why Tabby jingles randomly in the sky? This is the question that lead to becoming astronomers from that in September of 2015 Tabetha Boyajian , the astrophysics of the Louisiana State University (LSU) discovered this star -also known as KIC 8462852 or Star Boyajian -, he realized that Tabby occasionally low in brightness, sometimes only by 1 percent, and sometimes up to 22 percent, for days or weeks before regaining their brightness. A year later, the astronomer of the LSU Bradley Schaefer discovered that the brightness of the star is also becoming more weak in general with time, decreasing by 14 percent between 1890 and 1989, which did but increase his mystery.
Since then, they have postulated different theories: from storms of comets up to the extravagant argument that it is a "megaestructura" alien that surrounds the star. However, a recent study published in the journal "Monthly Notices of the Royal Astronomical Society" have found a reasoning much more "worldly". As explained by astronomers from the University of Columbia in this study, the explanation would be in the dust that follows a exoluna in decomposition.
"The exoluna is like a comet of ice that evaporates and throw these rocks into space," says Brian Metzger , lead author of the study. "Eventually, the exoluna it will eventually evaporating completely, but it will take millions of years to melt and be consumed by the star.
We are very fortunate to see this event evaporation occurs ". So, the fault is in that celestial body in disintegration, in which material accumulates in a disc of debris s around the star, and that blocks the light as the material passes between it and the vision in the Earth.
The exoluna of a planet swallowed by its star,
So, as an exoplanet destroyed by strong interactions or collisions with its parent star, the exoluna that orbit the exoplanet can become vulnerable to the attraction of the central star of the system, explain the authors. The force may be so large that the star starts a exoluna of your planet, making collision with the star or be ejected from the system.
however, in a small percentage of cases, the star steals the exoluna and placed in a new orbit around . In this new orbit, the exoluna icy and dusty is exposed to the radiation of the star, which tears apart its outer layers, creating clouds of dust that eventually are expelled into the Solar System. When these clouds of dust passing between the star and Earth, we have observed intermittent crashes of brightness, as has happened with Tabby.
do you Continue to the mysteries?This explains the attenuation inconsistent in the short term. However, to explain why Tabby is decreasing its brightness gradually and for decades its light it has been more complicated. The explanation of the team Columbia is that this star has abducted a exoluna of a nearby planet, disappeared a long time ago, and put it in orbit around itself, where has been shattered by a radiation stellar stronger than the one that existed in its former orbit. The pieces of the outer layers dusty ice, gas and rock carbonosa of the exoluna have been able to withstand the ejection pressure of the radiation that creates clouds of dust grain smaller, and the volatile material of large grain has inherited the new orbit of the exoluna around the star of Tabby, where it forms a disk that is locked persistently the light of the star .
The opacity of the disk can change slowly , to the extent that clouds of smaller-grained pass through and larger particles trapped in orbit are moved from the disk to the Star, Tabby, and finally are heated so that they melt and fall on the surface of the star.
ultimately, after millions of years, the exoluna orbiting the star Tabby will evaporate completely. Will have to see if it is the latest theory around the star most mysterious found by humanity.
Date Of Update: 20 September 2019, 20:01
