Astronomers Discover Extreme Binary White Dwarf System in 8.5-Minute Orbit
Extreme 8.5-minute orbit reveals white dwarf being torn apart by its binary companion

Image: Phys.org
U.S. astronomers, led by Emma Chickles at MIT, have observed a unique binary system of white dwarfs where one star is actively consuming material from the other. This 8.5-minute orbital period system, named ATLAS J1013−4516, offers insights into mass transfer processes and could be a key target for future gravitational wave detection by the LISA mission.
- 01The binary system ATLAS J1013−4516 features two white dwarfs in an orbit of just over 8.5 minutes.
- 02One white dwarf is being torn apart and siphoning material from its companion, forming a superheated accretion disk.
- 03The interior density of the companion star is approximately 250 times that of lead.
- 04Chickles' team utilized a high-speed camera, proto-Lightspeed, to observe real-time changes in brightness during the stars' eclipses.
- 05The findings could enhance future observations by the Laser Interferometer Space Antenna (LISA), set to launch in the 2030s.
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A team of astronomers from the Massachusetts Institute of Technology (MIT), led by Emma Chickles, has made a groundbreaking discovery in the field of astrophysics by observing a binary system of white dwarfs, known as ATLAS J1013−4516. This system features an extreme orbital period of just 8.5 minutes, where one white dwarf is actively consuming material from its companion. The research highlights the dynamic processes occurring in ultracompact binary systems, which remain largely unexplored. Chickles and her team combed through millions of stellar images to identify this unique system, using a high-speed camera to observe real-time brightness changes during the stars' eclipses. The companion white dwarf has an interior density of about 250 times that of lead, contributing to the formation of a superheated accretion disk comparable in size to Saturn. This discovery not only sheds light on the mass transfer processes in such systems but also positions ATLAS J1013−4516 as a potential target for the upcoming Laser Interferometer Space Antenna (LISA), which aims to detect gravitational waves from various celestial objects, including white dwarfs, when it launches in the 2030s.
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