{"id":35919,"date":"2026-09-17T06:00:00","date_gmt":"2026-09-17T06:00:00","guid":{"rendered":"https:\/\/egeajans.ege.edu.tr\/?p=35919"},"modified":"2026-09-17T07:46:49","modified_gmt":"2026-09-17T07:46:49","slug":"ege-universitesinden-uzay-bilimlerinde-ezber-bozacak-arastirma","status":"publish","type":"post","link":"https:\/\/egeajans.ege.edu.tr\/index.php\/2026\/09\/17\/ege-universitesinden-uzay-bilimlerinde-ezber-bozacak-arastirma\/","title":{"rendered":"Ege \u00dcniversitesinden uzay bilimlerinde ezber bozacak ara\u015ft\u0131rma"},"content":{"rendered":"

G\u00fcne\u015f\u2019in Kay\u0131p Gezegeni \u201cDev Dilek\u201d<\/p>\n

Ege \u00dcniversitesi Fen Fak\u00fcltesi \u00d6\u011fretim \u00dcyesi Prof. Dr. Mutlu Y\u0131ld\u0131z\u2019\u0131n y\u00fcr\u00fctt\u00fc\u011f\u00fc \u00e7al\u0131\u015fma, gen\u00e7 G\u00fcne\u015f\u2019in milyarlarca y\u0131l \u00f6nce s\u00fcper-d\u00fcnya k\u00fctlesinde bir gezegeni yutmu\u015f olabilece\u011fini ve bu devasa olay\u0131n izlerinin bug\u00fcn h\u00e2l\u00e2 G\u00fcne\u015f\u2019in i\u00e7 yap\u0131s\u0131nda \u00f6l\u00e7\u00fclebildi\u011fini ortaya koydu.<\/p>\n

Ege \u00dcniversitesi Fen Fak\u00fcltesi Astronomi ve Uzay Bilimleri B\u00f6l\u00fcm\u00fc \u00d6\u011fretim \u00dcyesi Prof. Dr. Mutlu Y\u0131ld\u0131z, G\u00fcne\u015f Sistemi\u2019nin ge\u00e7mi\u015fine \u0131\u015f\u0131k tutacak bir ara\u015ft\u0131rmaya imza att\u0131. D\u00fcnyan\u0131n en prestijli astronomi dergilerinden biri olan Monthly Notices of the Royal Astronomical Society (MNRAS) dergisinde yay\u0131mlanan \u00e7al\u0131\u015fma; gen\u00e7 G\u00fcne\u015f\u2019in, yakla\u015f\u0131k 5 ila 10 D\u00fcnya k\u00fctlesinde kayal\u0131k bir gezegeni yutmu\u015f olabilece\u011fini ve bu olay\u0131n parmak izlerinin bug\u00fcn G\u00fcne\u015f\u2019in derinliklerinde aranabilece\u011fini g\u00f6steriyor.<\/p>\n

\u00c7al\u0131\u015fmas\u0131yla ilgili bigli veren Prof. Dr. Mutlu Y\u0131ld\u0131z, \u201c\u00c7al\u0131\u015fman\u0131n \u00e7\u0131k\u0131\u015f noktas\u0131n\u0131, standart G\u00fcne\u015f modelleri ile hassas helyosismik g\u00f6zlemler aras\u0131nda uzun s\u00fcredir devam eden uyu\u015fmazl\u0131klar olu\u015fturuyor. \u00d6zellikle G\u00fcne\u015f\u2019in konvektif b\u00f6lgesinin alt\u0131ndaki ses h\u0131z\u0131 yap\u0131s\u0131 ve y\u00fczeyindeki belirgin lityum eksikli\u011fi, bilim insanlar\u0131 i\u00e7in b\u00fcy\u00fck bir soru i\u015faretiydi. Ara\u015ft\u0131rmam, D\u00fcnya\u2019dan birka\u00e7 kat daha b\u00fcy\u00fck bir gezegenin gen\u00e7 G\u00fcne\u015f\u2019e d\u00fc\u015fm\u00fc\u015f ve onun i\u00e7 yap\u0131s\u0131nda kal\u0131c\u0131 bir kimyasal iz b\u0131rakm\u0131\u015f olabilece\u011fini g\u00f6steriyor. G\u00fcne\u015f\u2019in evrimini modelleyerek elde etti\u011fim sonu\u00e7lar\u0131 i\u00e7 yap\u0131s\u0131na ili\u015fkin \u00e7ok hassas g\u00f6zlemlerle kar\u015f\u0131la\u015ft\u0131rd\u0131\u011f\u0131mda, gezegen yutulmas\u0131 senaryosunun standart G\u00fcne\u015f modelleri ile g\u00f6zlemler aras\u0131ndaki bilinen uyu\u015fmazl\u0131klar\u0131n \u00f6nemli bir b\u00f6l\u00fcm\u00fcn\u00fc a\u00e7\u0131klayabildi\u011fini buldum\u201d dedi.<\/p>\n

T\u00fcrk k\u00fclt\u00fcr\u00fcnden gelen isim: \u201cDev Dilek\u201d<\/strong><\/p>\n

