{"id":941,"date":"2011-08-20T21:34:00","date_gmt":"2011-08-21T00:34:00","guid":{"rendered":"http:\/\/scienceblogs.com.br\/hypercubic\/2011\/08\/tres-2b-o-planeta-negao\/"},"modified":"2011-08-20T21:34:00","modified_gmt":"2011-08-21T00:34:00","slug":"tres-2b-o-planeta-negao","status":"publish","type":"post","link":"https:\/\/www.blogs.unicamp.br\/hypercubic\/2011\/08\/tres-2b-o-planeta-negao\/","title":{"rendered":"&gt;TrES-2b, o Planeta Neg\u00e3o"},"content":{"rendered":"<p>&gt;<\/p>\n<table align=\"center\" cellpadding=\"0\" cellspacing=\"0\" class=\"tr-caption-container\" style=\"margin-left: auto;margin-right: auto;text-align: center\">\n<tbody>\n<tr>\n<td style=\"text-align: center\"><a href=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2011\/12\/TrES-2b1.jpg\" data-rel=\"lightbox-image-0\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img decoding=\"async\" border=\"0\" src=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2011\/12\/TrES-2b1.jpg\" \/><\/a><\/td>\n<\/tr>\n<tr>\n<td class=\"tr-caption\" style=\"text-align: center\">Concep\u00e7\u00e3o art\u00edstica de TrES-2b, o planeta mais rubro-negro conhecido<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><\/p>\n<div style=\"text-align: justify\">Tente imaginar alguma coisa mais preta (ou negra ou afro-descendente) que carv\u00e3o. Agora tente imaginar um planeta inteiro dessa cor. Foi exatamente isso que o telesc\u00f3pio espacial Kepler descobriu na semana passada.<\/div>\n<div style=\"text-align: justify\"><\/div>\n<div style=\"text-align: justify\">Distante apenas 5 milh\u00f5es de quil\u00f4metros de sua estrela-m\u00e3e, TrES-2 \u2014 e a 750 anos-luz da Terra \u2014, o gigante gasoso chamado TrES-2b arde a cerca de 980\u00baC. Apesar disso, aquele mundo imenso e infernal aparentemente n\u00e3o reflete quase nenhuma luz que recebe.<\/div>\n<div style=\"text-align: justify\"><\/div>\n<div style=\"text-align: justify\">David Kipping, l\u00edder da equipe que descobriu o planeta neg\u00e3o confirma: \u201c\u00e9 menos refetivo que o carv\u00e3o ou mesmo a mais negra tinta acr\u00edlica \u2014 de longe o planeta mais obscuro j\u00e1 descoberto\u201d. Kipping, astr\u00f4nomo do Harvard-Smithsonian Center for Astrophysics, em Cambridge, Massachussets d\u00e1 uma ideia da apar\u00eancia do TrES-2b: \u201cSe pud\u00e9ssemos v\u00ea-lo de perto, ele pareceria uma bola de g\u00e1s quase preta, com uma t\u00eanue faixa vermelha brilhante&nbsp;\u2014&nbsp;um verdadeiro exotismo entre os exoplanetas.\u201d<\/div>\n<div style=\"text-align: justify\"><\/div>\n<p><a name='more'><\/a><\/p>\n<div style=\"text-align: justify\"><b><span class=\"Apple-style-span\" style=\"font-family: Georgia,'Times New Roman',serif;font-size: large\">Sombra da sombra<\/span><\/b><\/div>\n<div style=\"text-align: justify\">O planeta, evidentemente, n\u00e3o foi descoberto por observa\u00e7\u00e3o direta. Mesmo orbitando ao redor da Terra e sendo projetado especialmente para buscar planetas extrassolares, o observat\u00f3rio Kepler encontrou esse planeta rubro-negro (mais para negro) atrav\u00e9s do m\u00e9todo de tr\u00e2nsito. Quando um planeta passa diante de seu astro-rei, a luz de seu sol diminui, ainda que por fra\u00e7\u00f5es min\u00fasculas. Ou, se preferir, \u00e9 mais ou menos um microeclipse estelar. Se o fen\u00f4meno se repete periodicamente e se a estrela reagir gravitacionalmente a esse movimento orbital, pode haver um planeta l\u00e1.