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

Context: Supernova 1987A (SN1987A) exploded in the Large Magellanic Cloud(LMC). Its proximity and rapid evolution makes it a unique case study of theearly phases in the development of a supernova remnant. One particular aspectof interest is the possible formation of dust in SN1987A, as SNe couldcontribute significantly to the dust seen at high redshifts. Aims: We explorethe properties of SN1987A and its circumburst medium as seen at mm and sub-mmwavelengths, bridging the gap between extant radio and infrared (IR)observations of respectively the synchrotron and dust emission. Methods:SN1987A was observed with the Australia Telescope Compact Array (ATCA) at 3.2mm in July 2005, and with the Atacama Pathfinder EXperiment (APEX) at 0.87 mmin May 2007. We present the images and brightness measurements of SN1987A atthese wavelengths for the first time. Results: SN1987A is detected as anunresolved point source of 11.2 +/- 2.0 mJy at 3.2 mm (5" beam) and 21 +/- 4mJy at 0.87 mm (18" beam). These flux densities are in perfect agreement withextrapolations of the powerlaw radio spectrum and modified-blackbody dustemission, respectively. This places limits on the presence of free-freeemission, which is similar to the expected free-free emission from the ionizedejecta from SN1987A. Adjacent, fainter emission is observed at 0.87 mmextending ~0.5' towards the south-west. This could be the impact of thesupernova progenitor's wind when it was still a red supergiant upon a densemedium. Conclusions: We have established a continuous spectral energydistribution for the emission from SN1987A and its immediate surroundings,linking the IR and radio data. This places limits on the contribution fromionized plasma. Our sub-mm image reveals complexity in the distribution of colddust surrounding SN1987A, but leaves room for freshly synthesized dust in theSN ejecta.

The remnant of SN1987A revealed at (sub-)mm wavelengths