2026ApJ...999L..31T

Query : 2026ApJ...999L..31T

2026ApJ...999L..31T - Astrophys. J., 999, L31 (2026/March-2)

Indications of Rapid Dust Formation in the Inner Region of a Protoplanetary Disk.

THANATHIBODEE T., ESPAILLAT C., CALVET N., ZHU Z., NAMMANEE J., PITTMAN C. and VOLZ M.

Abstract (from CDS):

We report a significant increase in mid-infrared emission ≤10 μm in a transitional disk. The 2024 JWST/MIRI observation of the disk around CVSO 1942 reveals flux increase by a factor of 2 at λ ≤10 μm, compared to the near-photospheric flux level observed with Spitzer's Infrared Spectrograph (IRS) in 2005. No significant change in flux at ≳15 μm is detected in the spectra. Comparing the MIRI/MRS spectrum and NEOWISE photometry, we found that this ≤10 μm flux increase occurs on a timescale of 2 weeks and is consistent with the presence of warm (1400 K), optically thick, large (≳1 μm) 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.

Abstract Copyright: © 2026. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Protoplanetary disks - T Tauri stars - Dust continuum emission - Stellar accretion disks

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* UX Tau A TT* 04 30 03.9932216088 +18 13 49.469925504   12.92 11.15     K2Ve 386 0
2 NAME Ori I As* 05 38 -02.8           ~ 653 0
3 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1498 0
4 2MASS J05454194-0012053 TT* 05 45 41.9508842448 -00 12 05.424975396           K5.5 28 0
5 V* T Cha Or* 11 57 13.5245085552 -79 21 31.530508884   10.00 11.86     K0e 304 1

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