Finalized Bachelor theses

Número de entradas: 14

Is there a planet around Alpha Centauri B?

Estado: defended (05/07/2016)
Estudiante: Baroch, David
Supervisada por: Juan Carlos Morales Peralta
Universidad: Universitat Autònoma de Barcelona

In this work we analyze the HARPS radial velocities of Alpha Centauri B in order to investigate the origin of the signal found by Dumusque et al. (2012) attributed to an Earth-like exoplanet. We have made use of several time series analysis techniques to get the periodograms of the available data, and…
Estado: defended (05/07/2016)
Estudiante: Baroch, David
Supervisada por: Juan Carlos Morales Peralta
Universidad: Universitat Autònoma de Barcelona

In this work we analyze the HARPS radial velocities of Alpha Centauri B in order to investigate the origin of the signal found by Dumusque et al. (2012) attributed to an Earth-like exoplanet. We have made use of several time series analysis techniques to get the periodograms of the available data, and study the significancy of the different frequencies present. Realistic simulations of the data with and without the planetary signal have also been used to verify the impact of leakage due to the spectral window of the observations. After this thorough study and the compilation of all available bibliography about this system, we conclude that more observations are needed to confirm the true nature of the system. Current data indicates that the signal attributed to an exoplanet is likely due to spectral window leakage and the difficulties in the treatment of the stellar activity.

Mobile application for diffusion and outreach of astronomical and space missions

Estado: defended (10/02/2016)
Estudiante: Joaquim Calvo Gubianas
Supervisada por: Lluís Gesa Boté
Universidad: Universitat Autònoma de Barcelona

This article presents the development of an app for Android devices in response to the needs/following the needs of the IEEC to present its projects and other useful information. Its content is nicely organized and it explains the analysis, the approaches and the methodology used to find and implement…
Estado: defended (10/02/2016)
Estudiante: Joaquim Calvo Gubianas
Supervisada por: Lluís Gesa Boté
Universidad: Universitat Autònoma de Barcelona

This article presents the development of an app for Android devices in response to the needs/following the needs of the IEEC to present its projects and other useful information. Its content is nicely organized and it explains the analysis, the approaches and the methodology used to find and implement a solution to this problem, it is implemented using a client-server paradigm and it is explained by the definition, logical and structural, of the components that form it. Finally, possible variations in the implementation and the final conclusions are presented.

Development of a control software for the project Gravitational Wave Low Frequency Technologies test-bed of l'IEEC/ICE

Estado: defended (10/02/2016)
Estudiante: Segura Tirado, Víctor
Supervisada por: Lluís Gesa Boté
Universidad: Universitat Autònoma de Barcelona

Gravitational waves are ripples of space-time produced by movement of massive bodies accelerated, were predicted by Albert Einstein in 1916, as result of his theory of general relativity. Because the interaction of these type of gravitational waves is of low intensity, they are difficult to detect. Gravitational Wave Low Frequency Technologies test-bed (GRLOW) project, wich belongs to scientific projects of Institut d'Estudis Espacials de Catalunya and Institut de Ciències de l'Espai (IEEC/ICE), investigates technologically the second generation detectors of gravitational waves. This software engineering project is about how to perform analysis, design and prototype software control for GRLOW project to perform experimentation of testing laboratory.
Gravitational waves are ripples of space-time produced by movement of massive bodies accelerated, were predicted by Albert Einstein in 1916, as result of his theory of general relativity. Because the interaction of these type of gravitational waves is of low intensity, they are difficult to detect. Gravitational…
Estado: defended (10/02/2016)
Estudiante: Segura Tirado, Víctor
Supervisada por: Lluís Gesa Boté
Universidad: Universitat Autònoma de Barcelona

Gravitational waves are ripples of space-time produced by movement of massive bodies accelerated, were predicted by Albert Einstein in 1916, as result of his theory of general relativity. Because the interaction of these type of gravitational waves is of low intensity, they are difficult to detect. Gravitational Wave Low Frequency Technologies test-bed (GRLOW) project, wich belongs to scientific projects of Institut d'Estudis Espacials de Catalunya and Institut de Ciències de l'Espai (IEEC/ICE), investigates technologically the second generation detectors of gravitational waves. This software engineering project is about how to perform analysis, design and prototype software control for GRLOW project to perform experimentation of testing laboratory.

