{"id":13814,"date":"2017-01-27T16:38:53","date_gmt":"2017-01-27T21:38:53","guid":{"rendered":"http:\/\/hobbyspace.com\/Blog\/?p=13814"},"modified":"2017-01-27T20:12:41","modified_gmt":"2017-01-28T01:12:41","slug":"video-exocomets-now-you-see-the-now-you-dont","status":"publish","type":"post","link":"https:\/\/hobbyspace.com\/Blog\/?p=13814","title":{"rendered":"Video: Exocomets &#8211; &#8220;Now you see them, now you don&#8217;t&#8221;"},"content":{"rendered":"<p><a href=\"http:\/\/exoplanets.org\/\" target=\"_blank\">Thousands of exoplanets<\/a> around other stars have now been detected (<a href=\"https:\/\/en.wikipedia.org\/wiki\/Methods_of_detecting_exoplanets\">mostly indirectly<\/a>) in the past couple of decades. Now <a href=\"https:\/\/en.wikipedia.org\/wiki\/Exocomet\" target=\"_blank\">exocomets<\/a> at other stars have also been detected. Here is a SETI Seminar about these distant <a href=\"https:\/\/en.wikipedia.org\/wiki\/Comet#Physical_characteristics\" target=\"_blank\">dirty snowballs<\/a>:<\/p>\n<p><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"1600\" height=\"900\" src=\"https:\/\/www.youtube.com\/embed\/FsCRNq0lGts?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/p>\n<p>From the caption:<\/p>\n<p style=\"padding-left: 30px;\"><em>Present technology does not enable us to view images of these kilometer-sized infalling bodies, but the evaporation of gaseous products liberated from exocomets that occurs close to a star can potentially cause small disruptions in the ambient circumstellar disk plasma. For circumstellar disks that are viewed \u201cedge-on\u201d this evaporating material may be directly observed through transient (night-to-night and hour-to-hour) gas absorption features seen at rapidly changing velocities. <\/em><\/p>\n<p style=\"padding-left: 30px;\"><em>Using high resolution spectrographs mounted to large aperture ground-based telescopes, we have discovered 15 young stars that harbor swarms of exocomets. In this lecture we briefly describe the physical attributes of comets in our own solar system and the instrumental observing techniques to detect the presence of evaporating exocomets present around stars with ages in the 10 \u2013 100 Myr range. <\/em><\/p>\n<p style=\"padding-left: 30px;\"><em>We note that this work has particular relevance to the dramatic fluctuations in the flux recorded towards \u201cTabby\u2019s star\u201d by the NASA Kepler Mission, that may be explained through the piling up of swarms of exocomets in front of the central star.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thousands of exoplanets around other stars have now been detected (mostly indirectly) in the past couple of decades. Now exocomets at other stars have also been detected. Here is a SETI Seminar about these distant dirty snowballs: From the caption: Present technology does not enable us to view images of these kilometer-sized infalling bodies, but &hellip; <a href=\"https:\/\/hobbyspace.com\/Blog\/?p=13814\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Video: Exocomets &#8211; &#8220;Now you see them, now you don&#8217;t&#8221;<\/span> <span class=\"meta-nav\">&rarr;<\/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":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[75,12],"tags":[],"class_list":["post-13814","post","type-post","status-publish","format-standard","hentry","category-asteroids","category-astronomy"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p34aWK-3AO","jetpack-related-posts":[{"id":24169,"url":"https:\/\/hobbyspace.com\/Blog\/?p=24169","url_meta":{"origin":13814,"position":0},"title":"ESO: Moon-forming disk observed around exoplanet","author":"TopSpacer","date":"July 22, 2021","format":false,"excerpt":"A new report from the European Southern Observatory (ESO): Astronomers make first clear detection of a moon-forming disc around an exoplanet Using the Atacama Large Millimetre\/submillimeter Array (ALMA), in which the European Southern Observatory (ESO) is a partner, astronomers have unambiguously detected the presence of a disc around a planet\u2026","rel":"","context":"In &quot;Astronomy&quot;","block_context":{"text":"Astronomy","link":"https:\/\/hobbyspace.com\/Blog\/?cat=12"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2021\/07\/eso2111a1-500x206.