SCExAO/CHARIS Near-infrared Integral Field Spectroscopy of the HD 15115 Debris Disk

Lawson, Kellen; Currie, Thayne; Wisniewski, John P.; Tamura, Motohide; Schneider, Glenn; Augereau, J.-C.; Brandt, Timothy D.; Guyon, Olivier; Kasdin, N. Jeremy; Groff, Tyler D.; Lozi, Julien; Chilcote, Jeffrey; Hodapp, Klaus W.; Jovanović, Nemanja; Martinache, Frantz; Skaf, Nour; Akiyama, Eiji; Henning, Thomas; Knapp, G. R.; Kwon, Jungmi; Mayama, Satoshi; McElwain, Michael W.; Sitko, Michael L.; Asensio-Torres, Rubén; Uyama, Taichi; Wagner, Kevin

doi:10.3847/1538-3881/ababa6

Cited by 25 publications

(53 citation statements)

References 55 publications

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“…It operates downstream of the AO188 system (Minowa et al 2010), which provides an initial, low-order correction to the incoming wavefront. The main WFS of SCExAO is a visible Pyramid wavefront with an operational wavelength range of 600-900 nm (Lozi et al 2019 In addition to enabling high-contrast science (e.g., Goebel et al 2018;Lawson et al 2020;Currie et al 2020a), SCExAO is serving as a technology demonstration testbed and it has tested many different FPWFSs on-sky (Martinache et al 2014;Martinache et al 2016;N'Diaye et al 2018;Bos et al 2019;Vievard et al 2019;.…”

Section: Scexaomentioning

confidence: 99%

First on-sky demonstration of spatial Linear Dark Field Control with the vector-Apodizing Phase Plate at Subaru/SCExAO

Bos

Miller

Lozi

et al. 2021

A&A

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Context. One of the key noise sources that currently limits high-contrast imaging observations for exoplanet detection is quasi-static speckles. Quasi-static speckles originate from slowly evolving non-common path aberrations (NCPA). These NCPA are related to the different optics encountered in the wavefront sensing path and the science path, and they also exhibit a chromatic component due to the difference in the wavelength between the science camera and the main wavefront sensor. These speckles degrade the contrast in the high-contrast region (or dark hole) generated by the coronagraph and make the calibration in post-processing more challenging. Aims. The purpose of this work is to present a proof-of-concept on-sky demonstration of spatial Linear Dark Field Control (LDFC). The ultimate goal of LDFC is to stabilize the point spread function (PSF) by addressing NCPA using the science image as additional wavefront sensor. Methods. We combined spatial LDFC with the Asymmetric Pupil vector-Apodizing Phase Plate (APvAPP) on the Subaru Coronagraphic Extreme Adaptive Optics system at the Subaru Telescope. To allow for rapid prototyping and easy interfacing with the instrument, LDFC was implemented in Python. This limited the speed of the correction loop to approximately 20 Hz. With the AP-vAPP, we derive a high-contrast reference image to be utilized by LDFC. LDFC is then deployed on-sky to stabilize the science image and maintain the high-contrast achieved in the reference image. Results. In this paper, we report the results of the first successful proof-of-principle LDFC on-sky tests. We present results from two types of cases: (1) correction of instrumental errors and atmospheric residuals plus artificially induced static aberrations introduced on the deformable mirror and (2) correction of only atmospheric residuals and instrumental aberrations. When introducing artificial static wavefront aberrations on the DM, we find that LDFC can improve the raw contrast by a factor of 3-7 over the dark hole. In these tests, the residual wavefront error decreased by ∼50 nm RMS, from ∼90 nm to ∼ 40 nm RMS. In the case with only residual atmospheric wavefront errors and instrumental aberrations, we show that LDFC is able to suppress evolving aberrations that have timescales of < 0.1-0.4 Hz. We find that the power at 10 −2 Hz is reduced by a factor of ∼20, 7, and 4 for spatial frequency bins at 2.5, 5.5, and 8.5 λ/D, respectively. Conclusions. We have identified multiplied challenges that have to be overcome before LDFC can become an integral part of science observations. The results presented in this work show that LDFC is a promising technique for enabling the high-contrast imaging goals of the upcoming generation of extremely large telescopes.

