Astrophysics

The Life and Death of Stars That Capture Primordial Black Holes

Ore Gottlieb, Matteo Cantiello, Cameron Norton, Ken Van Tilburg, Matthew Kleban

Featured June 14, 2026

AI-generated analysis — This is SciGrove's AI interpretation of the paper, not peer-reviewed content. Always refer to the original paper.

Simply

When a star captures a tiny, dense primordial black hole, it can either be eaten from the inside out quietly or explode violently if the black hole forms a spinning accretion disk.

In depth

The paper establishes a global framework for the evolution of Hawking stars, which are main-sequence stars that have captured a primordial black hole (PBH). The study demonstrates that the system's fate bifurcates based on whether the PBH can form a rotationally supported accretion disk before consuming the host star. If a disk forms, the resulting magnetic feedback and relativistic jets trigger an explosive disruption of the star, whereas otherwise, the PBH consumes the star quietly.

Key Takeaways

1
Three-body interactions with planetary companions are the primary mechanism for capturing PBHs into bound orbits within stars.
2
The transition to an explosive fate is governed by the disk-formation threshold, which depends on the host star's rotation history and the PBH mass.
3
Explosive Hawking stars produce distinct multi-component transients, including a shock breakout flash and a subsequent UV/blue cooling signal.

Conceptual Flow

HIGH LEVEL

Methodology: The Evolutionary Path

The researchers tracked how a captured black hole grows inside a star and determines if it triggers an explosion.

Captured Black Hole

Stellar Core

Accretion and Growth

Quiet Death

Explosive Disruption

Results: The Impact

The study shows that these stars can create bright flashes of light that telescopes might see.

Explosive Disruption

Produces Transients

Light Flash

Radio Glow

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