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- Centre National de la Recherche ScientifiqueFR157 papers
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9 papers · 2 filters
Towards understanding stellar variability at the sub m/s level: granulation-induced variability across the optical spectrum
Cis Lagae, Ginger Frame, Heather M. Cegla +5
Detecting the radial velocity signal of Earth-mass exoplanets requires the characterisation and removal of granulation-induced radial velocity variability from spectroscopic observ…
The Fe I 4377 Å Line as a Solar Faculae Indicator: Insights from Spectral Ratio Analysis
Katlyn L. Hobbs, Christopher A. Watson, Jean C. Costes +21
Faculae are a dominant source of stellar activity noise in radial velocity measurements, yet their low contrast and broad surface distribution make them difficult to track in disc-…
An interstellar energetic and non-aqueous pathway to peptide formation
Alfred Thomas Hopkinson, Ann Mary Wilson, Joe Pitfield +13
The origin of the molecular building blocks of life is a central question in science. A few -amino acids such as glycine, the simplest proteinogenic amino acid, have been detect…
Height Dependent Phase Shifts of Wave Pulses in the Lower Solar Atmosphere Measured with SUNRISE III
Andreas Lagg, H. N. Smitha, Sami K. Solanki +32
We report on the measurement of the height-dependent time shifts of wave pulses in the lower solar atmosphere from high-resolution spectro-polarimetric observations obtained with t…
Spectral Ratio Analysis: probing of a new suite of stellar activity indicators as a tool for astrophysical noise mitigation
Jean C. Costes, Christopher A. Watson, Ernst de Mooij +6
Stellar activity is the main barrier to detecting and/or confirming low-mass/long-period (and Earth-analogue) planets using radial-velocity (RV) measurements. Searching for reliabl…
Multi-height Identification of Sausage and Fluting Eigenmodes in a Solar Pore
Shahin Jafarzadeh, David B. Jess, Marco Stangalini +34
Magnetic pores are compact, strongly magnetised waveguides in the lower solar atmosphere and therefore provide favourable conditions for identifying magnetohydrodynamic (MHD) wave…