M. Tsantaki
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View article: Survey of Surveys
Survey of Surveys Open
Context . In the current panorama of large surveys, the vast amount of data that are obtained with different methods, data types, formats, and stellar samples prevents an efficient use of the available information. Aims . The Survey of Sur…
View article: Shaping Galactic habitability: Impact of stellar migration and gas giants
Shaping Galactic habitability: Impact of stellar migration and gas giants Open
In exoplanet research, studies are increasingly focussed on identifying planets that similar in density and habitability potential to our planet, known as Earth analogs. As the number of known rocky exoplanets grows, parallel discussions h…
View article: gr8stars – I. A homogeneous spectroscopic study of bright FGKM dwarfs and a public library of their high-resolution spectra
gr8stars – I. A homogeneous spectroscopic study of bright FGKM dwarfs and a public library of their high-resolution spectra Open
As the fields of stellar and exoplanetary study grow and revolutionary new detection instruments are created, it is imperative that a homogeneous, precise source of stellar parameters is available. This first work of the gr8stars collabora…
View article: gr8stars I: A homogeneous spectroscopic study of bright FGKM dwarfs and a public library of their high-resolution spectra
gr8stars I: A homogeneous spectroscopic study of bright FGKM dwarfs and a public library of their high-resolution spectra Open
As the fields of stellar and exoplanetary study grow and revolutionary new detection instruments are created, it is imperative that a homogeneous, precise source of stellar parameters is available. This first work of the gr8stars collabora…
View article: SpectroTranslator: Deep-neural network algorithm for homogenising spectroscopic parameters
SpectroTranslator: Deep-neural network algorithm for homogenising spectroscopic parameters Open
Context . In modern Galactic astronomy, stellar spectroscopy plays a pivotal role in complementing large photometric and astrometric surveys and enabling deeper insights to be gained into the chemical evolution and chemo-dynamical mechanis…
View article: The survey of surveys: machine learning for stellar parametrization
The survey of surveys: machine learning for stellar parametrization Open
We present a machine learning method to assign stellar parameters (temperature, surface gravity, metallicity) to the photometric data of large photometric surveys such as SDSS and SKYMAPPER. The method makes use of our previous effort in h…
View article: The enigma of Li-rich giants and its relation with temporal variations observed in radial velocity and stellar activity signals
The enigma of Li-rich giants and its relation with temporal variations observed in radial velocity and stellar activity signals Open
Context . Despite the large number of studies focused on the characterisation of Li-rich stars and understanding the mechanisms leading to such enrichment, their origin remains a mystery. Aims . Magnetic activity, particularly the phenomen…
View article: The enigma of Li-rich giants and its relation with temporal variations observed in radial velocity and stellar activity signals
The enigma of Li-rich giants and its relation with temporal variations observed in radial velocity and stellar activity signals Open
Despite the large number of studies focused on the characterisation of Li-rich stars and understanding the mechanisms leading to such enrichment, their origin remains a mystery. Magnetic activity, particularly the phenomena usually associa…
View article: Planets around evolved intermediate-mass stars
Planets around evolved intermediate-mass stars Open
Context. We carried out a long-term campaign spanning 17 year to obtain high-precision radial velocities (RVs) with the HARPS spectrograph for a large sample of evolved stars in open clusters. Aims. The aim of this work is to search for pl…
View article: Search for lithium-rich giants in 32 open clusters with high-resolution spectroscopy
Search for lithium-rich giants in 32 open clusters with high-resolution spectroscopy Open
Context. Lithium-rich giant stars are rare and their existence poses a challenge to our understanding of stellar structure and evolution. In particular, open clusters aptly constrain the mass and age of their members, offering a unique opp…
View article: Search for lithium-rich giants in 32 open clusters with high-resolution spectroscopy
Search for lithium-rich giants in 32 open clusters with high-resolution spectroscopy Open
Lithium-rich giant stars are rare and their existence challenges our understanding of stellar structure and evolution. We profit from the high-quality sample gathered with HARPS and UVES, in order to search for Li-rich giants and to identi…
View article: Ariel stellar characterisation
Ariel stellar characterisation Open
Context. In 2020 the European Space Agency selected Ariel as the next mission to join the space fleet of observatories to study planets outside our Solar System. Ariel will be devoted to the characterisation of 1000 planetary atmospheres i…
View article: Survey of Surveys
Survey of Surveys Open
Context. In the present-day panorama of large spectroscopic surveys, the amount, diversity, and complexity of the available data continuously increase. The overarching goal of studying the formation and evolution of our Galaxy is hampered …
View article: The SAPP pipeline for the determination of stellar abundances and atmospheric parameters of stars in the core program of the PLATO mission
The SAPP pipeline for the determination of stellar abundances and atmospheric parameters of stars in the core program of the PLATO mission Open
We introduce the SAPP (Stellar Abundances and atmospheric Parameters Pipeline), the prototype of the code that will be used to determine parameters of stars observed within the core program of the PLATO space mission. The pipeline is based…
View article: The SAPP pipeline for the determination of stellar abundances and\n atmospheric parameters of stars in the core program of the PLATO mission
The SAPP pipeline for the determination of stellar abundances and\n atmospheric parameters of stars in the core program of the PLATO mission Open
