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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


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
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Greaves, J SSUPA, Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UKUNSPECIFIEDUNSPECIFIED
Scaife, A.M.M.Jodrell Bank Centre for Astrophysics, AlanTuring Building, Oxford Road, Manchester M13UNSPECIFIEDUNSPECIFIED
Frayer, D.T.National Radio Astronomy Observatory, PO Box 2, Green Bank, WV 24944, USA.UNSPECIFIEDUNSPECIFIED
Green, D.A.Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK.UNSPECIFIEDUNSPECIFIED
Mason, B.S.National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA.UNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Nature Astronomy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 662-667
Publisher:Nature Publishing Group
Keywords:​AME, proto-planetary discs, nano-diamonds
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Projekt COROT Beteiligung (old)
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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