A5057827701- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Computational Physics and Python Applications
- Genetics, Bioinformatics, and Biomedical Research
- Scientific Research and Discoveries
- Calibration and Measurement Techniques
Aarhus University Hospital
2020-2024
Universidade do Porto
2015-2020
Institute of Astrophysics and Space Sciences
2015-2020
Context. Analysis of the statistical properties exoplanets, together with those their host stars, are providing a unique view into process planet formation and evolution.
Context: Exoplanets have now been proven to be very common. The number of its detections continues grow following the development better instruments and missions. One key step for understanding these worlds is their characterization, which mostly depend on host stars. Aims:We perform a significant update Stars With ExoplanETs CATalog (SWEET-Cat), unique compilation precise stellar parameters planet-host stars provided exoplanet community. Methods: We made use high-resolution spectra stars,...
Context.Thanks to the importance that star-planet relation has our understanding of planet formation process, precise determination stellar parameters for ever increasing number discovered extrasolar planets is great relevance.Furthermore, are needed fully characterize properties.It thus important continue efforts determine, in most uniform way possible, stars with as new discoveries announced.Aims.In this paper we present atmospheric a sample 50 planets.The results presented catalogue:...
In the era of vast spectroscopic surveys focusing on Galactic stellar populations, astronomers want to exploit large quantity and good quality data derive their atmospheric parameters without losing precision from automatic procedures. this work, we developed a new spectral package, FASMA, estimate (namely effective temperature, surface gravity, metallicity) in fast robust way. This method is suitable for spectra FGK-type stars medium high resolution. The analysis based synthesis technique...
The number of exoplanet detections continues to grow following the development better instruments and missions. Key steps for understanding these worlds comes from their characterization its statistical studies. We explore metallicity-period-mass diagram known exoplanets by using an updated version Stellar parameters stars With ExoplanETs CATalog (SWEET-Cat), a unique compilation precise stellar planet-host provided community. Here we focus on planets with minimum mass below 30 M$_{\oplus}$...
High-resolution spectroscopic studies of solar-type stars have revealed higher iron abundances derived from singly ionized species compared to neutral, violating the ionization equilibrium under assumption local thermodynamic equilibrium. In this work, we investigate overabundances FeII lines reported in our previous work for a sample 451 HARPS solar neighborhood. The surface gravities which emerge balance, appear underestimated K-type stars. order understand behavior, search line list...
Context: Effective temperature, surface gravity, and metallicity are basic spectroscopic stellar parameters necessary to characterize a star or planetary system. Reliable atmospheric for FGK stars have been obtained mostly from methods that relay on high resolution signal-to-noise optical spectroscopy. The advent of new generation near-IR spectrographs opens the possibility using classic with in NIR spectral window. Aims: We aim compile iron line list solar spectrum derive precise...
Effective temperature (Teff), surface gravity (logg), and metallicity ([M/H]) are basic stellar atmospheric parameters necessary to characterize a star.Once these obtained, we can in turn, infer their chemical abundances of various elements conjunction with evolutionary models estimate evolution, i.e., mass radius.In this work, use spectroscopy as powerful tool extract information from atmospheres applied stars spectral type FGK both dwarfs giants.The growing number spectroscopic surveys...
Aims. Obtaining accurate derivations of stellar atmospheric parameters is crucial in the fields and exoplanet characterization. We present upgraded version our computational tool ODUSSEAS with a new reference scale applied to derive T eff [Fe/H] values for M dwarfs. Methods. The dataset consists based on interferometry, derived by applying updated parallaxes. These are related pseudo-equivalent widths (EWs) more than 4000 absorption lines. machine learning Python “scikit learn” package...
Aims: Obtaining accurate derivations of stellar atmospheric parameters is crucial in the fields and exoplanet characterization. We present upgraded version our computational tool ODUSSEAS with a new reference scale applied to derive $T_{\mathrm{eff}}$ [Fe/H] values for M dwarfs. Methods: The dataset consists based on interferometry, derived by applying updated parallaxes. These are related pseudo-equivalent widths (EWs) more than 4000 absorption lines. machine learning Python "scikit learn"...
Next Generation Sequencing (NGS) is increasingly used in clinical diagnostics, largely driven by the success and robustness of Whole Genome (WGS). Whereas updated guidelines exist for how to interpret report on variants that are identified from NGS using bioinformatics pipelines, there a need standardised practices diagnostics ensure consensus, accuracy, reproducibility comparability results. This article presents consensus recommendations developed 13 units taking part Nordic Alliance...
Abstract Current Galactic surveys, including the Gaia mission, rely on efficiency of spectral analysis techniques to provide precise and accurate information (i.e. effective temperature, surface gravity, metallicity, chemical abundances) in shortest computational time. In this work, we present a new package preform complete analyses based synthesis technique (Tsantaki et al. 2017, submitted). We focus deriving atmospheric parameters for FGK-type stars using both high medium resolution...