【科学家发现60颗新行星,有一些近似地球】

【科学家发现60颗新行星,有一些近似地球】

在寻找地球以外的生命时,一个国际研究团队最新发现60颗系外行星,它们环绕太阳系邻近的恒星系统,其中包括一颗被称为“超级地球”的Gliese 411b,它具有岩石表层,是第四个最接近太阳的星球。Gliese 411b的发现暗示着所有邻近太阳的恒星都存在行星围绕它们。

http://www.dailymail.co.uk/sciencetech/article-4220518/Scientists-discover-60-planets-near-solar-system.html

Astronomers find SIXTY new planets orbiting stars near our solar system - and say some 'could be like Earth'

  • Along with the 60, researchers found evidence of another 54 planets
  • Most noteable was a hot 'super-Earth' planet called Gliese 411b
  • Researchers say the planet demonstrates that 'virtually all' the nearest stars to the sun have planets orbiting them 

In the hunt for life outside Earth, researchers have discovered 60 new planets orbiting stars near our solar system.

Among the new planets is a hot 'super-Earth', called Gliese 411b, which has a rocky surface and is located in the fourth nearest star system to the sun.

Researchers say that the planet demonstrates that 'virtually all' the nearest stars to the sun have planets orbiting them, and some of these 'could be like Earth.'

Researchers have discovered 60 new planets, including Gliese 411b, which has a rocky surface and is located in the fourth nearest star system to the sun (artist's impression)

Researchers have discovered 60 new planets, including Gliese 411b, which has a rocky surface and is located in the fourth nearest star system to the sun (artist's impression)

GLIESE 411B

Of the new planets discovered, researchers say that one - Gliese 411b - stands out.

Gliese 411b is a hot super-Earth with a rocky surface located in the fourth nearest star system to the sun, making it the third nearest planetary system to the sun.

The significance of its discovery demonstrates that virtually all the nearest stars to the sun have planets orbiting them.

Planets that researchers believe could be like Earth.

The discovery was made by an international team of researchers, led by the University of Hertfordshire.

Along with the 60 new planets, the researchers found additional evidence of a further 54 planets, bringing the total number of potential new worlds to 114.

The results are based on almost 61,000 individual observations of 1,600 stars taken over a 20-year period by US astronomers using the Keck-I telescope in Hawaii.

The observations were part of the Lick-Carnegie Exoplanet Survey, which was started in 1996 by astronomers Steve Vogt and Geoffrey Marcy from the University of California and Paul Butler, from the Carnegie Institute of Science, in Washington.

Dr Mikko Tuomi, who led the study, said: 'It is fascinating to think that when we look at the nearest stars, all of them appear to have planets orbiting them.

'This is something astronomers were not convinced about, even as little as five years ago.

'These new planets also help us better understand the formation processes of planetary systems and provide interesting targets for future efforts to image the planets directly.'

Dr Butler added: 'This paper and data release is one of my crowning achievements as an astronomer.

'It represents a good chunk of my life's work.'

The group's paper has been accepted for publication in The Astrophysical Journal.

The team is hoping their decision will lead to a flurry of new science, as astronomers around the globe combine the HIRES data with their own existing observations, or mount new observing campaigns to follow up on potential signals.

The catalog release is part of a growing trend in exoplanet science to broaden the audience and discovery space, which has emerged in part to handle the aftermath of follow-up discoveries by NASA's Kepler and K2 missions.

A visualisation shows red and blue shifts of starlight caused by a planet's gravitational pull, as astronomers have discovered 60 new planets orbiting stars near the Earth's solar system

A visualisation shows red and blue shifts of starlight caused by a planet's gravitational pull, as astronomers have discovered 60 new planets orbiting stars near the Earth's solar system

'I think this paper sets a precedent for how the community can collaborate on exoplanet detection and follow-up', said team-member Johanna Teske of Carnegie's Observatories and Department of Terrestrial Magnetism.

'With NASA's TESS mission on the horizon, which is expected to detect 1000+ planets orbiting bright, nearby stars, exoplanet scientists will soon have a whole new pool of planets to follow up.'

'The best way to advance the field and further our understanding of what these planets are made out of is to harness the abilities of a variety of precision radial velocity instruments, and deploy them in concert,' said team member Jennifer Burt of MIT.

'But that will require some big teams to break from tradition and start leading serious cooperative efforts.'

 


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