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

After nearly two decades at least five emission mechanisms can be found in SN1987A. The ejecta continue to glow as a result of the radioactive decay oflong-lived nuclei (mostly 44Ti), but is fading continuously because of theexpansion and the reduced opacity. The nearly stationary rings around SN 1987Aare still fluorescing from the recombination of matter originally excited bythe soft X-ray emission from the shock breakout at explosion. The supernovashock reached the inner circumstellar ring about ten years ago and the forwardshock is moving through the inner ring and leaves shocked material behind. Thismaterial is excited and accelerated. The reverse shock illuminates thefast-moving supernova ejecta as it catches up. And, finally light echoes innearby interstellar matter can still be observed. We present here highresolution spectroscopy in the optical and integral-field spectroscopy in thenear infrared of SN 1987A and its rings.Comment: 8 pages, 6 figures, to be published in The Multicoloured Landscape of  Compact Objects and their Explosive Origins, Proceedings of the Cefalu  conferenc

SN 1987A at the end of its second decade