Abstract
Work at ESO on the formation of dust from newly synthesized elements in the ejecta of SN 1987A began in late January when blue shifts of ≃ 600 km s-1 were found for various optical emission lines in spectra taken after September 1988. It was quickly realized that these shifts could be due to the attenuation of emission from the far, and therefore receding, side of the ejecta caused by dust within the ejecta. However, dust formation — if it occurred — was expected to be discovered photometrically through a precipitous fading in the UV and optical (DWEK [1], KOSAZA et al. [2]) with concomitant brightening in the IR. But no such fading had occurred and the brightening in the IR after day ≃ 450 (Smith et al. [3]) had been attributed to a thermal echo by pre-existing circumstellar dust, an interpretation apparently supported decisively by the measurement of a small, but finite angular size of ≃1.5 arcsec at 8-10µ (Roche et al. [4]).
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Lucy, L.B., Danziger, I.J., Gouiffes, C., Bouchet, P. (1991). Dust Condensation in the Ejecta of SN 1987A, II. In: Woosley, S.E. (eds) Supernovae. Santa Cruz Summer Workshops in Astronomy and Astrophysics. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-2988-9_8
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