RESOLVING THE LEDGER
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The Nancy Grace Roman Space Telescope is a NASA observatory designed to settle essential questions in the areas of dark energy, exoplanets, and infrared astrophysics.
NASA
Set to launch on Sunday, Aug. 30, NASA’s Nancy Grace Roman Space Telescope will empower astronomers to explore vast regions of the cosmos and settle essential questions in the areas of dark energy, dark matter, planets outside our solar system, and the formation and growth of galaxies over cosmic time. Key contributions to Roman’s mission made by researchers at NASA’s Ames Research Center in California’s Silicon Valley will advance Roman’s science using the center’s facilities, expertise, and innovations.
Tools to predict, remove glare
Roman’s main camera, the Wide Field Instrument, will capture expansive high-resolution pictures of the universe in optical and near-infrared light. These unprecedented images will enable astronomers to decode some of the deepest mysteries of the cosmos.
Forms of glare that Roman’s camera collects diminish image quality and thereby reduce the ability of astronomers to characterize certain cosmic structures. Innovative software developed by a team at NASA Ames, with collaborators at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, and IPAC/Caltech in Pasadena, California, will improve Roman’s images and optimize observing plans. Called ROSALIA (Roman Sky Analyst for Low Surface Brightness Imaging and Astronomy), the software predicts and removes unwanted light from astronomical images captured by Roman’s Wide Field Instrument.
Contaminating stray light occurs when photons scatter inside the telescope’s optical system. Resulting light glints can produce deceptive image artifacts that mimic the appearance of real planets or nebulae. The ROSALIA software will allow astronomers to adjust their observation plans to limit glints from contaminating science targets in Roman’s images.
In addition to bright glints, stray light can also appear as a diffuse background. This form of stray light interferes with observations of the darkest regions of the universe, which is critical to understanding how large structures in the universe were formed.
Another major contributor to obscuring background light is produced by nature itself: zodiacal light. Zodiacal emission originates from the scattering of sunlight by interplanetary dust particles in our solar system. The ROSALIA software predicts and strips away background contamination, including zodiacal and stray light from images, exposing the faint, diffuse emissions at galaxy edges where cosmic evolutionary histories are hidden.
Simulated, unprocessed
Simulated, processed
Simulated unprocessed image, as it would be captured by the Roman Space Telescope’s Wide Field Instrument, showing two interacting galaxies
NASA
Simulated image, as it would be captured by the Roman Space Telescope’s Wide Field Instrument and then processed using NASA’s Roman Sky Analyst for Low Surface Brightness Imaging and Astronomy tools to remove glare, showing two interacting galaxies.
NASA
Simulated, unprocessed Simulated, processed
Simulated unprocessed image, as it would be captured by the Roman Space Telescope’s Wide Field Instrument, showing two interacting galaxies
NASA
Simulated image, as it would be captured by the Roman Space Telescope’s Wide Field Instrument and then processed using NASA’s Roman Sky Analyst for Low Surface Brightness Imaging and Astronomy tools to remove glare, showing two interacting galaxies.
NASA
Simulated, unprocessed
Simulated, processed
BEFORE AND AFTER PROCESSING
Simulated View From Roman’s Wide Field Instrument
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Image Details
Left: Simulated unprocessed image, as it would be captured by the Roman Space Telescope’s Wide Field Instrument, showing two interacting galaxies. Right: Simulated image of the same view after stepwise processing, using NASA’s Roman Sky Analyst for Low Surface Brightness Imaging and Astronomy (ROSALIA) tools, to remove four types of glare: zodiacal light, thermal background, stray-light, and stellar emission. The result is cleaner, sharper images where galaxies can be detected in greater detail. Image credits: NASA/Borlaff, Sanchez-Alarcon, Nickerson, Marcum and ROSALIA team/STScI/FIRE/DREAM
New ‘multi-star’ tech to see exoplanets
The Roman Coronagraph Instrument is one of two instruments flying on Roman. It will demonstrate the most advanced technologies ever flown in space for directly imaging planets around other stars. The Roman Coronagraph uses a series of masks and mirrors, including two deformable mirrors, to suppress starlight. By precisely controlling the shape of the deformable mirrors, it creates a “dark zone” around the star where observers can see the faint reflected light from orbiting planets.
The baseline operating mode of the Roman Coronagraph Instrument supports observation of exoplanets only in single star systems, as current coronagraph instruments cannot typically suppress the additional contaminating starlight in multi-star systems, such as binary star systems.
Our solar system has a single star, the Sun. But roughly half of Sun-like stars are in multi-star systems. Having the ability to directly image exoplanets in multi-star systems will increase the likelihood of detecting life beyond our solar system and will expand our knowledge about how exoplanets form and evolve, since there are major differences in how those processes unfold in single star versus multi-star systems. Eliminating overlapping glares from multiple stars is the key challenge that must be overcome to image planets in such systems.
Researchers at NASA Ames are meeting that challenge with an innovative technology called Multi-Star Wavefront Control (MSWC). This technology includes custom light-blocking masks and accompanying software designed to suppress the light from multiple stars and reveal hidden exoplanets. Through a collaboration with NASA’s Jet Propulsion Labor...
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