@inproceedings{c5d01aa253914e33887fcdd68c51810c,
title = "The hunt for Sirius Ab: Comparison of algorithmic sky and PSF estimation performance in deep coronagraphic thermal-IR high contrast imaging",
abstract = "Despite promising astrometric signals, to date there has been no success in direct imaging of a hypothesized third member of the Sirius system. Using the Clio instrument and MagAO adaptive optics system on the Magellan Clay 6.5 m telescope, we have obtained extensive imagery of Sirius through a vector apodizing phase plate (vAPP) coronagraph in a narrowband filter at 3.9 microns. The vAPP coronagraph and MagAO allow us to be sensitive to planets much less massive than the limits set by previous non-detections. However, analysis of these data presents challenges due to the target's brightness and unique characteristics of the instrument. We present a comparison of dimensionality reduction techniques to construct background illumination maps for the whole detector using the areas of the detector that are not dominated by starlight. Additionally, we describe a procedure for sub-pixel alignment of vAPP data using a physical-optics-based model of the coronagraphic PSF.",
keywords = "background subtraction, high-contrast imaging, thermal infrared",
author = "Long, {Joseph D.} and Males, {Jared R.} and Morzinski, {Katie M.} and Close, {Laird M.} and Frans Snik and Kenworthy, {Matthew A.} and Otten, {Gilles P.P.L.} and John Monnier and Volker Tolls and Alycia Weinberger",
note = "Funding Information: Support for JRM to conduct these observations was provided, in part, under contract with the California Institute of Technology (Caltech)/Jet Propulsion Laboratory (JPL) funded by NASA through the Sagan Fellowship Program executed by the NASA Exoplanet Science Institute. KMM{\textquoteright}s and LMC{\textquoteright}s work is supported by the NASA Exoplanets Research Program (XRP) by cooperative agreement NNX16AD44G. Funding Information: This research was supported in part by NSF MRI Award #1625441 (MagAO-X). Publisher Copyright: {\textcopyright} 2018 SPIE.; Adaptive Optics Systems VI 2018 ; Conference date: 10-06-2018 Through 15-06-2018",
year = "2018",
doi = "10.1117/12.2312874",
language = "English (US)",
isbn = "9781510619593",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Dirk Schmidt and Laura Schreiber and Close, {Laird M.}",
booktitle = "Adaptive Optics Systems VI",
}