The Destruction of the Circumstellar Ring of Sn 1987a
Author
Fransson, Claes
Larsson, Josefin
Migotto, Katia
Pesce, Dominic
Challis, Peter
Chevalier, Roger A.
France, Kevin
Kirshner, Robert P.
Leibundgut, Bruno
Lundqvist, Peter
McCray, Richard
Spyromilio, Jason
Taddia, Francesco
Jerkstrand, Anders
Mattila, Seppo
Smith, Nathan
Sollerman, Jesper
Wheeler, J. Craig
Crotts, Arlin
Garnavich, Peter
Heng, Kevin
Lawrence, Stephen S.
Panagia, Nino
Pun, Chun S. J.
Sonneborn, George
Sugerman, Ben
Published Version
https://doi.org/10.1088/2041-8205/806/1/L19Metadata
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Fransson, Claes, Josefin Larsson, Katia Migotto, Dominic Pesce, Peter Challis, Roger A. Chevalier, Kevin France, et al. 2015. “THE DESTRUCTION OF THE CIRCUMSTELLAR RING OF SN 1987A.” The Astrophysical Journal 806 (1): L19. https://doi.org/10.1088/2041-8205/806/1/l19.Abstract
We present imaging and spectroscopic observations with Hubble Space Telescope and Very Large Telescope of the ring of SN 1987A from 1994 to 2014. After an almost exponential increase of the shocked emission from the hotspots up to day similar to 8000 (similar to 2009), both this and the unshocked emission are now fading. From the radial positions of the hotspots we see an acceleration of these up to 500-1000 km s(-1), consistent with the highest spectroscopic shock velocities from the radiative shocks. In the most recent observations (2013 and 2014), we find several new hotspots outside the inner ring, excited by either X-rays from the shocks or by direct shock interaction. All of these observations indicate that the interaction with the supernova ejecta is now gradually dissolving the hotspots. We predict, based on the observed decay, that the inner ring will be destroyed by similar to 2025.Terms of Use
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