English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Optical spectroscopy of the Type Ia supernova SN 2002ic obtained on 2003 June27.6 UT, i.e., about 222 rest-frame days after explosion, is presented. StrongH emission indicates an interaction between the expanding SN ejecta and anH-rich circumstellar medium (CSM). The spectrum of SN 2002ic resembles those ofSNe 1997cy and 1999E. The three SNe also have similar luminosities, suggestingthat they are the same phenomenon and that the CSM is also similar. We proposea new classification, Type IIa SNe, for these events. The observed lineprofiles and line ratios are measured and discussed within the ejecta-CSMinteraction scenario. The emission in H Balmer, [O III], and He I lines, and inpermitted Fe II blends, resembles the spectra of the Type IIn SN 1987F and ofSeyfert 1 galaxies. A high-density, clumpy CSM is inferred. Strong, very broad[Ca II]/Ca II and [O I]/O I missions imply that not all the outer SN ejectawere decelerated in the interaction, suggesting that the CSM is aspherical.Comment: 13 pages including 4 figures, aastex preprint style. Minor changes.  Accepted by ApJ

Subaru Spectroscopy of the Interacting Type Ia Supernova SN 2002ic: Evidence of a Hydrogen-rich, Asymmetric Circumstellar Medium