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Measuring the variability of directly imaged exoplanets using vector Apodizing Phase Plates combined with ground-based differential spectrophotometry
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Sutlieff, Ben J., Birkby, Jayne L., Stone, Jordan M., Doelman, David S., Kenworthy, Matthew A., Panwar, Vatsal, Bohn, Alexander J., Ertel, Steve, Snik, Frans, Woodward, Charles E., Skemer, Andrew J., Leisenring, Jarron M., Strassmeier, Klaus G. and Charbonneau, David (2023) Measuring the variability of directly imaged exoplanets using vector Apodizing Phase Plates combined with ground-based differential spectrophotometry. Monthly Notices of the Royal Astronomical Society, 520 (3). pp. 4235-4257. doi:10.1093/mnras/stad249 ISSN 1365-2966.
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Official URL: https://doi.org/10.1093/mnras/stad249
Abstract
Clouds and other features in exoplanet and brown dwarf atmospheres cause variations in brightness as they rotate in and out of view. Ground-based instruments reach the high contrasts and small inner working angles needed to monitor these faint companions, but their small fields of view lack simultaneous photometric references to correct for non-astrophysical variations. We present a novel approach for making ground-based light curves of directly imaged companions using high-cadence differential spectrophotometric monitoring, where the simultaneous reference is provided by a double-grating 360○ vector Apodizing Phase Plate (dgvAPP360) coronagraph. The dgvAPP360 enables high-contrast companion detections without blocking the host star, allowing it to be used as a simultaneous reference. To further reduce systematic noise, we emulate exoplanet transmission spectroscopy, where the light is spectrally dispersed and then recombined into white-light flux. We do this by combining the dgvAPP360 with the infrared Arizona Lenslets for Exoplanet Spectroscopy integral field spectrograph on the Large Binocular Telescope Interferometer. To demonstrate, we observed the red companion HD 1160 B (separation ∼780 mas) for one night, and detect
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
SWORD Depositor: | Library Publications Router | ||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
Publisher: | Oxford University Press (OUP) | ||||||||
ISSN: | 1365-2966 | ||||||||
Official Date: | April 2023 | ||||||||
Dates: |
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Volume: | 520 | ||||||||
Number: | 3 | ||||||||
Page Range: | pp. 4235-4257 | ||||||||
DOI: | 10.1093/mnras/stad249 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Reuse Statement (publisher, data, author rights): | ** Article version: AM ** From Crossref journal articles via Jisc Publications Router ** History: epub 24-01-2023; issued 24-01-2023. ** Licence for AM version of this article starting on 25-01-2023: https://creativecommons.org/licenses/by/4.0/ | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 12 June 2023 | ||||||||
Date of first compliant Open Access: | 12 June 2023 | ||||||||
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