We have performed self-consistent, three-dimensional, continuum radiative transfer modeling in the disk of HD 100546. Following observations and previous work, the model includes gaps in the disk. The model also includes variations in dust size, composition, and distribution. A best fit model is achieved over a wide wavelength range from 2 - 1000 mm. While we generally confirm the results of previous models, we find evidence for dust settling and shattering in the outer disk. We also find evidence for dust segregation in the inner disk, and inferential evidence for an irregular and tenuous inner region ~1 AU, which may be due to early disruption of the disk. Such settling is an important process in planet formation. The location of the settling in the outer disk, and the existence of segregation and irregularity in the interior, suggest that the race between disruption, settling, and planet formation is on-going in HD 100546, and that the timescales for the various processes vary throughout the disk at a given epoch.
References
[1]
Benisty, M., Tatulli, E., Ménard, F. and Swain, M.R. (2010) The Complex Structure of the Disk around HD 100546: The Inner Few Astronomical Units. AstronomyandAstrophysics, 511, A75. https://doi.org/10.1051/0004-6361/200913590
[2]
Sissa, E. (2018) High-Contrast Study of the Candidate Planets and Protoplanetary Disk around HD 100546. AstronomyandAstrophysics, 619, A160.
[3]
Sloan, G.C., Kraemer, K.E., Price, S.D. and Shipman, R.F. (2003) A Uniform Database of 2.4–45.4 Micron Spectra from the infraredSpaceObservatory Short Wavelength Spectrometer. TheAstrophysicalJournalSupplementSeries, 147, 379-401. https://doi.org/10.1086/375443
[4]
Gry, C., Swinyard, B., Harwood, A., Trams, N., Leeks, S., Lim, T., et al. (2003) The ISO Handbook. European Space Agency.
[5]
Herschel Science Center (2018) The SPIRE Handbook: Herschel Explanatory Supplement, Volume IV. European Space Agency. https://www.cosmos.esa.int/web/herschel/legacy-documentation-spire
[6]
Pineda, J.E., Szulágyi, J., Quanz, S.P., van Dishoeck, E.F., Garufi, A., Meru, F., et al. (2019) High-Resolution ALMA Observations of HD 100546: Asymmetric Circumstellar Ring and Circumplanetary Disk Upper Limits. The Astrophysical Journal, 871, 48. https://doi.org/10.3847/1538-4357/aaf389
[7]
Fedele, D., Toci, C., Maud, L. and Lodato, G. (2021) ALMA 870 μm Continuum Observations of HD 100546: Evidence of a Giant Planet on a Wide Orbit. Astronomy & Astrophysics, 651, A90. https://doi.org/10.1051/0004-6361/202141278
[8]
Casassus, S., Cárcamo, M., Hales, A., Weber, P. and Dent, B. (2022) The Doppler Flip in HD 100546 as a Disk Eruption: The Elephant in the Room of Kinematic Protoplanet Searches. The Astrophysical Journal Letters, 933, L4. https://doi.org/10.3847/2041-8213/ac75e8
[9]
Dullemond, C.P., Jhuasz, A., Pohl, A., Sershti, F., Shetty, R., Peters, T., Commercon, B. and Flock, M. (2012) Astrophysics Source Code Library. Astrophysics Source Code Library.
[10]
Mendigutía, I., Oudmaijer, R.D., Garufi, A., Lumsden, S.L., Huélamo, N., Cheetham, A., et al. (2017) The Protoplanetary System HD 100546 in Hαpolarized Light from Sphere/Zimpol: A Bar-Like Structure across the Di Astronomy&Astrophysics, 608, A104. https://doi.org/10.1051/0004-6361/201731131
[11]
Dorschner, J., Begemann, B., Henning, T., Jaeger, C. and Mutschke, H. (1995) Steps toward Interstellar Silicate Minerology. II. Study of Mg-Fe-Silicate Glasses of Variable Composition. AstronomyandAstrophysics, 300, Article 503.
[12]
Ossenkopf, V. and Henning, T.H. (1994) Dust Opacities for Protostellar Cores. AstronomyandAstrophysics, 291, Article 943.
[13]
Bruderer, S., van Dishoeck, E.F., Doty, S.D. and Herczeg, G.J. (2012) The Warm Gas Atmosphere of the HD 100546 Disk Seen by Herschel: Evidence of a Gas-Rich, Carbon-Poor Atmosphere? Astronomy & Astrophysics, 541, A91. https://doi.org/10.1051/0004-6361/201118218
[14]
Chiang, E.I. and Goldreich, P. (1997) Spectral Energy Distributions of T Tauri Stars with Passive Circumstellar Disks. The Astrophysical Journal, 490, 368-376. https://doi.org/10.1086/304869
[15]
Pantin, E., Waelkens, C. and Lagage, P.O. (2000) ADONIS Observations of the HD 100546 Circumstellar Dust Disk. AstronomyandAstrophysics, 361, L9.
[16]
Panić, O., van Dishoeck, E.F., Hogerheijde, M.R., Belloche, A., Güsten, R., Boland, W., et al. (2010) Observations of Warm Molecular Gas and Kinematics in the Disc around HD 100546. Astronomy and Astrophysics, 519, A110. https://doi.org/10.1051/0004-6361/200913709
[17]
Blum, J. (2010) Dust Growth in Protoplanetary Disks—A Comprehensive Experimental/Theoretical Approach. Research in Astronomy and Astrophysics, 10, 1199-1214. https://doi.org/10.1088/1674-4527/10/12/002
[18]
Savvidou, S., Bitsch, B. and Lambrechts, M. (2020) Influence of Grain Growth on the Thermal Structure of Protoplanetary Discs. Astronomy & Astrophysics, 640, A63. https://doi.org/10.1051/0004-6361/201936576