&nbsp;<\/div>\n<div style=\"text-align: justify\"><\/div>\n<div style=\"text-align: justify\">Mas, se n\u00e3o houve observa\u00e7\u00e3o direta, como sabemos que esse planeta \u00e9 t\u00e3o escuro? Simples: um pouco antes de eclipsar seu sol, todo planeta passa por uma \u201cfase crescente\u201d, quando \u00e9 capaz de refletir a luz que recebe. No caso desse planeta, a luminosidade refletida&nbsp;\u2014&nbsp;chamada de <i>albedo <\/i>pelos atr\u00f4nomos&nbsp;\u2014&nbsp;era de aproximadamente de 6,5 partes por milh\u00e3o (!) em rela\u00e7\u00e3o ao brilho da estrela TrES-2. \u00c9 o menor sinal fotom\u00e9trico j\u00e1 registrado.<\/div>\n<div style=\"text-align: justify\"><\/div>\n<div style=\"text-align: justify\"><span class=\"Apple-style-span\" style=\"font-family: Georgia,'Times New Roman',serif;font-size: large\"><b>O Mist\u00e9rio Negro de TrES-2b<\/b><\/span><\/div>\n<div style=\"text-align: justify\">Parece t\u00edtulo de fic\u00e7\u00e3o cient\u00edfica barata\u00b9, mas \u00e9 s\u00e9rio. Ningu\u00e9m sabe ainda por que o TrES-2b \u00e9 t\u00e3o escuro. Os modelos de computador mais recentes indicavam que um J\u00fapiter quente&nbsp;\u2014&nbsp;um gigante gasoso que fica muito pr\u00f3ximo de suas estrela&nbsp;\u2014&nbsp;s\u00f3 poderia ser t\u00e3o obscuro quanto Merc\u00fario, que reflete apenas 10% da luz que vem do Sol. Mas o TrES-2b \u00e9 t\u00e3o escuro que reflete apenas 1% da luz que vem de seu sol. \u00c9 um albedo baix\u00edssimo. O albedo da Terra varia de 37 a 39% (por causa das nuvens) e o de Jupiter \u00e9 de 52%. V\u00eanus \u00e9 o planeta mais brilhante que conhecemos: reflete 90% da luz solar.&nbsp;<\/div>\n<div style=\"text-align: justify\"><\/div>\n<div style=\"text-align: justify\">Se as medidas estiverem realmente corretas, porque o planeta \u00e9 t\u00e3o escuro? \u201cAlguns t\u00eam proposto\u201d&nbsp;\u2014&nbsp;&nbsp;explica Kipping&nbsp;\u2014&nbsp;\u201cque essa escurid\u00e3o pode ser causada por uma enorme abund\u00e2ncia de s\u00f3dio e \u00f3xido de&nbsp;tit\u00e2nio&nbsp;gasosos.\u201d&nbsp;<\/div>\n<div style=\"text-align: justify\"><\/div>\n<div style=\"text-align: justify\">C\u00e9us de tit\u00e2nio podem parecer fod\u00e1sticos, mas essa hip\u00f3tese n\u00e3o empolga o descobridor: \u201cMas \u00e9 mais prov\u00e1vel que haja algo ex\u00f3tico l\u00e1, algo que nunca pensamos antes. \u00c9 este mist\u00e9rio que eu considero t\u00e3o excitante sobre essa descoberta.\u201d Ou talvez seja apenas uma combina\u00e7\u00e3o de morma\u00e7o e falta de filtro solar&#8230;<\/div>\n<div style=\"text-align: justify\"><\/div>\n<div style=\"text-align: justify\">Enfim, como TrES-2b \u00e9 um nome um tanto sem-gra\u00e7a para um planeta t\u00e3o interessante, j\u00e1 h\u00e1 um apelido: Erebus, o deus grego da escurid\u00e3o e consorte da deusa da noite, Nyx. Mas eu acho que um nome melhor (e menos euroc\u00eantrico) seria Kuk (ou Keku\u00b2), o deus (ou deusa, por ser andr\u00f3gino\/a) da escurid\u00e3o primordial na mitologia eg\u00edpcia (foi mal por todos esses par\u00eanteses, mas \u00e9 um v\u00edcio pra mim).