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Обнаружены первые планеты вокруг солнцеподобных звёзд в рассеянных скопленияхAmbient concentration of a Nursery, located in 590 light years from Earth, includes more than 1,000 very dense stars. This, as a relatively small age of the cluster (not more than 600 million years old), did not give astronomers reason to expect the discovery of around sun-like yellow dwarfs such accumulations of exoplanets.
Both stars, Pr0201 and Pr0211 are quite close to massive and bright stars of the center of mass. However, their planetary disks managed for a short time to form massive planet.

And yet it happened: researchers under the leadership of Samuel Quinn of the University of Georgia (USA) found in a Manger two "hot Jupiter", yellow revolving around stars like our Sun.

Opening imposes serious restrictions on the speed of the emergence and evolution of stellar systems of young stars. In the modern view that the planet is large mass (gas giant) was close to the lights, she must migrate there, on the way "Ueshiba" gravitational resonance with their orbits the planet that were closer to the star. It is believed that the most common result of this evolution should be the only giant planet, separated from the stars closer than mercury. If in the cluster, which on the strength of 600 million years, have already taken place and the formation of gas giants, and "cleaning" of their solar system, all these processes can happen very quickly - within a few percent of the total lifetime of stars like the Sun.

But this is not the only specific feature double opening.

In the dispersed cluster Nurseries using the 1.5-meter telescope at the Smithsonian astrophysical Observatory (Amado, AZ, USA) found two exoplanets - Pr0201b and Pr0211b. The first revolves around the dwarf spectral class F, making a complete revolution in 4,4264 ± 0,0070 day, and has a minimum mass in 0,540 ± 0,039 mass of Jupiter, with the estimated mass of the star in 1,234 ± 0,034 and its radius in 1,167 ± 0,121 from the mass and radius of the Sun. The second discovered giant, Pr0211b, revolves around a yellow dwarf spectral class G, and makes a complete revolution in just 2,1451 ± 0,0012 days and weight not less 1,844 ± 0,064 mass of Jupiter, with the estimated mass and radius of the star in 0,952 ± 0,040 and 0,868 ± 0,078 from the sun. Age of both stars is estimated at 578 ± 49 million years that due to the high reliability of the age of the cluster allows you to read a couple of these "hot Jupiter" one of the youngest among the known planets of the Universe.

Note that before in scattered accumulations of the planet was found only around stars of low mass, red dwarfs spectral class Meters Their planet into force usually smaller protoplanetary disk are closer to its star and are less susceptible to the gravitational influences of other bodies in close clusters. Such assumptions were reinforced by the lack of observations of the planets around sun-like stars, now faithfully carried out by the authors.

"It was a great mystery to [astronomers] looking for the planet, " says Samuel Quinn. - We know that most of the stars formed in close environments, such as the Orion nebula, thus, although such a rich [stars] environment and prevents the formation of planets, at least part of sun-like stars in scattered clusters should have the planet. Now we finally found out that it does."

Moreover, the conclusion is as follows: after the discovery of two "hot Jupiter" during detailed observations only 53 of the stars of a congestion of the Manger need to install the probability of opening of the planets of this type (gas giants that are close to its star) 3.8% (+3,0/-2,5%) for all single stars of spectral classes F, G and K (white, yellow, and orange), higher srednegavansky a value of 1.20 ± 0,38%. Such excess scientists explain the relatively high metallicity, typical of stars of a congestion of the Manger. However, they note, the formation of massive planets with a probability higher average could not stop even considered hazardous for protoplanetary disks conditions close stellar neighborhood.

A study published in the Astrophysical Journal Letters; with its Preprint available here.

Based on the materials of the jet propulsion Laboratory of NASA.
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