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Chandra Observes the End of an Era SN 1987A

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arxiv 1608.02160 v1 pith:T6SQSFSL submitted 2016-08-06 astro-ph.HE

Kari A. Frank , Svetozar A. Zhekov , Sangwook Park , Richard McCray , Eli Dwek , David N. Burrows This is my paper · ORCID
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Updated imaging and photometric results from Chandra observations of SN 1987A, covering the last 16 years, are presented. We find that the 0.5-2 keV light curve has remained constant at ~8x10^-12 erg s^-1 cm^-2 since 9500 days, with the 3-8 keV light curve continuing to increase until at least 10000 days. The expansion rate of the ring is found to be energy dependent, such that after day 6000 the ring expands faster in the 2-10 keV band than it does at energies <2 keV. Images show a reversal of the east-west asymmetry between 7000 and 8000 days after the explosion. The latest images suggest the southeastern side of the equatorial ring is beginning to fade. Consistent with the latest optical and infrared results, our Chandra analysis indicates the blast wave is now leaving the dense equatorial ring, which marks the beginning of a major change in the evolutionary phase of the supernova remnant 1987A.

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Cited by 2 Pith papers

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  1. HCO$^+$ and the Effect of Mixing in SN 1987A

    astro-ph.SR 2026-07 conditional novelty 6.0 of 10

    In SN 1987A's inner ejecta, HCO+ is co-spatial with CO, and its two-line RADEX mass of 3–9×10^-6 solar masses implies hydrogen was mixed into the carbon-oxygen zones.

  2. Chandra X-Ray Imaging and Spatially Resolved Spectroscopy of SN 1987A: Energy-Dependent Morphology of the Equatorial Ring

    astro-ph.HE 2026-07 accept novelty 6.0 of 10

    Soft X-ray emission from SN 1987A's equatorial ring becomes broader and extends inward after ~2012, while hard X-rays remain compact, indicating growing contribution from reverse-shock-heated interior material.

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