Stuart Shaklan
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View article: Starshade Exoplanet Data Challenge: What We Learned
Starshade Exoplanet Data Challenge: What We Learned Open
Starshade is one of the technologies that will enable the observation and characterization of small planets around nearby stars through direct imaging. The Starshade Exoplanetary Data Challenge (SEDC) was designed to validate starshade-ima…
View article: Current laboratory performance of starlight suppression systems, and potential pathways to desired Habitable Worlds Observatory exoplanet science capabilities
Current laboratory performance of starlight suppression systems, and potential pathways to desired Habitable Worlds Observatory exoplanet science capabilities Open
We summarize the current best polychromatic (10 to 20 % bandwidth) contrast performance demonstrated in the laboratory by different starlight suppression approaches and systems designed to directly characterize exoplanets around nearby sta…
View article: Starshade Rendezvous: Exoplanet Sensitivity and Observing Strategy
Starshade Rendezvous: Exoplanet Sensitivity and Observing Strategy Open
Launching a starshade to rendezvous with the Roman Space Telescope would provide the first opportunity to directly image the habitable zones of nearby sunlike stars in the coming decade. A report on the science and feasibility of such a mi…
View article: Starshade Imaging Simulation Toolkit for Exoplanet Reconnaissance
Starshade Imaging Simulation Toolkit for Exoplanet Reconnaissance Open
Starshade Imaging Simulation Toolkit for Exoplanet Reconnaissance (SISTER) is a versatile tool designed to provide accurate models of the images of exoplanet systems when observed with a starshade positioned to block the light from the hos…
View article: Exoplanet imaging performance envelopes for starshade-based missions (Erratum)
Exoplanet imaging performance envelopes for starshade-based missions (Erratum) Open
The Journal of Astronomical Telescopes, Instruments, and Systems (JATIS) publishes peer-reviewed papers reporting on original research in the development, testing, and application of telescopes, instrumentation, techniques, and systems for…
View article: Starshade exoplanet data challenge
Starshade exoplanet data challenge Open
Starshade in formation flight with a space telescope is a rapidly maturing technology that would enable imaging and spectral characterization of small planets orbiting nearby stars in the not-too-distant future. While performance models of…
View article: Exoplanet imaging performance envelopes for starshade-based missions
Exoplanet imaging performance envelopes for starshade-based missions Open
We lay out the capabilities and limitations of starshade-based missions aiming to measure the reflected light spectra of temperate planets from an imaging perspective. We use the Starshade Imaging Simulation Toolkit for Exoplanet Reconnais…
View article: Starshade Exoplanet Data Challenge
Starshade Exoplanet Data Challenge Open
Starshade in formation flight with a space telescope is a rapidly maturing technology that would enable imaging and spectral characterization of small planets orbiting nearby stars in the not-too-distant future. While performance models of…
View article: Mapping the observable sky for a Remote Occulter working with ground-based telescopes
Mapping the observable sky for a Remote Occulter working with ground-based telescopes Open
We present the optical requirement-driven observational constraints of the Remote Occulter, an orbiting starshade designed to work with ground-based telescopes to produce visible-band images and spectra of temperate planets around Sun-like…
View article: Starshade rendezvous: exoplanet sensitivity and observing strategy
Starshade rendezvous: exoplanet sensitivity and observing strategy Open
Launching a starshade to rendezvous with the Nancy Grace Roman Space Telescope (Roman) would provide the first opportunity to directly image the habitable zones (HZs) of nearby sunlike stars in the coming decade. A report on the science an…
View article: Antireflection coatings on starshade optical edges for solar glint suppression
Antireflection coatings on starshade optical edges for solar glint suppression Open
Starshades are designed to enable the direct observation of an exoplanet by blocking the light of the planet’s star from reaching the telescope. As discussed in our companion paper [S. Shaklan et al., “Solar glint from uncoated starshade o…
View article: Solar glint from uncoated starshade optical edges
Solar glint from uncoated starshade optical edges Open
The perimeter of a sunflower-like starshade has hundreds of meters of sharp edges that are directly exposed to sunlight. The sunlight diffracts and reflects from the edge resulting in a dual-lobed glint pattern that can be brighter than an…
View article: Overview and reassessment of noise budget of starshade exoplanet imaging
Overview and reassessment of noise budget of starshade exoplanet imaging Open
High-contrast imaging enabled by a starshade in formation flight with a space telescope can provide a near-term pathway to search for and characterize temperate and small planets of nearby stars. NASA’s Starshade Technology Development Act…
View article: Demonstration of deployment repeatability of key subsystems of a furled starshade architecture
Demonstration of deployment repeatability of key subsystems of a furled starshade architecture Open
Starshade concepts must be stowed within rocket fairings for launch and then deployed in space. The in-plane deployment accuracy must be on the order of hundreds of micrometers for sufficient starlight suppression to enable the detection a…
View article: Overview and Reassessment of Noise Budget of Starshade Exoplanet Imaging
