Astronomers spot white dwarf star with two rings of planetary debris

Key Points:

• Researchers have discovered a white dwarf named J1328−1450, located about 1,600 light-years away, surrounded by two distinct rings of planetary debris, a unique configuration not seen before in similar systems.
• The debris discs may have been shaped by two surviving rocky bodies, possibly remnants of larger disrupted planets, suggesting that some planetary material can endure a star's transformation into a white dwarf.
• The white dwarf has about 47% of the sun's mass compressed into a size comparable to Earth, and the difference in composition between the two rings indicates they may originate from different parent bodies or layers of a disrupted rocky object.
• This discovery provides insight into the potential future of our solar system, where the sun will become a red giant and later a white dwarf, possibly engulfing inner planets while outer planets and some rocky bodies survive and form debris discs.
• The findings imply that after the sun's death, surviving planetary remnants could be pulled close enough to be disrupted by gravity, creating debris rings similar to those observed around J1328−1450, offering a glimpse into the long-term evolution of planetary systems.