A small red star is gradually pulling material off a brown dwarf companion, and astronomers say they have watched it happen. The system, ZTF J0440+2325, sits roughly 300 light-years from Earth. A study in Nature Astronomy, published October 5, 2026, reports it as direct observation of stable mass transfer from a substellar object onto a main-sequence star. “Snacking” is a metaphor: the star is not swallowing its companion whole. It is taking a thin stream of gas over a very long time.
What is the star eating?
The star is an M dwarf, a small, dim red star. Its meal is a brown dwarf, which MIT describes as a planet-like object that is more massive than a planet but not quite large enough to count as a star. The two orbit each other every 87 minutes. The study did not find a planet being consumed.
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MIT News, which covered the work on October 5, 2026, reports estimated masses of about 85 Jupiter masses for the M dwarf and about 25 Jupiter masses for the brown dwarf. Their orbit is tight enough to fit within the diameter of the Sun.
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How can a star eat a brown dwarf slowly?
When a star and a close companion interact, the usual expectation is engulfment and destruction. This system shows a different outcome. Material flows from the lighter brown dwarf onto the M dwarf in a steady, stable way rather than in a runaway collapse. The paper’s abstract says that long-lived stable transfer of this kind was theoretically allowed but had not been observed before.
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MIT’s Kevin Burdge put it this way: “When we think of stars interacting with planets or brown dwarfs, the picture is always that the star eventually swallows the other thing. This is what will happen to the Earth when the sun becomes a red giant. But here, we’ve found an alternative: Instead of swallowing the thing up, the star can gradually eat it, for billions of years.”
How the system was found and checked
- A distinctive light curve. The Zwicky Transient Facility flagged ZTF J0440+2325 because its brightness repeats in a triangular pattern.
- Follow-up measurements. Several telescopes measured the system’s properties, including a small but detectable orbital motion.
- Trajectory modeling. The team modeled the paths of test particles in the system. In the model, they fall onto the M dwarf’s surface. Graduate student Aaron Householder said: “When we track those test particles, we see they indeed fall right onto the surface of the star. This is the first time we’ve caught a low-mass star actively accreting from another low-mass object.”
The paper calls the result a direct observation of stable mass transfer. The trajectory work is a model that supports the physical interpretation. It is not a separate observation.
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Why the brightness looks triangular
The researchers interpret the pattern as a hot spot where the transferred stream strikes the M dwarf. As the binary orbits, the spot rotates into and out of view, which produces the repeating triangular rise and fall. This explanation is the team’s reading of the light curve.
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Will the brown dwarf be swallowed?
Not in the dramatic sense. MIT reports a calculated transfer rate of about one hundred-thousandth of an Earth mass per year. At that pace, the paper and MIT’s coverage say the gradual consumption could potentially continue for billions of years. That duration is a projection from the estimated rate, not something anyone has observed over time.
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A second system: ZTF J1444+4820
The paper also names ZTF J1444+4820, which has a 67-minute period and sits in a hierarchical triple system. The authors present it as a strong candidate for low-mass mass transfer, not a confirmed case. The two systems differ in evidence status as well as configuration:
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| System | Period | Configuration | Status in the paper |
|---|---|---|---|
| ZTF J0440+2325 | 87 minutes | Binary: M dwarf and brown dwarf | Reported direct observation of stable mass transfer |
| ZTF J1444+4820 | 67 minutes | Hierarchical triple | Strong candidate |
What the study does not say
- It does not show that this kind of transfer is common. The work reports one observed system and one candidate, not a population rate.
- The image circulated with MIT’s story is an artist’s impression credited to Aaron Householder, not a telescope photograph.
- The paper is “Stable mass transfer from a substellar object onto an M dwarf” in Nature Astronomy. MIT says the research was supported in part by the National Science Foundation.
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