{"id":11545,"date":"2015-10-07T13:00:56","date_gmt":"2015-10-07T17:00:56","guid":{"rendered":"http:\/\/hobbyspace.com\/Blog\/?p=11545"},"modified":"2015-10-07T00:19:15","modified_gmt":"2015-10-07T04:19:15","slug":"hubble-telescope-spots-mysterious-ripples-racing-through-planet-forming-disc","status":"publish","type":"post","link":"https:\/\/hobbyspace.com\/Blog\/?p=11545","title":{"rendered":"Hubble telescope spots mysterious ripples racing through planet-forming disc"},"content":{"rendered":"

The\u00a0NASA\/ESA Hubble telescope<\/a>\u00a0team releases this new finding:<\/p>\n

Mysterious Ripples Found Racing Through Planet-forming Disc <\/a><\/strong><\/p>\n

Using images from the NASA\/ESA Hubble Space Telescope and ESO\u2019s Very Large Telescope, astronomers have discovered never-before-seen structures within a dusty disc surrounding a nearby star. The fast-moving wave-like features in the disc of the star AU Microscopii are unlike anything ever observed, or even predicted, before now. The origin and nature of these features present a new mystery for astronomers to explore. The results are published in the journal Nature on 8 October 2015.<\/p>\n

\"Using<\/a>
Using images from the NASA\/ESA Hubble Space Telescope and ESO\u2019s Very Large Telescope, astronomers have discovered fast-moving wave-like features in the dusty disc around the nearby star AU Microscopii. These odd structures are unlike anything ever observed, or even predicted, before now. The top row shows a Hubble image of the AU Mic disc from 2010, the middle row Hubble from 2011 and the bottom row is an image taken with the SPHERE instrument, mounted on the Very Large Telescope, from 2014. The black central circles show where the brilliant light of the central star has been blocked off to reveal the much fainter disc, and the position of the star is indicated schematically.<\/em><\/figcaption><\/figure>\n

AU Microscopii<\/a>, or AU Mic for short, is a young, nearby star surrounded by a large disc of dust [1]<\/a>. Studies of such\u00a0debris discs<\/a> can provide valuable clues about how planets, which form from these discs, are created.<\/p>\n

http:\/\/cdn.spacetelescope.org\/archives\/videos\/medium_podcast\/heic1521a.m4v<\/a><\/video><\/div>\n

Video<\/a>: Using images from the NASA\/ESA Hubble Space Telescope and ESO\u2019s Very Large Telescope, astronomers have discovered unique and totally unexpected structures within the dusty disc around the star AU Microscopii. Credits<\/a>.<\/em><\/p>\n

Astronomers have been searching AU Mic\u2019s disc for any signs of clumpy or warped features, as such signs might give away the location of possible planets. And in 2014 they used the\u00a0 powerful high-contrast imaging capabilities of ESO\u2019s newly installed SPHERE<\/a> instrument, mounted on the Very Large Telescope<\/a> for their search \u2014 and discovered something very unusual.<\/p>\n

\u201cOur observations have shown something unexpected,\u201d<\/em> explains Anthony Boccaletti of the Observatoire de Paris, France, lead author on the paper. \u201cThe images from SPHERE show a set of unexplained features in the disc which have an arch-like, or wave-like, structure, unlike anything that has ever been observed before.\u201d<\/em><\/p>\n

\"This<\/a>
This image shows the sky around the nearby young star AU Microscopii. It was created from images forming part of the Digitized Sky Survey 2. AU Mic appears just below the centre of the image as an orangish star of moderate brightness. Because the photographs through different coloured filters that were used to make this picture were taken many years apart, AU Mic appears double, as the star\u2019s own proper motion has moved it a small distance across the sky in the intervening time.<\/em><\/figcaption><\/figure>\n

Five wave-like arches at different distances from the star show up in the new images, reminiscent of ripples in water. After spotting the features in the SPHERE data the team turned to earlier images of the disc taken by the NASA\/ESA Hubble Space Telescope in 2010 and 2011 to see whether the features were also visible in these [2]<\/a>. They were not only able to identify the features on the earlier Hubble images \u2014 but they also discovered that they had changed over time. It turns out that these ripples are moving \u2014 and very fast!<\/p>\n

\u201cWe reprocessed images from the Hubble data and ended up with enough information to track the movement of these strange features over a four-year period,\u201d<\/em> explains team member Christian Thalmann (ETH Z\u00fcrich, Switzerland). \u201cBy doing this, we found that the arches are racing away from the star at speeds of up to about 40 000 kilometres\/hour!\u201d<\/em><\/p>\n

