioned L-band vortex coronagraph. Using VIP, we investigated the presence of additional companions around HR 8799 and did not find any significant additional point source beyond the four known planets. VIP is available at http://github. com/vortex-exoplanet/VIP and is accompanied with Jupyter notebook tutorials illustrating the main functionalities of the library.

Place, publisher, year, edition, pages
2017. Vol. 154, no 1, 7
National Category
Engineering and Technology Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-298322DOI: 10.3847/1538-3881/aa73d7ISI: 000403478000002OAI: oai:DiVA.org:uu-298322DiVA: diva2:945644
Funder
EU, FP7, Seventh Framework Programme, 337569
Available from: 2016-07-01 Created: 2016-07-01 Last updated: 2017-09-14Bibliographically approved

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