Water, which is essential to life on Earth, has been found in a new star according to this paper. The European Space Agency’s Herschel space observatory has discovered water vapor in a gas and dust cloud that is on the verge of collapsing into a new star in the constellation of Taurus known as Lynds 1544 . There’s enough water vapor to fill Earth’s oceans more than 2000 times over. In comparison, all the water on Earth is around 326,000,000,000,000,000,000 gallons.
Water has previously been detected outside of our Solar System as gas and ice on dust grains near sites of active star formation. They were also found in proto-planetary discs.
More than 2000 Earth oceans-worth of water vapour were detected, liberated from icy dust grains by high-energy cosmic rays passing through the cloud.
“To produce that amount of vapour, there must be a lot of water ice in the cloud, more than three million frozen Earth oceans’ worth,” says Paola Caselli, lead author of the paper reporting the results in Astrophysical Journal Letters.
“Before our observations, the understanding was that all the water was frozen onto dust grains because it was too cold to be in the gas phase and so we could not measure it.”
“Now we will need to review our understanding of the chemical processes in this dense region and, in particular, the importance of cosmic rays to maintain some amount of water vapour.”
The observations also revealed that the water molecules are flowing towards the heart of the cloud where a new star will probably form.
“There is absolutely no sign of stars in this dark cloud today, but by looking at the water molecules, we can see evidence of motion inside the region that can be understood as collapse of the whole cloud towards the centre,” says Dr Caselli.
“There is enough material to form a star at least as massive as our Sun, which means it could also be forming a planetary system, possibly one like ours.”
Some of the water vapour detected in L1544 will go into forming the star, the rest will be incorporate into the surrounding disc, providing water for potential new planets.
“Thanks to Herschel, we can now follow the ‘water trail’ from a molecular cloud in the interstellar medium, through the star formation process, to a planet like Earth where water is a crucial ingredient for life,” says ESA’s Herschel project scientist, Göran Pilbratt.