Architecture for space-based exoplanet spectroscopy in the mid-infrared

Green, Joseph J.; Bradford, Samuel C.; Gautier, T. N.; Rodgers, Michael; Sidick, Erkin; Vasisht, Gautam

doi:10.1117/12.2314338

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…18 allows for actuation at temperatures as low as 4 K which would fit well with the spinning Mid-IR exoplanet imaging project proposed in Ref. 19.…”

Section: Specifics On Why New Technologies Should Be Consideredmentioning

confidence: 61%

Advances in the control of Si substrates with magnetic smart materials to provide low-power surface control on the sub-nanometer level for space deformable mirrors

Quispe,

Ulmer,

Buchholz

et al. 2023

Techniques and Instrumentation for Detection of Exoplanets XI

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Accurate high-contrast imaging is achieved using deformable mirrors (DM) with actuator precision of 10s picometers. Beyond the demanding wavefront control requirements needed to achieve a contrast ratio of 10 −10 , there is an additional science driver for achieving this ratio over an outer working angle (OWA) large enough to image an exoplanet in a 1 AU orbit around a star 10 parsec or 0.1 ′′ maximum separation from its host star. Using the formula OWA = Naλ/2D dictates that as D increases, the primary mirror diameter, so does the total number of actuator elements (Na 2 ). Then, the demands of cabling, power, and mass also increase as Na 2 , which is difficult to achieve for DM-based space missions. Furthermore, fixed-position actuators require high reliability. Our technology has the potential of being able to reduce the number of wires from Na 2 to 2Na and with a motion stage can mitigate the dead pixel issue. We report here our work to mature our technology which is based on magnetostriction and magnetization of a magnetic hard overcoat to enable maintaining in-plane stress and set-and-forget DM surface changes when actuators are powered off.

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“…18 allows for actuation at temperatures as low as 4 K which would fit well with the spinning Mid-IR exoplanet imaging project proposed in Ref. 19.…”

Section: Specifics On Why New Technologies Should Be Consideredmentioning

confidence: 61%

Advances in the control of Si substrates with magnetic smart materials to provide low-power surface control on the sub-nanometer level for space deformable mirrors

Quispe,

Ulmer,

Buchholz

et al. 2023

Techniques and Instrumentation for Detection of Exoplanets XI

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show abstract

“…These problems should be addressed for each individual application and are beyond the scope of this work. Others have recently addressed some of these issues, e.g., Monreal et al (2018) have proposed a specific design implementing a telescope with a long and narrow pupil, while Green et al (2018) propose using a long and narrow aperture to facilitate the long baselines required for detection of exo-planets in the mid-infra red.…”

Section: Introductionmentioning

confidence: 99%

A Possible Advantage of Telescopes with a Noncircular Pupil

Nir

Zackay

Ofek

2019

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Most telescope designs have a circular-shape aperture. We demonstrate that telescopes with an elongated pupil have better contrast, at lower separations, between a bright central star and a faint companion. We simulate images for an elongated-pupil telescope and for a circular-pupil telescope of equal aperture area and integration time, investigating specifically what is the maximal contrast for finding faint companions around bright stars as a function of angular separation. We show that this design gives better contrast at lower separation from a bright star. This is shown for diffractionlimited (for perfect and imperfect optics) and seeing-limited speckle images, assuming equal aperture area and observing time. We also show the results are robust to errors in measurement of the point spread function. To compensate for the wider point spread function of the short axis, images should be taken at different rotation angles, either by rotating the telescope around the optical axis or by allowing a stationary mirror array to scan different parallactic angles with time. Images taken at different rotation angles are added using the proper image coaddition algorithms developed by Zackay & Ofek. The final image has the same contrast in all angles, rather than in specific areas of diffraction nulls. We obtained speckle observations with a small, ground based elongated-aperture telescope and show the results are consistent with simulations.

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Architecture for space-based exoplanet spectroscopy in the mid-infrared

Cited by 2 publications

References 10 publications

Advances in the control of Si substrates with magnetic smart materials to provide low-power surface control on the sub-nanometer level for space deformable mirrors

Advances in the control of Si substrates with magnetic smart materials to provide low-power surface control on the sub-nanometer level for space deformable mirrors

A Possible Advantage of Telescopes with a Noncircular Pupil

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