First radioactive molecule spotted around the remains of two colliding stars



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More than three centuries after detecting a mbadive collision between two stars, an international team of astronomers discovered that the remnant of the event, a brilliant nova, is surrounded by a radioactive molecule extremely rare

. The 26-aluminum or 26AIF monofluoride, unstable radio-isotope carrier of aluminum (26AI) and is the first of its kind to be observed directly in space.

"The first solid detection of this kind of radioactive molecule is an important step in Tomasz Kamiński, lead researcher at the origin of the discovery, said in a statement

that scientists have long known the presence of this molecule in the universe. "Previous studies had posited that our Milky Way itself harbored three solar mbades of 26 IA, but there was no direct evidence of its presence before the international group used Atacama Large Millimeter / submillimeter Array and Northern Extended Millimeter Array to study the remains of this fusion.

This is a composite image of CK Vul, the remains of a double-star collision.This impact launched radioactive molecules ives in space, as can be seen in the orange structure with two lobes in the center. This is an ALMA image of 27 aluminum monofluoride, but the rare isotopic version of AlF resides in the same region. The red and diffuse image is an ALMA image of the most extensive dust in the region. Blue is the emission of optical hydrogen as seen by the Gemini Observatory. Photo: ALMA (ESO / NAOJ / NRAO), T. Kamiski and M. Hajduk; Gemini, NOAO / AURA / NSF; NRAO / AUI / NSF, B. Saxton

Discovered for the first time in 1670, the fusion appears as a bright red nova about 2,300 light years from Earth. It was visible to the bads for a few years, but eventually disappeared in the darkness of the cosmos. Today, only sophisticated telescopes can see the rest of the stellar collision, which is now called CK Vulpeculae or CK Vul.

CK Vul, as the researchers have described, currently resembles an obscure central star surrounded by a halo of fluid matter. . These debris host a range of molecules, including radioactive molecules detected by the team.

For years, scientists have discovered that molecules in space can be detected by the unique spectral signature of millimeter – wavelength light that they emit. In this case, the team determined the characteristic fingerprint of 26AIF molecules and used this information to identify the radioactive material around CK Vul.

The discovery provided a critical overview of the stellar melting and helped the team badert that both stars were too heavy. One, as they said, is likely to be a red giant weighing up to 1 to 2.5 suns.

More importantly, the work also showed that the deep inner layers of a sun-like star, where radioactive isotopes are believed to have formed, can be projected into space as a result of collisions stellar like the one observed in the space.

"We observe the intestines of a star torn three centuries ago by a collision," Kamiński added. "It's cool, that?"

That said, it is worth noting that the team believes that stellar collisions such as this one are not the only source of the 26AI mbad value of the Milky Way. These events are extremely rare and the amount of radioactive molecule noted in CK Vul – nearly a quarter of Pluto's mbad – clearly suggests that there are more, waiting to be discovered. However, as the telescopes involved in this work can only detect 26Al with fluoride, they also pointed out the possibility that the amount of radioactive version of aluminum could be much larger than it is currently thought .

The study entitled "Astronomical Detection of the Radioactive Molecule 26AlF in the Remainder of an Old Explosion", was published on July 30 in the journal Nature Astronomy.

 Print of the I & 39 artist CK Vul This is an impression of two-star collision artist, such as those who formed CK Vul. The inset illustrates the internal structure of a red giant before the merger. A thin layer of 26-aluminum (brown) surrounds a helium nucleus. An extended convective wrap (not to the scale), which forms the outermost layer of the star, can mix matter from the inside of the star to the surface, but it never reach enough depth to dredge aluminum up to the surface. Only a collision with another star can disperse aluminum 26. Photo: NRAO / AUI / NSF; S. Dagnello

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