The SCExAO high contrast imager: transitioning from commissioning to science

Jovanović, Nemanja; Guyon, Olivier; Lozi, Julien; Currie, Thayne; Hagelberg, J.; Norris, Barnaby; Singh, Garima; Pathak, Prashant; Doughty, D.; Goebel, Sean; Males, Jared R.; Kuhn, J. R.; Serabyn, Eugene; Tuthill, P. G.; Schworer, Guillaume; Martinache, Frantz; Kudo, Tomoyuki; Kawahara, Hiroyuki; Kotani, Takayuki; Ireland, Michael; Feger, Tobias; Rains, Adam D.; Bento, J.; Schwab, Christian; Coutts, David W.; Cvetojevic, Nick; Gross, Simon; Arriola, Alexander; Lagadec, Tiphaine; Kasdin, Jeremy; Groff, Tyler D.; Mazin, Benjamin A.; Minowa, Yosuke; Takato, Naruhisa; Tamura, Motohide; Takami, Hideki; Hayashi, Masahiko

doi:10.1117/12.2234294

Cited by 16 publications

(9 citation statements)

References 18 publications

(14 reference statements)

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“…Some initial studies have been done on wind measurement from GPI telemetry 24 and predictive Fourier control is being tested at ShaneAO, 25 but neither has been implemented on GPI. Several high contrast systems operate or have planned upgrades to operate at > 1 kHz, [26][27][28][29] to clear advantage with respect to lag errors. Additionally, GPI's WFS detector noise limits the system to guide stars of I < 10.…”

Section: Discussionmentioning

confidence: 99%

Status and performance of the Gemini Planet Imager adaptive optics system

Bailey

Poyneer

Macintosh

et al. 2016

Adaptive Optics Systems V

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The Gemini Planet Imager is a high-contrast near-infrared instrument specifically designed to image exoplanets and circumstellar disks over a narrow field of view. We use science data and AO telemetry taken during the first 1.5 yr of the GPI Exoplanet Survey to quantify the performance of the AO system. In a typical 60 sec H-band exposure, GPI achieves a 5σ raw contrast of 10 −4 at 0.4"; typical final 5σ contrasts for full 1 hr sequences are more than 10 times better than raw contrasts. We find that contrast is limited by bandwidth wavefront error over much of the PSF. Preliminary exploratory factor analysis can explain 60-70% of the variance in raw contrasts with combinations of seeing and wavefront error metrics. We also examine the effect of higher loop gains on contrast by comparing wavefront error maps reconstructed from AO telemetry to concurrent IFS images. These results point to several ways that GPI performance could be improved in software or hardware.

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Section: Discussionmentioning

confidence: 99%

Status and performance of the Gemini Planet Imager adaptive optics system

Bailey

Poyneer

Macintosh

et al. 2016

Adaptive Optics Systems V

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“…Following a successful 2016 July engineering run where SCExAO achieved H-band Strehl ratios of ∼80% on sky (Jovanovic et al 2016), we targeted the star during the following run, on 2016 October 15, also in H band using the HiCIAO infrared camera and the vector vortex coronagraph (J. Kuhn et al 2017, in preparation) and in angular differential imaging mode (Marois et al 2006).…”

Section: Scexao Observations and Data Reductionmentioning

confidence: 99%

Subaru/SCExAO First-light Direct Imaging of a Young Debris Disk around HD 36546

Currie

Guyon

Tamura

et al. 2017

ApJL

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We present H-band scattered light imaging of a bright debris disk around the A0 star HD 36546 obtained from the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system with data recorded by the HiCIAO camera using the vector vortex coronagraph. SCExAO traces the disk from r∼0 3 to r∼1″ (34-114 au). The disk is oriented in a near east-west direction (PA∼75°), is inclined by i∼70°-75°, and is strongly forward-scattering (g>0.5). It is an extended disk rather than a sharp ring; a second, diffuse dust population extends from the disk's eastern side. While HD 36546 intrinsic properties are consistent with a wide age range (t∼1-250 Myr), its kinematics and analysis of coeval stars suggest a young age (3-10 Myr) and a possible connection to TaurusAuriga's star formation history. SCExAO's planet-to-star contrast ratios are comparable to the first-light Gemini Planet Imager contrasts; for an age of 10 Myr, we rule out planets with masses comparable to HR 8799 b beyond a projected separation of 23 au. A massive icy planetesimal disk or an unseen super-Jovian planet at r>20 au may explain the disk's visibility. The HD 36546 debris disk may be the youngest debris disk yet imaged, is the first newly identified object from the now-operational SCExAO extreme AO system, is ideally suited for spectroscopic follow-up with SCExAO/CHARIS in 2017, and may be a key probe of icy planet formation and planet-disk interactions.

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“…at SCExAO. 67 We aim to expand this review and submit it as part of a series of publications to JATIS. We will then also update all the references to 2018 SPIE papers.…”

Section: Discussionmentioning

confidence: 99%

Review of high-contrast imaging systems for current and future ground-based and space-based telescopes III: technology opportunities and pathways

Snik

Absil

Baudoz

et al. 2018

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III

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The Optimal Optical Coronagraph Workshop at the Lorentz Center in September 2017 in Leiden, the Netherlands gathered a diverse group of 25 researchers working on exoplanet instrumentation to stimulate the emergence and sharing of new ideas. This contribution is the final part of a series of three papers summarizing the outcomes of the workshop, and presents an overview of novel optical technologies and systems that are implemented or considered for high-contrast imaging instruments on both ground-based and space telescopes. The overall objective of high contrast instruments is to provide direct observations and characterizations of exoplanets at contrast levels as extreme as 10 −10 . We list shortcomings of current technologies, and identify opportunities and development paths for new technologies that enable quantum leaps in performance. Specifically, we discuss the design and manufacturing of key components like advanced deformable mirrors and coronagraphic optics, and their amalgamation in "adaptive coronagraph" systems. Moreover, we discuss highly integrated system designs that combine contrast-enhancing techniques and characterization techniques (like high-resolution spectroscopy) while minimizing the overall complexity. Finally, we explore extreme implementations using all-photonics solutions for ground-based telescopes and dedicated huge apertures for space telescopes.

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The SCExAO high contrast imager: transitioning from commissioning to science

Cited by 16 publications

References 18 publications

Status and performance of the Gemini Planet Imager adaptive optics system

Status and performance of the Gemini Planet Imager adaptive optics system

Subaru/SCExAO First-light Direct Imaging of a Young Debris Disk around HD 36546

Review of high-contrast imaging systems for current and future ground-based and space-based telescopes III: technology opportunities and pathways

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