CosmosUp |
Posted: 13 Dec 2014 03:21 AM PST
U.S. astronomers using the Atacama Large Millimeter / submillimeter Array
have captured a remarkable image of a young star, HD 107146, surrounded
by a deep layer of dust — a layer that’s thicker on the outside than it
is on the inside, suggesting the presence of an entire family of
Pluto-like objects.
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HD 107146 is a yellow main sequence star located in the constellation Coma Berenices, about 90 light-years away. It has a magnitude of about 7 and cannot be seen with the naked eye but is visible through a small telescope. The star is 100 million years old and is of particular interest to astronomers because it is in many ways a younger version of our own Sun.
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HD 107146 is a yellow main sequence star located in the constellation Coma Berenices, about 90 light-years away. It has a magnitude of about 7 and cannot be seen with the naked eye but is visible through a small telescope. The star is 100 million years old and is of particular interest to astronomers because it is in many ways a younger version of our own Sun.
“The dust in HD 107146 reveals this very interesting feature — it
gets thicker in the very distant outer reaches of the star’s disk,” said
Luca Ricci, an astronomer at the Harvard-Smithsonian Center for
Astrophysics (CfA), and lead author on a paper accepted for publication
in the Astrophysical Journal. At the time of the observations, Ricci was
with the California Institute of Technology.
“The surprising aspect is that this is the opposite of what we see in
younger primordial disks where the dust is denser near the star. It is
possible that we caught this particular debris disk at a stage in which
Pluto-size planetesimals are forming right now in the outer disk while other Pluto-size bodies have already formed closer to the star,” said Ricci.The new observations are significant because HD 107146 is very similar to Earth’s mother star.
“This system offers us the chance to study an intriguing time around a young, Sun-like star,” ALMA Deputy Director and study co-author Stuartt Corder explained. “We are possibly looking back in time here, back to when the Sun was about 2 percent of its current age.”
The star will continue to be studied by astronomers as it’s shedding light on how systems transition from its early life to the final stage when planets are done forming.
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