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Section: Scexaomentioning

confidence: 99%

First on-sky demonstration of spatial Linear Dark Field Control with the vector-Apodizing Phase Plate at Subaru/SCExAO

Bos

Miller

Lozi

et al. 2021

A&A

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“…SCExAO/CHARIS has yielded new discoveries of substellar companions, spectral characterization of known exoplanets and other objects, and multi-wavelength spatial characterization of planet-forming disks. [25][26][27][28][29][30] • VAMPIRES 31 , a dual-beam visible light imager, with polarization and spectral differential imaging modes, and aperture masking. SCExAO/VAMPIRES is used to resolve circumstellar material at small angular separations and can detect accreting protoplanets in H α .…”

Section: Scexao System Overviewmentioning

confidence: 99%

Validating advanced wavefront control techniques on the SCExAO testbed/instrument

Guyon

Lozi²,

Vievard

et al. 2020

Adaptive Optics Systems VII

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The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) serves both a science instrument in operation, and a prototyping platform for integrating and validating advanced wavefront control techniques. It provides a modular hardware and software environment optimized for flexible prototyping, reducing the time from concept * Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.

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“…Scattered-light imaging of debris disks can reveal and characterize signatures of planets responsible for shaping the disks' morphologies and help constrain the properties of the planets themselves (e.g., Kalas et al 2005;Lagrange et al 2010). "Extreme adaptive-optics" (exAO) facilities, such as SPHERE (Beuzit et al 2019), GPI (Macintosh et al 2015), and SCExAO (Jovanovic et al 2015;Lozi et al 2018;Currie et al 2020a), now deliver high-fidelity images of numerous debris disks at subarcsecond separations (e.g., Milli et al 2017;Duchêne et al 2020;Esposito et al 2020;Lawson et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Multiband Imaging of the HD 36546 Debris Disk: A Refined View from SCExAO/CHARIS*

Lawson

Currie

Wisniewski

et al. 2021

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We present the first multiwavelength (near-infrared; 1.1–2.4 μm) imaging of HD 36546's debris disk, using the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system coupled with the Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS). As a 3–10 Myr old star, HD 36546 presents a rare opportunity to study a debris disk at very early stages. SCExAO/CHARIS imagery resolves the disk over angular separations of ρ ∼ 0.″25–1.″0 (projected separations of rproj ∼ 25–101 au) and enables the first spectrophotometric analysis of the disk. The disk’s brightness appears symmetric between its eastern and western extents, and it exhibits slightly blue near-infrared colors on average (e.g., J−K = −0.4 ± 0.1)—suggesting copious submicron-sized or highly porous grains. Through detailed modeling adopting a Hong scattering phase function (SPF), instead of the more common Henyey–Greenstein function, and using the differential evolution optimization algorithm, we provide an updated schematic of HD 36546's disk. The disk has a shallow radial dust density profile (α in ≈ 1.0 and α out ≈ −1.5), a fiducial radius of r 0 ≈ 82.7 au, an inclination of i ≈ 79.°1, and a position angle of PA ≈ 80.°1. Through spine tracing, we find a spine that is consistent with our modeling, but also with a “swept-back wing” geometry. Finally, we provide constraints on companions, including limiting a companion responsible for a marginal Hipparcos–Gaia acceleration to a projected separation of ≲0.″2 and to a minimum mass of ≲11 M Jup.

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SCExAO/CHARIS Near-infrared Integral Field Spectroscopy of the HD 15115 Debris Disk

Cited by 25 publications

References 55 publications

First on-sky demonstration of spatial Linear Dark Field Control with the vector-Apodizing Phase Plate at Subaru/SCExAO

First on-sky demonstration of spatial Linear Dark Field Control with the vector-Apodizing Phase Plate at Subaru/SCExAO

Validating advanced wavefront control techniques on the SCExAO testbed/instrument

Multiband Imaging of the HD 36546 Debris Disk: A Refined View from SCExAO/CHARIS*

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