Marina Lafarga Magro
I am a Postdoctoral Research Fellow in the Astronomy & Astrophysics groupLink opens in a new window at the University of Warwick working on exoplanets and cool stars with Dr Heather CeglaLink opens in a new window's research group Towards Other Earths.
For more information see: https://mlafarga.github.io/
I am currently working on the implementation of a Bayesian approach to compute radial velocities of cool stars based on the ideas presented in Zucker et al. 2003Link opens in a new window. I am also studying the alignment between the planetary orbit and the stellar spin of a set of planets in the Neptunian desert. To do that, I make use of the Rossiter-McLaughlin distortion observed in spectroscopic observations during a planetary transit, which is sensitive to the spin-orbit angle of the system. Additionally, I am also trying to study the variability of the star behind the transit chord through the "reloaded" Rossiter-McLaughlin approach, which isolates the stellar light behind the planet as it transits.
Also at Warwick, in collaboration with Dr Matteo Brogi, I worked on the characterisation of the atmosphere of the bloated super-Neptune WASP-166 b. I focused on the application of the cross-correlation method to simultaneously study the presence of water and clouds on the planetary atmosphere using high-resolution, optical observations of the instrument ESPRESSO. I also worked on improving a principal component analysis technique to mitigate the effect of telluric lines in the observed spectra.
Previously, I completed my PhD under the supervision of Dr Ignasi Ribas at the Institut de Ciències de l'Espai (IEEC, CSIC)Link opens in a new window and the Universitat Autònoma de Barcelona, working on the exploitation of high resolution spectra of M dwarf stars obtained with the CARMENESLink opens in a new window instrument. I led the development and application the cross-correlation technique for CARMENES GTO observations. This work resulted in an open source pipeline (
raccoon)Link opens in a new window to build weighted binary masks, compute cross-correlation functions, and derive radial velocities and stellar variability indicators. I also studied the effects of stellar variability in M dwarf high-resolution spectra using CARMENES data. In particular, I analysed the temporal behaviour of several spectroscopic proxies of stellar activity in a range of M dwarfs of different mass and activity level. I also performed line-by-line studies in a set of active M dwarf stars.
First author refereed publications
4. Lafarga, M., Brogi, M., Gandhi, S., Cegla, H. M., et al., 2023, "The hot Neptune WASP-166 b with ESPRESSO III: A blue-shifted tentative water signal constrains the presence of clouds", accepted for publication in MNRAS, arXiv: 2302.04794
3. Lafarga, M., Ribas, I., Zechmeister, M., Reiners, A., et al., 2023, "The CARMENES search for exoplanets around M dwarfs. Sensitivity to activity of M dwarf spectral lines", accepted for publication in A&A, arXiv: 2302.07916
2. Lafarga, M., Ribas, I., Reiners, A., Quirrenbach, A., et al., 2021, "The CARMENES search for exoplanets around M dwarfs. Mapping stellar activity indicators cross the dwarf domain", A&A, 652, A28, DOI: 10.1051/0004-6361/202140605Link opens in a new window
1. Lafarga, M., Ribas, I., Lovis, C., Perger, M., et al., 2020, "The CARMENES search for exoplanets around M dwarfs. Radial velocities and activity indicators from cross-correlation functions with weighted binary masks" A&A, 636, A36, DOI: 10.1051/0004-6361/201937222Link opens in a new window