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G\u00fcne\u015f Sistemi\u2019nin \u00f6tesinde ke\u015ffedilen yakla\u015f\u0131k 200 gezegenin, tahmin edildi\u011finden daha b\u00fcy\u00fck olabilece\u011fi ortaya \u00e7\u0131kt\u0131. Bu bulgu, evrende ya\u015fam aray\u0131\u015f\u0131n\u0131 k\u00f6kten etkileyebilir.<\/p>\n
Bu teori, NASA\u2019n\u0131n Transiting Exoplanet Survey Satellite (TESS) uydusu taraf\u0131ndan g\u00f6zlemlenen y\u00fczlerce \u00f6tegezegeni inceleyen bir ara\u015ft\u0131rma ekibine ait.<\/p>\n
TESS, gezegenleri, y\u0131ld\u0131zlar\u0131n\u0131n \u00f6n\u00fcnden ge\u00e7erken neden olduklar\u0131 karalt\u0131larla tespit ediyor. Ancak ara\u015ft\u0131rma ekibi, yak\u0131n y\u0131ld\u0131zlardan gelen \u0131\u015f\u0131\u011f\u0131n bu \u00f6l\u00e7\u00fcmleri “kirletebilece\u011fini” ve bu nedenle gezegenlerin ger\u00e7ekte oldu\u011fundan daha k\u00fc\u00e7\u00fck g\u00f6r\u00fcnebilece\u011fini tespit etti.<\/p>\n
Ara\u015ft\u0131rma ekibinin lideri, Kaliforniya \u00dcniversitesi Irvine kamp\u00fcs\u00fcnden Te Han, \u201cY\u00fczlerce \u00f6tegezegenin asl\u0131nda g\u00f6r\u00fcnd\u00fc\u011f\u00fcnden daha b\u00fcy\u00fck oldu\u011funu ke\u015ffettik. Bu, \u00f6tegezegenleri genel \u00f6l\u00e7ekte anlama bi\u00e7imimizi de\u011fi\u015ftiriyor\u201d dedi. Han\u2019a g\u00f6re bu durum, \u015fimdiye dek D\u00fcnya\u2019ya benzedi\u011fi san\u0131lan gezegenlerin say\u0131s\u0131n\u0131n ger\u00e7ekte daha az olabilece\u011fini g\u00f6steriyor.<\/p>\n
\u00d6tegezegenler, \u00e7ok uzak ve soluk olduklar\u0131ndan do\u011frudan g\u00f6r\u00fcnt\u00fclenmeleri olduk\u00e7a zor. Bu nedenle “transit y\u00f6ntemi” (yani bir gezegenin y\u0131ld\u0131z\u0131n\u0131n \u00f6n\u00fcnden ge\u00e7erken olu\u015fturdu\u011fu g\u00f6lgeyle tespit edilmesi) en etkili ke\u015fif y\u00f6ntemi olarak \u00f6ne \u00e7\u0131k\u0131yor. Bu y\u00f6ntem \u00f6zellikle y\u0131ld\u0131z\u0131na yak\u0131n ve b\u00fcy\u00fck gezegenleri tespit etmede daha ba\u015far\u0131l\u0131.<\/p>\n
Ekip, TESS\u2019in y\u00fczlerce \u00f6tegezegen g\u00f6zlemini toplad\u0131 ve bu gezegenleri boyutlar\u0131na g\u00f6re s\u0131n\u0131fland\u0131rd\u0131. Ard\u0131ndan, Avrupa Uzay Ajans\u0131\u2019n\u0131n Gaia g\u00f6revinden elde edilen y\u0131ld\u0131z verileriyle birlikte \u00f6zel bilgisayar modelleri kullanarak TESS verilerindeki \u0131\u015f\u0131k kirlili\u011fini \u00f6l\u00e7t\u00fc.<\/p>\n
Yeni veriler, D\u00fcnya benzeri san\u0131lan baz\u0131 gezegenlerin D\u00fcnya benzeri karasal gezegenler de\u011fil, b\u00fcy\u00fck okyanuslarla kapl\u0131 “hycean d\u00fcnyalar\u0131” olma ihtimalini art\u0131r\u0131yor. Bu t\u00fcr gezegenler, J\u00fcpiter’den k\u00fc\u00e7\u00fck gaz devleri olan Nept\u00fcn ve Uran\u00fcs’e daha \u00e7ok benziyor olabilir.<\/p>\n
Her ne kadar hycean d\u00fcnyalar\u0131 su bak\u0131m\u0131ndan zengin olsa da, bunlar\u0131n ya\u015fam i\u00e7in gerekli di\u011fer bile\u015fenleri ta\u015f\u0131mayabilecekleri d\u00fc\u015f\u00fcn\u00fcl\u00fcyor.<\/p>\n
Ara\u015ft\u0131rmac\u0131lar \u015fimdi, daha \u00f6nce ya\u015fanabilir olmad\u0131\u011f\u0131 d\u00fc\u015f\u00fcn\u00fclen b\u00fcy\u00fck gezegenleri yeniden incelemeyi planl\u0131yor.<\/p>\n
S\u00f6z konusu \u00e7al\u0131\u015fma, 14 Temmuz\u2019da bilimsel dergi Astrophysical Journal Letters’ta yay\u0131nland\u0131.<\/p>\n<\/div>\n