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Title: INTERACTION BETWEEN THE BROAD-LINED TYPE Ic SUPERNOVA 2012ap AND CARRIERS OF DIFFUSE INTERSTELLAR BANDS

Diffuse interstellar bands (DIBs) are absorption features observed in optical and near-infrared spectra that are thought to be associated with carbon-rich polyatomic molecules in interstellar gas. However, because the central wavelengths of these bands do not correspond to electronic transitions of any known atomic or molecular species, their nature has remained uncertain since their discovery almost a century ago. Here we report on unusually strong DIBs in optical spectra of the broad-lined Type Ic supernova SN 2012ap that exhibit changes in equivalent width over short (≲ 30 days) timescales. The 4428 Å and 6283 Å DIB features get weaker with time, whereas the 5780 Å feature shows a marginal increase. These nonuniform changes suggest that the supernova is interacting with a nearby source of DIBs and that the DIB carriers possess high ionization potentials, such as small cations or charged fullerenes. We conclude that moderate-resolution spectra of supernovae with DIB absorptions obtained within weeks of outburst could reveal unique information about the mass-loss environment of their progenitor systems and provide new constraints on the properties of DIB carriers.
Authors:
; ; ; ; ; ; ; ;  [1] ;  [2] ; ;  [3] ;  [4] ;  [5] ; ; ;  [6] ;  [7] ;  [8] ;  [9] more »; « less
  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States)
  2. Yale Center for Astronomy and Astrophysics, Yale University, New Haven, CT 06520 (United States)
  3. Department of Physics and Astronomy, Dartmouth College, 6127 Wilder Lab, Hanover, NH 03755 (United States)
  4. Southern African Large Telescope, P.O. Box 9, Observatory 7935, Cape Town (South Africa)
  5. Astrophysics Science Division, NASA Goddard Space Flight Center, Mail Code 661, Greenbelt, MD 20771 (United States)
  6. University of Texas at Austin, 1 University Station C1400, Austin, TX 78712-0259 (United States)
  7. Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States)
  8. Astrophysics Research Institute, Liverpool John Moores University, Liverpool L3 5RF (United Kingdom)
  9. Department of Astronomy, Kyoto University Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502 (Japan)
Publication Date:
OSTI Identifier:
22364000
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 782; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; CATIONS; FULLERENES; INFRARED SPECTRA; LIMITING VALUES; MASS TRANSFER; MOLECULES; POTENTIALS; RESOLUTION; STELLAR WINDS; SUPERNOVAE