Νέα στοιχεία στο φως τον πιο «ακραίο πλανήτη»

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Η θέση αλλά και τα φαινόμενα που προκαλούνται σε ένα από τους περίπου έξι χιλιάδες εξωπλανήτες που έχουν εντοπιστεί μέχρι σήμερα οδήγησαν τους επιστήμονες στο να τον χαρακτηρίσουν «ακραίο πλανήτη». Νέα στοιχεία που ανακαλύφθηκαν σε αυτόν επιβεβαιώνουν τον χαρακτηρισμό που του δόθηκε. Ο πλανήτης αυτός βρίσκεται στο σύστημα του άστρου WASP 18 σε απόσταση 325 ετών φωτός από εμάς στον αστερισμό του Φοίνικα και έχει λίγο μεγαλύτερη μάζα από αυτή του Ήλιου.

O Wasp-18b όπως ονομάστηκε ο εξωπλανήτης είναι ένας γίγαντας αερίων με μάζα δέκα φορές μεγαλύτερη από αυτή του Δία και βρίσκεται σε απόσταση αναπνοής από το μητρικό του άστρο, μόλις 3 εκατ. χλμ μακριά από αυτό. Ο πλανήτης Wasp 18b είναι τόσο κοντά στο άστρο που ολοκληρώνει μια πλήρη περιστροφή γύρω από αυτό μόλις σε 24 ώρες! Μάλιστα κατά την τροχιακή του κίνηση ο πλανήτης πλησιάζει το άστρο σε απόσταση μικρότερη του ενός εκατομμυρίου χιλιομέτρων και με δεδομένο το μέγεθος του θα μπορούσε να πει κάποιος ότι σχεδόν το ακουμπάει!

Ομάδα ερευνητών του Κέντρου Διαστημικών Πτήσεων Goddard της NASA εντόπισαν νέα στοιχεία στον Wasp-18b Και ειδικότερα μια σειρά από ατμοσφαιρικά δεδομένα. Σύμφωνα με τους ερευνητές ο πλανήτης περιβάλλεται από μια «πνιγηρή» στρατόσφαιρα στην οποία κυριαρχεί το τοξικό μονοξείδιο του άνθρακα ενώ απουσιάζει εντελώς οποιοδήποτε ίχνος νερού.

«Η ατμοσφαιρική σύσταση του Wasp-18b ξεπερνάει όλα όσα γνωρίζαμε για τους πλανήτες αλλά και όσα αναμέναμε να δούμε ακόμη και σε αυτόν. Δεν υπάρχει κανένας άλλος πλανήτης που τα ανώτερα στρώματα της ατμόσφαιρας του να κυριαρχούνται σε τόσο υψηλά ποσοστά από μονοξείδιο του άνθρακα» αναφέρουν στην μελέτη τους οι ερευνητές επιβεβαιώνοντας δικαιώνοντας έτσι τον χαρακτηρισμό του ακραίου πλανήτη που έχει δοθεί στον Wasp-18b. Οι αστρονόμοι θα συνεχίσουν να παρατηρούν και τα επόμενα χρόνια τον συγκεκριμένο πλανήτη για να μάθουν όσο το δυνατόν περισσότερα για αυτόν.

Πηγή:tovima.gr

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