17 Jun 2019

"HD 106906" the most weired star system ever found!

"HD 106906" the most weired star system ever found!

HD 106906 b

All the stars system follows the same star formation model. But in this very big universe some time astronomer finds some stars, planets or sometime black holes also that are found to be totally different from that we knows about. And these celestial bodies challenges our knowledge and questions our understanding and their existence.

Planet HD 106906 b is among of those mysterious celestial bodies which questions our understanding and their existence.

HD 106906 b is a weird planet which revolves around a binary star system HD 106906.
Observation of HD 106906 was started in 2005, using Magellan Telescope at Campanas Observatory in Atacama desert of Chile.

After 8 years of observation something was found that was affecting the luminosity of the star. After further observations, a planet 11 times massive  than the Jupiter found and was named HD 106906 b.

HD 106906 b was very important  for scientists because of its weird characteristics.

As per star formation model, in a binary star system the mass ratio between two stars should not be more than 10-to-1 but in the case of HD 106906 this mass ratio is 140-to-1 which is not according to star formation model.

Another fact that makes it interesting is that, it also does not  follows planet formation model because of the HD 106906 b. According to planet formation model it is not possible for a planet to form so far from its star as HD 106906 b is.

This planet is present 738 AU (110 billion kms) from its star.

Observers says that they have not found any celestial object after 35 AU from the binary star system. And this information makes another prospective, that planet HD 106906 b really belongs to binary star system HD 106906 or not!

Its not over here, there are more facts that makes HD 106906 star system different and interesting!!

Based on star luminosity and temperature the estimated age of star system HD 106906 is about 13±2 years. But still it has Debris ring is expanded from the distance of 65 AU(10billion KMs) to its inner edge from binary system and up to the 120 to 550 AU( 18 to 82 billion KMs) to its outer edge from binary stars.
And this is really weird to having debris ring present still after 13 million years of star formation.
According to general planetary model, temperature of the planet is respective to its distance from its star. As in our solar system, Mercury and Venus are closest to the Sun so are the hottest planet of the solar system, then comes Earth which have moderate temperature where water exists in liquid state and that’s why  it supports life.

Then comes farther planets like Jupiter, Saturn, Uranus and Neptune which are colder planets and the Neptune and Uranus have lowest temperature among the planets.

So, according to this all detailed observations and planetary theory HD 106906 b should have very low temperature as it is present very far (738 AU)  from its star. But apart from that all, temperature of planet HD 106906 b is 1,800 K(1,500℃) which is really weird but this is explained as, the reason of being so hot is its age which as just 13 million year old and in comparison to the Earth which is 4.5 billion years old.

To being so hot, luminosity of this planet is 0.02% that of the Sun.

For now, researchers are giving different theories about existence of HD 106906 b, and one of which says that this planet is not in the gravitational pull of star HD 106906, and seen along our line of sight just by chance.
But Its not the end, the research on HD 106906 star system will be continued in the future.

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