I am an astrophysicist with an expertise in asteroseismology and magnetic activity of cool stars. Part of my research is dedicated to using data from Kepler and TESS to measure the core rotation rate as well as the inclination angle of the rotation axis of red giants based on the analysis of their mixed oscillation modes. I am also analyzing spectroscopic data from LAMOST to infer the level of magnetic activity in the chromosphere of cool stars and investigate the impact of tidal interactions. Another aspect of my research consists in characterizing the rotation profile as a function of latitude at the photosphere of active cool stars using simulated PLATO light curves.
Education and Employment:
- Since 2021: Postdoc, MPS, Gottingen.
- 2019 – 2021: Junior Investigator, Centro de Astrofisica da Universidade do Porto (CAUP), Portugal.
- 2018 – 2019: Teaching and Research Assistant (ATER), LESIA, Observatoire de Paris, Meudon, France.
- 2015 – 2018: PhD thesis, Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique (LESIA), Observatoire de Paris, Meudon, France.
Most important publications:
- Gehan, C.; Campante, T. L.; Cunha, M. S.; Pereira, F.: FRA-A new fast, robust, and automated pipeline for the detection and measurement of solar-like oscillations in time-series photometry of red-giant stars. Astronomische Nachrichten 344, 5 (2023)
- Gehan, C.; Gaulme, P.; Yu, J.: Surface magnetism of rapidly rotating red giants: Single versus close binary stars. Astronomy and Astrophysics 668, A116 (2022)
- Gehan, C.; Mosser, B.; Michel, E.; Cunha, M. S.: Automated approach to measure stellar inclinations: validation through large-scale measurements on the red giant branch. Astronomy and Astrophysics 645, A124 (2021)
- Gehan, C.; Mosser, B.; Michel, E.; Samadi, R.; Kallinger, T.; Core rotation braking on the red giant branch for various mass ranges. Astronomy and Astrophysics 616, A24 (2018)