ΠεριγραφήSpring Cleaning in an Infant Star System.jpg
English: This image depicts the dusty disc encircling the young, isolated star HD 169142. The Atacama Large Millimeter/submillimeter Array (ALMA) imaged this disc in high resolution by picking up faint signals from its constituent millimetre-sized dust grains. The vivid rings are thick bands of dust, separated by deep gaps.
Optimised to study the cold gas and dust of systems like HD 169142, ALMA’s sharp eyes have revealed the structure of many infant solar systems with similar cavities and gaps. A variety of theories have been proposed to explain them — such as turbulence caused by magnetorotational instability, or the fusing of dust grains — but the most plausible explanation is that these pronounced gaps were carved out by giant protoplanets.
When solar systems form gas and dust coalesce into planets. These planets then effectively spring clean their orbits, clearing them of gas and dust and herding the remaining material into well-defined bands. The deep gaps seen in this image are consistent with the presence of multiple protoplanets — a finding that agrees with other optical and infrared studies of the same system.
Observing such dusty protoplanetary discs with ALMA allows scientists to investigate the first steps of planet formation in a bid to unveil the evolutionary paths of these infant systems.
This media was created by the European Southern Observatory (ESO). Their website states: "Unless specifically noted, the images, videos, and music distributed on the public ESO website, along with the texts of press releases, announcements, pictures of the week, blog posts and captions, are licensed under a Creative Commons Attribution 4.0 International License, and may on a non-exclusive basis be reproduced without fee provided the credit is clear and visible." To the uploader: You must provide a link (URL) to the original file and the authorship information if available.
να μοιραστείτε – να αντιγράψετε, διανέμετε και να μεταδώσετε το έργο
να διασκευάσετε – να τροποποιήσετε το έργο
Υπό τις ακόλουθες προϋποθέσεις:
αναφορά προέλευσης – Θα πρέπει να κάνετε κατάλληλη αναφορά, να παρέχετε σύνδεσμο για την άδεια και να επισημάνετε εάν έγιναν αλλαγές. Μπορείτε να το κάνετε με οποιοδήποτε αιτιολογήσιμο λόγο, χωρίς όμως να εννοείται με οποιονδήποτε τρόπο ότι εγκρίνουν εσάς ή τη χρήση του έργου από εσάς.
https://creativecommons.org/licenses/by/4.0CC BY 4.0 Creative Commons Attribution 4.0 truetrue
Αυτό το αρχείο περιέχει πρόσθετες πληροφορίες, πιθανόν από την ψηφιακή φωτογραφική μηχανή ή το scanner που χρησιμοποιήθηκε για την δημιουργία ή την ψηφιοποίησή της. Αν το αρχείο έχει τροποποιηθεί από την αρχική του κατάσταση, ορισμένες λεπτομέρειες πιθανόν να μην αντιστοιχούν πλήρως στην τροποποιημένη εικόνα.
Αναφορά/Πάροχος
ALMA (ESO/NAOJ/NRAO)/ Fedele et al.
Πηγή
European Southern Observatory
Συνοπτικός τίτλος
Spring Cleaning in an Infant Star System
Τίτλος εικόνας
This image depicts the dusty disc encircling the young, isolated star HD 169142. The Atacama Large Millimeter/submillimeter Array (ALMA) imaged this disc in high resolution by picking up faint signals from its constituent millimetre-sized dust grains. The vivid rings are thick bands of dust, separated by deep gaps. Optimised to study the cold gas and dust of systems like HD 169142, ALMA’s sharp eyes have revealed the structure of many infant solar systems with similar cavities and gaps. A variety of theories have been proposed to explain them — such as turbulence caused by magnetorotational instability, or the fusing of dust grains — but the most plausible explanation is that these pronounced gaps were carved out by giant protoplanets. When solar systems form gas and dust coalesce into planets. These planets then effectively spring clean their orbits, clearing them of gas and dust and herding the remaining material into well-defined bands. The deep gaps seen in this image are consistent with the presence of multiple protoplanets — a finding that agrees with other optical and infrared studies of the same system. Observing such dusty protoplanetary discs with ALMA allows scientists to investigate the first steps of planet formation in a bid to unveil the evolutionary paths of these infant systems. Links INAF press release (Italian)
Όροι χρήσης
Creative Commons Attribution 4.0 International License
Ημερομηνία και ώρα της παραγωγής ψηφιακών δεδομένων
06:00, 3 Απριλίου 2017
Λογισμικό που χρησιμοποιήθηκε
The ESA/ESO/NASA FITS Liberator
Ημερομηνία και ώρα τελευταίας επεξεργασίας αρχείου
15:36, 10 Μαρτίου 2017
Ημερομηνία και ώρα της μετατροπής σε ψηφιακή μορφή
15:59, 10 Μαρτίου 2017
Η ημερομηνία μετα-δεδομένων τροποποιήθηκε τελευταία