A nearby star system is helping astronomers unravel the mystery of how water appeared in our solar system billions of years ago.
Scientists observed a young star, called V883 Orionis, located 1,300 light-years away using the Atacama Large Millimeter/submillimeter Array of telescopes, or ALMA, in northern Chile.
A team of researchers used ALMA to measure chemical signals in the planet-forming disk, and they detected gaseous water, or water vapor. Their detection allowed the astronomers to trace the water’s journey from the gas clouds that formed the star and will eventually give rise to planets. “We can now trace the origins of water in our Solar System to before the formation of the Sun,” said lead study author John J. Tobin, an astronomer at the National Radio Astronomy Observatory, in a statement.The research team studied a variation called heavy water, detected in V883 Orionis’ disk? where one of the hydrogen atoms is replaced by a heavy isotope called deuterium.
“V883 Orionis is the missing link in this case,” said Tobin in the statement. “The composition of the water in the disc is very similar to that of comets in our own Solar System. This is confirmation of the idea that the water in planetary systems formed billions of years ago, before the Sun, in interstellar space, and has been inherited by both comets and Earth, relatively unchanged.
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