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Supernova (SN) 1987A is one of the best candidates to exploit thecapabilities of the freshly launched XRISM satellite. This celestial objectoffers the unique opportunity to study the evolution of a SN into a youngsupernova remnant. To date, the X-ray emission has been dominated by theshocked circumstellar medium (CSM), with no shocked ejecta firmly detected.However, recent studies provide compelling evidence that in the forthcomingyears the X-ray emission from SN 1987A will increasingly stem from the ejecta.Our aim is to assess the proficiency of XRISM-Resolve high resolutionspectrometer in pinpointing signatures of the shocked ejecta in SN 1987A.Taking advantage of a self consistent state-of-art magneto-hydrodynamicsimulation that describes the evolution from SN 1987A to its remnant, wesynthesized the XRISM-Resolve spectrum of SN 1987A, as it would be collected inthe allocated observation during the performance verification phase, which isforeseen for 2024. Our predictions clearly show the leading role of shockedejecta in shaping the profile of the emission lines. The Doppler broadeningassociated with the bulk motion along the line of sight of the rapidlyexpanding ejecta is shown to increase the line widths well above the valuesobserved so far. The quantitative comparison between our synthetic spectra andthe XRISM spectra will enable us to establish a strong connection between thebroadened line emission and the freshly shocked ejecta. This, in turn, willallow us to retrieve the ejecta dynamics and chemical composition from theX-ray emission.

Probing Shocked Ejecta in SN 1987A: A novel diagnostic approach using XRISM-Resolve