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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteA “zombie star” is an informal name for a white dwarf that may remain partly intact after a thermonuclear explosion. The idea is linked to Type Iax supernovae, which can eject some of a white dwarf’s material without destroying the whole star. Despite the phrase “explode more than once,” the evidence discussed here does not confirm that a surviving remnant later exploded again.
What astronomers mean by “zombie star”
In this context, a zombie star is not a separate kind of star. It is a possible bound remnant of a white dwarf that experienced a Type Iax supernova. “Bound” means that some of the star’s material remains held together by gravity after the blast.
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Type Iax supernovae are a class of comparatively faint thermonuclear explosions involving white dwarfs. They are generally understood as less complete disruptions than ordinary Type Ia supernovae, but outcomes vary: not every Type Iax event is known to leave a surviving white dwarf. The proposed survivor is what gives the events their “zombie” nickname.
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How a white dwarf could survive a Type Iax explosion
A white dwarf in a binary system can draw material from a companion star. In leading models of Type Iax events, thermonuclear burning ignites but does not expel the entire white dwarf. Some matter is blown away; some may remain in a hot, bound remnant.
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That is different from the usual picture of a Type Ia supernova, in which the white dwarf is completely disrupted. Type Iax explosions are fainter on average than ordinary Type Ia events, although the class includes a broad range of strengths. A 2014 Nature study reported that Type Iax supernovae occur at a rate between 5 and 30 percent of the normal Type Ia rate.
| Feature | Ordinary Type Ia | Type Iax |
|---|---|---|
| White dwarf’s fate | Usually described as completely disrupted | May be only partly disrupted, leaving a bound remnant |
| Typical brightness and strength | Brighter and more energetic on average than Type Iax | Fainter on average, with substantial variation within the class |
| Evidence relevant here | No progenitor is conclusively identified, according to NASA’s account | SN 2012Z has a pre-explosion source and late-time excess light consistent with, but not proof of, a surviving remnant |
The comparison describes broad patterns, not a guaranteed outcome for every event. NASA quoted Rutgers scientist Saurabh Jha noting that understanding Type Iax progenitors matters because no Type Ia progenitor had been conclusively identified in the cited account: NASA’s report.
What the observations of SN 2012Z show
SN 2012Z occurred in NGC 1309, about 110 million light-years away, according to NASA’s 2014 account. Archived Hubble images taken before the explosion showed a luminous blue source at the supernova’s position.
The 2014 study interpreted that source as consistent with an accreting white dwarf and a helium-star companion. The images did not directly show an identified white dwarf; the proposed progenitor system is an interpretation of the source. The study suggested that observations after the supernova faded could test the idea.
A 2022 study examined later Hubble images, including observations roughly 1,400 days after the explosion. The source was still brighter than the pre-explosion detection. That measured excess is compatible with a heated bound remnant, but it does not identify the source of the light on its own.
The study also considered other possible contributors, including supernova ejecta, a shock-heated companion, and interaction with material around the system. The late-time brightness therefore supports the remnant hypothesis without uniquely proving that a white dwarf survived.
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Does a zombie star explode more than once?
Not on the evidence described here. “Explode more than once” is a vivid way to frame the possibility, but observations of SN 2012Z do not document a confirmed second explosion by the same remnant. They support a more limited claim: a Type Iax blast may leave some of the white dwarf gravitationally bound.
NASA reported in 2014 that more than 30 Type Iax events that might leave a surviving white dwarf had been identified. That is the count given at the time, not a current total. NASA also quoted Ryan Foley, lead author of the SN 2008ha paper, emphasizing the class’s range: “SN 2012Z is one of the more powerful Type Iax supernovae and SN 2008ha is one of the weakest of the class, showing that Type Iax systems are very diverse.”
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What to take away from the evidence
- “Zombie star” is a nickname for a possible surviving white-dwarf remnant, not a formal star type.
- Type Iax supernovae may incompletely disrupt a white dwarf, but the outcome can differ from event to event.
- SN 2012Z’s pre-explosion blue source and its later excess brightness are observations; identifying them with a particular companion system and a surviving remnant remains an interpretation.
- The observations make a bound remnant plausible, but they do not establish a later second explosion.
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