Ongoing PhD theses

Number of entries: 13

Molecular cores, disk and jets: the effect of the magnetic field.

Status: ongoing (16/05/2020)
Student: Nacho Añez López
Supervised by: Josep Miquel Girart Medina; Gemma Busquet
University: Universitat de Barcelona

We performed a double approach to better understand the formation process for high mass stars and their environments. First, we study and model an unique angular resolution and sensitivity an accretion disk around a 20 M☉. We  use the standard flare disk models for Sun-like stars to scale-up their properties to high mass stars. Second, we study in a multi-wavelength, multi-scale approach the role of the magnetic fields around massive stars, focusing on the effect of the magnetic field in the core fragmentation process. 
 

Cosmology with Galaxy Surveys

Status: ongoing
Student: Alex Alarcon Gonzalez
Supervised by: Enrique Gaztañaga
University: Universitat Autònoma de Barcelona

We use PAU Survey data to improve measurements of  photometric redhifts

Techniques in Observational Cosmology

Status: ongoing
Student: Roger Oliva Balagué
Supervised by: Emilio Elizalde
University: Universitat de Barcelona

Stellar activity effects on high-precision radial velocities: theory and observations

Status: ongoing
Student: Rosich, A.
Supervised by: Ignasi Ribas Canudas
University: Universitat de Barcelona

Magnetic environment and magnetic-induced forces in LISA Pathfinder

Status: ongoing
Student: Juan Pedro López Zaragoza
Supervised by: Miquel Nofrarias Serra
University: Universitat Autònoma de Barcelona

The differential acceleration measurement between two free-falling test masses on-board LISA Pathfinder is limited in the low frequency regime by force noise applied to the test masses. Several effects can contribute as force noise on the inertial masses and, among them, magnetically-induced forces are precisely one of these effects limiting the perfomance of the instrument in the millihertz band. The origin of this disturbance is the coupling of the residual magnetisation and susceptibility of the test masses with the environmental magnetic field. In order to fully understand this term of the noise model, a set of coils and magnetometers are integrated as a part of the LISA Pathfinder diagnostics subsystem.

This theses describes the magnetic environment on-board and how are we modelling the different spacecraft contributions. We reporta as well on the magnetic experiments we have carried on board to determine the magnetic parameters of the Test Masses and the estimation of the magnetic contribution to the LISA Pathfinder noise spectrum.

Stellar activity and exoplanets of M dwarfs from CARMENES visible to near-infrared spectroscopy

Status: ongoing
Student: Marina Lafarga Magro
Supervised by: Ignasi Ribas Canudas

La tesi utilitzarà dades obtingudes amb l’instrument CARMENES, que operarà entre el 2016 i el 2018 al telescopi de 3.5m de Calar Alto (Almeria). CARMENES és un instrument desenvolupat a través d’una col·laboració d’institucions alemanyes i espanyoles, format per dos espectrògrafs que permetran obtenir espectroscòpia d’alta resolució per a estrelles de massa baixa. S’espera poder derivar velocitats radials prou precises per a detectar el moviment keplerià causat per l’efecte gravitatori d’exoplanetes de tipus terrestre situats en la zona d’habitabilitat de les estrelles observades.

Modeling galaxy clustering for precision cosmology

Status: ongoing
Student: Anna Maria Porredon Díez de Tejada
Supervised by: Martin Crocce ; Pablo Fosalba Vela
University: Universitat Autònoma de Barcelona

One of the fundamental goals of Cosmology is to understand how the Universe has evolved to form the distribution of large-scale structures that we observe today. Cosmological models can predict the properties of this distribution given certain values of the cosmological parameters like, for example, the expansion rate of the Universe, the dark energy density and the percentage of matter (dark matter and baryonic) with respect to the total energy density of the Universe.   Over the past two decades, large galaxy surveys such as the Sloan Digital Sky Survey (SDSS; York et al. 2000), the WiggleZ Dark Energy Survey (Blake et al. 2011) and the Baryon Oscillation Spectroscopic Survey (BOSS; Dawson et al. 2013) have enabled to study in detail the large-scale structure of the Universe, and galaxy clustering has become a powerful tool to study galaxy formation and evolution and to tighten constraints on cosmological parameters. This data complements the information coming from cosmic microwave background (CMB) experiments, the most recent and with more quality being the ones collected by the Planck satellite, of the European Space Agency (ESA) (Planck Collaboration: Ade et al. 2015).   Future galaxy surveys will cover a greater volume and will collect images of better quality than those obtained so far. This thesis aims to analyse the distribution of galaxies from the observations of  future surveys in which the host group participates actively, such as the Dark Energy Survey (DES), the Dark Energy Spectroscopic Instrument (DESI), Physics of the Accelerating Universe (PAU) and the Euclid spatial mission from the ESA.   For this purpose, during the thesis project we will develop numerical tools that allow us, in first place, to adequately model the observables with the complexity and detail needed to match the properties of future observations and, in second place, the optimal exploitation of such observations in order to obtain high precision limits to the values of cosmological parameters.

ESTUDIOS SOBRE LA INTERACCION PLASMA-CAMPO MAGNETICO EN ESCENARIOS ASTROFISICOS EXTREMOS

Status: ongoing
Student: Enrique Mestre Guillén
Supervised by: Emma de Ona Wilhelmi; Diego F. Torres
University: Universitat Autònoma de Barcelona

Investigation of the complex pulsar, their winds and the progenitor SNRs through  observations of the dynamical evolution and related energetic processes in SNRs and PWNe, development of state-of-the-art modelling of the plasma/magnetic interaction in PWNe and young SNRs. Weak magnetic field, high plasma density interactions in astrophysical scenarios, understanding acceleration of cosmic rays and hadronic interaction via observations of evolved SNRs interacting with molecular clouds. To achieve that, we will investigate the broadband spectrum from radio to TeV energies not only from the SNR itself but also from its environment. These observations will serve as input for detailed modeling to constrain diffusion of particles in our Galaxy.

Cosmology with narrowband photometric redshifts

Status: ongoing
Student: Andrea Pocino Yuste
Supervised by: Francisco Javier Castander Serentill
University: Universitat Autònoma de Barcelona

In this thesis we want to use the observational data obtained with PAUS, to develop numerical tools to allow us to work with the observed data and to optimally exploit the informaction about the galaxy redshifts. We will also prepare for the Euclid mission.

Impact hazard associated with large meteoroids from disrupted asteroids and comets

Status: ongoing
Student: Moreno-Ibáñez, M.
Supervised by: Josep M. Trigo-Rodríguez ; Gritsevich, M.
University: Universitat Autònoma de Barcelona

The main objective of this PhD Thesis is to get deeper knowledge on the physical and dynamic properties of large meteoroids during and before their interaction with the Earth’s atmosphere. This will be done through the more specific objectives:
  • Analysis of atmospheric flight dynamics.
  • Physical properties of meteoroids.
  • Association of large meteoroids with comets and asteroids.
  • Gain comprehension on the fracture mechanisms and orbit evolution of meteoroids and their celestial parents.
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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