Birth of a planet in a binary star system: Could such a star system throw a planet into retrograde orbit?
Courtesy NASA/JPL-Caltech A newly detected planet about twice the size of Jupiter circling a distant star seems to be orbiting in the opposite direction the star is spinning. This is a first for astronomers, and goes against conventional wisdom since planets and stars are thought to form out of the same swirling nebulous gas. Scientists aren't sure why it's acting this way, but they speculate the planet could have been sent into retrograde orbit by an external force such as a near-miss with another undetected planet in the system or by a passing star. Kind of interesting whatever the case. The study has been submitted for publication in the Astrophysical Journal, but you can read more about it here right now.
Tags : Each week, CNN posts a collection of space images. This week, you can see the green comet Lulin, thousands of satellites orbiting Earth, and some photos from the Hubble Space Telescope.
Artist rendition of newly formed planet orbiting its young star
Courtesy NASA/JPL-Caltech/R. Hurt (SSC)Astronomers in Germany have announced the discovery of a newborn planet in a distant solar system.
Johny Setiawan, of the Max Planck Institute for Astronomy in Heidelberg, discovered the extrasolar planet using the 2.2m Max-Planck-Gesellschaft telescope in Chile. He said it’s the first and so far earliest example of a planet observed during its formation process.
Planets are thought to form out of the disks of dust and gas swirling around newly created stars. The new planet, catalogued as TW Hydrae b, is situated in the constellation Hydrae some 180 light years from Earth, and is only about 8 or so million years old – a mere baby in terms of planetary formation. In fact, the star it circles isn’t much further along in its own development.
"This demonstrates that planets can form within 10 million years, before the disk has been dissipated by stellar winds and radiation," the researchers explained in a recent issue of the journal Nature.
The gaseous newborn’s mass is about 10 times that of Jupiter in our own solar system, and orbits at a distance of about 4 million miles, just inside the inner edge of its star’s disk of gas and dust.
"The discovery shows that what we always call as 'protoplanetary' disks are indeed protoplanetary; they form planets," Setiawan said. "There are many 'protoplanetary' disks detected around young stars, but no planets so far have been detected within such young systems."
MORE INFORMATION
BBC.com story
Story at SpaceRef.com
The Extrasolar Planets Encyclopaedia
Max Planck Institute for Astronomy
Scientists have announced the discovery of the largest planet yet found, some 1.7 times the size of Jupiter, and circling a star 1,400 light years away.
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