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Disintegrating planets are ultra-short-period exoplanets that appear to havea comet-like dust tail. They are commonly interpreted as low-mass planets whosesolid surface is evaporating and whose tail is made of recondensing minerals.Transmission spectroscopy of the dust tails could thus allow us to directlyprobe the elementary compositions of the planets. Previous work alreadyinvestigated the feasibility of such observations using the JWST mid-infraredinstrument. In this study, we explore if one can obtain a strong constrain onthe tail composition by adding spectroscopy at longer wavelengths using SPICAmid-infrared instrument. We use a simple model for the spatial distribution ofthe dust tails and produce their synthetic transmission spectra assumingvarious dust compositions. We find that combined infrared spectra from JWST andSPICA will allow us to diagnose various components of the dust tails. JWST willbe able to detect silicate and carbide absorption features with afeature-to-noise ratio of $\gtrsim$ 3 in the tail transmission spectrum of adisintegrating planet located within 100 pc from the Earth with a transit depthdeeper than 0.5%. SPICA can distinguish between Fe- and Mg-bearing crystallinesilicates for planets at $\lesssim$ 100 pc with a transit depth of $\gtrsim$2%. Transit searches with current and future space telescopes (e.g., $TESS$ andPLATO) will provide ideal targets for such spectroscopic observations.

Constraining the Bulk Composition of Disintegrating Exoplanets Using Combined Transmission Spectra from JWST and SPICA