The matter beyond the ring: the recent evolution of SN 1987A observed by the Hubble Space Telescope

TL;DR

Recent Hubble observations of SN 1987A reveal the evolving supernova remnant, showing brightness changes in ejecta and ring structures, expansion velocities, and new emission spots outside the ring, offering insights into the remnant's dynamics and progenitor history.

Contribution

This study provides detailed imaging of SN 1987A's evolution, including brightness trends, expansion measurements, and the discovery of new emission features outside the ring, enhancing understanding of supernova remnant development.

Findings

Inner ejecta brightening is slowing down.

Western side of ejecta is brighter since ~7000 days.

New faint emission spots outside the ring have appeared.

Abstract

The nearby SN 1987A offers a spatially resolved view of the evolution of a young supernova remnant. Here we precent recent Hubble Space Telescope imaging observations of SN 1987A, which we use to study the evolution of the ejecta, the circumstellar equatorial ring (ER) and the increasing emission from material outside the ER. We find that the inner ejecta have been brightening at a gradually slower rate and that the western side has been brighter than the eastern side since ~7000 days. This is expected given that the X-rays from the ER are most likely powering the ejecta emission. At the same time the optical emission from the ER continues to fade linearly with time. The ER is expanding at 680\pm 50 km/s, which reflects the typical velocity of transmitted shocks in the dense hotspots. A dozen spots and a rim of diffuse H-alpha emission have appeared outside the ER since 9500 days. The new spots are more than an order of magnitude fainter than the spots in the ER and also fade faster. We show that the spots and diffuse emission outside the ER may be explained by fast ejecta interacting with high-latitude material that extends from the ER toward the outer rings. Further observations of this emission will make it possible to determine the detailed geometry of the high-latitude material and provide insight into the formation of the rings and the mass-loss history of the progenitor.