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Beyond dust survival: the inner regions of protoplanetary disks

Grant number: 12/20364-4
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): February 01, 2013
Effective date (End): January 31, 2018
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
Principal researcher:Alex Cavaliéri Carciofi
Grantee:Rodrigo Georgetti Vieira
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:11/51680-6 - Exploring the universe: from the galaxies formation to Earth-like planets with the Giant Magellan Telescope, AP.ESP


The issue of the inner regions of protoplanetary disks (< 1 AU) is a topic of a lot of debate in the scientific community. One of the reasons for this gap in our knowledge is the extreme difficulty to spatially resolve such inner structures. But also, the physics of these inner regions are still poorly understood, due to its complexity. The proximity to the star makes the temperature at these regions high enough (> 1500K) to modify and evaporate the dust grains. There is also evidence for the presence of a hot gas component inward the dust sublimation radius. Nevertheless, no self-consistent physical model could satisfactorily describe the actual distribution of dust and gas at the inner portion of the disks. Motivated by this puzzling scenario, we propose for this post-doctoral work to include the gas phase in the models of (dusty) protoplanetary disks. This can be done by modifying the successful example of decretion disks models of Be stars. The relative simpler case of dustless decretion disks of Be stars serves as ideal laboratories for studying the physics of the disk. The previous well established models of viscous Keplerian disks can be converted into protoplanetary disks by the modification of their boundary conditions. Non-isothermal effects must also be taken into account. For this purpose, it is mandatory to perform 3D-radiative transfer calculations. This will be possible by using Monte Carlo code HDUST (developed by the supervisor), which is to our knowledge the only numerical tool capable of handling both dust and gas in a self-consistent way. As a result, we expect to build a grid of models for a reliable volume in the parameter space. This will allow us not only to directly interpret already existing observations, but also to plan new interferometric observations with AMBER and MIDI (at VLTI) instruments.

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Scientific publications (9)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MENDIGUTIA, I.; DE WIT, W. J.; OUDMAIJER, R. D.; FAIRLAMB, J. R.; CARCIOFI, A. C.; ILEE, J. D.; VIEIRA, R. G.. High-resolution Br gamma spectro-interferometry of the transitional Herbig Ae/Be star HD 100546: a Keplerian gaseous disc inside the inner rim. Monthly Notices of the Royal Astronomical Society, v. 453, n. 2, p. 2126-2132, . (12/20364-4)
PANOGLOU, DESPINA; CARCIOFI, ALEX C.; VIEIRA, RODRIGO G.; CYR, ISABELLE H.; JONES, CAROL E.; OKAZAKI, ATSUO T.; RIVINIUS, THOMAS. Be discs in binary systems - I. Coplanar orbits. Monthly Notices of the Royal Astronomical Society, v. 461, n. 3, p. 2616-2629, . (09/54006-4, 15/17967-7, 12/20364-4, 13/16801-2)
RIMULO, L. R.; CARCIOFI, A. C.; VIEIRA, R. G.; RIVINIUS, TH.; FAES, D. M.; FIGUEIREDO, A. L.; BJORKMAN, J. E.; GEORGY, C.; GHOREYSHI, M. R.; SOSZYNSKI, I.. The life cycles of Be viscous decretion discs: fundamental disc parameters of 54 SMC Be stars. Monthly Notices of the Royal Astronomical Society, v. 476, n. 3, p. 3555-3579, . (16/16844-1, 09/54006-4, 12/20364-4, 12/21518-5, 15/17967-7)
KERBER, L. O.; NARDIELLO, D.; ORTOLANI, S.; BARBUY, B.; BICA, E.; CASSISI, S.; LIBRALATO, M.; VIEIRA, R. G.. Ages of the Bulge Globular Clusters NGC 6522 and NGC 6626 (M28) from HST Proper-motion-cleaned Color-Magnitude Diagrams. ASTROPHYSICAL JOURNAL, v. 853, n. 1, . (12/20364-4)
VIEIRA, R. G.; CARCIOFI, A. C.; BJORKMAN, J. E.; RIVINIUS, TH.; BAADE, D.; RIMULO, L. R.. The life cycles of Be viscous decretion discs: time-dependent modelling of infrared continuum observations. Monthly Notices of the Royal Astronomical Society, v. 464, n. 3, p. 3071-3089, . (09/54006-4, 15/17967-7, 12/20364-4)
VIEIRA, R. G.; CARCIOFI, A. C.; BJORKMAN, J. E.. The pseudo-photosphere model for the continuum emission of gaseous discs. Monthly Notices of the Royal Astronomical Society, v. 454, n. 2, p. 2107-2119, . (09/54006-4, 12/20364-4)
KLEMENT, R.; CARCIOFI, A. C.; RIVINIUS, TH.; PANOGLOU, D.; VIEIRA, R. G.; BJORKMAN, J. E.; STEFL, S.; TYCNER, C.; FAES, D. M.; KORCAKOVA, D.; et al. Multitechnique testing of the viscous decretion disk model I. The stable and tenuous disk of the late-type Be star beta CMi. Astronomy & Astrophysics, v. 584, . (10/19060-5, 09/54006-4, 12/20364-4, 13/16801-2)
KLEMENT, R.; CARCIOFI, A. C.; RIVINIUS, T.; MATTHEWS, L. D.; VIEIRA, R. G.; IGNACE, R.; BJORKMAN, J. E.; MOTA, B. C.; FAES, D. M.; BRATCHER, A. D.; et al. Revealing the structure of the outer disks of Be stars. Astronomy & Astrophysics, v. 601, . (09/54006-4, 16/16844-1, 15/17967-7, 12/20364-4)
GHOREYSHI, M. R.; CARCIOFI, A. C.; RIMULO, L. R.; VIEIRA, R. G.; FAES, D. M.; BAADE, D.; BJORKMAN, J. E.; OTERO, S.; RIVINIUS, TH.. The life cycles of Be viscous decretion discs: The case of omega CMa. Monthly Notices of the Royal Astronomical Society, v. 479, n. 2, p. 2214-2228, . (16/16844-1, 09/54006-4, 12/20364-4, 12/21518-5, 15/17967-7)

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