A. Klutsch
A5057736441- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- History and Developments in Astronomy
- Solar and Space Plasma Dynamics
- Space Exploration and Technology
- SAS software applications and methods
- Digital Filter Design and Implementation
- Advanced Control Systems Optimization
- Crystal Structures and Properties
- Advanced Fiber Laser Technologies
- Calibration and Measurement Techniques
- Rare-earth and actinide compounds
- Galaxies: Formation, Evolution, Phenomena
- Porphyrin and Phthalocyanine Chemistry
- Iterative Learning Control Systems
- Molecular Spectroscopy and Structure
- Insect Pest Control Strategies
- Historical Astronomy and Related Studies
University of Tübingen
2019-2021
Osservatorio Astrofisico di Catania
2009-2020
Centro de Astrobiología
2013-2020
Universidad Complutense de Madrid
2009-2019
Université de Strasbourg
2008-2018
Instituto de Astrofísica de Andalucía
2018
Institute of Space Sciences
2018
National Institute for Astrophysics
2014
Institute for Space Astrophysics and Planetology
2014
Centre National de la Recherche Scientifique
2008-2010
The CARMENES radial velocity (RV) survey is observing 324 M dwarfs to search for any orbiting planets. In this paper, we present the sample by publishing one spectrum each dwarf. These spectra cover wavelength range 520--1710nm at a resolution of least $R > 80,000$, and measure its RV, H$\alpha$ emission, projected rotation velocity. We an atlas high-resolution M-dwarf compare atmospheric models. To quantify RV precision that can be achieved in low-mass stars over range, analyze our...
Context. CARMENES is a stabilised, high-resolution, double-channel spectrograph at the 3.5 m Calar Alto telescope. It optimally designed for radial-velocity surveys of M dwarfs with potentially habitable Earth-mass planets. Aims. We prepare list brightest, single in each spectral subtype observable from northern hemisphere, which we will select best planet-hunting targets CARMENES. Methods. In this first paper on preparation our input catalogue, compiled large amount public data and...
Context. Teegarden's Star is the brightest and one of nearest ultra-cool dwarfs in solar neighbourhood. For its late spectral type (M7.0V), star shows relatively little activity a prime target for near-infrared radial velocity surveys such as CARMENES. Aims. As part CARMENES search exoplanets around M dwarfs, we obtained more than 200 radial-velocity measurements analysed them planetary signals. Methods. We find periodic variability velocities Star. also studied photometric to rule out...
Context: The main goal of the CARMENES survey is to find Earth-mass planets around nearby M-dwarf stars. Seven M-dwarfs included in sample had been observed before with HIRES and HARPS either were reported have one short period planetary companion (GJ15A, GJ176, GJ436, GJ536 GJ1148) or are multiple systems (GJ581 GJ876). Aims: We aim report new precise optical radial velocity measurements for these planet hosts test overall capabilities CARMENES. Methods: combined our Doppler those available...
Context. A key science goal of the Gaia-ESO survey (GES) at VLT is to use kinematics low-mass stars in young clusters and star forming regions probe their dynamical histories how they populate field as become unbound. The clustering around massive Wolf-Rayet binary system γ2 Velorum was one first GES targets.
The radial metallicity distribution in the Galactic thin disc represents a crucial constraint for modelling formation and evolution. Open clusters allow us to derive both its evolution over time. In this paper we perform first investigation of present-day based on [Fe/H] determinations late type members pre-main-sequence clusters. Because their youth, these are therefore essential tracing current inter-stellar medium metallicity. We used products Gaia-ESO Survey analysis 12 young regions...
CARMENES (Calar Alto high-Resolution search for M dwarfs with Exo-earths Near-infrared and optical Echelle Spectrographs) is a next-generation instrument the 3.5m telescope at Calar Observatory, built by consortium of eleven Spanish German institutions. The consists two separate échelle spectrographs covering wavelength range from 0.55 μm to 1.7 spectral resolution R = 82, 000, fed fibers Cassegrain focus telescope. Both are housed in temperature-stabilized vacuum tanks, enable long-term 1...
Context. Chemically inhomogeneous populations are observed in most globular clusters, but not open clusters. Cluster mass seems to play a key role the existence of multiple populations.
