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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

Grant number: 16/23054-7
Support Opportunities:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): September 01, 2017
Effective date (End): August 15, 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
Supervisor: Peter Woitke
Host Institution: Instituto de Pesquisa e Desenvolvimento (IP&D). Universidade do Vale do Paraíba (UNIVAP). São José dos Campos , SP, Brazil
Research place: University of St Andrews, Scotland  
Associated to the scholarship:15/10492-3 - 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, BP.PD


Protoplanetary disks host simple and complex molecules in the gas phase and in the condensed state, from which new planets are formed. The formation and survival of these molecules is affected by the temperature and the UV and X-ray radiation field in the disk. To address these questions, laboratory and theoretical efforts are essential to determine where molecular species are destroyed or formed in the protoplanetary disks, and on what timescale. In this project the state-of-art thermo-chemical disk code ProDiMo will be employed to investigate the formation and survival of complex molecules due to surface chemistry. The code is able to solve the dust continuum and line radiative transfer, the balance of heating & cooling rates, as well as the kinetic chemical evolution of the gas and solid phases using reaction rates from the UMIST and other databases. New experimental data, such as photodissociation cross section and dust & ice complex refractive indexes, will be implemented into ProDiMo code to simulate, in a more realistic approximation, the destruction and formation of complex molecules in the vicinity of young stars. These laboratory data have been obtained from previous FAPESP's projects (JP 2009/18304-0, DR 2013/07657-5, PD 2015/10492-3). Specifically, we will model the chemistry in T Tauri discs in this project, including UV and X-ray photo-processes in the ice phase, and compare the results to astronomical observations, as for example TW Hya.

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Scientific publications
(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)
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.; WOITKE, P.; PILLING, S.; THI, W. -F.; JORGENSEN, J. K.; KRISTENSEN, L. E.; PEROTTI, G.; KAMP, I.. Simulation of CH3OH ice UV photolysis under laboratory conditions. Astronomy & Astrophysics, v. 673, p. 38-pg., . (16/23054-7)

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