Diego Godoy-Rivera
Supervising
Supervising
I've had the privilege of supervising many talented students. Some of their amazing work is summarized below. If you are interested in working with me, please feel free to reach out at [email protected]
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Alejandro Castro Lorenzo
Alejandro and I collaborated during his B.Sc. studies (Universidad de la Laguna, Spain). Alejandro carried out his undergraduate research internship under my supervision, together with Dr. Ana Escorza (IAC, Spain). Alejandro's work was framed in the context of Barium (Ba) stars, targets that provide key insights in our understanding of the origin of chemical elements. While Ba stars are typically confirmed with dedicated high-resolution spectroscopic observations, Alejandro studied the prospects for identifying candidate targets leveraging large spectroscopic surveys, and in particularly APOGEE based on Cerium (Ce). Alejandro selected Ba-star candidates with different levels of confidence, and compared them with the abundances measured in the GALAH survey, as illustrated in the accompanying figure. |
Comparison of the s-process element abundance from GALAH (averaged across the available s-process elements) with the Ce abundance from APOGEE (single element abundance). Different types of non-single star (NSS) systems are flagged with the markers.
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Shivam Kumar
Shivam and I collaborated during his B.Sc. studies (Indian Institute of Science Education and Research, India). Shivam carried out a research internship under my supervision, together with Dr. Savita Mathur (IAC, Spain) and Dr. Rafael García (CEA, France). Shivam studied the connection between asteroseismology and magnetic activity. Using data bases from the literature, he analyzed the dependence of the amplitude of asteroseismic oscillations with the Sph index. In particular, he tested the how well the measured amplitudes could be predicted from measurements of Sph in combination with other classical stellar parameters (luminosity, mass, effective temperature). An illustration of Shivam's work is shown in the accompanying figure. |
Comparison of measured amplitudes with predicted values by fitting the dependencies on stellar parameters (L, M, Teff) and activity index (Sph).
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Inès Amestoy
Inès and I collaborated during her M.Sc. studies at University of Toulouse III, Paul Sabatier. Inès carried out her M.Sc. thesis under my supervision, together with Dr. Paul Beck, at the Instituto de Astrofísica de Canarias (IAC). Inès led a dedicated study of an eclipsing, oscillating, double-line spectroscopic binary. She analyzed the TESS light curve and Las Cumbers Observatory (LCO) radial velocities, and modeled the system using the Phoebe software to derive the primary's dynamical mass. This is illustrated on the accompanying figure. From the asteroseismic frequencies, she also derived the seismic mass of the primary star, and compared both estimates to test asteroseismic scaling relations. Inès successfully defended her M.Sc. thesis and presented her work in multiple conferences. Check out her work: Amestoy, Godoy-Rivera, Beck, et al. (2025). |
Fit to the LCO radial velocity (top) and TESS light curve (bottom) for the eclipsing, oscillating, double-line spectroscopic binary target.
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Joaquín Silva-Beyer
Joaquín and I collaborated during his B.Sc. and M.Sc. studies at Pontificia Universidad Católica de Chile. Joaquín studied how the existing gyrochronology relations, an important technique to age-date field stars, degrade towards old ages. For this, he designed the Delta_Prot,gyro test, and applied it to a sample of open clusters with measured rotation periods, as well as to wide binary stars observed by Kepler. Our fruitful collaboration resulted in a published paper led by Joaquín in MNRAS: Silva-Beyer, Godoy-Rivera & Chanamé (2023). |
Definition of the "Delta_Prot,gyro" parameter. The measured rotation period for a star is compared with the value expected given the location of a co-eval companion on the rotation period vs. Gaia (BP-RP) color diagram.
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