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Hubble catches nebula fizzling out faster than thought possible

Hubble catches nebula fizzling...
The Stingray nebula has dimmed dramatically in 20 years – far faster than was thought possible
The Stingray nebula has dimmed dramatically in 20 years – far faster than was thought possible
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The Stingray nebula as it appeared in 1996
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The Stingray nebula as it appeared in 1996
The Stingray nebula has dimmed dramatically in 20 years – far faster than was thought possible
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The Stingray nebula has dimmed dramatically in 20 years – far faster than was thought possible
The Stingray nebula as it appeared in 2016, much smaller and dimmer than it was just 20 years earlier
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The Stingray nebula as it appeared in 2016, much smaller and dimmer than it was just 20 years earlier
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Planetary nebulae are basically slow-motion explosions in space, expected to expand and then fade over tens of thousands of years. But in an unprecedented show, the Hubble Space Telescope has witnessed a nebula fading and shrinking dramatically within just 20 years, suggesting it may disappear entirely in the next few decades.

When stars of a certain size begins to die, they swell up into red giants, throwing off layers of dust and gas. Eventually the star collapses back into a white dwarf, which heats up the material around it until it glows. This phase is expected to last for tens of thousands of years, so from our limited human perspective these celestial fireworks appear frozen in time.

But nebulae are still dynamic objects, and nowhere is that clearer than in the new Hubble observations. The Stingray nebula originally got its name from its gorgeous aqua colors and billowing outline resembling a ray in flight, which is particularly striking in an iconic shot taken in 1996.

The Stingray nebula as it appeared in 1996
The Stingray nebula as it appeared in 1996

However, that’s in stark contrast with images taken in 2016, which reveal a much dimmer, smaller and muted nebula that hardly warrants the Stingray moniker. The blue tones of the inner rings, and the filament structures of the outer areas, have all but vanished.

The glow emitted from the main ingredients of the cloud – hydrogen, nitrogen and oxygen – has faded drastically, with the oxygen emission dimming by a factor of almost 1,000. If anything, the nebula would have been expected to have grown bigger, but that’s clearly not the case.

“This is very, very dramatic, and very weird,” says Martín A. Guerrero, an author of the study. “What we’re witnessing is a nebula’s evolution in real-time. In a span of years, we see variations in the nebula. We have not seen that before with the clarity we get with this view.”

The Stingray nebula as it appeared in 2016, much smaller and dimmer than it was just 20 years earlier
The Stingray nebula as it appeared in 2016, much smaller and dimmer than it was just 20 years earlier

The researchers attribute the nebula’s swift changes to the star at its heart, which is an oddball itself. SAO 245567 is a white dwarf that previous observations have shown is also undergoing rapid transformations, with its temperature shooting up by 68,000 °F (38,000 °C) between 1971 and 2002. Since then it’s been cooling down again, dimming the surrounding nebula.

The astronomers can’t be sure exactly what will happen next, but they suggest that if the current rate of fading continues, the Stingray nebula may all but disappear from the night sky in the next 20 or 30 years.

The research is due to be published in the Astrophysical Journal.

Source: Hubble

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2 comments
ColinChambers
November 24 I expressed my views of atoms to expand memories. I suggested the University combined their talent to focus on neutrinos? Your article concerning the stingray nebula,Is showing rapid transformation within a relatively short period of time, noted to temperature loss and photons emission.
Elements of concern quoted as hydrogen nitrogen and oxygen. It’s of interest concerning the nitrogen oxygen and carbon, Contribute to the formation of neutrinos produced at the centre of all-stars..
Neutrinos contribute control and eventually the collapse of the stingray nebula ,and has influence with regard to all galaxies in the universe.. Jacktar
Gregg Eshelman
Such change isn't unprecedented. Google eta carinae nebula changes to see images of that fairly quickly changing nebula. At the distance it is from Earth it may already be faded away thousands of years ago.