Lessons for WFIRST CGI from ground-based high-contrast systems

Bailey, Vanessa P.; Bottom, Michael; Cady, Eric; Cantalloube, F.; Boer, J. de; Groff, Tyler D.; Krist, John; Millar‐Blanchaer, Maxwell A.; Vigan, A.; Chilcote, Jeffrey; Choquet, Élodie; Rosa, Robert J. De; Girard, J.; Guyon, Olivier; Kern, Brian; Lagrange, Anne-Marie; Macintosh, Bruce; Males, Jared R.; Marois, Christian; Meshkat, Tiffany; Milli, J.; N’Diaye, Mamadou; Ngo, Henry; Nielsen, Eric L.; Rhodes, Jason; Ruane, Garreth; Holstein, R. van; Wang, Jason; Xuan, Jerry W.

doi:10.1117/12.2313820

Cited by 12 publications

(3 citation statements)

References 59 publications

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“…Hence HD 190360 b becomes a new member of a small sample of nearby Jupiter analogs with well constrained orbits, including eps Indi A b (Feng et al 2019c) and HAT-P-11 c (Xuan & Wyatt 2020). HD 190360 b is about 0.25 away from its host, making it a good candidate for direct imaging by the CGI instrument of the Roman Space Telescope (Bailey et al 2018;Feng et al 2020).…”

Section: Characteristics Of Jupiter Analog and Brown Dwarfsmentioning

confidence: 99%

Optimized modelling of Gaia–Hipparcos astrometry for the detection of the smallest cold Jupiter and confirmation of seven low-mass companions

Feng

Butler

Jones

et al. 2021

Monthly Notices of the Royal Astronomical Society

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To fully constrain the orbits of low mass circumstellar companions, we conduct combined analyses of the radial velocity data as well as the Gaia and Hipparcos astrometric data for eight nearby systems. Our study shows that companion-induced position and proper motion differences between Gaia and Hipparcos are significant enough to constrain orbits of low mass companions to a precision comparable with previous combined analyses of direct imaging and radial velocity data. We find that our method is robust to whether we use Gaia DR2 or Gaia EDR3, as well as whether we use all of the data, or just proper motion differences. In particular, we fully characterize the orbits of HD 190360 b and HD 16160 C for the first time. With a mass of 1.8±0.2 MJup and an effective temperature of 123-176 K and orbiting around a Sun-like star, HD 190360 b is the smallest Jupiter-like planet with well-constrained mass and orbit, belonging to a small sample of fully characterized Jupiter analogs. It is separated from its primary star by 0.25″ and thus may be suitable for direct imaging by the CGI instrument of the Roman Space Telescope.

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Section: Characteristics Of Jupiter Analog and Brown Dwarfsmentioning

confidence: 99%

Optimized modelling of Gaia–Hipparcos astrometry for the detection of the smallest cold Jupiter and confirmation of seven low-mass companions

Feng

Butler

Jones

et al. 2021

Monthly Notices of the Royal Astronomical Society

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“…The open-loop approach consists of periodically touching-up the dark hole 41 by slewing the telescope to a bright reference star and using one of the approaches from Sec. 2.2.…”

Section: Open-loop Maintenancementioning

confidence: 99%

Computational complexities of image plane algorithms for high contrast imaging in space telescopes

Pogorelyuk

Haughwout

Belsten

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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Future planned space telescopes, such as the IR/O/UV Large Telescope, recommended by Astro2020 will be used to directly image exo-Earths. They will employ high-order wavefront sensing and control (HOWFSC) to correct static and slow wavefront errors in the image plane to achieve contrasts better than 10 9 . Our work evaluates the computational requirements for HOWFSC algorithms and compares these to the capabilities of processors that are expected to be available during mission development. We find that HOWFSC creates unprecedented requirements for space-based computational power, such as the ∼10 13 floating-point operations necessary to generate the dark hole, based on the Large UV/Optical/IR (LUVOIR) study. In our worst-case estimates, maintaining an LUVOIR-size dark hole at 10 10 contrast might require up to several orders of magnitude more computational throughput than available on the most advanced radiation-hardened processor.

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“…RDI is a commonly used observational strategy for Hubble Space Telescope imaging observations of debris disks (Golimowski et al 2006;Schneider et al 2009;Schneider et al 2014;Choquet et al 2016) and vortex coronagraph observations with the Hale telescope at Palomar Observatory Serabyn et al 2010;Mawet et al 2011) where ADI is not possible due to its equatorial mount. In addition, RDI will very likely be applied for highcontrast imaging with future space telescopes, including the James Webb Space Telescope (JWST; Green et al 2005) and the Wide Field Infrared Survey Telescope (WFIRST; Spergel et al 2015;Bailey et al 2018) as well as the HabEx (Gaudi et al 2018) and LUVOIR (The LUVOIR Team 2018) mission concepts. The latter two may push to very small angular separations using vortex or other small inner working angle coronagraphs Pueyo et al 2017).…”

Section: The Limitations Of Sdimentioning

confidence: 99%

Reference Star Differential Imaging of Close-in Companions and Circumstellar Disks with the NIRC2 Vortex Coronagraph at the W. M. Keck Observatory

Ruane

Ngo

Mawet

et al. 2019

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Reference star differential imaging (RDI) is a powerful strategy for high contrast imaging. Using example observations taken with the vortex coronagraph mode of Keck/NIRC2 in L band, we demonstrate that RDI provides improved sensitivity to point sources at small angular separations compared to angular differential imaging (ADI). Applying RDI to images of the low-mass stellar companions HIP 79124 C (192 mas separation, ∆L =4.01) and HIP 78233 B (141 mas separation, ∆L =4.78), the latter a first imaging detection, increases the significance of their detections by up to a factor of 5 with respect to ADI. We compare methods for reference frames selection and find that pre-selection of frames improves detection significance of point sources by up to a factor of 3. In addition, we use observations of the circumstellar disks around MWC 758 and 2MASS J16042165-2130284 to show that RDI allows for accurate mapping of scattered light distributions without self-subtraction artifacts.

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Lessons for WFIRST CGI from ground-based high-contrast systems

Cited by 12 publications

References 59 publications

Optimized modelling of Gaia–Hipparcos astrometry for the detection of the smallest cold Jupiter and confirmation of seven low-mass companions

Optimized modelling of Gaia–Hipparcos astrometry for the detection of the smallest cold Jupiter and confirmation of seven low-mass companions

Computational complexities of image plane algorithms for high contrast imaging in space telescopes

Reference Star Differential Imaging of Close-in Companions and Circumstellar Disks with the NIRC2 Vortex Coronagraph at the W. M. Keck Observatory

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