Reply to thread

Message: <blockquote data-quote="Core" data-source="post: 7192297" data-attributes="member: 263471">Nearby Star System Could Support Earth-Like PlanetTurbulent binary star  systems, such as our closest stellar neighbor, Alpha Centauri, could host Earth-sized planets, new computer  modeling indicates.  Scientists have so far  been unsure whether planets could form amid the chaotic gravitational tug-of-war between two binary stars.  Some recent studies have suggested they could, but these projects have  focused on modeling the final stage of planet formation. Now researchers have  probed whether or not the necessary precursor to planet formation — a so-called "protoplanetary" disk of planet building blocks — could survive in this environment.  The answer appears to  be yes, at least under certain conditions, such as a specific range of gas densities and star  orientations. And in the specific case of Alpha Centauri B (CenB), one of two binary  stars in the system <a href="http://www.space.com/businesstechnology/080313-tw-centauri-travel.html" target="_blank">Alpha Centauri</a>, these conditions are right. The system is about 4.2  light-years away."It is quite possible  that a habitable <a href="http://www.space.com/scienceastronomy/080307-another-earth.html" target="_blank">Earth-like planet</a> may be hidden around CenB," the researchers — Jilin Zhou and Jiwei Xie of China's Nanjing University and Jian Ge of the University of Florida in Gainesville — wrote in a paper recently submitted to the Astrophysical Journal.  The scientists built a  computer model to test the birth of baby solar systems around binary stars. They were able to alter starting conditions such as the arrangement of the parent stars, and the amount  of gas in the system. They then ran their simulations over a multitude of  conditions to discover which factors would lead to a disk of planetary embryos  forming between 0.5 to 2.5 times the distance between the Earth and the sun —  roughly the zone in which a terrestrial planet might be habitable.  The researchers also  tested the case of Alpha Centauri B.  This star is just a  bit smaller than our own sun, at about 0.93 times the sun's mass. Its partner, Alpha Centauri A, weighs about  1.1 times the sun's mass. They are the closest stars to the sun after their  smaller companion Proxima Centauri.  Although no <a href="http://www.space.com/scienceastronomy/extrasolar_planets.html" target="_blank">extrasolar planets</a> have yet been discovered around any of these stars, Alpha  Centauri B in particular is thought to be a prime candidate for hosting an  Earth-like planet in or near its habitable zone.  The results are  "encouraging" for the case of Alpha Centauri B, the scientists said.  "Although planetesimal  accretion in CenB is significantly less efficient and slowed-down as compared to single star systems, it is still possible," they wrote.</blockquote>

Verification: Hata thunen beduwama keeyada? (60 bedeema thuna)

Top Bottom