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  Four annular structures in a protostellar disk less than 500,000 years old

Segura-Cox, D. M., Schmiedeke, A., Pineda, J. E., Stephens, I. W., Fernández-López, M., Looney, L. W., et al. (2020). Four annular structures in a protostellar disk less than 500,000 years old. Nature, 586(7828), 228-231. doi:10.1038/s41586-020-2779-6.

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Segura-Cox, Dominique M.1, Author              
Schmiedeke, Anika1, Author              
Pineda, Jaime E., Author
Stephens, Ian W., Author
Fernández-López, Manuel, Author
Looney, Leslie W., Author
Caselli, Paola1, Author              
Li, Zhi-Yun, Author
Mundy, Lee G., Author
Kwon, Woojin, Author
Harris, Robert J., Author
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1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 Abstract: Annular structures (rings and gaps) in disks around pre-main-sequence stars have been detected in abundance towards class II protostellar objects that are approximately 1,000,000 years old1. These structures are often interpreted as evidence of planet formation, with planetary-mass bodies carving rings and gaps in the disk. This implies that planet formation may already be underway in even younger disks in the class I phase, when the protostar is still embedded in a larger-scale dense envelope of gas and dust. Only within the past decade have detailed properties of disks in the earliest star-forming phases been observed. Here we report 1.3-millimetre dust emission observations with a resolution of five astronomical units that show four annular substructures in the disk of the young (less than 500,000 years old) protostar IRS 63. IRS 63 is a single class I source located in the nearby Ophiuchus molecular cloud at a distance of 144 parsecs, and is one of the brightest class I protostars at millimetre wavelengths. IRS 63 also has a relatively large disk compared to other young disks (greater than 50 astronomical units). Multiple annular substructures observed towards disks at young ages can act as an early foothold for dust-grain growth, which is a prerequisite of planet formation. Whether or not planets already exist in the disk of IRS 63, it is clear that the planet-formation process begins in the initial protostellar phases, earlier than predicted by current planet-formation theories.

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Language(s): eng - English
 Dates: 2020-10-07
 Publication Status: Published online
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 Identifiers: DOI: 10.1038/s41586-020-2779-6
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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 586 (7828) Sequence Number: - Start / End Page: 228 - 231 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238