Overview and Reassessment of Noise Budget of Starshade Exoplanet Imaging Open
High-contrast imaging enabled by a starshade in formation flight with a space telescope can provide a near-term pathway to search for and characterize temperate and small planets of nearby stars. NASA's Starshade Technology Development Act…
View article: Microelectromechanical deformable mirror development for high-contrast imaging, part 2: the impact of quantization errors on coronagraph image contrast
Microelectromechanical deformable mirror development for high-contrast imaging, part 2: the impact of quantization errors on coronagraph image contrast Open
Stellar coronagraphs rely on deformable mirrors (DMs) to correct wavefront errors and create high-contrast images. Imperfect control of the DM limits the achievable contrast, and therefore, the DM control electronics must provide fine surf…
View article: Status of Space-based Segmented-Aperture Coronagraphs for Characterizing Exo-Earths Around Sun-Like Stars
Status of Space-based Segmented-Aperture Coronagraphs for Characterizing Exo-Earths Around Sun-Like Stars Open
We aim to inform Astro2020 of the status of coronagraph technology for use with a space-based segmented and/or partially obscured primary mirror. Our design and modeling study has determined that multiple coronagraph architectures can achi…
View article: Starshade formation flying I: optical sensing
Starshade formation flying I: optical sensing Open
A key challenge for starshades is formation flying. To successfully image exoplanets, the telescope boresight and starshade must be aligned to ~1 m at separations of tens of thousands of kilometers. This challenge has two parts: first, the…
View article: Simulations of a high-contrast single-mode fiber coronagraphic multiobject spectrograph for future space telescopes
Simulations of a high-contrast single-mode fiber coronagraphic multiobject spectrograph for future space telescopes Open
Directly imaging and characterizing Earth-like exoplanets is a tremendously difficult instrumental challenge. Present coronagraphic systems have yet to achieve the required $10^{-10}$ broadband contrast in a laboratory environment, but pro…
View article: Orbiting Starshade: Observing Exoplanets at visible wavelengths with GMT, TMT, and ELT
Orbiting Starshade: Observing Exoplanets at visible wavelengths with GMT, TMT, and ELT Open
An orbiting starshade working with 30-m class ground-based telescopes would enable observations of molecular oxygen and water on an exo-Earth. The starshade provides the needed contrast and the telescope with advanced adaptive optics provi…
View article: Technology maturity update for the Habitable-zone Exoplanet Imaging Observatory (HabEx) concept
Technology maturity update for the Habitable-zone Exoplanet Imaging Observatory (HabEx) concept Open
Since the 2010 Decadal Survey, the technologies needed for direct imaging of exoplanets advanced significantly. NASA investment in these technologies, prioritized in the 2010 Decadal Survey, have ripened to a maturity to enable direct imag…
View article: Mapping the observable sky for a remote occulter working with ground-based telescopes
Mapping the observable sky for a remote occulter working with ground-based telescopes Open
The Remote Occulter (Orbiting Starshade) is a proposed 100-meter class starshade working with a ground-based telescope, designed for visible-band imaging and spectroscopy of temperate planets around sun-like stars. With advanced adaptive o…
View article: A multi-object spectrograph using single-mode fibers with a coronagraph: progress towards laboratory results on the high-contrast testbed for segmented telescopes
A multi-object spectrograph using single-mode fibers with a coronagraph: progress towards laboratory results on the high-contrast testbed for segmented telescopes Open
Using single-mode fibers (SMFs) in the image plane of coronagraphs allows access to a new wavefront control regime. By using deformable mirrors to create a mismatch between the incoming starlight and the fiber mode, SMFs can serve as integ…
View article: High-Contrast Testbeds for Future Space-Based Direct Imaging Exoplanet Missions
High-Contrast Testbeds for Future Space-Based Direct Imaging Exoplanet Missions Open
Instrumentation techniques in the field of direct imaging of exoplanets have greatly advanced over the last two decades. Two of the four NASA-commissioned large concept studies involve a high-contrast instrument for the imaging and spectra…
View article: ExoEarth yield landscape for future direct imaging space telescopes
ExoEarth yield landscape for future direct imaging space telescopes Open
The expected yield of potentially Earth-like planets is a useful metric for designing future exoplanet-imaging missions. Recent yield studies of direct-imaging missions have focused primarily on yield methods and trade studies using "toy" …
View article: Key Technologies for the Wide Field Infrared Survey Telescope Coronagraph Instrument
Key Technologies for the Wide Field Infrared Survey Telescope Coronagraph Instrument Open
The Wide Field Infrared Survey Telescope (WFIRST) Coronagraph Instrument (CGI) is a high-contrast imager and integral field spectrograph that will enable the study of exoplanets and circumstellar disks at visible wavelengths. Ground-based …
View article: Key Technologies for the Wide Field Infrared Survey Telescope Coronagraph Instrument
Key Technologies for the Wide Field Infrared Survey Telescope Coronagraph Instrument Open
The Wide Field Infrared Survey Telescope (WFIRST) Coronagraph Instrument (CGI) is a high-contrast imager and integral field spectrograph that will enable the study of exoplanets and circumstellar disks at visible wavelengths. Ground-based …