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Generalized investigation of the rotation-activity relation: Favouring rotation period instead of Rossby number
A. Reiners, M. Schuessler, V. M. Passegger
Magnetic activity in Sun-like and low-mass stars causes X-ray coronal emission, which is stronger for more rapidly rotating stars. This relation is often interpreted in terms of th…
A laser-lock concept to reach cm/s-precision in Doppler experiments with Fabry-Perot wavelength calibrators
A. Reiners, R. K. Banyal, R. G. Ulbrich
State-of-the-art Doppler experiments require wavelength calibration with precision at the cm/s level. A low-finesse Fabry-Perot interferometer (FPI) can provide a wavelength comb w…
MHD simulations of near-surface convection in cool main-sequence stars
Benjamin Beeck, Manfred Schüssler, Ansgar Reiners
The solar photospheric magnetic field is highly structured owing to its interaction with the convective flows. Its local structure has a strong influence on the profiles of spectra…
Concept and optical design of the cross-disperser module for CRIRES+
E. Oliva, A. Tozzi, D. Ferruzzi +31
CRIRES, the ESO high resolution infrared spectrometer, is a unique instrument which allows astronomers to access a parameter space which up to now was largely uncharted. In its cur…
Formation of starspots in self-consistent global dynamo models: Polar spots on cool stars
Rakesh K. Yadav, Thomas Gastine, Ulrich R. Christensen +1
Observations of cool stars reveal dark spot-like features on their surfaces. Compared to sunspots, starspots can be bigger or cover a larger fraction of the stellar surface. While…
Two planets around Kapteyn's star : a cold and a temperate super-Earth orbiting the nearest halo red-dwarf
Guillem Anglada-Escudé, Pamela Arriagada, Mikko Tuomi +21
Exoplanets of a few Earth masses can be now detected around nearby low-mass stars using Doppler spectroscopy. In this paper, we investigate the radial velocity variations of Kaptey…