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Anomalous microwave emission from spinning nanodiamonds around stars

Greaves, J S and Scaife, A.M.M. and Frayer, D.T. and Green, D.A. and Mason, B.S. and Smith, A. M. S. (2017) Anomalous microwave emission from spinning nanodiamonds around stars. Nature Astronomy, 2, pp. 662-667. Nature Publishing Group. DOI: 10.1038/s41550-018-0495-z ISSN 2397-3366

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Official URL: https://www.nature.com/articles/s41550-018-0495-z

Abstract

Several interstellar environments produce anomalous microwave emission (AME), with brightness peaks at tens-of-gigahertz frequencies. The emission’s origins are uncertain; rapidly spinning nanoparticles could emit electric-dipole radiation, but the polycyclic aromatic hydrocarbons that have been proposed as the carrier are now found not to correlate with Galactic AME signals. The difficulty is in identifying co-spatial sources over long lines of sight. Here, we identify AME in three protoplanetary disks. These are the only known systems that host hydrogenated nanodiamonds, in contrast with the very common detection of polycyclic aromatic hydrocarbons. Using spectroscopy, the nanodiamonds are located close to the host stars, at physically well-constrained temperatures. Developing disk models8, we reproduce the emission with diamonds 0.75–1.1 nm in radius, holding ≤1–2% of the carbon budget. Ratios of microwave emission to stellar luminosity are approximately constant, allowing nanodiamonds to be ubiquitous, but emitting below the detection threshold in many star systems. This result is compatible with the findings of similar-sized diamonds within Solar System meteorites. As nanodiamond spectral absorption is seen in interstellar sightlines, these particles are also a candidate for generating galaxy-scale AME.

Item URL in elib:https://elib.dlr.de/123811/
Document Type:Article
Title:Anomalous microwave emission from spinning nanodiamonds around stars
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Greaves, J SSUPA, Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UKUNSPECIFIED
Scaife, A.M.M.Jodrell Bank Centre for Astrophysics, AlanTuring Building, Oxford Road, Manchester M13UNSPECIFIED
Frayer, D.T.National Radio Astronomy Observatory, PO Box 2, Green Bank, WV 24944, USA.UNSPECIFIED
Green, D.A.Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK.UNSPECIFIED
Mason, B.S.National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA.UNSPECIFIED
Smith, A. M. S.alexis.smith (at) dlr.deUNSPECIFIED
Date:2017
Journal or Publication Title:Nature Astronomy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:2
DOI :10.1038/s41550-018-0495-z
Page Range:pp. 662-667
Publisher:Nature Publishing Group
ISSN:2397-3366
Status:Published
Keywords:​AME, proto-planetary discs, nano-diamonds
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt COROT Beteiligung
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Schubert, Renate
Deposited On:28 Nov 2018 10:25
Last Modified:28 Nov 2018 10:25

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