Probing Shocked Ejecta in SN 1987A with XRISM-Resolve: the effects of the gate valve closed

TL;DR

This study assesses XRISM-Resolve's ability to analyze shocked ejecta in SN 1987A despite the gate valve malfunction, demonstrating that ejecta signatures can still be identified through spectral line profiles.

Contribution

It provides an updated diagnostic approach for analyzing SN 1987A's ejecta with XRISM-Resolve when the gate valve remains closed, a scenario not previously considered.

Findings

Ejecta signatures remain detectable despite the closed gate valve.

Line profile analysis can identify shocked ejecta under reduced instrument capabilities.

The study confirms XRISM-Resolve's robustness in supernova ejecta diagnostics.

Abstract

Supernova (SN) 1987A is widely regarded as an excellent candidate for leveraging the capabilities of the freshly launched XRISM satellite. Recent researches indicate that the X-ray emission from SN 1987A will increasingly originate from its ejecta in the years to come. In a previous study, we thoroughly examined the proficiency of XRISM-Resolve in identifying signatures of shocked ejecta in SN 1987A, synthesizing the XRISM-Resolve spectrum based on a state-of-the-art magneto-hydrodynamic simulation. However, following the satellite's launch, a technical issue arose with the XRISM instrument's gate valve, which failed to open, thereby affecting observations with the Resolve spectrometer. Here, we update our analysis, reevaluating our diagnostic approach under the assumption that the gate valve remains closed. We find that, even with the reduced instrumental capabilities, it will be possible to pinpoint the ejecta contribution through the study of the line profiles in the XRISM-Resolve spectrum of SN 1987A.