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Astron. Astrophys. 347, 500-507 (1999)

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ISO SWS/LWS observations of SN 1987A *

P. Lundqvist 1, J. Sollerman 1, C. Kozma 1, B. Larsson 1, J. Spyromilio 2, A.P.S. Crotts 3, J. Danziger 4 and D. Kunze 5

1 Stockholm Observatory, S-133 36 Saltsjöbaden, Sweden
2 European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany
3 Columbia University, Department of Astronomy, 538 W. 120th Street, New York, USA
4 Osservatorio Astronomico, Via G.B. Tiepolo 11, I-34131 Trieste, Italy
5 Max-Planck-Institut für Extraterrestrische Physik, Postfach 1603, D-85740 Garching, Germany

Received 3 February 1999 / Accepted 14 April 1999

Abstract

We report on observations of SN 1987A with ISO SWS/LWS made [FORMULA] years after the explosion. No emission from the supernova was seen. In particular, the upper limits on the fluxes of [Fe I] 24.05 [FORMULA] and [Fe II] 25.99 [FORMULA] on day 3 999 are [FORMULA] Jy and [FORMULA] Jy, respectively. Assuming a homogeneous distribution of 44Ti inside [FORMULA], we have made theoretical models to estimate the mass of ejected 44Ti. Assessing various uncertainties of the model, we obtain an upper limit of [FORMULA]. The implications of this are discussed.

The LWS data display continuum emission as well as nebular lines of [O I], [C II] and [O III] from neighboring photoexcited regions in the LMC. The [O III] lines indicate an electron density of [FORMULA] cm-3, and the continuum can be explained by dust with a temperature of [FORMULA] K. A second dust component with [FORMULA] K may also be present.

Key words: stars: supernovae: individual: SN 1987A – nuclear reactions, nucleosynthesis, abundances – stars: supernovae: general

* ISO is an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA.

Correspondence to: peter@astro.su.se

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© European Southern Observatory (ESO) 1999

Online publication: June 30, 1999
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