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Home / Science / Data offer new clues about why stars explode – ScienceDaily

Data offer new clues about why stars explode – ScienceDaily



When NASA's Transiting Exoplanet Survey Satellite launched into space in April 2018,

But recently published research, a team of astronomers at Ohio State University

"We have known." "We have known They're exploding, "said Patrick Vallely, lead author of the study at Ohio State Astronomy Graduate Student. Directly from a standard star companion and explode into it – the child of standard idea that had led to people This is because the TESS light curve does not show any evidence of the explosion slamming into the surface of a companion, and because the hydrogen signatures in the SALT spectra do not evolve like the other elements, we can rule out the standard model. "

Monthly Notices of the Royal Astronomical Society represents the first published finding about a supernova observed using TESS, and add new

Those elements have long troubled astronomers.

A white dwarf explodes into a specific type of supernova, a la, after gat astronomers believe. But if that is true, then the explosion should, astronomers have theorized, leave behind trace elements of hydrogen, a crucial building block of stars and the entire universe.

But until this TESS-based observation of a supernova, astronomers had never seen those hydrogen traces in the explosion's aftermath: This supernova is the first of its type in which astronomers have measured hydrogen. That hydrogen, first reported by an Observatory of the Carnegie Institution for Science, could change the nature of what astronomers know about white dwarf supernovae.

"The most interesting thing about this particular supernova is the hydrogen we saw in its spectra (the elements of the explosion leaves behind), "Vallely said. Supernova in the first place. "

The hydrogen could mean that the white dwarf consumed a nearby star. In that scenario, the second star would be a normal star in the middle of his life span ̵

1; not a second white dwarf. But when astronomers measured the light curve from this supernova, the curve indicated that the second star was in fact a second white dwarf.

Professor of Astronomy Kris Stanek, Vallely's adviser at Ohio State and a co-author of this paper, said it is possible that the hydrogen came from a companion star – a standard, regular star

"We would think that because we see this hydrogen, it is more likely that it will come to a halt." means that the white dwarf consumed a second star and exploded, but based on the supernova, that might not be true, "Stanek said.

" Based on the light curve, the most likely thing that happened "We think that's the hydrogen coming out of a third star in the system," Stanek added. Ohio State right now, that is the way to make a Type Ia (pronounced 1-A) supernova is by having two white dwarf stars interacting – colliding even, but also having a third star that provides the hydrogen. "

For the Ohio State Research, Vallely, Stanek and a team of astronomers from around the world combined TESS data, a 10-centimeter-diameter telescope, with data from the All-Sky Automated Survey for Supernovae (ASAS-SN for short.) ASAS-SN is by Ohio State and is made up of small telescopes around the world watching the sky for supernovae in far-away galaxies.

TESS, by comparison, is designed to search the skies for planets in our nearby galaxy – and to provide much more information than previous satellite telescopes.

The team combined data from TESS and ASAS-SN with data from the South African Large Telescope to the left in the supernova's wake.

"What is really cool about these results is when we combine the data, we can learn new things," Stanek said , "And this supernova is the first exciting case of that synergy."

The Supernova this team observed what a Type Ia, a type of supernova that can occur when two stars orbit one another – what astronomers call a binary system Some cases of a Type I supernova.

A white dwarf has burned off all its nuclear fuel, leaving behind only a very hot core. (White dwarf temperatures exceed 100,000 degrees Kelvin – nearly 200,000 degrees Fahrenheit.) Unless the star grows bigger by stealing bits of energy and matter from a nearby star, the white dwarf spends the next billion years of cooling down before turning into a lump of black carbon.

Type I supernovae are important for.

Type I supernovae are important for space science – they help astronomers measure distance in space, and help them learn how to quickly grow the universe (a discovery so important that it won the Nobel Prize in Physics in 2011.)

"These are the most famous types of supernova – they were discovered in the 1990s, "Vallely said. And that's what I really like about combining TESS and ASAS-SN here, that we can build up this

Scientists broadly agree that the companion star leads to a white dwarf supernova, but the mechanism of that explosion, and the makeup of the companion star, are less clear

This finding, Stanek said, provides some evidence that the companion star in this type of supernova is likely to become white.

"We are seeing something new in this data, and it helps to understand the Ia supernova phenomenon, "he said.

ASAS-SN is supported by Las Cumbres Observatory. "

ASAS-SN is supported by Las Cumbres Observatory The Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics at Ohio State, the Chinese Academy of Sciences South American Center for Astronomy and the Villum Fonden in Denmark.


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