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Study of neon novae using data cubes and 3D photoionization modeling

Grant number: 14/10326-3
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): September 01, 2014
Effective date (End): July 31, 2018
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Marcos Perez Diaz
Grantee:Larissa Takeda
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil


The project consists in the study of neon novae and in the development of photoionization modeling tools. The "neon novae" are peculiar novae, with overabundance of neon due to the presence of a rare ONeMg white dwarf. These novae represent less than 10% of the total observed novae population. The current identification of neon novae is subject to large errors of calculation and modeling, which induce errors of up to 1 dex in the neon abundance estimates. Neither the characteristics of the ONeMg white dwarfs, and their evolution, are well known in the scenario of high mass white dwarfs formation in binary systems. The properties of novae with ONeMg white dwarfs are directly related to the evolution of the binary system and to the detonation conditions near the Chandrasekhar limit. The first stage of the project consists in the observation of spatially resolved envelopes of these novae with IFU spectroscopy, which will provide data cubes with information of the spatial distribution of luminosity in different spectral lines. The observations will be performed with the VIMOS instrument (ESO-VLT), and/or with GMOS (Gemini). A second stage of the project will consist in the development of codes to execute the deprojection of the intensity distributions of the observed data, in order to accomplish a 3D mapping. The resultant structure will be modeled using the RAINY3D photoionization code to provide detailed information about the shell. Therefore, it will be possible to determine with accuracy the abundances, ejected mass in the eruption and the properties of the envelopes, characterizing the class of neon novae in the sense of nucleosynthesis and of its role on the binaries evolution. (AU)

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)
TAKEDA, LARISSA; DIAZ, MARCOS. Imaging and Analysis of Neon Nova V382 Vel Shell. Publications of the Astronomical Society of the Pacific, v. 131, n. 999 MAY 2019. Web of Science Citations: 0.
DIAZ, MARCOS P.; ABRAHAM, ZULEMA; RIBEIRO, VALERIO A. R. M.; BEAKLINI, PEDRO P. B.; TAKEDA, LARISSA. The structure of a recent nova shell as observed by ALMA. Monthly Notices of the Royal Astronomical Society, v. 480, n. 1, p. L54-L57, OCT 2018. Web of Science Citations: 2.
TAKEDA, L.; DIAZ, M.; CAMPBELL, R.; LYKE, J. 3D photoionization models of nova V723 Cas. Monthly Notices of the Royal Astronomical Society, v. 473, n. 1, p. 355-365, JAN 2018. Web of Science Citations: 3.

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