&nbsp;<\/div>\n<div style=\"text-align: justify\"><\/div>\n<div style=\"text-align: justify\">___________________________<\/div>\n<div style=\"text-align: justify\"><span class=\"Apple-style-span\" style=\"font-family: Georgia,'Times New Roman',serif;font-size: x-small\">\u00b9 Pensando bem, quase toda Fic\u00e7\u00e3o Cient\u00edfica \u00e9 barata em termos liter\u00e1rios. Mas eu <i>adoro <\/i>isso.<\/span><\/div>\n<div style=\"text-align: justify\"><span class=\"Apple-style-span\" style=\"font-family: Georgia,'Times New Roman',serif;font-size: x-small\">\u00b2 Ou talvez n\u00e3o fosse uma ideia t\u00e3o boa, j\u00e1 que depois de <i>buraco negro<\/i>, chamar um planeta negro de <i>Keku <\/i>s\u00f3 nos traria uma coisa: mais piadas infames.<\/span><\/div>\n","protected":false},"excerpt":{"rendered":"<p>&gt; Concep\u00e7\u00e3o art\u00edstica de TrES-2b, o planeta mais rubro-negro conhecido Tente imaginar alguma coisa mais preta (ou negra ou afro-descendente) que carv\u00e3o. Agora tente imaginar um planeta inteiro dessa cor. Foi exatamente isso que o telesc\u00f3pio espacial Kepler descobriu na semana passada. Distante apenas 5 milh\u00f5es de quil\u00f4metros de sua estrela-m\u00e3e, TrES-2 \u2014 e a [&hellip;]<\/p>\n","protected":false},"author":486,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_monsterinsights_skip_tracking":false,"material-hide-sections":[],"pgc_sgb_lightbox_settings":"","_vp_format_video_url":"","_vp_image_focal_point":[],"footnotes":""},"categories":[25,53,102,167,202,220,222,236],"tags":[],"class_list":["post-941","post","type-post","status-publish","format-standard","hentry","category-astronomia","category-ciencia","category-espaco","category-humor","category-maravilhas-do-infinito","category-misterio","category-mitologia","category-noticias"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>&gt;TrES-2b, o Planeta Neg\u00e3o - hypercubic<\/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:\/\/www.blogs.unicamp.br\/hypercubic\/2011\/08\/tres-2b-o-planeta-negao\/\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Renato Pincelli\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/08\\\/tres-2b-o-planeta-negao\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/08\\\/tres-2b-o-planeta-negao\\\/\"},\"author\":{\"name\":\"Renato Pincelli\",\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/#\\\/schema\\\/person\\\/c7be1e2811d061a75d3b4f4960eb53bd\"},\"headline\":\"&gt;TrES-2b, o Planeta Neg\u00e3o\",\"datePublished\":\"2011-08-21T00:34:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/08\\\/tres-2b-o-planeta-negao\\\/\"},\"wordCount\":723,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/08\\\/tres-2b-o-planeta-negao\\\/#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/scienceblogs.com.br\\\/hypercubic\\\/files\\\/2011\\\/12\\\/TrES-2b1.jpg\",\"articleSection\":[\"astronomia\",\"ci\u00eancia\",\"espa\u00e7o\",\"humor\",\"maravilhas do infinito\",\"mist\u00e9rio\",\"mitologia\",\"not\u00edcias\"],\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/08\\\/tres-2b-o-planeta-negao\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/08\\\/tres-2b-o-planeta-negao\\\/\",\"url\":\"https:\\\/\\\/www.blogs.unicamp.br\\\/hypercubic\\\/2011\\\/08\\\/tres-2b-o-planeta-negao\\\/\",\"name\":\"&gt;TrES-2b, o Planeta Neg\u00e3o - 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