{"id":1059,"date":"2019-11-18T13:55:38","date_gmt":"2019-11-18T13:55:38","guid":{"rendered":"http:\/\/horizon.peachpuff-wolverine-566518.hostingersite.com\/?p=1059"},"modified":"2019-11-18T13:55:38","modified_gmt":"2019-11-18T13:55:38","slug":"zeroing-in-on-baby-exoplanets-could-reveal-how-they-form","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/horizon\/1059\/zeroing-in-on-baby-exoplanets-could-reveal-how-they-form\/","title":{"rendered":"Zeroing in on baby exoplanets could reveal how they form"},"content":{"rendered":"<div class=\"article-info article-info_scroll print-hidden article-info_top\">\n<h3><strong>Twenty-four years ago, Swiss astronomers Michel Mayor and Didier Queloz discovered the first planet orbiting a sun-like star outside our solar system \u2013 a milestone recognised by this year\u2019s Nobel prize in physics. Today we know of thousands more \u2018exoplanets\u2019, and researchers are now trying to understand when and how they form<\/strong><strong>.<\/strong><\/h3>\n<\/div>\n<div class=\"field field-name-body field-type-text-with-summary field-label-hidden\">\n<div class=\"field-items\">\n<div class=\"field-item even\">\n<p class=\"selectionShareable\">The known exoplanets are certainly an eclectic bunch. They range in size from small rocky planets, like Earth, to gas giants that are many times bigger than Jupiter.<\/p>\n<p class=\"selectionShareable\">Some have meandering orbits, whereas others orbit not one star but two. Some have the modest mass and temperatures that are thought necessary to support life, while some are hellish balls of heat and crushing gravity. Some exoplanets appear to orbit their stars alone, while others orbit along with several other planets, like Earth in our solar system.<\/p>\n<p class=\"selectionShareable\">The vast majority of those we\u2019ve discovered so far, however, are Earth- to Jupiter-sized planets that orbit very close to their host stars \u2013 often closer than Mercury orbits the sun. Astronomers are trying to understand how these close-orbiting planets came into existence by studying examples in different \u2013 preferably early \u2013 stages of formation.<\/p>\n<p class=\"selectionShareable\">But young, faint exoplanets are hard to make out amid the glare of a highly active parent star. As a group led by Dr Jerome Bouvier at the Grenoble Institute of Planetology and Astrophysics in France asks on its website: \u2018Have you ever tried to listen to Sibelius next to a jackhammer?\u2019<\/p>\n<p class=\"selectionShareable\">To see through the noise, Dr Bouvier and colleagues are employing some of the world\u2019s most powerful telescope arrays, such as the European Southern Observatory\u2019s Very Large Telescope Interferometer on the Paranal mountain in Chile. Meanwhile, computer simulations of how a young planet disturbs the disc of gas and dust surrounding its nascent star will help them know how to spot young exoplanets in real space.<\/p>\n<div class=\"quote-view quotesBlock quote_horizontal\">\n<blockquote>\n<p class=\"selectionShareable\">&#8216;One million years \u2013 (for an exoplanet) that corresponds to about two days on the scale of a human lifetime.&#8217;<\/p>\n<p class=\"selectionShareable\">Prof. Jerome Bouvier, Grenoble Institute of Planetology and Astrophysics, France<\/p>\n<\/blockquote>\n<\/div>\n<p class=\"selectionShareable\"><strong>Close-orbiting<\/strong><\/p>\n<p class=\"selectionShareable\">The researchers hope that their project,\u00a0<a href=\"https:\/\/cordis.europa.eu\/project\/rcn\/210985\/factsheet\/en\" target=\"_blank\" rel=\"noopener noreferrer\">SPIDI<\/a>, will lead to the discovery of close-orbiting exoplanets as they are forming, when they are about a million years old. \u2018One million years \u2013\u00a0that corresponds to about two days on the scale of a human lifetime,\u2019 said Dr Bouvier.<\/p>\n<p class=\"selectionShareable\">One and a half years in, the project is still too new to have delivered any results. But by measuring the properties of close-orbiting exoplanets in their baby phases, the researchers aim to understand how they are born.<\/p>\n<p class=\"selectionShareable\">The project will probably not shed light on the formation of exoplanets with other types of orbit, however. And the type of orbit is important, because it determines the conditions on an exoplanet\u2019s surface \u2013\u00a0and potentially whether it is habitable.<\/p>\n<p class=\"selectionShareable\">Each type of exoplanet and exoplanet orbit could be studied individually. But Professor Richard Alexander of the University of Leicester in the UK believes that by studying different types of exoplanets orbiting different stars there is less chance of missing important processes that help make up the big picture of planetary formation.<\/p>\n<p class=\"selectionShareable\">\u2018To use a very poor analogy: if you could only see one part of an elephant \u2013 its trunk, say \u2013 you would end up with a very different understanding of elephants to someone who could only see its toes,\u2019 he said. \u2018By looking at different types of (exoplanet) systems, we&#8217;re trying our best to step back and look at the whole of the \u201cplanet-formation elephant\u201d, rather than just one part of it.\u2019<\/p>\n<p class=\"selectionShareable\"><strong>Star&#8217;s disc<\/strong><\/p>\n<p class=\"selectionShareable\">Somehow, the way that a young exoplanet interacts with its star\u2019s disc of dust and gas determines the type of exoplanet that will ultimately form. Prof. Alexander\u2019s project,\u00a0<a href=\"https:\/\/cordis.europa.eu\/project\/rcn\/202584\/factsheet\/en\" target=\"_blank\" rel=\"noopener noreferrer\">BuildingPlanS<\/a>, involves developing computer simulations that predict the effect of different formation processes.