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Physical models of single and binary asteroids from photometric surveys: preparation of Gaia data scientific exploitation

Antonio Santana i Ros

Abstract

The subject of investigation was the reliability of the genetic algorithm which will be used to invert the photometric measurements of asteroids collected by the Gaia mission. To do that, several sets of simulations for 10,000 asteroids having different spin axis orientations, rotational periods and shapes were performed. The observational epochs used for each simulation were extracted from the Gaia mission simulator developed at the Observatoire de la Cote d'Azur, while the brightnesses were generated using a Z-buffer standard graphic method. The influence of contaminating the data set with Gaussian noise was also explored. The research revealed a correlation between the reliability of the inversion method and the asteroid's pole latitude. In particular, the results are biased against asteroids having quasi-spherical shapes and low pole latitudes. This effect is caused by the low lightcurve amplitude observed under such circumstances, as the periodic signal can be lost in the photometric random noise when both values are comparable. A second set of simulations was performed for synchronous binary asteroids. The analysis of the inversion results led to the confirmation that such systems can be successfully modeled with a simple triaxial ellipsoid body. On the basis of these simulations, it was also possible to develop strategies for binary asteroid detection.
Record ID
UAM21b1159f153c47ecaa26b737d7d9e7c2
Diploma type
Doctor of Philosophy
Author
Antonio Santana i Ros Antonio Santana i Ros,, Undefined Affiliation
Title in Polish
Modele fizyczne planetoid pojedynczych i podwójnych otrzymane na podstawie przeglądów fotometrycznych: przygotowanie do naukowego wykorzystania danych z kosmicznej misji Gaia
Title in English
Physical models of single and binary asteroids from photometric surveys: preparation of Gaia data scientific exploitation
Language
en English
Certifying Unit
Faculty of Physics (SNŚ/WyF/FoP)
Discipline
astronomy / (physical sciences domain) / (physical sciences)
Scientific discipline (2.0)
6.1 astronomy
Defense Date
13-01-2016
End date
13-01-2016
Supervisor
URL
http://hdl.handle.net/10593/14180 opening in a new tab
Keywords in English
asteroids, Gaia, photometry, inversion method
Abstract in English
The subject of investigation was the reliability of the genetic algorithm which will be used to invert the photometric measurements of asteroids collected by the Gaia mission. To do that, several sets of simulations for 10,000 asteroids having different spin axis orientations, rotational periods and shapes were performed. The observational epochs used for each simulation were extracted from the Gaia mission simulator developed at the Observatoire de la Cote d'Azur, while the brightnesses were generated using a Z-buffer standard graphic method. The influence of contaminating the data set with Gaussian noise was also explored. The research revealed a correlation between the reliability of the inversion method and the asteroid's pole latitude. In particular, the results are biased against asteroids having quasi-spherical shapes and low pole latitudes. This effect is caused by the low lightcurve amplitude observed under such circumstances, as the periodic signal can be lost in the photometric random noise when both values are comparable. A second set of simulations was performed for synchronous binary asteroids. The analysis of the inversion results led to the confirmation that such systems can be successfully modeled with a simple triaxial ellipsoid body. On the basis of these simulations, it was also possible to develop strategies for binary asteroid detection.
Thesis file

Uniform Resource Identifier
https://researchportal.amu.edu.pl/info/phd/UAM21b1159f153c47ecaa26b737d7d9e7c2/

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