A Star Feeds on a Brown Dwarf in a Rare Cosmic Process

Topic: Astronomy

Astronomers at MIT have discovered a star system where a small star is slowly consuming a nearby brown dwarf. This process could last billions of years and is different from the usual way stars interact with planets or other objects.

A team of astronomers led by Kevin Burdge from MIT has made an exciting discovery about a star system located in our Milky Way galaxy, approximately 300 light-years away. The system, called ZTF J0440+2325, consists of a small star and a brown dwarf, which is an object more massive than a planet but not massive enough to sustain the hydrogen fusion that powers ordinary stars.

The astronomers used data from the Zwicky Transient Facility (ZTF) to study the brightness changes in this system. They noticed a peculiar pattern in the light curve, which is a graph showing how bright or dim an object appears over time. Instead of a smooth rise and fall, the brightness repeatedly traced a triangular shape.

This discovery is significant because it shows that stars can interact with other objects in different ways than previously thought. While most planets orbit their stars in stable paths, some stars can swallow their planetary companions in one dramatic event. But in this case, the star is slowly feeding on its companion over billions of years.

The research team includes scientists from MIT and several international institutions, including Caltech, the University of Hawaii, and the Instituto de Astrofísica de Canarias. Their findings were published in Nature Astronomy on October 5, 2026.

Why It Matters

This discovery helps us understand how stars interact with other objects in our galaxy, which can have implications for our understanding of planetary formation and the life cycle of stars.

Key Facts

• A team of astronomers from MIT discovered a star system where a small star is slowly consuming a nearby brown dwarf.
• The system, called ZTF J0440+2325, is located in our Milky Way galaxy, approximately 300 light-years away.
• The star and the brown dwarf are interacting in a rare cosmic process that could last billions of years.
• This discovery challenges our previous understanding of how stars interact with planets or other objects.
• The research team includes scientists from MIT and several international institutions.

Key Terms

Brown Dwarf

An object more massive than a planet but not massive enough to sustain the hydrogen fusion that powers ordinary stars.

Hydrogen Fusion

The process by which stars generate energy from hydrogen atoms.

Implications

This discovery helps us understand how stars interact with other objects in our galaxy, which can have implications for our understanding of planetary formation and the life cycle of stars.