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Hunting Rogue Planets and Runaway Stars

Sunday, March 19, 2017 1:09

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In the search for rogue planets and failed stars astronomers using the NASA/ESA Hubble Space Telescope have created a new mosaic image of the Orion Nebula. During their survey of the famous star formation region, they found what may be the missing piece of a cosmic puzzle; the third, long-lost member of a star system that had broken apart.

The Orion Nebula is the closest star formation region to Earth, only 1400 light-years away. It is a turbulent place — stars are being born, planetary systems are forming and the radiation unleashed by young massive stars is carving cavities in the nebula and disrupting the growth of smaller, nearby stars.

This composite image of the Kleinmann-Low Nebula, part of the Orion Nebula complex, is composed of several pointings of the NASA/ESA Hubble Space Telescope in optical and near-infrared light. Infrared light allows to peer through the dust of the nebula and to see the stars therein. The revealed stars are shown with a bright red colour in the image.

With this image, showing the central region of the Orion Nebula, scientists were looking for rogue planets and brown dwarfs. As side-effect they found a fast-moving runaway star.

Credit:NASA, ESA/Hubble

Because of this ongoing turmoil, Hubble has observed the nebula many times to study the various intriguing processes going on there. This large composite image of the nebula’s central region, combining visual and near-infrared data, is the latest addition to this collection.

Astronomers used these new infrared data to hunt for rogue planets — free-floating in space without a parent star — and brown dwarfs in the Orion Nebula. The infrared capabilities of Hubble also allow it to peer through the swirling clouds of dust and gas and make the stars hidden within clearly visible; the unveiled stars appear with bright red colours in the final image. Among these, astronomers stumbled across a star moving at an unusually high speed — about 200 000 kilometres per hour. This star could be the missing piece of the puzzle of a star system that had been broken apart 540 years ago.

This video starts with a ground-based image of the night sky, taken by Akira Fujii, zooms on the star formation region of the Orion Nebula — observed by Martin Kornmesser — and ends with a detailed view of the nebula as seen by Hubble.

Credit:ESA/Hubble, A. Fujii, M. Kornmesser Music: Johan B. Monell (www.johanmonell.com)

The relative speed of the star was calculated by comparing observations made in 1998 with the recent ones. The speed of the newly discovered star is almost 30 times the speed of most of the nebula’s stellar inhabitants.

Astronomers already knew about two other runaway stars in the Orion Nebula which were most likely once part of a now-defunct multiple-star system. For years it was suspected that the original system contained more than just these two stars. Now, by virtue of accident and curiosity, Hubble may have found the missing third piece of this cosmic puzzle.

This ground-based image was taken by Japanese amateur astronomer Akira Fujii and shows the constellations Orion, Canis Minor and Canis major.

Credit:Akira Fujii

Whether the new star is indeed the missing — and the last — piece of the puzzle will require further observations. So will the answer to the question of why the original star system broke apart in the first place. While there are several theories — interactions with other, nearby stellar groups, or two of the stars getting too close to each other — none can be ruled out or confirmed yet.

And while the astronomers are looking for the answers to these questions, who knows what mystery they will find next?

Contacts and sources:
Mathias Jäger
ESA/Hubble

Source:

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