Saturday 01 February 2025
The search for black holes lurking among our stars has taken a significant step forward, as scientists have set an upper limit on their presence in the universe.
A team of researchers has combed through data from NASA’s Transiting Exoplanet Survey Satellite (TESS) to identify potential black hole companions to Sun-like stars. By examining the light curves of over 4.7 million stars, they’ve established that any black holes with orbital periods shorter than three days can’t make up more than about 9.5% of all solar-type stars.
This limit is significant because it provides a benchmark for testing theoretical models of how black holes form and evolve in the universe. It also highlights the challenges of detecting these elusive objects, which are notoriously difficult to spot due to their small size and lack of distinct features.
The researchers used two methods to identify potential black hole companions: one based on the ellipsoidal shape of the star’s light curve when it’s distorted by a nearby companion, and another that relies on the subtle changes in brightness caused by the gravitational pull of a smaller companion. While these methods aren’t foolproof, they’ve proven effective at identifying promising candidates for further study.
However, even with these techniques, black holes are notoriously difficult to confirm as companions to stars. False positives can arise from other astrophysical phenomena, such as contact binary systems or stars that are close to filling their Roche lobes. To combat this issue, the researchers employed sophisticated statistical analysis and machine learning algorithms to weed out false positives.
The results of this study have significant implications for our understanding of black hole formation and evolution in the universe. They suggest that any theoretical models predicting a higher frequency of short-period black holes may need to be reevaluated.
While we’re still far from directly observing these enigmatic objects, the search continues. Future surveys with even deeper limiting magnitudes, such as the Zwicky Transient Facility, could potentially uncover more black hole companions and shed light on their mysterious nature.
Cite this article: “New Limit Set on Black Hole Presence in Stars”, The Science Archive, 2025.
Black Holes, Stars, Nasa, Tess, Exoplanets, Satellites, Astronomy, Space, Science, Research
