An Astronomical 2175 Å Feature in Interplanetary Dust Particles

  title={An Astronomical 2175 Å Feature in Interplanetary Dust Particles},
  author={John P. Bradley and Zu Rong Dai and Rolf Erni and Nigel D. Browning and Giles A. Graham and Peter K. Weber and J B Smith and Ian Douglass Hutcheon and Hope A. Ishii and Sa{\vs}a Bajt and Christine Floss and Frank J. Stadermann and Scott A. Sandford},
  pages={244 - 247}
The 2175 angstrom extinction feature is the strongest (visible-ultraviolet) spectral signature of dust in the interstellar medium. Forty years after its discovery, the origin of the feature and the nature of the carrier(s) remain controversial. Using a transmission electron microscope, we detected a 5.7–electron volt (2175 angstrom) feature in interstellar grains embedded within interplanetary dust particles (IDPs). The carriers are organic carbon and amorphous silicates that are abundant in… 
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