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G\u00fcne\u015f\u2019e benzeyen bir y\u0131ld\u0131z\u0131n etraf\u0131nda d\u00f6nen HD 137010 b adl\u0131 cismin, ya\u015fanabilir b\u00f6lgede yer alma ihtimali var. Bu \u00f6zellik, onu \u015fimdiye kadar ke\u015ffedilen en \u201cD\u00fcnya benzeri\u201d adaylardan biri haline getiriyor.<\/p>\n
NASA\u2019dan bilim insanlar\u0131, G\u00fcne\u015f\u2019e benzeyen bir y\u0131ld\u0131z\u0131n etraf\u0131nda dola\u015fan ve boyutlar\u0131 ile y\u0131ld\u0131z\u0131na uzakl\u0131\u011f\u0131 D\u00fcnya\u2019ya epey yak\u0131n olan yeni bir gezegen aday\u0131 tespit etti.<\/p>\n
Di\u011fer bir deyi\u015fle, HD 137010 b ad\u0131 verilen \u00f6tegezegen aday\u0131n\u0131n, y\u0131ld\u0131z\u0131n\u0131n ya\u015fanabilir b\u00f6lgesinde yer alma ihtimali var. Bu \u00f6zellik, onu \u015fimdiye kadar ke\u015ffedilen en \u201cD\u00fcnya benzeri\u201d adaylardan biri haline getiriyor.<\/p>\n
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Gezegenin varl\u0131\u011f\u0131n\u0131n kesinle\u015fmesi i\u00e7in yeni g\u00f6zlemler gerekiyor ama ke\u015ffin temelini olu\u015fturan ve 10 y\u0131l\u0131 a\u015fk\u0131n s\u00fcre \u00f6nce Kepler Uzay Teleskobu taraf\u0131ndan toplanan verilerin kalitesi, ara\u015ft\u0131rmac\u0131lar\u0131 takip \u00e7al\u0131\u015fmalar\u0131na dair umutland\u0131r\u0131yor.<\/p>\n
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Ara\u015ft\u0131rma ekibi yay\u0131mlad\u0131klar\u0131 makalede, \u201cBu aday, D\u00fcnya\u2019ya benzer yar\u0131\u00e7ap ve y\u00f6r\u00fcnge \u00f6zelliklerine sahip olup, ayn\u0131 zamanda ayr\u0131nt\u0131l\u0131 takip g\u00f6zlemlerine uygun parlakl\u0131kta bir G\u00fcne\u015f benzeri y\u0131ld\u0131z\u0131n \u00f6n\u00fcnden ge\u00e7en (transit yapan) ilk gezegen aday\u0131d\u0131r\u201d ifadelerini kulland\u0131.<\/p>\n
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KEPLER VER\u0130LER\u0130 YEN\u0130DEN \u0130NCELEND\u0130<\/strong><\/p>\n <\/p>\n NASA\u2019n\u0131n a\u00e7\u0131klamas\u0131na g\u00f6re, ara\u015ft\u0131rma ekibi, Kepler\u2019in d\u00f6rt y\u0131ll\u0131k g\u00f6rev s\u00fcresi boyunca toplad\u0131\u011f\u0131 verileri yeni analiz teknikleriyle yeniden inceledi. Ama\u00e7, G\u00fcne\u015f benzeri y\u0131ld\u0131zlar\u0131n ya\u015fanabilir b\u00f6lgelerinde D\u00fcnya b\u00fcy\u00fckl\u00fc\u011f\u00fcnde gezegenler bulmakt\u0131.<\/p>\n <\/p>\n Ara\u015ft\u0131rmac\u0131lar, D\u00fcnya\u2019dan yakla\u015f\u0131k 146 \u0131\u015f\u0131k y\u0131l\u0131 uzakl\u0131kta bulunan G\u00fcne\u015f benzeri bir y\u0131ld\u0131z\u0131n etraf\u0131nda ger\u00e7ekle\u015fen zay\u0131f ama tutarl\u0131 bir ge\u00e7i\u015f sinyali tespit etti.