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The JDISC Survey: Inner Disk Chemistry of Class I/FS Disks and Tentative Evidence for Early Pebble Drift

  • Authors: Ke Zhang, Andrea Banzatti, Colette Salyk, Abygail Waggoner, Klaus Pontoppidan, María José Colmenares, Ilaria Pascucci, Lucas A. Cieza, Miguel Vioque, Paola Pinilla, Geoffrey A. Blake, Joan Najita, Joe Williams, Sebastiaan Krijt, Till Kaeufer, Jane Huang, Feng Long, Chengyan Xie, Minjae Kim, Eshan Raul, Dary A. Ruíz-Rodríguez, Nicole Arulanantham, Benoît Tabone, Mayank Narang, Karina Mauco

Ke Zhang et al 2026 The Astronomical Journal 172 .

  • Provider: AAS Journals

Caption: Figure 7.

Comparison of slab model parameters between Class I/FS (i < 70∘; blue) and Class II (gray) disks. Top panel: excitation temperatures for the three water components (hot, warm, cold), HCN, C2H2, and CO2. Bottom panel: log emitting masses for the same species. Individual sources are shown as points; violin plots show the kernel density estimate of each distribution, and horizontal bars mark the median. Upper limits are indicated by red downward-pointing arrows. The three water components have comparable temperatures in both classes, while the median temperature of CO2 is colder in Class I/FS (329 vs. 482 K) with 1.5σ separation.

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