52 citations · 212 across the 27 of their papers we have counts for
9 papers · 1 filter
3D non-LTE modeling of the stellar center-to-limb variation for transmission spectroscopy studies
G. Canocchi, K. Lind, C. Lagae +5
Context. Transmission spectroscopy is one of the most powerful techniques to characterize transiting exoplanets since it allows to measure the abundance of the atomic and molecular…
Ground-breaking Exoplanet Science with the ANDES spectrograph at the ELT
Enric Palle, Katia Biazzo, Emeline Bolmont +56
In the past decade the study of exoplanet atmospheres at high-spectral resolution, via transmission/emission spectroscopy and cross-correlation techniques for atomic/molecular mapp…
Center-to-limb variation of spectral lines and their effect on full-disk observations
Alexander G. M. Pietrow, Adur Pastor Yabar
An accurate description of the center-to-limb variation (CLV) of stellar spectra is becoming an increasingly critical factor in both stellar and exoplanet characterization. In part…
Spectral Background-Subtracted Activity Maps
Carsten Denker, Meetu Verma, Alexander G. M. Pietrow +2
High-resolution solar spectroscopy provides a wealth of information from photospheric and chromospheric spectral lines. However, the volume of data easily exceeds hundreds of milli…
Stellar surface information from the Ca II H&K lines I. Intensity profiles of the solar activity components
M. Cretignier, A. G. M. Pietrow, S. Aigrain
The detection of Earth-like planets with the radial-velocity method is currently limited by the presence of stellar activity signatures. On rotational timescales, spots and plages…
Why every observatory needs a disco ball
Robert J. Cumming, Alexander G. M. Pietrow, Livia Pietrow +5
Commercial disco balls provide a safe, effective and instructive way of observing the Sun. We explore the optics of solar projections with disco balls, and find that while sunspot…
A comparative study of two X2.2 and X9.3 solar flares observed with HARPS-N: Reconciling Sun-as-a-star spectroscopy and high-spatial resolution solar observations in the context of the solar-stellar connection
A. G. M. Pietrow, M. Cretignier, M. K. Druett +14
Stellar flares cannot be spatially resolved, which complicates ascertaining the physical processes behind particular spectral signatures. Due to their proximity to Earth, solar fla…
Solar oxygen abundance using SST/CRISP center-to-limb observations of the O I 7772 Å line
A. G. M. Pietrow, R. Hoppe, M. Bergemann +1
Solar oxygen abundance measurements based on the O I near-infrared triplet have been a much-debated subject for several decades since non-local thermodynamic equilibrium (NLTE) cal…
Did Christiaan Huygens need glasses? A study of Huygens' telescope equations and tables
A. G. M. Pietrow
In the later stages of his life, Christiaan Huygens semi-empirically derived a set of relations between the objective focus and diameter, the eyepiece focus, and the magnification…