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Bridging the gap: Translating high-resolution solar observations to the stellar regime

Alexander Pietrow
Leibniz Institute for Astrophysics Potsdam, Germany

As telescopes and instruments provide ever more detailed observations of the night sky, previously negligible effects come to the forefront. This in turn requires once simple models to incorporate increasing complexity to explain the observed data, often with no clear way to test their appropriateness. The Sun is an obvious test bed for such studies, as many small-scale features on its surface can be resolved due to its large angular size and proximity to Earth. However, most high spatial and temporal resolution observations are inherently limited by a small field of view, making it difficult to compare them in a Sun-as-a-star setting. The Numerical Empirical Sun-as-a-Star Integrator (NESSI) code has been developed to overcome this limitation, and translate such observations into disk-integrated spectra. This allows specific aspects to be studied in isolation from other events on the solar disk.
In this talk I will give an overview of several Sun-as-a-star projects that are being worked on using NESSI, which range from accurate reconstruction of full-disk spectra, to the potential effects of small-scale features on stellar and exoplanet studies.

2023 November 08, 13:30

Centro de Astrofísica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia