| Abstract : | Protoplanetary disks surrounding pre-main-sequence stars are the birthplaces of planetary systems. Multi-wavelength observations of the material (gas and dust) in these disks provide important constraints on the mass distribution, dynamical state, physical conditions, and evolution of these disks, thus helping us understand the planet formation process in greater detail. Mid-infrared spectra, in particular, provide insights into the physics and chemistry of the inner disk, the terrestrial planet-forming region. This work focuses on the detailed investigation of 20 protoplanetary disks surrounding T Tauri stars, using publicly available data from the James Webb Space Telescope (JWST) MIRI Medium Resolution Spectrometer (program ids: 1584, 1640, 1282). We have independently and uniformly reduced the data using the latest JWST pipeline and extracted the spectra from the stage 3 data cubes. We find the disk spectra are diverse in nature and extremely rich in gas lines. We have identified various molecular transitions like CO2, H2O, C2H2, HCN, OH, and CO in these protoplanetary disks. Many of the observed lines are detected for the first time with JWST. Assuming LTE conditions, we have uniformly modeled these molecular lines to obtain the column density, emitting area, and temperature of the emitting region, thus constraining the physical conditions in terrestrial planet-forming regions in protoplanetary disks. We will discuss how the physical conditions of the disks derived from the JWST spectra depend on the host star properties and the disk morphology revealed by ALMA observations.
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