<\/p>\n <\/p>\n Analizlere g\u00f6re gezegen aday\u0131, y\u0131ld\u0131z\u0131n\u0131n \u00f6n\u00fcnden yakla\u015f\u0131k 10 saat boyunca ge\u00e7i\u015f yap\u0131yor. Kar\u015f\u0131la\u015ft\u0131rma yapmak gerekirse, D\u00fcnya\u2019n\u0131n G\u00fcne\u015f \u00f6n\u00fcnden ge\u00e7i\u015fi d\u0131\u015f bir g\u00f6zlemci i\u00e7in yakla\u015f\u0131k 13 saat s\u00fcrerdi.<\/p>\n <\/p>\n D\u00dcNYA\u2019YLA \u00c7ARPICI BENZERL\u0130KLER<\/strong><\/p>\n <\/p>\n Yeni gezegen aday\u0131n\u0131n y\u00f6r\u00fcnge s\u00fcresinin yakla\u015f\u0131k 355 g\u00fcn oldu\u011fu tahmin ediliyor; bu da D\u00fcnya y\u0131l\u0131na epey yak\u0131n. Ayr\u0131ca gezegenin, D\u00fcnya\u2019dan yaln\u0131zca birka\u00e7 y\u00fczde puan daha b\u00fcy\u00fck oldu\u011fu d\u00fc\u015f\u00fcn\u00fcl\u00fcyor.<\/p>\n <\/p>\n En dikkat \u00e7ekici noktalardan biri de gezegenin G\u00fcne\u015f\u2019e benzeyen bir y\u0131ld\u0131z\u0131n etraf\u0131nda d\u00f6nmesi. Zira bug\u00fcne kadar ke\u015ffedilen D\u00fcnya boyutundaki gezegenlerin \u00e7o\u011fu, daha s\u00f6n\u00fck k\u0131rm\u0131z\u0131 veya kahverengi c\u00fcce y\u0131ld\u0131zlar\u0131n etraf\u0131nda bulunuyordu.<\/p>\n <\/p>\n E\u011fer do\u011frulan\u0131rsa, HD 137010 b; D\u00fcnya b\u00fcy\u00fckl\u00fc\u011f\u00fc, D\u00fcnya\u2019ya benzer y\u00f6r\u00fcnge s\u00fcresi ve G\u00fcne\u015f benzeri bir y\u0131ld\u0131z etraf\u0131nda dolanma \u00f6zelliklerini ayn\u0131 anda ta\u015f\u0131yan ilk gezegen olacak.<\/p>\n <\/p>\n Ara\u015ft\u0131rmac\u0131lar, gezegenin y\u0131ld\u0131z\u0131n\u0131n ya\u015fanabilir b\u00f6lgesinde yer alma ihtimalini de inceledi. Ancak y\u0131ld\u0131z\u0131n G\u00fcne\u015f\u2019ten yakla\u015f\u0131k y\u00fczde 20 daha s\u00f6n\u00fck olmas\u0131, gezegenin ortalama y\u00fczey s\u0131cakl\u0131\u011f\u0131n\u0131n Mars\u2019a daha yak\u0131n olabilece\u011fini g\u00f6steriyor. Modellere g\u00f6re y\u00fczey s\u0131cakl\u0131\u011f\u0131 eksi 68 derece seviyelerine kadar d\u00fc\u015febilir.<\/p>\n <\/p>\n Buna ra\u011fmen ekip, baz\u0131 senaryolarda gezegenin y\u00fczeyinde s\u0131v\u0131 su bulunmas\u0131n\u0131n h\u00e2l\u00e2 m\u00fcmk\u00fcn olabilece\u011fini belirtiyor. \u00d6zellikle karbondioksit bak\u0131m\u0131ndan zengin bir atmosfere sahip olmas\u0131 durumunda, gezegen y\u00fczeyinde s\u0131v\u0131 su korunabilir.<\/p>\n <\/p>\n Yap\u0131lan hesaplamalara g\u00f6re, gezegenin y\u0131ld\u0131z\u0131n \u201ctemkinli\u201d ya\u015fanabilir b\u00f6lgesi i\u00e7inde yer alma ihtimali y\u00fczde 40, daha geni\u015f tan\u0131mlanan \u201ciyimser\u201d ya\u015fanabilir b\u00f6lgeye dahil edilirse bu oran y\u00fczde 51\u2019e \u00e7\u0131k\u0131yor.<\/p>\n <\/p>\n \u00c7al\u0131\u015fma, Astrophysical Journal Letters adl\u0131 hakemli bilimsel dergide yay\u0131mland\u0131.<\/p>\n