New Techniques for High-Contrast Imaging with ADI: the ACORNS-ADI SEEDS Data Reduction Pipeline
Abstract
We describe Algorithms for Calibration, Optimized Registration, and Nulling the Star in Angular Differential Imaging (ACORNS-ADI), a new, parallelized software package to reduce high-contrast imaging data, and its application to data from the SEEDS survey. We implement several new algorithms, including a method to register saturated images, a trimmed mean for combining an image sequence that reduces noise by up to ~20%, and a robust and computationally fast method to compute the sensitivity of a high-contrast observation everywhere on the field-of-view without introducing artificial sources. We also include a description of image processing steps to remove electronic artifacts specific to Hawaii2-RG detectors like the one used for SEEDS, and a detailed analysis of the Locally Optimized Combination of Images (LOCI) algorithm commonly used to reduce high-contrast imaging data. ACORNS-ADI is written in python. It is efficient and open-source, and includes several optional features which may improve performance on data from other instruments. ACORNS-ADI requires minimal modification to reduce data from instruments other than HiCIAO. It is freely available for download at www.github.com/t-brandt/acorns-adi under a BSD license.
Keywords
Cite
@article{arxiv.1209.3014,
title = {New Techniques for High-Contrast Imaging with ADI: the ACORNS-ADI SEEDS Data Reduction Pipeline},
author = {Timothy D. Brandt and Michael W. McElwain and Edwin L. Turner and L. Abe and W. Brandner and J. Carson and S. Egner and M. Feldt and T. Golota and M. Goto and C. A. Grady and O. Guyon and J. Hashimoto and Y. Hayano and M. Hayashi and S. Hayashi and T. Henning and K. W. Hodapp and M. Ishii and M. Iye and M. Janson and R. Kandori and G. R. Knapp and T. Kudo and N. Kusakabe and M. Kuzuhara and J. Kwon and T. Matsuo and S. Miyama and J. -I. Morino and A. Moro-Martin and T. Nishimura and T. -S. Pyo and E. Serabyn and H. Suto and R. Suzuki and M. Takami and N. Takato and H. Terada and C. Thalmann and D. Tomono and M. Watanabe and J. P. Wisniewski and T. Yamada and H. Takami and T. Usuda and M. Tamura},
journal= {arXiv preprint arXiv:1209.3014},
year = {2015}
}
Comments
15 pages, 9 figures, accepted to ApJ. Replaced with accepted version; mostly minor changes. Software updated