IAP weekly specialised seminars / 25 October 2024

Eder Martioli (Laboratório Nacional de Astrofísica, Itajubá, Brazil)

The discovery of thousands of transiting exoplanets from space-based and ground-based surveys has yielded a rich dataset for studying planetary characteristics and testing models of planet formation and evolution. Follow-up observations are crucial for a thorough understanding of these systems. In this talk, I will discuss how high-resolution spectroscopy, imaging, and polarimetry — spanning optical and near-infrared wavelengths — are used together to improve the physical characterization of exoplanets and their host stars, as well as to explore their origins. I will present several planetary systems detected by our team using photometric data from NASA’s TESS mission, along with high-resolution spectroscopy from SPIRou, SOPHIE, and MAROON-X. Additionally, I will introduce a survey of transiting planets that uses multi-band, high-cadence photometric and polarimetric observations, conducted with the new SPARC4 instrument at the Pico dos Dias Observatory in Brazil. By analyzing light curves across four simultaneous bands, we evaluate stellar phenomena such as limb darkening and variability, while precisely measuring transit depths and conjunction times. This survey helps confirm planet candidates found by larger surveys and lays the groundwork for more extensive planetary detection and confirmation efforts.

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