Washington: A new method for analysing the chemical composition of stars may help scientists winnow the search for Earth-like planets where life like ours can form, a new study has found, says PTI.
Researchers from Yale University in the US have found a computational modelling technique that gives a clearer sense of the chemistry of stars, showing the conditions present when their planets formed. The system creates a new way to assess the habitability and biological evolution possibilities of planets outside our solar system, researchers said.
“This is a very useful, easy diagnostic to tell whether that pale blue dot you see is more similar to Venus or the Earth,” said Debra Fischer, a Yale professor of astronomy. “Our field is very focused on finding Earth 2.0, and anything we can do to narrow the search is helpful,” said Fischer.
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Lead author John Michael Brewer, a postdoctoral researcher at Yale, has used the technique previously to determine temperature, surface gravity, rotational speed, and chemical composition information for 1,600 stars, based on 15 elements found within those stars. The new study looked at roughly 800 stars, focusing on their ratio of carbon to oxygen, and magnesium to silicon.
Brewer explained that understanding the makeup of stars helps researchers understand the planets in orbit around them. “We’re getting a look at the primordial materials that made these planets. Knowing what materials they started with leads to so much else,” he said.
For instance, the study shows that in many cases, carbon is not the driving force in planetary composition. Brewer found that if a star has a carbon/oxygen ratio similar to or lower than that of our own Sun, its planets have mineralogy dominated by the magnesium/silicon ratio.
About 60 per cent of the stars in the study have magnesium/silicon ratios that would produce Earth-like compositions; 40 per cent of the stars have silicate-heavy interiors