We show that non-magnetic models for the evolution of pre-main-sequence (PMS) stars *cannot* simultaneously describe colour-magnitude diagram (CMD) and pattern lithium depletion seen in cluster young, low-mass surrounding $\gamma^2$ Velorum. The age 7.5+/-1 Myr inferred from CMD is much younger than implied by strong Li M-dwarfs occurs at redder colours predicted. epoch which a star given mass depletes its surface temperature are both dependent on radius. demonstrate if have radii ~10 per...
We investigated almost 500 stars distributed among 193 binary or multiple systems made of late-F, G-, early-K primaries and late-K M dwarf companion candidates. For all them, we compiled measured coordinates, J-band magnitudes, spectral types, distances, proper motions.With these data, established a sample 192 physically bound systems. In parallel, carried out observations with HERMES/Mercator obtained high resolution spectra for the five secondaries. used automatic StePar code deriving...
We present the first results from follow-up optical observations, both photometric and spectroscopic, of stellar X-ray sources, selected RasTyc sample, resulting cross-correlation ROSAT All-Sky Survey (RASS) TYCHO catalogues. In particular, we report on discovery six late-type binaries, for which obtained good radial velocity curves solved their orbits. performed an automatic spectral classification single-lined double-lined binaries with codes developed by us found two composed...
Aims. We present a detailed study of the two Sun-like stars KIC 7985370 and 7765135, to determine their activity level, spot distribution, differential rotation. Both were previously discovered by us be young observed NASA Kepler mission.
The Gaia-ESO Survey (GES) is a large spectroscopic survey that provides unique opportunity to study the distribution of multiple systems among different populations Galaxy. We aim at detecting binarity/multiplicity for stars targeted by GES from analysis cross-correlation functions (CCFs) spectra with spectral templates. develop method based on computation CCF successive derivatives detect peaks and determine their radial velocities, even when are strongly blended. parameters detection...
We investigate here the lithium content of young low-mass stars in 5~Myr-old star forming region NGC~2264 and its relationship with rotation. combine equivalent width measurements, EW(Li), from Gaia-ESO Survey determination rotational periods CSI~2264 survey. consider only bona fide non accreting cluster members order to minimize uncertainties on EW(Li). report existence a between rotation at an age 5~Myr. The Li-rotation connection is seen over restricted temperature range,...
The design and construction of CARMENES has been presented at previous SPIE conferences. It is a next-generation radial-velocity instrument the 3.5m telescope Calar Alto Observatory, which was built by consortium eleven Spanish German institutions. consists two separate échelle spectrographs covering wavelength range from 0.52 to 1.71μm spec-tral resolution R < 80,000, fed fibers Cassegrain focus telescope. saw "First Light" on Nov 9, 2015. During commissioning initial operation phases, we...
The nearby (distance ~ 350–400 pc), rich Vela OB2 association, includes γ2 Velorum, one of the most massive binaries in solar neighbourhood and an excellent laboratory for investigating formation early evolution young clusters. Recent Gaia-ESO survey observations have led to discovery two kinematically distinct populations (10–15 Myr) cluster immediately surrounding Velorum. Here we analyse results NGC 2547, a 35 Myr located degrees south radial velocity distribution lithium-rich pre-main...
We use the fundamental parameters delivered by GES consortium in first internal data release to select members of $\gamma$ Vel and Cha I among UVES GIRAFFE spectroscopic observations. A total 140 74 were studied. calculated stellar luminosities through spectral energy distributions, while masses derived comparison with evolutionary tracks. The subtraction low-activity slowly rotating templates, which are rotationally broadened match $v\sin i$ targets, enabled us measure equivalent widths...
We report on the first star discovered to host a planet detected by radial velocity (RV) observations obtained within CARMENES survey for exoplanets around M dwarfs. HD 147379 ($V = 8.9$ mag, $M 0.58 \pm 0.08$ M$_{\odot}$), bright M0.0V at distance of 10.7 pc, is found undergo periodic RV variations with semi-amplitude $K 5.1\pm0.4$ m s$^{-1}$ and period $P 86.54\pm0.06$ d. The signal in our data, which were taken between 2016 2017, supported HIRES/Keck that since 2000. are interpreted as...