We introduce the SAPP (Stellar Abundances and atmospheric Parameters\nPipeline), the prototype of the code that will be used to determine parameters\nof stars observed within the core program of the PLATO space mission. The\npipeline is ba…
View article: Discovery of a young low-mass brown dwarf transiting a fast-rotating F-type star by the Galactic Plane eXoplanet (GPX) survey
Discovery of a young low-mass brown dwarf transiting a fast-rotating F-type star by the Galactic Plane eXoplanet (GPX) survey Open
\n We announce the discovery of GPX-1 b, a transiting brown dwarf with a mass of 19.7 ± 1.6 MJup and a radius of 1.47 ± 0.10 RJup, the first substellar object discovered by the Galactic Plane eXoplanet (GPX) survey. The brown dwarf transit…
View article: Survey of Surveys I: The largest catalogue of radial velocities for the Galaxy
Survey of Surveys I: The largest catalogue of radial velocities for the Galaxy Open
In the present-day panorama of large spectroscopic surveys, the amount, diversity, and complexity of the available data continuously increase. We present a comprehensive catalogue, the Survey of Surveys (SoS), built by homogeneously mergin…
View article: Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program
Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program Open
Context. To understand the formation and composition of planetary systems, it is essential to have insights into the chemical composition of their host stars. In particular, C/O elemental ratios are useful for constraining the density and …
View article: Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program IV. Carbon and C/O ratios for Galactic stellar populations and planet hosts
Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program IV. Carbon and C/O ratios for Galactic stellar populations and planet hosts Open
[ABRIDGED]We study the carbon abundances with a twofold objective. On the one hand, we want to evaluate the behaviour of carbon in the context of Galactic chemical evolution. On the other hand, we focus on the possible dependence of carbon…
View article: SWEET-Cat 2.0: The Cat just got SWEETer; Higher quality spectra and precise parallaxes from GAIA eDR3
SWEET-Cat 2.0: The Cat just got SWEETer; Higher quality spectra and precise parallaxes from GAIA eDR3 Open
Aims. The catalog of Stars With ExoplanETs (SWEET-Cat) was originally introduced in 2013. Since then many more exoplanets have been confirmed, increasing significantly the number of host stars listed there. A crucial step toward a comprehe…
View article: SWEET-Cat 2.0: The Cat just got SWEETer
SWEET-Cat 2.0: The Cat just got SWEETer Open
Aims. The catalog of Stars With ExoplanETs (SWEET-Cat) was originally introduced in 2013. Since then many more exoplanets have been confirmed, increasing significantly the number of host stars listed there. A crucial step toward a comprehe…
View article: Discovery of a young low-mass brown dwarf transiting a fast-rotating F-type star by the Galactic Plane eXoplanet (GPX) survey
Discovery of a young low-mass brown dwarf transiting a fast-rotating F-type star by the Galactic Plane eXoplanet (GPX) survey Open
We announce the discovery of GPX-1 b, a transiting brown dwarf with a mass of 19.7 ± 1.6 MJup and a radius of 1.47 ± 0.10 RJup, the first substellar object discovered by the Galactic Plane eXoplanet (GPX) survey. The brown dwarf transits a…
View article: FASMA: a python package for stellar parameters and chemical abundances
FASMA: a python package for stellar parameters and chemical abundances Open
Effective temperature, surface gravity, and metallicity are basic stellar parameters necessary to characterize a star. Once these parameters are obtained, we can in turn, infer their chemical abundances of various elements and in conjuncti…
View article: Benchmark stars, benchmark spectrographs
Benchmark stars, benchmark spectrographs Open
Context. Gaia benchmark stars are selected to be calibration stars for different spectroscopic surveys. Very high-quality and homogeneous spectroscopic data for these stars are therefore required. We collected ultrahigh-resolution ESPRESSO…
View article: Benchmark stars, benchmark spectrographs: Detailed spectroscopic comparison of ESPRESSO, PEPSI, and HARPS data for Gaia benchmark stars
Benchmark stars, benchmark spectrographs: Detailed spectroscopic comparison of ESPRESSO, PEPSI, and HARPS data for Gaia benchmark stars Open
Gaia benchmark stars are selected to be calibration stars for different spectroscopic surveys. Very high-quality and homogeneous spectroscopic data for these stars are therefore required. We collected ultrahigh-resolution ESPRESSO spectra …
View article: The Gaia-ESO survey: the non-universality of the age–chemical-clocks–metallicity relations in the Galactic disc⋆⋆⋆
The Gaia-ESO survey: the non-universality of the age–chemical-clocks–metallicity relations in the Galactic disc⋆⋆⋆ Open
Context. In the era of large spectroscopic surveys, massive databases of high-quality spectra coupled with the products of the Gaia satellite provide tools to outline a new picture of our Galaxy. In this framework, an important piece of in…
View article: FASMA 2.0: A Python package for stellar parameters and chemical abundances
FASMA 2.0: A Python package for stellar parameters and chemical abundances Open
Effective temperature (Teff), surface gravity (logg), and metallicity ([M/H]) are basic stellar atmospheric parameters necessary to characterize a star.Once these parameters are obtained, we can in turn, infer their chemical abundances of …
View article: FASMA 2.0: A Python package for stellar parameters and chemical abundances
FASMA 2.0: A Python package for stellar parameters and chemical abundances Open
Stellar spectral analysis package. FASMA delivers the atmospheric stellar parameters (effective temperature, surface gravity, metallicity, microturbulence, macroturbulence, and rotational velocity) based on the spectral synthesis technique…
View article: The <i>Gaia</i>-ESO Survey: a new approach to chemically characterising young open clusters
The <i>Gaia</i>-ESO Survey: a new approach to chemically characterising young open clusters Open
Context. Open clusters are recognised as excellent tracers of Galactic thin-disc properties. At variance with intermediate-age and old open clusters, for which a significant number of studies is now available, clusters younger than ≲150 My…