Evolving into a remnant: optical observations of SN 1978K at three decades
Author
dc.contributor.author
Kuncarayakti, Hanindyo
Author
dc.contributor.author
Maeda, Keiichi
Author
dc.contributor.author
Anderson, J. P.
Author
dc.contributor.author
Hamuy Wackenhut, Mario
Author
dc.contributor.author
Nomoto, K.
Author
dc.contributor.author
Galbany, Lluis
Author
dc.contributor.author
Doi, M.
Admission date
dc.date.accessioned
2016-10-17T18:25:37Z
Available date
dc.date.available
2016-10-17T18:25:37Z
Publication date
dc.date.issued
2016
Cita de ítem
dc.identifier.citation
MNRAS 458, 2063–2073 (2016)
es_ES
Identifier
dc.identifier.other
10.1093/mnras/stw430
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/140800
Abstract
dc.description.abstract
We present new optical observations of the supernova SN 1978K, obtained in 2007 and 2014 with the Very Large Telescope. We discover that the supernova has not faded significantly, even more than three decades after its explosion. The spectrum exhibits numerous narrow (FWHM a parts per thousand(2)600 km s(-1)) emission lines, indicating that the supernova blastwave is persistently interacting with dense circumstellar material (CSM). Evolution of emission lines indicates that the supernova ejecta is slowly progressing through the reverse shock, and has not expanded past the outer edge of the circumstellar envelope. We demonstrate that the CSM is not likely to be spherically distributed, with mass of a parts per thousand(2)1 M-aS (TM). The progenitor mass loss rate is estimated as a parts per thousand(3)0.01 M-aS (TM) yr(-1). The slowly fading late-time light curve and spectra show striking similarity with SN 1987A, indicating that a rate at which the CSM is being swept-up by the blastwave is gradually decaying and SN 1978K is undergoing similar evolution to become a remnant. Due to its proximity (4 Mpc), SN 1978K serves as the next best example of late-time supernova evolution after SN 1987A.
es_ES
Patrocinador
dc.description.sponsorship
Ministry of Economy, Development, and Tourism's Millennium Science Initiative
IC120009
CONICYT through FONDECYT
3140563
3140566
Japan Society for the Promotion of Science (JSPS) KAKENHI
26800100
World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
JSPS
JSPS, Japan
23224004
26400222