253 citations · 1.4k across the 26 of their papers we have counts for
15 papers · 1 filter
eROSITA's cool star population explained
J. H. M. M. Schmitt, P. C. Schneider, S. Czesla +2
The rotation-activity connection is the standard paradigm for interpreting chromospheric and coronal activity in late-type stars, namely, stars with outer convection zones. This pa…
The CARMENES search for exoplanets around M dwarfs. Telluric absorption corrected high S/N optical and near-infrared template spectra of 382 M dwarf stars
E. Nagel, S. Czesla, A. Kaminski +22
Light from celestial objects interacts with the molecules of the Earth's atmosphere, resulting in the production of telluric absorption lines in ground-based spectral data. Correct…
The CARMENES search for exoplanets around M dwarfs. Behaviour of the Paschen lines during flares and quiescence
B. Fuhrmeister, S. Czesla, J. H. M. M. Schmitt +17
The hydrogen Paschen lines are known activity indicators, but studies of them in M~dwarfs during quiescence are as rare as their reports in flare studies. This situation is mostly…
The CARMENES search for exoplanets around M dwarfs. Variability on long timescales as seen in chromospheric indicators
B. Fuhrmeister, S. Czesla, V. Perdelwitz +19
It is clearly established that the Sun has an 11-year cycle that is caused by its internal magnetic field. This cycle is also observed in a sample of M dwarfs. In the framework of…
The CARMENES search for exoplanets around M dwarfs. Diagnostic capabilities of strong K I lines for photosphere and chromosphere
B. Fuhrmeister, S. Czesla, E. Nagel +20
There are several strong K I lines found in the spectra of M dwarfs, among them the doublet near 7700 AA and another doublet near 12 500 AA. We study these optical and near-infrare…
The CARMENES search for exoplanets around M dwarfs. Variability of the He I line at 10830 Å
B. Fuhrmeister, S. Czesla, L. Hildebrandt +23
The He I infrared (IR) triplet at 10830 Åis known as an activity indicator in solar-type stars and has become a primary diagnostic in exoplanetary transmission spectroscopy. He I l…
The CARMENES search for exoplanets around M dwarfs. The He I infrared triplet lines in PHOENIX models of M2-3 V stars
D. Hintz, B. Fuhrmeister, S. Czesla +25
The He I infrared (IR) line at a vacuum wavelength of 10833 A is a diagnostic for the investigation of atmospheres of stars and planets orbiting them. For the first time, we study…
The CARMENES search for exoplanets around M dwarfs. The He I triplet at 10830 across the M dwarf sequence
B. Fuhrmeister, S. Czesla, L. Hildebrandt +24
The He I infrared (IR) triplet at 10830 AA is an important activity indicator for the Sun and in solar-type stars, however, it has rarely been studied in relation to M dwarfs to da…
The CARMENES search for exoplanets around M dwarfs -- Photospheric parameters of target stars from high-resolution spectroscopy. II. Simultaneous multiwavelength range modeling of activity insensitive lines
V. M. Passegger, A. Schweitzer, D. Shulyak +25
We present precise photospheric parameters of 282 M dwarfs determined from fitting the most recent version of PHOENIX models to high-resolution CARMENES spectra in the visible (0.5…
The CARMENES search for exoplanets around M dwarfs: Different roads to radii and masses of the target stars
Andreas Schweitzer, V. M. Passegger, C. Cifuentes +28
We determine the radii and masses of 293 nearby, bright M dwarfs of the CARMENES survey. This is the first time that such a large and homogeneous high-resolution (R>80 000) spectro…
The CARMENES search for exoplanets around M dwarfs. Chromospheric modeling of M2-3 V stars with PHOENIX
D. Hintz, B. Fuhrmeister, S. Czesla +26
Chromospheric modeling of observed differences in stellar activity lines is imperative to fully understand the upper atmospheres of late-type stars. We present one-dimensional para…
The CARMENES search for exoplanets around M dwarfs. Period search in H, Na I D, and Ca II IRT lines
B. Fuhrmeister, S. Czesla, J. H. M. M. Schmitt +20
We use spectra from CARMENES, the Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Echelle Spectrographs, to search for periods in chro…
The CARMENES search for exoplanets around M dwarfs: Wing asymmetries of H, Na I D, and He I lines
B. Fuhrmeister, S. Czesla, J. H. M. M. Schmitt +13
Stellar activity is ubiquitously encountered in M dwarfs and often characterised by the H line. In the most active M dwarfs, H is found in emission, sometimes with a complex…
The CARMENES search for exoplanets around M dwarfs: High-resolution optical and near-infrared spectroscopy of 324 survey stars
A. Reiners, M. Zechmeister, J. A. Caballero +170
The CARMENES radial velocity (RV) survey is observing 324 M dwarfs to search for any orbiting planets. In this paper, we present the survey sample by publishing one CARMENES spectr…
Transit mapping of a starspot on CoRoT-2 - Probing a stellar surface by planetary transits
U. Wolter, J. H. M. M. Schmitt, K. F. Huber +4
We analyze variations in the transit lightcurves of CoRoT-2b, a massive hot Jupiter orbiting a highly active G star. We use one transit lightcurve to eclipse-map a photospheric spo…