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":13390,"url":"https:\/\/hobbyspace.com\/Blog\/?p=13390","url_meta":{"origin":13814,"position":1},"title":"Citizen scientists find debris disk around red dwarf where planets can form","author":"TopSpacer","date":"October 21, 2016","format":false,"excerpt":"Another example\u00a0of citizen scientists contributing to a published scientific finding: Citizen Scientists Discover Potential New Exoplanet Hunting Ground Via a NASA-led citizen science project, eight people with no formal training in astrophysics helped discover what could be a fruitful new place to search for planets outside our solar system \u2013\u2026","rel":"","context":"In &quot;Astronomy&quot;","block_context":{"text":"Astronomy","link":"https:\/\/hobbyspace.com\/Blog\/?cat=12"},"img":{"alt_text":"awi0005x3s-cropped1","src":"https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/10\/awi0005x3s.cropped1.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":16313,"url":"https:\/\/hobbyspace.com\/Blog\/?p=16313","url_meta":{"origin":13814,"position":2},"title":"ESO: VLT captures first confirmed image of a planet forming","author":"TopSpacer","date":"July 2, 2018","format":false,"excerpt":"A new report from ESO\u00a0(European Southern Observatory): First Confirmed Image of Newborn Planet Caught with ESO\u2019s VLT Spectrum reveals cloudy atmosphere SPHERE, a planet-hunting instrument on ESO\u2019s Very Large Telescope, has captured the first confirmed image of a planet caught in the act of forming in the dusty disc surrounding\u2026","rel":"","context":"In &quot;Astronomy&quot;","block_context":{"text":"Astronomy","link":"https:\/\/hobbyspace.com\/Blog\/?cat=12"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2018\/06\/eso1821a1.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":26020,"url":"https:\/\/hobbyspace.com\/Blog\/?p=26020","url_meta":{"origin":13814,"position":3},"title":"ESO: Two exoplanets may share same orbit","author":"TopSpacer","date":"July 19, 2023","format":false,"excerpt":"A new report from the European Southern Observatory (ESO): Does this exoplanet have a sibling sharing the same orbit? Using the Atacama Large Millimeter\/submillimeter Array (ALMA), astronomers have found the possible \u2018sibling\u2019 of a planet orbiting a distant star. The team has detected a cloud of debris that might be\u2026","rel":"","context":"In &quot;Astronomy&quot;","block_context":{"text":"Astronomy","link":"https:\/\/hobbyspace.com\/Blog\/?cat=12"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2023\/07\/eso2311a1-e1689612879200-500x365.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":21067,"url":"https:\/\/hobbyspace.com\/Blog\/?p=21067","url_meta":{"origin":13814,"position":4},"title":"ESO: ALMA spots red giant engulfing companion star","author":"TopSpacer","date":"February 5, 2020","format":false,"excerpt":"The latest report from the European Southern Observatory (ESO): ALMA catches beautiful outcome of stellar fight Astronomers using the Atacama Large Millimeter\/submillimeter Array (ALMA), in which ESO is a partner, have spotted a peculiar gas cloud that resulted from a confrontation between two stars. One star grew so large it\u2026","rel":"","context":"In &quot;Astronomy&quot;","block_context":{"text":"Astronomy","link":"https:\/\/hobbyspace.com\/Blog\/?cat=12"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2020\/02\/eso2002a1-500x360.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":19854,"url":"https:\/\/hobbyspace.com\/Blog\/?p=19854","url_meta":{"origin":13814,"position":5},"title":"Space sciences roundup &#8211; Oct.4.2019","author":"TopSpacer","date":"October 4, 2019","format":false,"excerpt":"A sampling of recent articles, videos, and images from space-related science news items (find previous roundups here): Astronomy ** Enigmatic radio burst illuminates a galaxy\u2019s tranquil \u200bhalo | ESO Astronomers using ESO\u2019s Very Large Telescope have for the first time observed that a fast radio burst passed through a galactic\u2026","rel":"","context":"In &quot;Astronomy&quot;","block_context":{"text":"Astronomy","link":"https:\/\/hobbyspace.com\/Blog\/?cat=12"},"img":{"alt_text":" Saturn as seen by Hubble Space Telescope\u2019s Wide Field Camera","src":"https:\/\/i0.wp.com\/hobbyspace.com\/Blog\/wp-content\/uploads\/2019\/10\/heic1917a1-500x318.jpg?resize=350%2C200","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=\/wp\/v2\/posts\/13814","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=13814"}],"version-history":[{"count":2,"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=\/wp\/v2\/posts\/13814\/revisions"}],"predecessor-version":[{"id":13816,"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=\/wp\/v2\/posts\/13814\/revisions\/13816"}],"wp:attachment":[{"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13814"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13814"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hobbyspace.com\/Blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13814"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}