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Jupiter-like planet orbits very young star

A team of astronomers has discovered a planet that is at least eight times larger than Jupiter, CI Tau b, orbiting 2 million-year-old about 450 light years from Earth star in constellation Taurus.

Astronomers from Rice, Lowell Observatory, the University of Texas at Austin, NASA and Northern Arizona University announced the discovery of a giant planet in close orbit around a star so young that it still retains a disk of circumstellar gas and dust. (Reuters)

A team of astronomers has discovered a planet that is at least eight times larger than Jupiter, CI Tau b, orbiting 2 million-year-old about 450 light years from Earth star in constellation Taurus.

In contradiction to the long-standing idea that larger planets take longer to form, astronomers from Rice, Lowell Observatory, the University of Texas at Austin, NASA and Northern Arizona University announced the discovery of a giant planet in close orbit around a star so young that it still retains a disk of circumstellar gas and dust.

“For decades, conventional wisdom held that large Jupiter-mass planets take a minimum of 10 million years to form,” said lead author Christopher Johns-Krull, adding “That’s been called into question over the past decade and many new ideas have been offered, but the bottom line is that we need to identify a number of newly formed planets around young stars if we hope to fully understand planet formation.” CI Tau b orbits the star CI Tau once every nine days.

The planet was found with the radial velocity method, a planet-hunting technique that relies upon slight variations in the velocity of a star to determine the gravitational pull exerted by nearby planets that are too faint to observe directly with a telescope. The discovery resulted from a survey begun in 2004 of 140 candidate stars in the star-forming region Taurus-Auriga.

“This result is unique because it demonstrates that a giant planet can form so rapidly that the remnant gas and dust from which the young star formed, surrounding the system in a Frisbee-like disk, is still present,” said co-leader Lisa Prato. “Giant planet formation in the inner part of this disk, where CI Tau b is located, will have a profound impact on the region where smaller terrestrial planets are also potentially forming.” The study will be published in the Astrophysical Journal.

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