Optical Spectroscopy of the Somewhat Peculiar Type IIb Supernova 2001ig

Silverman, JM; Mazzali, P; Chornock, R; Filippenko, AV; Clocchiatti, A.; PHILLIPS, MM; Ganeshalingam, M; Foley, RJ

Abstract

Here we present previously unpublished optical spectra of supernova (SN) 2001ig, a Type IIb SN, from about a week after explosion until nearly one year later. The earliest spectrum consists of only a few broad absorption features, but soon more common Type II SN features including hydrogen P Cygni profiles and helium absorption become apparent. At later times, as the H features fade and the He I absorption becomes more prominent, we observe the SN to transition from a Type II to a Type Ib. Finally, observations after 250 days past explosion show a nebular-phase SN spectrum with one of the largest magnesium to oxygen intensity ratios ever seen. Additionally, we present models of the late-time spectra which indicate that the inner ejecta consist of ~1:15 M? of material, most of which (by mass) is in the form of oxygen, with ~0:13 M? of 56Ni and essentially no hydrogen. © 2009. The Astronomical Society of the Pacific.

Más información

Título según WOS: Optical Spectroscopy of the Somewhat Peculiar Type IIb Supernova 2001ig
Título según SCOPUS: Optical spectroscopy of the somewhat peculiar type IIb supernova 2001ig
Título de la Revista: PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
Volumen: 121
Número: 881
Editorial: UNIV CHICAGO PRESS
Fecha de publicación: 2009
Página de inicio: 689
Página final: 698
Idioma: English
Notas: ISI, SCOPUS