Spitzer-IRS Archives

MRS continuum-subtracted spectra of C2H2 (magenta), HCN (green), H2O (blue), and CO2 (brown) emission lines between 13.6-15.3 µm from JDISCS sources with sub-mm dust sizes r > 63 au. ALMA images are shown to the right of the spectra (Andrews et al. 2018; Long et al. 2018, 2019a, Long et al. 2025, in prep), in order of sub-mm dust disk size from largest (top left; Elias 27, r ∼ 250 au) to smallest (bottom right; RU Lup, r ∼ 63 au). Slab model fits to the molecular emission lines are overplotted on the spectra, corresponding to the best-fit parameters and upper limits reported in Tables 5, 6, 7, and A1. 13C 12CH2 emission is also detected in the spectrum of GO Tau, along with multiple CO2 isotopologues in MY Lup (Salyk et al. 2025), and an OH-rich spectrum with no CO2 emission from GM Aur (Romero-Mirza et al., submitted). -- astro-ph.SR

Astrochemistry, Astrogeology, Astronomy & Telescopes, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Interstellar, Status Report

The JDISC Survey: Linking the Physics and Chemistry of Inner and Outer Protoplanetary Disk Zones

by Keith CowingMay 13, 2025May 13, 2025

MIRI spectra of select targets from the JDISCS sample, representing broad categories of sources, namely: intermediate mass, transition disk (with a large dust cavity), solar-mass with weak water emission, solar-mass […]

Spitzer-IRS

The JDISC Survey: Linking the Physics and Chemistry of Inner and Outer Protoplanetary Disk Zones

Underwater Oxygen Loss Threatens Earth’s Stability, Researchers Warn

Fire And Ice: Were Yellowstone’s Past Volcanic Eruptions And Glaciations Related?

Substrate-Agnostic 3x: Biosignatures, Technosignatures, Ecologies

Planet-moon Ejections In Close Stellar Encounters

First Study Hints Solar Storms May Alter The Weather During Martian Dust Storms