High-contrast observations of brown dwarf companion HR 2562 B with the vector Apodizing Phase Plate coronagraph
Author
Sutlieff, B.J.Bohn, A.J.
Birkby, J.L.
Kenworthy, M.A.
Morzinski, K.M.
Doelman, D.S.
Males, J.R.
Snik, F.
Close, L.M.
Hinz, P.M.
Charbonneau, D.
Affiliation
Steward Observatory, University of ArizonaIssue Date
2021Keywords
brown dwarfsinfrared: planetary systems
instrumentation: high angular resolution
planets and satellites: atmospheres
planets and satellites: detection
stars: individual: HR 2562
Metadata
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Oxford University PressCitation
Sutlieff, B. J., Bohn, A. J., Birkby, J. L., Kenworthy, M. A., Morzinski, K. M., Doelman, D. S., Males, J. R., Snik, F., Close, L. M., Hinz, P. M., & Charbonneau, D. (2021). High-contrast observations of brown dwarf companion HR 2562 B with the vector Apodizing Phase Plate coronagraph. Monthly Notices of the Royal Astronomical Society, 506(3), 3224–3238.Rights
Copyright © The Author(s) 2021. Published by Oxford University Press on behalf of Royal Astronomical Society. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/).Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
The vector Apodizing Phase Plate (vAPP) is a class of pupil plane coronagraph that enables high-contrast imaging by modifying the Point Spread Function (PSF) to create a dark hole of deep flux suppression adjacent to the PSF core. Here, we recover the known brown dwarf HR 2562 B using a vAPP coronagraph, in conjunction with theMagellan Adaptive Optics (MagAO) system, at a signal-to-noise of S/N = 3.04 in the lesser studied L-band regime. The data contained a mix of field and pupil-stabilized observations, hence we explored three different processing techniques to extract the companion, including Flipped Differential Imaging (FDI), a newly devised Principal Component Analysis (PCA)-based method for vAPP data. Despite the partial fieldstabilization, the companion is recovered sufficiently to measure a 3.94 μm narrow-band contrast of (3.05 ± 1.00) × 10-4 (Δm3.94μm = 8.79±0.36 mag). Combined with archival GPI and SPHERE observations, our atmospheric modelling indicates a spectral type at the L/T transition with mass M = 29±15MJup, consistent with literature results. However, effective temperature and surface gravity vary significantly depending on the wavebands considered (1200 ≤ Teff(K) ≤ 1700 and 4.0 ≤ log(g)(dex) ≤ 5.0), reflecting the challenges of modelling objects at the L/T transition. Observations between 2.4 and 3.2 μm will be more effective in distinguishing cooler brown dwarfs due to the onset of absorption bands in this region. We explain that instrumental scattered light and wind-driven halo can be detrimental to FDI+PCA and thus must be sufficiently mitigated to use this processing technique. We thus demonstrate the potential of vAPP coronagraphs in the characterization of high-contrast substellar companions, even in sub-optimal conditions, and provide new complementary photometry of HR 2562 B. © 2021 The Author(s) 2021. Published by Oxford University Press on behalf of Royal Astronomical Society.Note
Open access articleISSN
0035-8711Version
Final published versionae974a485f413a2113503eed53cd6c53
10.1093/mnras/stab1893
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Except where otherwise noted, this item's license is described as Copyright © The Author(s) 2021. Published by Oxford University Press on behalf of Royal Astronomical Society. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/).