Prof. Dr. Y\u0131ld\u0131z, MESA y\u0131ld\u0131z evrimi koduyla ger\u00e7ekle\u015ftirdi\u011fi sim\u00fclasyonlarda farkl\u0131 senaryolar\u0131 s\u0131nad\u0131. En ba\u015far\u0131l\u0131 sonu\u00e7lar\u0131 veren ve yakla\u015f\u0131k 5,6 D\u00fcnya k\u00fctlesindeki bir gezegene i\u015faret eden modele ise T\u00fcrk k\u00fclt\u00fcr\u00fcnden esinlenerek bir isim verildi. Gezegenin isimlendirilmesiyle ilgili konu\u015fan Prof. Dr. Y\u0131ld\u0131z, \u201cBu varsay\u0131msal gezegene \u2018Dev Dilek\u2019 ad\u0131n\u0131 verdim. \u2018Dev\u2019, gezegenin s\u00fcper-d\u00fcnya boyutlar\u0131na; \u2018Dilek\u2019 ise Merk\u00fcr\u2019\u00fcn eski T\u00fcrk k\u00fclt\u00fcr\u00fcndeki Tilek\/Dilek ad\u0131yla ili\u015fkisine g\u00f6nderme yap\u0131yor. Gezegenin kendisi art\u0131k var olmasa bile, modeller onun izlerinin G\u00fcne\u015f\u2019in i\u00e7inde milyarlarca y\u0131l boyunca korunmu\u015f olabilece\u011fini g\u00f6steriyor\u201d diye konu\u015ftu.<\/p>\n

Kozmik parmak izleri<\/strong><\/p>\n

Hesaplamalar\u0131n belirli bir k\u00fctle aral\u0131\u011f\u0131nda birle\u015fmesinin kendisi i\u00e7in de \u015fa\u015f\u0131rt\u0131c\u0131 oldu\u011funu vurgulayan Prof. Dr. Y\u0131ld\u0131z, \u201cAra\u015ft\u0131rma, sadece tek bir anomaliyi de\u011fil, G\u00fcne\u015f\u2019in ses h\u0131z\u0131 profilinden helyum bollu\u011funa kadar pek \u00e7ok farkl\u0131 \u00f6l\u00e7\u00fcm\u00fc ayn\u0131 anda a\u00e7\u0131klayabiliyor. DD1020 ad\u0131 verilen model, G\u00fcne\u015f\u2019in i\u00e7 yap\u0131s\u0131ndaki fiziksel ve kimyasal ko\u015fullar\u0131n gezegen k\u00f6kenli a\u011f\u0131r elementlerle nas\u0131l de\u011fi\u015fti\u011fini g\u00f6zler \u00f6n\u00fcne seriyor. Gezegen yutulmas\u0131n\u0131n G\u00fcne\u015f\u2019in i\u00e7 yap\u0131s\u0131n\u0131 etkileyebilece\u011fini d\u00fc\u015f\u00fcn\u00fcyordum; ancak hesaplar\u0131n b\u00f6ylesine belirli bir s\u00fcper-d\u00fcnya k\u00fctlesi aral\u0131\u011f\u0131nda birle\u015fmesini beklemiyordum. Bu, \u00e7al\u0131\u015fman\u0131n en ilgin\u00e7 sonu\u00e7lar\u0131ndan biri oldu\u201d dedi.<\/p>\n

Ara\u015ft\u0131rmada gezegenin G\u00fcne\u015f\u2019e girdikten sonraki fiziksel kaderini ele ald\u0131klar\u0131n\u0131 ifade eden Prof. Dr. Y\u0131ld\u0131z,\u00a0 \u201cBas\u0131n\u00e7 alt\u0131nda gezegen yap\u0131s\u0131, Roche kararl\u0131l\u0131\u011f\u0131, aerodinamik s\u00fcr\u00fcklenme ve ablasyon hesaplar\u0131; kompakt, kayal\u0131k bir s\u00fcper-D\u00fcnya\u2019n\u0131n G\u00fcne\u015f\u2019in konvektif zarf\u0131ndan ge\u00e7erken \u00e7ok az k\u00fctle kaybedebilece\u011fini ve konvektif b\u00f6lgenin taban\u0131na b\u00fcy\u00fck \u00f6l\u00e7\u00fcde b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc koruyarak ula\u015fabilece\u011fini g\u00f6steriyor. Modelde gezegen k\u00f6kenli a\u011f\u0131r element bak\u0131m\u0131ndan zengin madde konvektif b\u00f6lgenin alt\u0131nda yo\u011funla\u015f\u0131yor. Bu yerel zenginle\u015fme opasiteyi ve i\u00e7 tabakala\u015fmay\u0131 de\u011fi\u015ftiriyor. \u00dcstelik etki, standart G\u00fcne\u015f modellerinin helyosismik g\u00f6zlemlerle en belirgin uyu\u015fmazl\u0131klardan birini g\u00f6sterdi\u011fi b\u00f6lgede ortaya \u00e7\u0131k\u0131yor\u201d diye konu\u015ftu.<\/p>\n

Gelecek g\u00f6zlemler i\u00e7in g\u00fc\u00e7l\u00fc bir senaryo<\/strong><\/p>\n

Sonu\u00e7lar\u0131n kesin bir kan\u0131ttan ziyade, s\u0131nanabilir g\u00fc\u00e7l\u00fc bir senaryo oldu\u011funu belirten Prof. Dr. Y\u0131ld\u0131z, \u201cG\u00fcne\u015f\u2019in bir gezegeni yuttu\u011funu bug\u00fcn kesin olarak kan\u0131tlad\u0131\u011f\u0131m\u0131z\u0131 s\u00f6ylemek do\u011fru olmaz. Ancak modellerin \u00f6ng\u00f6rd\u00fc\u011f\u00fc yap\u0131sal ve kimyasal izler helyosismik veya ba\u015fka ba\u011f\u0131ms\u0131z g\u00f6zlemlerle do\u011frulanabilirse, milyarlarca y\u0131l \u00f6nce ger\u00e7ekle\u015fmi\u015f b\u00f6yle bir olay i\u00e7in \u00e7ok g\u00fc\u00e7l\u00fc kan\u0131t elde edilebilir. \u015eimdi s\u0131radaki temel soru, bu parmak izlerini ba\u011f\u0131ms\u0131z olarak tespit edip edemeyece\u011fimizdir\u201d dedi.<\/p>\n