Table 5
Comparative table of Delorme 1 b’s disk and disks around more massive objects observed with MIRI/MRS.
| Properties | Delorme 1 AB b | J0438 | J0446B | Typical | Typical |
|---|---|---|---|---|---|
| Host type | Exoplanet | Brown dwarf | VLMS | T Tauri | VLMS/BD |
| Age (Myrs) | 30 | ~0.6 | 34 | 1-10 | 1-10 |
| Spectral Type | L0 | M7.25 | M4.5 | K0-M5 | M4.5-M9 |
| Distance (pc) | 47.2 | 140.3 | 82 | – | – |
| M* (M⊙) | 0.013 | 0.05 | 0.18 | ~0.2-2 | ~0.02-0.2 |
| L* (L⊙) | 0.0003 | 0.002 | 0.016 | ~0.01-0.2 | ~0.1-0.002 |
| Ṁ (M⊙/yr) | 0.2-5×10−11 a | 1.58×10−11 | 2.5×10−11 | 10−7-10−9 | 10−9-10−12 |
| Lacc/L* | 1-37% | 4% | 2.5% | 1-100% | 0.1-10% |
| Molecular emission | |||||
| H2O | – | ✓ | ✓ b | ✓ | ✓ b |
| CO2 | – | ✓ | ✓ | ✓ | ✓ |
| OH | – | – | – | ✓ | – |
| HCN | ✓ | ✓ | ✓ | ✓ | ✓ |
| CH4 | – | – | ✓ | – | ✓ |
| CH3 | – | – | ✓ | – | ✓ |
| C2H2 | ✓ | ✓ | ✓ | ✓ | ✓ |
| 13CCH2 | ✓ | – | ✓ | – | ✓ |
| C2H4 | – | – | ✓ | – | ✓ |
| C3H4 | – | – | ✓ | – | ✓ |
| C4H2 | – | – | ✓ | – | ✓ |
| C6H6 | – | – | ✓ | – | ✓ |
| C2H6 | – | – | ✓ | – | ✓ |
| HC3n | – | – | ✓ | – | ✓ |
| H2 | ✓ | ✓ | ✓ | ✓ | ✓ |
| References | This work | 1 | 2 | 3, 4 | 4, 5 |
Notes. aValues based on stellar and planetary scaling from Betti et al. (2022). bMarginal or weak detections. References. (1) Long et al. (2025), (2) Perotti et al. (2025), (3) Pascucci et al. (2023) for the typical values, (4) Grant et al. (2025); Arabhavi et al. (2025a) for the molecules detected in averaged MIR spectra, (5) Typical VLMS and BD properties comes from the sample describe in Arabhavi et al. (2025a), and references therein. These targets are selected for their similar properties, such as accretion rate, detected molecules, and age (e.g., J0446B), or for their proximity in mass (e.g., J0438), along with averaged values of T Tauri stars and VLMS observed at MIR (Grant et al. 2025; Arabhavi et al. 2025a).
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