<\/p>\n<p class=\"selectionShareable\">These simulations can be tested against observations to see whether the processes they describe are accurate.<\/p>\n<p class=\"selectionShareable\">The approach is paying off. In\u00a0<a href=\"https:\/\/ui.adsabs.harvard.edu\/abs\/2018MNRAS.475.5296D\/abstract\" target=\"_blank\" rel=\"noopener noreferrer\">one recent study<\/a>, led by Prof. Alexander\u2019s colleague Dr Dipierro at the University of Leicester, UK, the computer simulations suggested that a ring observed in the disc of a star called Elias 24 is the path cleared by an orbiting, as-yet unidentified, gas-giant planet.<\/p>\n<p class=\"selectionShareable\">To really learn something new about planetary formation, however, the researchers want to predict something that has not yet been observed. \u2018Then we can use new observations to test the physics directly, and maximise the understanding we gain from all this new knowledge,\u2019 said Prof. Alexander.<\/p>\n<p class=\"selectionShareable\">Astrophysicists know that, in the very beginning, planets form as dust and gas accumulate under gravity. But this earliest phase of planet formation is especially hard to study.<\/p>\n<p class=\"selectionShareable\">The trouble is that the dust and the gas around young stars each evolve in very complex ways, and studying how they form planets together requires a lot of expertise and computing power. Traditionally, therefore, dust and gas have been simulated as separate processes.<\/p>\n<p class=\"selectionShareable\"><strong>\u200bKnotted<\/strong><\/p>\n<p class=\"selectionShareable\">But as Dr Mario Flock of the Max Planck Institute for Astronomy in Heidelberg, Germany, points out, the two processes cannot be truly separated. For instance, the presence of dust can reduce turbulence in the gas, while the turbulence of the gas impacts the size and fragmentation of the dust grains.<\/p>\n<p class=\"selectionShareable\">In a project called\u00a0<a href=\"https:\/\/cordis.europa.eu\/project\/rcn\/212086\/factsheet\/en\" target=\"_blank\" rel=\"noopener noreferrer\">UFOS<\/a>, Dr Flock and colleagues are starting to unite gas and dust simulations for the first time, to accurately describe some of the earliest stages of planetary formation. Their hope is to explain some of the features seen in very young stellar disks \u2013 spirals and rings \u2013 as the footprints of embryonic dust grains clumping together.<\/p>\n<p class=\"selectionShareable\">The biggest challenge here, says Dr Flock, is finding the right scales of time and space over which gas and dust interact with the most influence. \u2018That requires huge expertise in magneto-hydrodynamics, dust coagulation, numerical tools and high-performance computing.<\/p>\n<p class=\"selectionShareable\">\u2018If we succeed to link the sites of grain growth and planet formation with current observations \u2013\u00a0that would be the highest goal,\u2019 he continued. \u2018It would help us to understand what\u2019s currently happening in systems we observe now.\u2019<\/p>\n<p class=\"selectionShareable\"><em>The research in this article was funded by the EU. If you liked this article, please consider sharing it on social media.<\/em><\/p>\n<p><em>Originally published on <a href=\"https:\/\/horizon-magazine.eu\/\">Horizon<\/a>.<\/em><\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Twenty-four years ago, Swiss astronomers Michel Mayor and Didier Queloz discovered the first planet orbiting a sun-like star outside our solar system \u2013 a milestone recognised by this year\u2019s Nobel prize in physics. Today we know of thousands more \u2018exoplanets\u2019, and researchers are now trying to understand when and how they form. The known exoplanets &#8230; <a title=\"Zeroing in on baby exoplanets could reveal how they form\" class=\"read-more\" href=\"https:\/\/scienceblog.com\/horizon\/1059\/zeroing-in-on-baby-exoplanets-could-reveal-how-they-form\/\" aria-label=\"Read more about Zeroing in on baby exoplanets could reveal how they form\">Read more<\/a><\/p>\n","protected":false},"author":311,"featured_media":1060,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"generate_page_header":"","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":[15],"tags":[323,169,79,24,35],"class_list":["post-1059","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-space","tag-exoplanets","tag-frontier-research","tag-research","tag-science","tag-space"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Zeroing in on baby exoplanets could reveal how they form - Horizon Magazine Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scienceblog.com\/horizon\/1059\/zeroing-in-on-baby-exoplanets-could-reveal-how-they-form\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Zeroing in on baby exoplanets could reveal how they form\" \/>\n<meta property=\"og:description\" content=\"Twenty-four years ago, Swiss astronomers Michel Mayor and Didier Queloz discovered the first planet orbiting a sun-like star outside our solar system \u2013 a milestone recognised by this year\u2019s Nobel prize in physics. Today we know of thousands more \u2018exoplanets\u2019, and researchers are now trying to understand when and how they form. The known exoplanets ... 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