Diego Lorenzo de Oliveira

I am Diego Lorenzo-Oliveira, a South American (Brazilian) astrophysicist dedicated to high-precision spectroscopic characterization of Sun-like stars (FGK) and low-mass stars (M dwarfs). My research aims to unravel how stellar magnetic activity, rotation, chemical composition, and age are interconnected over billions of years. By refining age-dating techniques, I strive to establish reliable testbeds and benchmarks for comparative analysis, accurately placing the Sun within a coherent evolutionary context. Since 2007, I have been developing methodologies to measure stellar activity using chromospheric indicators such as Ca II HK, Ca II infrared triplet (IRT), and Halpha lines. These techniques have enabled me to establish robust chromospheric chronometers for FGK stars, achieving unprecedented precision for asteroseismic targets, old open clusters (e.g., M 67 and NGC 188, with ages of 4 and 6 Gyr, respectively), and even stars older than the Sun. My work has addressed longstanding challenges in chromospheric age determination, particularly through the development of age-mass-metallicity-activity relations (AMMAR) and solar twin studies, both of which have effectively mitigated biases in conventional activity-rotation-age relations. While developing magnetic clocks, my research naturally intersected with the broader issue of the Solar Uniqueness Puzzle. Although I was aware of this well-known problem beforehand, insights gained from previous studies gradually pushed me towards this new line of investigation. This progression led to my current effort to characterize whether the Suns magnetic, convective mixing, and rotational behavior are typical or anomalous compared to other solar twins and analogs of similar evolutionary status. Observationally uncovering these patterns provides new constraints on the evolution of large-scale stellar dynamo processes and the Suns evolutionary path relative to other stars with similar characteristics. I have published more than 30 peer-reviewed articles, including 24 as first author or major contributor (H-index = 16, Google Scholar, updated in 03/2025) in high-profile international peer-reviewed journals. From the observational side, I have experience involving observations, project development, pipeline construction, and data analysis. My projects have been approved at several telescopes worldwide, notably including 14 nights of HARPS time awarded as Principal Investigator (PI). I have delivered 13 invited talks at prestigious institutions worldwide, including NASA-JPL, ESO, Carnegie Observatories, AIP-Potsdam, and Exeter University, along with several contributed talks at international conferences. Recently, I was invited to give a review talk on stellar magnetic chronometers at the conference Fifty Years of the Skumanich Relations, celebrating the 50th anniversary of the seminal paper that laid the foundation for my area of research (Skumanich, 1972, ApJ, 171, 565). I have also led research efforts focused on developing techniques and automated tools to characterize solar-type stars and investigate their rotational and magnetic evolution over secular timescales. These efforts are aimed at enhancing the precision and accuracy of spectroscopic data analysis, providing valuable insights into stellar evolution and contributing to a refined understanding of how stars like the Sun evolve over time. (Source: Lattes Curriculum)