XRISM Mission Observes Pulsar Capturing Stellar Wind From Companion Star

Astronomers using data from the Japan-led XRISM (X-ray Imaging and Spectroscopy Mission) observatory have directly observed a giant star's stellar wind being captured by its compact companion, according to NASA Breaking News. The process, researchers said, provides the power source for strong X-ray flares observed in the system.

NASA described the finding as part of a broader research effort into what it called the "extreme universe," aimed at improving understanding of how highly compact and energetic objects, such as neutron stars, interact with material around them.

XRISM is a mission led by Japan's space agency JAXA in collaboration with NASA. The observatory is designed to study X-ray emissions from some of the most energetic phenomena in space, including systems where a compact object, such as a pulsar, draws in gas or wind from a companion star.

According to NASA's description of the observations, the giant star in the system produces a strong outflow, or stellar wind, a fraction of which is gravitationally captured by its dense companion. NASA said this captured material is believed to be the source of powerful X-ray flaring seen in the system.

NASA did not provide further technical details, mission timeline, or specific system identification beyond the general description in its release. The agency framed the observation as a step toward better understanding the physical processes governing binary star systems containing compact objects.

Further scientific analysis and publication details regarding the observations were not specified in the source material.