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We report new mid-infrared observations of the remarkable object IRAS15099-5856 using the space telescopes AKARI and Spitzer, which demonstrate thepresence of prominent crystalline silicate emission in this bright source. IRAS15099-5856 has a complex morphology with a bright central compact source (IRS1)surrounded by knots, spurs, and several extended (~4') arc-like filaments. Thesource is seen only at >= 10 um. The Spitzer MIR spectrum of IRS1 showsprominent emission features from Mg-rich crystalline silicates, strong [Ne II]12.81 um and several other faint ionic lines. We model the MIR spectrum asthermal emission from dust and compare with the Herbig Be star HD 100546 andthe luminous blue variable R71, which show very similar MIR spectra. Molecularline observations reveal two molecular clouds around the source, but noassociated dense molecular cores. We suggest that IRS1 is heated by UVradiation from the adjacent O star Muzzio 10 and that its crystalline silicatesmost likely originated in a mass outflow from the progenitor of the supernovaremnant (SNR) MSH 15-52. IRS1, which is embedded in the SNR, could have beenshielded from the SN blast wave if the progenitor was in a close binary systemwith Muzzio 10. If MSH15-52 is a remnant of Type Ib/c supernova (SN Ib/c), ashas been previously proposed, this would confirm the binary model for SN Ib/c.IRS1 and the associated structures may be the relics of massive star death, asshaped by the supernova explosion, the pulsar wind and the intense ionizingradiation of the embedded O star.

IRAS 15099-5856: Remarkable Mid-Infrared Source with Prominent Crystalline Silicate Emission Embedded in the Supernova Remnant MSH15-52