Updated

Updated · Yahoo! Voices · Aug 14

Betelgeuse A Will Explode as a Supernova, Likely Flinging 3-Solar-Mass Companion Away

Updated

Updated · Yahoo! Voices · Aug 14

Betelgeuse A Will Explode as a Supernova, Likely Flinging 3-Solar-Mass Companion Away

Q: If the giant star explodes soon, how exactly will its newly discovered companion survive a point-blank supernova blast?

Betelgeuse B would probably survive because a supernova is violent but not infinitely destructive at every distance, and the companion appears to orbit far enough out to avoid being torn apart. Current estimates put Betelgeuse B at roughly 1.3 billion kilometers from Betelgeuse A, about Saturn’s distance from the Sun. At that range, the blast would hit it with extreme radiation, a flood of neutrinos and a shell of ejecta moving at thousands of kilometers per second. That would badly batter the star’s outer layers, likely heating, stripping and temporarily inflating part of its atmosphere. But a normal star is a self-gravitating object, not a fragile solid body, and models of supernova companions show they can endure heavy mass loss without being destroyed outright. The bigger threat is not “burning up” but whether the explosion removes so much mass from the system that the orbit is disrupted. If Betelgeuse loses more than about half the system’s total mass quickly, the pair could become unbound and Betelgeuse B would fly off as a runaway star. Astronomers already know such survivors exist elsewhere: some fast-moving stars are thought to be former companions of stars that exploded. So survival does not mean escaping unharmed. Betelgeuse B would likely be shock-heated, sandblasted by debris and dynamically kicked into a new trajectory. But unless it is much closer than current estimates suggest, the blast should not physically obliterate it.

Q: As 2027 approaches, could Betelgeuse's hidden companion actually be a mere mirage made of ejected stardust?

Probably not. A dust mirage remains a theoretical possibility, but the balance of evidence now favors a real companion star rather than a clump of ejected material. The strongest point is that astronomers say they directly detected the object’s own light with ESO’s Very Large Telescope and SPHERE instrument in December 2024, when models predicted a companion should be easiest to see. The signal was reported at about 6.1 sigma, far stronger than an earlier tentative Gemini detection near 1.5 sigma. Researchers also estimate a mass of roughly 2.6 to 3.1 Suns, which is hard to reconcile with a transient dust blob. A dust feature is especially plausible around Betelgeuse because the star is known to eject material; its dramatic 2019–2020 dimming was traced to a dust cloud. But dust clouds do not normally behave like a compact source that appears where orbital models predicted and fits Betelgeuse’s long 5.9- to 6-year cycle. The reported object also did not show signs expected from a very young dusty source, such as strong hydrogen emission, and other observations found no ultraviolet or X-ray signature pointing to a different exotic explanation. The key test is still ahead. If in 2027 the object reappears on the opposite side of Betelgeuse, matching the expected orbit, that would largely end the “dust mirage” argument. If it does not, astronomers would have to revisit whether they saw a temporary structure in Betelgeuse’s complex, dusty environment rather than a bound star.

1 articles · Updated · Yahoo! Voices · Aug 14

Betelgeuse A is expected to end in a supernova once iron builds up in its core, triggering collapse and a blast that could release as much energy in moments as the sun emits over its lifetime.
100 billion degrees Celsius temperatures would accompany that collapse, while most signs still point to the explosion occurring roughly 100,000 years from now rather than imminently.
Betelgeuse B — a likely 3-solar-mass companion orbiting at least 1.3 billion kilometers away — would probably survive, though the shock, heat and fast-moving ejecta could strip some of its mass.
About 1% of the supernova's energy would emerge as ordinary radiation, with most carried by neutrinos that should have little effect on the companion despite their enormous numbers.
A 2027 observation could confirm the companion by showing it on the opposite side of Betelgeuse from its 2024 sighting, helping clarify the fate of one of the sky's best-known stars.

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Yahoo! Voices6d ago

Betelgeuse A Supernova: Core Collapse and Companion Star Fate

Does the existence of a massive hidden companion mean Betelgeuse's spectacular supernova finale will happen sooner than expected?

If the giant star explodes soon, how exactly will its newly discovered companion survive a point-blank supernova blast?

As 2027 approaches, could Betelgeuse's hidden companion actually be a mere mirage made of ejected stardust?

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Yahoo! Voices6d ago

Betelgeuse A Supernova: Core Collapse and Companion Star Fate

Betelgeuse A Will Explode as a Supernova, Likely Flinging 3-Solar-Mass Companion Away

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