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Study about the chemical evolution of astrophysical ices in the vicinity of young stellar objects employing experimental data in the infrared and computational modeling codes

Grant number: 15/10492-3
Support Opportunities:Scholarships in Brazil - Post-Doctoral
Effective date (Start): September 01, 2015
Effective date (End): September 30, 2018
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Astrophysics of the Interstellar Medium
Principal Investigator:Sergio Pilling Guapyassu de Oliveira
Grantee:Will Robson Monteiro Rocha
Host Institution: Instituto de Pesquisa e Desenvolvimento (IP&D). Universidade do Vale do Paraíba (UNIVAP). São José dos Campos , SP, Brazil
Associated research grant:09/18304-0 - Synthesis and degradation of prebiotic molecular species at planetary atmospheres, comets and interstellar ice analogs, AP.JP
Associated scholarship(s):16/23054-7 - Formation of complex molecules on astrophysical ices in star forming regions triggered by UV and X-rays by employing the ProDiMo code and laboratory data, BE.EP.PD


It has been shown through observations in the infrared from ISO (Infrared Space Observatory) and SST (Spitzer Space Telescope), the existence of astrophysical ices toward protostars. Among them, there are H2O, CO, CO2, NH3, CH3OH, CH4, HCOOH, H2CO, CH3CHO. In the same time of observations, several papers were published, showing the formation of complex molecules from simple one, through energetic processing with photons and particles, mimicking the typical scenario in the star-forming regions.Here we will employ data of astrophysical ices obtained from laboratory in the infrared into computational models (RADMC-3D, ProDiMo), that calculates radiative transfer in attempt to better simulate the astrophysical environments around young stellar objects in a more realistic approach. The experimental data will be measured, in principle, at two laboratories: LASA Lab. at Univap (UV, soft X-rays and electrons) and Ganil Lab. at France (energetic ions). By using this methodology, we will simulate the physical observers from telescopes in the infrared, such as spectra and images. Such study allow us calculate the complex refractive indces of several molecules, as well as understand the influence of radiation under the band strength, which is fundamental parameter to estimate the abundances of molecules in the solid phase. Additionally, will be investigated if the complex molecules itself is a product of the stellar radiation field, given the scenario of class I and T-Tauri objects, instead the chemical processing of the ices in the primitive cloud.

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Scientific publications (11)
(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)
VASCONCELOS, FREDSON DE A.; PILLING, SERGIO; ROCHA, WILL R. M.; ROTHARD, HERMANN; BODUCH, PHILIPPE. Energetic Processing of N-2:CH4 Ices Employing X-Rays and Swift Ions: Implications for Icy Bodies in the Outer Solar System. ASTROPHYSICAL JOURNAL, v. 850, n. 2, . (15/10492-3, 09/18304-0, 13/07657-5)
ROCHA, W. R. M.; PILLING, S.. Tracking the Evolutionary Stage of Protostars through the Abundances of Astrophysical Ices. ASTROPHYSICAL JOURNAL, v. 896, n. 1, . (15/10492-3, 16/22018-7, 16/23054-7)
ROCHA, W. R. M.; PILLING, S.. The role of external far-ultraviolet irradiation in the survival of astrophysical ices in Elias 29. Monthly Notices of the Royal Astronomical Society, v. 478, n. 4, p. 5190-5198, . (15/10492-3)
ROCHA, W. R. M.; PILLING, S.; DE BARROS, A. L. F.; ANDRADE, D. P. P.; ROTHARD, H.; BODUCH, P.. Infrared complex refractive index of astrophysical ices exposed to cosmic rays simulated in the laboratory. Monthly Notices of the Royal Astronomical Society, v. 464, n. 1, p. 754-767, . (13/07657-5, 09/18304-0, 15/10492-3)
CARVALHO, G. A.; PILLING, S.. X-ray photolysis of CH3COCH3 ice: implications for the radiation effects of compact objects towards astrophysical ices. Monthly Notices of the Royal Astronomical Society, v. 498, n. 1, p. 689-701, . (13/07657-5, 09/18304-0, 15/10492-3)
PILLING, S.; ROCHA, W. R. M.; FREITAS, F. M.; DA SILVA, P. A.. Photochemistry and desorption induced by X-rays in water rich astrophysical ice analogs: implications for the moon Enceladus and other frozen space environments. RSC ADVANCES, v. 9, n. 49, p. 28823-28840, . (15/10492-3, 09/18304-0, 13/07657-5)
VASCONCELOS, F. A.; PILLING, S.; ROCHA, W. R. M.; ROTHARD, H.; BODUCH, P.; DING, J. J.. Ion irradiation of pure and amorphous CH4 ice relevant for astrophysical environments. Physical Chemistry Chemical Physics, v. 19, n. 20, p. 12845-12856, . (13/07657-5, 09/18304-0, 15/10492-3)
CARVALHO, G. A.; PILLING, S.. Photolysis of CH3CN Ices by Soft X-rays: Implications for the Chemistry of Astrophysical Ices at the Surroundings of X-ray Sources. Journal of Physical Chemistry A, v. 124, n. 41, p. 8574-8584, . (13/07657-5, 09/18304-0, 15/10492-3)
VASCONCELOS, F. A.; PILLING, S.; ROCHA, W. R. M.; ROTHARD, H.; BODUCH, P.. Radiolysis of N-2-rich astrophysical ice by swift oxygen ions: implication for space weathering of outer solar system bodies. Physical Chemistry Chemical Physics, v. 19, n. 35, p. 24154-24165, . (13/07657-5, 09/18304-0, 15/10492-3)

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