2012/11/30 by Hiroyuki Naito, H. Naito, A. Tajitsu +5 · 4 citations
Earth and Planetary Sciences · Physics and Astronomy · #Absorption (acoustics) #Absorption spectroscopy #Astro and Planetary Science #Astrophysics and Star Formation Studies #Ejecta #High-pressure geophysics and materials #Metastability #Photosphere #Spectral line #astro-ph.SR
paper · pdf · doi:10.1093/pasj/65.2.37
published in Publications of the Astronomical Society of Japan 65(2) (Oxford University Press) · 8 pages, 8 figures, accepted for publication in PASJ
arxiv created 2013/04/13 · openalex publication_date 2013/04/25 · arxiv updated 2015/06/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Abstract We report on the discovery of blue-shifted metastable He I* absorption lines at 3188 Å and 3889 Å with multiple components on high-resolution spectra ( R∼ 60000) of V1280 Scorpii. Similar multiple absorption lines associated with the Na I D doublet as well as Ca II H and K were observed. Na I D doublet absorption lines have been observed since 2009, while the metastable He I* absorption lines were absent in 2009, but were detected in 2011 (four years after the burst). We have found different time variations in the depths and velocities of blue-shifted absorption components among He I*, Na I, and Ca II. The complex time evolutions of these lines can be explained by assuming changes in the density and recombination/ionization rate when the ejecta expands and the photosphere contracts to become hotter. The multiple absorption lines originate in ejected materials consisting of clumpy components, which obscure a significant part of the continuum emitting region. We estimate the total mass of the ejected material to be on the order of ∼ 10 -4 M\odot , using metastable He I* λλ 3188 and 3889 absorption lines.