Indications of Rapid Dust Formation in the Inner Region of a Protoplanetary Disk
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2026
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| author | Thanathibodee, Thanawuth Espaillat, Catherine Calvet, Nuria Zhu, Zhaohuan Nammanee, Julalak Pittman, Caeley Volz, Maire |
| author_facet | Thanathibodee, Thanawuth Espaillat, Catherine Calvet, Nuria Zhu, Zhaohuan Nammanee, Julalak Pittman, Caeley Volz, Maire |
| contents | We report a significant increase in mid-infrared emission $\leq10$ $μ$m in a transitional disk. The 2024 JWST/MIRI observation of the disk around CVSO 1942 reveals flux increase by a factor of two at $λ\leq10$ $μ$m, compared to the near photospheric flux level observed with Spitzer/IRS in 2005. No significant change in flux at $\gtrsim15$ $μ$m is detected in the spectra. Comparing the MIRI/MRS spectrum and NEOWISE photometry, we found that this $\leq10$ $μ$m flux increase occurs on a timescale of 2 weeks and is consistent with the presence of warm (1,400 K), optically thick, large ($\gtrsim1$ $μ$m) dust grains near the dust sublimation radius. We propose that this rapid dust appearance may indicate in situ dust formation, possibly from planetesimal collisions in the inner disk. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_08973 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Indications of Rapid Dust Formation in the Inner Region of a Protoplanetary Disk Thanathibodee, Thanawuth Espaillat, Catherine Calvet, Nuria Zhu, Zhaohuan Nammanee, Julalak Pittman, Caeley Volz, Maire Earth and Planetary Astrophysics Solar and Stellar Astrophysics We report a significant increase in mid-infrared emission $\leq10$ $μ$m in a transitional disk. The 2024 JWST/MIRI observation of the disk around CVSO 1942 reveals flux increase by a factor of two at $λ\leq10$ $μ$m, compared to the near photospheric flux level observed with Spitzer/IRS in 2005. No significant change in flux at $\gtrsim15$ $μ$m is detected in the spectra. Comparing the MIRI/MRS spectrum and NEOWISE photometry, we found that this $\leq10$ $μ$m flux increase occurs on a timescale of 2 weeks and is consistent with the presence of warm (1,400 K), optically thick, large ($\gtrsim1$ $μ$m) dust grains near the dust sublimation radius. We propose that this rapid dust appearance may indicate in situ dust formation, possibly from planetesimal collisions in the inner disk. |
| title | Indications of Rapid Dust Formation in the Inner Region of a Protoplanetary Disk |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2602.08973 |