Plate Nº 41 · recorded November 12, 2026
Space & AstronomyReported finding
LISA's Gravity Ripples Could Spot Planets Around Dead Stars
Two NASA-led studies show the future LISA observatory could find planets around pairs of dead stars by reading wobbles in gravitational waves. No such world is confirmed yet.
By James Calloway3 min read616 words
In brief
- Two NASA-led studies published in The Astrophysical Journal outline the method
- LISA, a European-led mission with NASA contributions, is expected to launch in the mid-2030s
- In a test case, Webb could detect a planet about five times Jupiter's mass at roughly 500 light-years
- No planets have yet been confirmed around double white dwarf systems
A space observatory that won't launch until the mid-2030s may one day discover planets orbiting pairs of dead stars — and no such planet has ever been confirmed. That's the finding of two NASA-led studies published in The Astrophysical Journal, and the promise deserves a close look before anyone books telescope time.
What did the researchers actually show?
The studies focus on the Laser Interferometer Space Antenna, or LISA, a planned European-led mission with NASA contributing. Its main job is measuring gravitational waves — tiny ripples in space-time, predicted by Albert Einstein, that are produced when massive objects like stars and black holes orbit one another and travel across the universe.
LISA will be especially tuned to pairs of white dwarfs: the compact, burnt-out remains of stars that have exhausted their fuel. Many of these pairs whip around each other extremely fast, producing a steady gravitational-wave hum.
Here's the trick. A planet circling both dead stars would tug on them with its own gravity, making the pair wobble slightly. That wobble would stamp a small but recognizable pattern onto the gravitational waves reaching LISA.
If that mechanism sounds familiar, it should. Astronomers already find planets by measuring how a star drifts toward and away from Earth as an unseen planet pulls on it. LISA would do the same thing. Instead of tracking changes in starlight, it would track changes in the frequency of gravitational waves.
Could Webb confirm the finds?
The researchers didn't stop at theory. They mapped out which planet masses and orbital periods might be detectable, and they asked whether NASA's James Webb Space Telescope could double-check candidate planets by hunting for extra infrared light.
In one test case, Webb could spot a planet roughly five times Jupiter's mass at a distance of about 500 light-years. Under favorable conditions, LISA might pick up smaller planets purely through their gravitational effects. Note the hedging in that sentence. "Favorable conditions" is doing real work, and the smaller-planet case remains an extrapolation, not a demonstration.
What does this change for planet hunters?
For now, nothing operational. LISA is expected to launch in the mid-2030s, so any discovery along these lines sits at least a decade out. The studies describe a method, not a result. No planet has yet been confirmed around a double white dwarf system, which is precisely why researchers want a new tool for the job.
The method would complement, not replace, existing searches. Telescopes that measure starlight handle many nearby stars well. But systems with two faint stellar remnants present unusual difficulties — the usual signals are simply too dim to read. Gravitational waves could offer a different signal altogether, especially for massive planets in orbits that produce a measurable wobble of both stars.
Why the skepticism is warranted
A simulation-backed study is a long way from a detection. The paper's authors themselves frame these discoveries as a future possibility, and the numbers depend on favorable assumptions about planet masses, orbits, and instrument performance in flight. LISA hasn't been built yet. Webb's confirming infrared observation worked in a test case, at a convenient distance, for a very large planet.
Still, the upside is genuine. If the method works, it could reveal how planets survive — or form — around the remnants of two stars, a question nobody can currently answer with data. It would also prove that an instrument designed to study gravity can open an unexpected window on distant planetary systems.
A mission built for fundamental physics, repurposed as a planet hunter. That's an elegant idea. Whether the universe cooperates, we'll find out sometime after 2035.
via knowridge.com (Source)
More from James Calloway
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Staff writer covering regulation, policy and their impact on general science news at SciBeat.
346 articles
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