The features further away from the star seem to be moving faster than those closer to it. At least three of the features are moving so fast that they could well be escaping from the gravitational attraction of the star. Such high speeds rule out the possibility that these are conventional disc features caused by objects \u2014 like planets \u2014 disturbing material in the disc while orbiting the star. There must have been something else involved to speed up the ripples and make them move so quickly, meaning that they are a sign of something truly unusual [3]<\/a>.<\/p>\n

\u201cEverything about this find was pretty surprising!\u201d<\/em> comments co-author Carol Grady of Eureka Scientific, USA. \u201cAnd because nothing like this has been observed or predicted in theory we can only hypothesise when it comes to what we are seeing and how it came about.\u201d<\/em><\/p>\n

The team cannot say for sure what caused these mysterious ripples around the star. But they have considered and ruled out a series of phenomena as explanations, including the collision of two massive and rare asteroid-like objects releasing large quantities of dust, and spiral waves triggered by instabilities in the system\u2019s gravity.<\/p>\n

http:\/\/cdn.spacetelescope.org\/archives\/videos\/medium_podcast\/heic1521c.m4v<\/a><\/video><\/div>\n

Video<\/a>: This short timelapse sequence shows images of the debris disc around the nearby star AU Microscopii in 2010, 2011 and 2014. The two earlier images were from the NASA\/ESA Hubble Space Telescope and the final one from the new SPHERE instrument on ESO’s Very Large Telescope.\u00a0Credit:\u00a0ESO, ESA & NASA<\/em><\/p>\n

But other ideas that they have considered look more promising.<\/p>\n

\u201cOne explanation for the strange structure links them to the star\u2019s flares. AU Mic is a star with high flaring activity \u2014 it often lets off huge and sudden bursts of energy from on or near its surface,\u201d<\/em> explains co-author Glenn Schneider of Steward Observatory, USA. \u201cOne of these flares could perhaps have triggered something on one of the planets \u2014 if there are planets \u2014 like a violent stripping of material which could now be propagating through the disc, propelled by the flare\u2019s force.\u201d<\/em><\/p>\n

\u201cIt is very satisfying that SPHERE has proved to be very capable at studying discs like this in its first year of operation,\u201d<\/em>adds Jean-Luc Beuzit, who is both a co-author of the new study and also led the development of SPHERE itself.<\/p>\n

The team plans to continue to observe the AU Mic system with SPHERE and other facilities, including ALMA, to try to understand what is happening. But, for now, these curious features remain an unsolved mystery.<\/p>\n

http:\/\/cdn.spacetelescope.org\/archives\/videos\/medium_podcast\/heic1521b.m4v<\/a><\/video><\/div>\n

This video clip<\/a> takes the viewer from a broad view of the entire southern Milky Way into a closeup of the nearby star AU Microscopii, about 32 light-years from Earth. This star is young and surrounded by a dusty disc that features odd wave-like, rapidly moving features that are imperfectly understood.\u00a0Credit:\u00a0ESO\/Digitized Sky Survey 2\/N. Risinger (skysurvey.org<\/a>) .\u00a0Music: Johan Monell<\/a><\/em><\/p>\n

Notes<\/h3>\n

<\/a>[1] AU Microscopii lies just 32 light-years away from Earth. The disc essentially comprises asteroids that have collided with such vigour that they have been ground to dust.<\/p>\n

<\/a>[2] The data were gathered by Hubble\u2019s Space Telescope Imaging Spectrograph (STIS).<\/p>\n

<\/a>[3] The edge-on view of the disc complicates the interpretation of its three-dimensional structure.<\/p>\n","protected":false},"excerpt":{"rendered":"

The\u00a0NASA\/ESA Hubble telescope\u00a0team releases this new finding: Mysterious Ripples Found Racing Through Planet-forming Disc Using images from the NASA\/ESA Hubble Space Telescope and ESO\u2019s Very Large Telescope, astronomers have discovered never-before-seen structures within a dusty disc surrounding a nearby star. The fast-moving wave-like features in the disc of the star AU Microscopii are unlike anything … Continue reading Hubble telescope spots mysterious ripples racing through planet-forming disc<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[12],"tags":[],"class_list":["post-11545","post","type-post","status-publish","format-standard","hentry","category-astronomy"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p34aWK-30d","jetpack-related-posts":[{"id":12133,"url":"https:\/\/hobbyspace.com\/Blog\/?p=12133","url_meta":{"origin":11545,"position":0},"title":"ESO: The Flying Saucer’s protoplanetary disc is surprisingly cold","author":"TopSpacer","date":"February 3, 2016","format":false,"excerpt":"The latest\u00a0ESO\u00a0(European Southern Observatory) report: The Frigid Flying Saucer Astronomers have used the ALMA and IRAM telescopes to make the first direct measurement of the temperature of the large dust grains in the outer parts of a planet-forming disc around a young star. 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