NASA's Roman Telescope to Explore Milky Way's Core in Unprecedented Detail
NASA's upcoming Nancy Grace Roman Space Telescope will conduct an extensive survey of the Milky Way's galactic bulge, aiming to uncover thousands of exoplanets and deepen our understanding of the galaxy's central region.
NASA's Nancy Grace Roman Space Telescope is set to embark on a comprehensive survey of the Milky Way's galactic bulge, the densely populated region surrounding the galaxy's center. This initiative, known as the Galactic Bulge Time-Domain Survey, will observe six specific areas within the bulge, including the very core and five adjacent regions, at 12-minute intervals over a total of 438 days spread across six seasons during the telescope's five-year primary mission.
The survey aims to monitor the motion and luminosity variations of hundreds of millions of stars and their orbiting planets over extended periods. This approach will enable the detection of exoplanets through gravitational microlensing, a technique that identifies planets based on the bending of light from background stars caused by the gravitational field of foreground objects.
Jessie Christiansen of Caltech/IPAC, co-chair of the committee that defined the survey, stated, "This survey will be the highest precision, highest cadence, longest continuous observing baseline survey of our galactic bulge, where the highest density of stars in our galaxy reside."
Roman's observations are expected to reveal over 1,000 new exoplanets, significantly increasing the number identified through microlensing. The telescope's capabilities will allow it to detect planets ranging from those smaller than Mars to gas giants like Jupiter and Saturn, including those in the habitable zone and rogue planets not bound to any star.
Beyond exoplanet discovery, the survey will contribute to various astronomical fields by providing data on transiting planets, red giant stars, stellar-mass black holes, and eclipsing binaries. Dan Huber of the University of Hawaii, another survey co-chair, highlighted the survey's potential, noting, "There is an incredibly rich diversity of science that can be done with a high-precision, high-cadence survey like this one."
The Roman Science Support Center at Caltech/IPAC will handle the high-level science data processing for the survey, including exoplanet microlensing and community outreach. All observations will be publicly available after a short processing period. The mission is scheduled to launch no later than May 2027, with the team on track for a fall 2026 launch.
