The unusual protoplanetary disk around the T Tauri star ET Cha
P. Woitke, B. Riaz, G. Duchene, I. Pascucci, A.-Ran Lyo, W. R. F., Dent, N. Phillips, W.-F. Thi, F. Menard, G. J. Herczeg, E. Bergin, A. Brown,, A. Mora, I. Kamp, G. Aresu, S. Brittain, I. de Gregorio-Monsalvo, G. Sandell

TL;DR
This study combines multi-wavelength observations and advanced modeling to characterize the unusual, very compact protoplanetary disk around the 6-8 million-year-old T Tauri star ET Cha, revealing its low mass and potential rapid evolution.
Contribution
It provides a detailed analysis of ET Cha's protoplanetary disk using new observational data and modeling, highlighting its small size, low mass, and possible rapid dispersal compared to typical disks.
Findings
Disk extends from 0.022 to 10 AU
Disk dust mass is (2-5) x 10^-8 Msun
Disk gas mass is poorly constrained, (5 x 10^-5 to 3 x 10^-3) Msun
Abstract
We present new continuum and line observations, along with modelling, of the faint (6-8) Myr old T Tauri star ET Cha belonging to the eta Chamaeleontis cluster. We have acquired HERSCHEL/PACS photometric fluxes at 70 mic and 160 mic, as well as a detection of the [OI] 63 mic fine-structure line in emission, and derived upper limits for some other far-IR OI, CII, CO and o-H2O lines. The HERSCHEL data is complemented by new ANDICAM B-K photometry, new HST/COS and HST/STIS UV-observations, a non-detection of CO J=3-2 with APEX, re-analysis of a UCLES high-resolution optical spectrum showing forbidden emission lines like [OI] 6300A, [SII] 6731A and 6716A, and [NII] 6583A, and a compilation of existing broad-band photometric data. We used the thermo-chemical disk code ProDiMo and the Monte-Carlo radiative transfer code MCFOST to model the protoplanetary disk around ET Cha. Based on these…
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