Earliest stars in Universe may have been twins

July 10th, 2009 - 12:31 pm ICT by ANI  

Washington, July 10 (ANI): Astrophysicists, using extremely detailed computer simulations, have determined that the earliest stars in the universe formed not only as individuals, but sometimes also as twins.

The robust simulations of the early universe were created by astrophysicists Matthew Turk and Tom Abel of the Kavli Institute for Particle Astrophysics and Cosmology, and Brian O’Shea of Michigan State University.

“We used to think that these stars formed by themselves, but now we see from our computer simulations that sometimes they have siblings,” said Turk.

“These stars provide the seeds of next generation star formation, so by understanding them we can better understand how other stars and galaxies formed,” he added.

To make this discovery, the researchers created an extremely detailed computer simulation of early star formation.

Into this virtual universe, they sprinkled primordial gas and dark matter as it existed soon after the Big Bang, data they obtained from observations of the cosmic microwave background.

This mostly uniform radiation - a faint glow of radio waves spread across the entire sky - contains subtle variations that reflect the beginning of all structure in the universe.

The simulations focused on the first Population III stars: massive, hot stars thought to have formed a mere several hundred million years after the Big Bang.

As the researchers watched their simulated universe evolve, waves of gas and dark matter swirled through the hot, dense universe.

As the universe cooled, gravity began to draw the matter together into clumps. In areas rich with matter, stars began to form.

In one out of the researchers’ five simulations, a single cloud of dust and dark matter formed into “twin” stars: one with a mass equivalent to about 10 suns, and one with a mass equivalent to about 6.3 suns.

Both of them were still growing at the end of the calculation and will likely grow to many times that mass.

“We ran five of these calculations starting from the beginning of the universe, and to our surprise one of them was special,” said Abel.

“This opens a whole new realm of research possibilities. These stars could evolve into two black holes, which could have created gravitational waves we could detect with an instrument like the Laser Interferometer Gravitational Wave Observatory,” he added.

“This will help us fine-tune our models for how structure in the universe formed and evolved. Understanding the very early stars helps us understand what we see today,” Turk said. (ANI)

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