Conveccion termihalina aplicada al problema de la abundancia solar

Estado: defended (16/09/2013)
Estudiante: Protasio, Cristina
Supervisada por: Aldo Serenelli
Universidad: Universitat Autònoma de Barcelona

El interior de las estrellas es un medio fuertemente estratificado cuya estructura est ́a determinada, en gran medida, por los gradientes de temperatura y composici ́on qu ́ımica presentes. Sin embargo, es pr ́actica comu ́n en modelos de estructura y evoluci ́on estelar considerar s ́olo el…
Estado: defended (16/09/2013)
Estudiante: Protasio, Cristina
Supervisada por: Aldo Serenelli
Universidad: Universitat Autònoma de Barcelona

El interior de las estrellas es un medio fuertemente estratificado cuya estructura est ́a determinada, en gran medida, por los gradientes de temperatura y composici ́on qu ́ımica presentes. Sin embargo, es pr ́actica comu ́n en modelos de estructura y evoluci ́on estelar considerar s ́olo el gradiente de temperatura como responsable del desarrollo de inestabilidades din ́amicas tales como la convecci ́on.

En este trabajo, se considera una generalizaci ́on del estudio de inestabilidades din ́ami- cas teniendo en cuenta tambi ́en la presencia de un gradiente de composici ́on qu ́ımica. De esta manera, se tiene en cuenta la posibilidad de que, adem ́as de convecci ́on, otro tipo de procesos din ́amicos tales como la semiconvecci ́on y la convecci ́on termohalina ocurran en el interior de las estrellas y modifiquen su estructura, principalmente a trav ́es de procesos macrosc ́opicos de mezcla de la composici ́on qu ́ımica.

El c ́odigo de evoluci ́on estelar GARSTEC se ha modificado para incluir dicha ge- neralizaci ́on de los criterios de inestabilidad y los procesos de mezcla asociados. Como aplicaci ́on particular, el inter ́es se centra en el estudio de modelos de evoluci ́on solar donde un gradiente de composici ́on qu ́ımica inverso (es decir, donde el peso molecular medio del material aumenta hacia el exterior) est ́a presente en las primeras fases evolu- tivas del Sol como resultado de un proceso de acreci ́on de materia proveniente del disco protoplanetario durante el proceso de formaci ́on del sistema solar. La motivaci ́on para estudiar esta clase de modelos solares es doble: 1) es un intento de construir modelos solares que puedan reproducir la estructura solar inferida a trav ́es de t ́ecnicas helios ́ısmi- cas, 2) observaciones de estrellas gemelas al Sol (solar twins) sugieren que la composici ́on de las capas externas del Sol es pobre en elementos refractarios que fueron capturados en los planetas rocosos, como resultado de un proceso de acreci ́on de materia qu ́ımicamente procesada en el disco protoplanetario.

El principal resultado de esta investigaci ́on refleja que, para la clase de modelos solares con acreci ́on que se ha estudiado, el convecci ́on termohalina es un proceso de homeni- zaci ́on de la composici ́on qu ́ımica eficiente, que opera en escalas de tiempo mucho m ́as cortas que la edad solar. Las propiedades de los modelos solares, por ejemplo la compo- sici ́on de sus capas externas, son modificadas por este proceso de manera apreciable, con cambios que son mayores a la sensibilidad de las mediciones actuales. Se concluye, por lo tanto, que en particular la convecci ́on termohalina es un proceso f ́ısico que debe ser incorporado en la descripci ́on f ́ısica de los modelos solares.
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Institute of Space Sciences (IEEC-CSIC)

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An institute of the Consejo Superior de Investigaciones Científicas

An institute of the Consejo Superior de Investigaciones Científicas
Affiliated with the Institut d'Estudis Espacials de Catalunya

Affiliated with the Institut d'Estudis Espacials de Catalunya