Calendar

Speaker:  Ruggero Biondo

Titolo: Data-driven Numerical Reconstruction of the Interplanetary Parker Spiral

Abstract: Over the last decade the science community, governments and private partners have shown a growing interest in the topic of Space Weather: a broad discipline aimed to the forecasting of potential threats to space and ground-based systems and operations. The ability of the state-of-art codes to reconstruct the stationary conditions of the interplanetary plasma is still limited, as shown by the comparisons between model predictions and in-situ measurements acquired by various spacecrafts. Therefore, it is necessary to develop leaner codes and to improve the agreement between forecasts and observed data on the other. The aim of this work is to lighten the procedures involved in determining the inner heliospheric boundary and to bind the numerical simulations to direct measurements of the parameters of the interplanetary plasma. To do this, the ambient plasma parameters of the inner heliosphere are reconstructed, using the 1 AU data provided by the Solar Physics Group in INAF-Turin Astrophysical Observatory from different spacecrafts located in the lagrangian point L1 such as DSCOVR and GGS Wind, by going backwards to 0.1 AU following the spiraling arms of the Interplanetary Parker Spiral. The back-reconstructed plasma parameter at 0.1 AU are thus employed as inner boundary conditions for the solar wind expansion up to 1 AU based on a MHD simulation. This innovative approach provides a new method to reconstruct the conditions of the interplanetary plasma from the Sun to 1 AU and beyond

Speaker: Giuseppe Morello

Titolo: Towards high-precision modeling of star+exoplanet multiwavelength light-curves

Abstract: I will present new tools and methodologies purposely developed for modeling observations of transiting exoplanets and eclipsing binaries with precision down to <10 parts per million (ppm).

ExoTETHyS is a python package that aims to collect the functions needed to model the high-precision spectrophotometric observations obtained with JWST and ARIEL (not only). The current version includes a user-friendly stellar limb-darkening calculator that outperforms existing codes by one order of magnitude in terms of light-curve model accuracy. I will introduce to the current use of ExoTETHyS and discuss the planned developments.

I will also show the results from the consistent reanalyses of Spitzer and Hubble data with bayesian approaches and improved data detrending techniques.

Speaker: Fabio Reale (UNIPA)

Authors: F. Reale(1,2), P. Testa(3), A. Petralia(2), D. Graham(4), D. Kolotkov(5)
(1) Dipartimento di Fisica & Chimica, Università di Palermo;
(2) INAF-Osservatorio Astronomico di Palermo;
(3) Center for Astrophysics | Harvard & Smithsonian, Cambridge, USA;
(4) Bay Area Environmental Research Institute, NASA Research Park, Moffett Field, USA;
(5) Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry, UK

Titolo: Impulsive heating in the solar corona: large scale magnetic rearrangements

Abstract: