14 papers
From simulations to observations of cool plasma: What we can learn from synthetic spectra
V. JerÄiÄ, T. A. Kucera, A. G. M. Pietrow +2
The paper generates synthetic Mg II h&k spectra from a non‑adiabatic 2.5D MHD simulation of coronal rain and compares them with IRIS observations to assess how well the model repro…
Synthesizing Sun-as-a-star flare spectra from high-resolution solar observations
M. De Wilde, A. G. M. Pietrow, M. K. Druett +22
Spatially resolved observations of the Sun and the astronomical sample size of stellar bodies are the respective key strengths of solar and stellar observations. However, the large…
Fine-scale downflows above flare ribbons captured by Solar Orbiter/EUI
Zheng Sun, Alexander G. M. Pietrow, Malcolm K. Druett +8
In solar flares, flare ribbons map chromospheric footpoints where flare energy deposition occurs. These locations are associated with field aligned energy transport from the corona…
Transit timing and starspot-induced transit depth variations in the 17 Myr old HIP 67522 system
H. Chakraborty, M. Lendl, A. Nigioni +27
HIP 67522 is a one of the youngest multi-planetary systems discovered to date. The 17 Myr-old, Sun-like star is part of the Scorpius-Centarus OB association and is known to host tw…
Forward modeling solar spectra onto Doppler images of λ And
Ã. Adebali, A. G. M. Pietrow
By using the Doppler images of λ And, we aim to investigate whether surface temperature information can be reversed to create its activity parameters, by feeding a toy model with…
Thermal background reduction for mid-infrared imaging by low-rank background and sparse point-source modelling
R. A. R. Moens, A. G. M. Pietrow, B. Brandl +1
Mid-infrared astronomy from the ground faces critical challenges in accurately detecting and quantifying sources due to the dominant spatially and time-variable background noise. M…