Finalized Bachelor theses

Número de entradas: 9

Understanding the Dynamics of Young Stellar Clusters

Estado: defended (05/09/2018)
Estudiante: Arnau Saborido Morales
Supervisada por: Gemma Busquet ; Josep Miquel Girart Medina
Universidad: Universitat Autònoma de Barcelona

In the Interstellar Medium, star formation occurs in regions where density is high and the temperature is low, that leads to the Molecular Clouds, which are the places where stars are born. In order to observe these star formation sites, we use the emission of the ammonia (1,1) and (2,2) transitions, obtained…
Estado: defended (05/09/2018)
Estudiante: Arnau Saborido Morales
Supervisada por: Gemma Busquet ; Josep Miquel Girart Medina
Universidad: Universitat Autònoma de Barcelona

In the Interstellar Medium, star formation occurs in regions where density is high and the temperature is low, that leads to the Molecular Clouds, which are the places where stars are born. In order to observe these star formation sites, we use the emission of the ammonia (1,1) and (2,2) transitions, obtained by the Green Bank Telescope. This project pretends to analyze the Pipe’s Nebula region Barnard 59 using temperature, velocity and emission line width maps, as well as look into the Young Stellar Objects that are being formed within it, its distribution, itsmolecular outflows and the overall structure and kinematics of the core alongside the spiral arms around it. In order to do that, we have used the HfS, a tool that adjusts pixel by pixel the hyperfine structure of the NH3 emission lines. First of all, there is going to be an introduction to the basics, which are the InterstellarMedium, star formation, the Pipe Nebula and Barnard 59. Then, we will look into the molecular transitions and the technical aspects of the performed observations. Later, we will explain how the HfS tool works and the results of the analysis for every mapped area. To sum up, the conclusions of the project will be given.

Characterization of Chemical Composition and Alteration Processes in Antarctic Carbonaceous Chondrite GRA 95229

Estado: defended (01/02/2017)
Estudiante: Cabedo Soto, V.
Supervisada por: Josep M. Trigo-Rodríguez
Universidad: Universitat Autònoma de Barcelona

Chondrites are undifferentiated meteorites that are representative of the materials forming the protoplanetary disk, about 4.5 Ga ago, because their parent bodies did not chemically differentiate, due to their size smaller than a few hundred kilometers. These meteorites are interesting samples because…
Estado: defended (01/02/2017)
Estudiante: Cabedo Soto, V.
Supervisada por: Josep M. Trigo-Rodríguez
Universidad: Universitat Autònoma de Barcelona

Chondrites are undifferentiated meteorites that are representative of the materials
forming the protoplanetary disk, about 4.5 Ga ago, because their parent bodies did not
chemically differentiate, due to their size smaller than a few hundred kilometers. These
meteorites are interesting samples because they exhibit bulk compositions close to the
original ones when they accreted. Most chondrites have only suffered mild thermal
alteration, but some exhibit clear evidence of wet accretion and ulterior aqueous
alteration, which exemplify its post-accretionary history and evolution. The study of these
parent body processes, from the evidence preserved in chondrites, is very interesting
because it can lead to understand the pathways of Solar System formation and its
evolution. Carbonaceous chondrites, a specific class of chondrites, are especially
interesting because they contain large amounts of organic matter that can provide some
clues on how life could have evolved here on Earth.  
The subject of study of this work is Graves Nunataks 95229 (GRA 95229), a CR2
chondrite from the NASA Antarctic collection. It is a very pristine sample with interesting
signs of alteration processes and it exhibits a fascinating proportion of organic complex
compounds, about one order of magnitude higher than the famous Murchinson CM2
chondrite.  The aim of this work is to undergo a mineralogical and petrological analysis of GRA
95229 using different spectroscopic techniques; i. e., SEM/EDX and Raman
spectroscopy, to obtain clues about the alteration effects caused by parent body
alteration and the collisions suffered by it. Additionally, quantum mechanical methods
have been used to simulate the Raman spectra of different minerals, commonly present
in meteorites, and they have been compared to the experimental spectra to identify more
precisely the mineral composition and the signs of alteration and thermal annealing
experienced by this meteorite as consequence of shock.
 

Active Thermal Control System for ARIEL Telescope

Estado: defended (31/01/2017)
Estudiante: Carles Sierra Roig
Supervisada por: Lluís Gesa Boté
Universidad: Universitat de Barcelona

This document describes and summarizes the design process carried out in Institut de Ciències de l'Espai to define the baseline architecture of the Telescope Control Unit for the next possible M4 ESA mission: Atmospheric Remote-sensing Exoplanet Large-survey (a.k.a. ARIEL), as well as a more accurate…
Estado: defended (31/01/2017)
Estudiante: Carles Sierra Roig
Supervisada por: Lluís Gesa Boté
Universidad: Universitat de Barcelona

This document describes and summarizes the design process carried out in Institut de Ciències de l'Espai to define the baseline architecture of the Telescope Control Unit for the next possible M4 ESA mission: Atmospheric Remote-sensing Exoplanet Large-survey (a.k.a. ARIEL), as well as a more accurate study of its thermal subsystem, as Final Degree Project for the Barcelona University. The document shows the work done in ARIEL mission, as well as the work done for the FDP: the analysis of possible solutions for the thermal subsystem, the selection of components and their expected behavior, the hardware and software design of the acquisition board as well as its implementation and test, respecting space qualified engineering methodologies. It excludes an exhaustive description of the off-the-shelf digital system Red Pitaya and accurate space qualifications tests, due to the prototype status of the implemented acquisition board

Comparació dels algoritmes CLUMPFIND i DENDROGRAMS en la identificació d'estructures en núvols moleculars

Estado: defended (14/09/2016)
Estudiante: Luis Aranda
Supervisada por: Gemma Busquet ; Josep Miquel Girart Medina
Universidad: Universitat Autònoma de Barcelona

El procès de formació estel.lar sovint té lloc en cúmuls on es formen entre desenes i centenes d'estels. Per entendre el procés de formació estel.lar sembla necessari primer entendre les condicions inicials de la formació dels cúmuls. Utilitzant dos algoritmes diferents (CLUMPFIND i DENDROGRAMS),…
Estado: defended (14/09/2016)
Estudiante: Luis Aranda
Supervisada por: Gemma Busquet ; Josep Miquel Girart Medina
Universidad: Universitat Autònoma de Barcelona

El procès de formació estel.lar sovint té lloc en cúmuls on es formen entre desenes i centenes

d'estels. Per entendre el procés de formació estel.lar sembla necessari primer entendre les

condicions inicials de la formació dels cúmuls. Utilitzant dos algoritmes diferents (CLUMPFIND i

DENDROGRAMS), el nostre objectiu serà analitzar i comparar els resultats obtinguts en la

identificació de regions de formació estel.lar. Aquests algoritmes funcionen sota uns paràmetres

lliures pels quals primerament haurem de trobar els seus valors òptims per tal obtenir els millors

resultats. Utilitzant com a referència el catàleg del Spitzer d'en Peretto & Fuller (2009) podem

determinar la qualitat dels resultats obtinguts amb cada mètode, i triant les millors podrem derivar

algunes propietats físiques d'aquestes estructures estel.lars. En comparar directament els dos

mètodes, resulta evident veure com en el cas del Dendrograms el pes que tenen els paràmetres

lliures en la qualitat dels resultats no és tan gran com en el cas del Clumpfind. Per altra banda tenim

l'avantatge que el Dendrograms ens proporciona l'estructura jeràrquica de les regions mitjançant uns

dendrogrames. Una altra diferència fonamental la trobem en la metodologia dels algoritmes,

concretament en la forma d'associar els píxels als màxims locals. En el Clumpfind tot píxel té un

màxim local associat i això pot donar com a resultat una forma poc acurada del clumps, i que en

alguns casos pot arribar a ser errònia.

Study of thermal disturbances at low frequency in high precision optical metrology

Estado: defended (05/07/2016)
Estudiante: Alex Torrents Rufas
Supervisada por: Miquel Nofrarias Serra
Universidad: Universitat Politècnica de Catalunya

The study is part of a project funded by the European Union thanks to the program Marie Curie Career Integration Grant entitled Gravitational Wave Detectors Low-Frequency Technology Test Bed (GRLOW). The study has been performed at the installations of Institut de Ciencies de l’Espai(CSIC-IEEC). The…
Estado: defended (05/07/2016)
Estudiante: Alex Torrents Rufas
Supervisada por: Miquel Nofrarias Serra
Universidad: Universitat Politècnica de Catalunya

The study is part of a project funded by the European Union thanks to the program Marie Curie Career Integration Grant entitled Gravitational Wave Detectors Low-Frequency Technology Test Bed (GRLOW). The study has been performed at the installations of Institut de Ciencies de l’Espai(CSIC-IEEC). The main objective for GRLOW is to achieve an optical metrology with a picometer sensitivity for low frequencies by means of a deep phase modulation interferometry technique. Field-Programable Gate Array (FPGA) incuding a LEON3 soft-core processor with the purpose of develop a real time function fitting, getting out results at the moment. The interferometer has to be nested inside an ultra-stable environment to eliminate perturbations. The perturbations that can disturb the interferometer are air particles and temperature fluctuations. Here is where our study takes place: we want to achieve a ultra-stable thermal environment attenuating, by the vacuum chamber and thermal shields, or controlling, by a proportional-derivative-integral temperature controller, perturbations that may occur in the lab. Finally, our aim is to determinate the contribution of the temperature noise into the interferometer.     

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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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