天文学者らは、天の川銀河で検出された長周期の電波トランジェント（繰り返される謎の信号）の発生源が、希少な連星系であることを特定した。この系は、白色矮星が伴星の赤色矮星から物質を吸収する構造をしている。
シドニー大学の研究者らが率いる国際チームは、オーストラリア連邦科学産業研究機構（CSIRO）のASKAP電波望遠鏡を用いてこの発見に至った。ASKAP J1745−5051と名付けられたこの天体は、両星の公転に伴い、1.4時間周期で電波とX線を放射している。筆頭著者のコヴィ・ローズ氏は、今回の発見により、この発生源が激変星、すなわち降着を起こしている白色矮星であることが裏付けられたと述べている。
Astronomers have identified the source of unusual X-rays from the bright star gamma-Cas as a hidden white dwarf companion siphoning material from it. High-resolution data from the XRISM space mission confirmed that the emissions arise from matter heating up as it falls onto the unseen star. The discovery ends a puzzle that has intrigued scientists since the 1970s.
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Astronomers have identified a hidden white dwarf companion as the source of extreme X-rays from the naked-eye star Gamma Cassiopeiae. Observations from Japan's XRISM space telescope revealed the companion's orbital motion through shifting plasma velocities. The discovery confirms a long-predicted class of binary star systems.
Astronomers have identified massive rings of plasma around young M dwarf stars that function as built-in monitors for stellar space weather. These structures, presented at the American Astronomical Society meeting, could help assess conditions for habitable planets orbiting these common stars. The findings come from research by Carnegie's Luke Bouma and Moira Jardine of the University of St Andrews.
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Astronomers have uncovered evidence that a black hole and neutron star merged while following an unusual oval-shaped orbit, challenging expectations of circular paths in such events. The discovery comes from a reanalysis of gravitational wave data from the event known as GW200105. This finding suggests the system formed in a dynamic stellar environment.