A5055857347- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- CCD and CMOS Imaging Sensors
- Advanced Measurement and Detection Methods
- Geophysics and Gravity Measurements
- Maternal and Neonatal Healthcare
- Molecular Spectroscopy and Structure
- Astrophysical Phenomena and Observations
- Scientific Research and Discoveries
- Advanced Optical Sensing Technologies
- Male Reproductive Health Studies
- Health, Nursing, Elderly Care
- Marine Bivalve and Aquaculture Studies
- Marine Ecology and Invasive Species
- Pulsars and Gravitational Waves Research
- Marine and Offshore Engineering Studies
- Methane Hydrates and Related Phenomena
- Gamma-ray bursts and supernovae
- Marine Biology and Environmental Chemistry
- Spectroscopy and Laser Applications
- Offshore Engineering and Technologies
University of Aveiro
2022
Centro de Estudos Ambientais e Marinhos
2022
Universidade do Porto
2016-2020
Institute of Astrophysics and Space Sciences
2016-2020
Centre for Astrophysics of the University of Porto
2012-2014
Context . Being the most numerous and oldest stars in galaxy, M dwarfs are objects of great interest for exoplanet searches. The presence molecules their atmosphere complicates our understanding atmospheric properties. But advances have recently been made modeling due to revision solar abundances. Aims We aim determine stellar parameters using high resolution spectra ( R ∼ 90 000) simultaneously visible near-infrared. broad wavelength coverage provide an unique opportunity understand onset...
Aims. The derivation of spectroscopic parameters for M dwarf stars is very important in the fields stellar and exoplanet characterization. goal this work creation an automatic computational tool able to quickly reliably derive T eff [Fe/H] dwarfs using optical spectra obtained by different spectrographs with resolutions. Methods. ODUSSEAS (Observing Dwarfs Using Stellar Spectroscopic Energy-Absorption Shapes) based on measurement pseudo equivalent widths more than 4000 absorption lines use...
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...
M dwarfs are an important source of information when studying and probing the lower end Hertzsprung-Russell (HR) diagram, down to hydrogen-burning limit. Being most numerous oldest stars in galaxy, they carry fundamental on its chemical history. The presence molecules their atmospheres, along with various condensed species, complicates our understanding physical properties thus makes determination stellar parameters more challenging difficult. aim this study is perform a detailed...
The VVV survey has allowed for an unprecedented number of multi-epoch observations the southern Galactic plane. In a recent paper,13 massive young stellar objects(MYSOs) have already been identified within highly variable(\Delta Ks > 1 mag) YSO sample another published work.This study aims to understand general nature variability in MYSOs.We present first systematic large candidate examined data putative driving sources all known Spitzer EGOs and bright 24 \mu m coinciding with peak 870...
We aimed to map the jets and outflows from Serpens South star forming region find an empirical relationship between magnetic field outflow orientation. Near-infrared H2 v=1-0 S(1) 2.122{\mu}m -line imaging of \sim 30'-long filamentary shaped was carried out. K s broadband same used for continuum subraction. Candidate driving sources mapped jets/outflows are identified list known protostars young stars in this region, which derived studies using recent Spitzer Herschel telescope observations....
The ever-growing number of large spectroscopic survey programs has increased the importance fast and reliable methods with which to determine precise stellar parameters. Some these are highly dependent on correct calibrations. goal this work is obtain a new calibration for estimate Teff [Fe/H] wide range spectral types. We used spectra from joint sample 708 stars, compiled 451 FGK dwarfs 257 GK-giant stars. homogeneously determined parameters derive temperature calibrations using set...
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...
The current and next observation seasons will detect hundreds of gravitational waves (GWs) from compact binary systems coalescence at cosmological distances. When combined with independent electromagnetic measurements, the source redshift be known, we able to obtain precise measurements Hubble constant $H_0$ via distance-redshift relation. However, most observed mergers are not expected have counterparts, which prevents a direct measurement. In this scenario, one possibilities is use dark...
Context. Given the rarity of young O star candidates, compact HII regions embedded in dense molecular cores continue to serve as potential sites for peering into details high-mass formation.
We present a new constraint on the Hubble constant ($H_0$) from standard dark siren method using sample of $5$ well-covered gravitational wave (GW) alerts reported during first part fourth LIGO/Virgo/KAGRA observing runs in combination with sirens three runs. Our methodology relies galaxy catalog alone. use full probability density estimation photometric redshifts derived by deep learning DESI Legacy Survey and DELVE catalogs. add constraints binary black hole mergers candidates S231226av,...
Introdução: A gestação é período de mudanças biopsicossociais para a mulher, exige acompanhamento pré-natal prevenir complicações e garantir saúde materno-infantil. participação paterna nesse contexto crucial fortalecer o vínculo afetivo entre pai filho, contribuir com da gestante do bebê, promover equidade gênero no cuidado à saúde. No entanto, inclusão nas consultas ainda representa um desafio os enfermeiros, profissionais linha frente na atenção família. Objetivo: Este estudo visa...
Photometric wide-field surveys are imaging the sky in unprecedented detail. These face a significant challenge efficiently estimating galactic photometric redshifts while accurately quantifying associated uncertainties. In this work, we address by exploring estimation of Probability Density Functions (PDFs) for galaxies across vast area 17,000 square degrees, encompassing objects with median 5$\sigma$ point-source depth $g$ = 24.3, $r$ 23.9, $i$ 23.5, and $z$ 22.8 mag. Our approach uses deep...
Summary The platform PETROBRAS 25 (P-25) is operating at Albacora field, located the northeast portion of Campos Basin, offshore Brazil, about I 10 Km from coast, in a water depth that varies 230 to 1600 m. This unit, originally drilling platform, was converted into production floating system with process capacity 100,000 bpd oil and 3,000,000 m3/d gas, P-25 moored 520 m, receiving 13 satellite wells 2 diverless subsea manifolds (MSPDL-I e MSPDL-2), 8 each. These were considered deepest...
We present a new spectroscopic calibration for fast estimate of Teff and [Fe/H] FGK dwarfs GK giant stars. used spectra from joint sample 708 stars, composed by 451 257 GK-giant stars with homogeneously determined stellar parameters. have derived 322 EW line-ratios 100 FeI lines that can be to compute [Fe/H], respectively. show these calibrations are effective in the following ranges: 4500 K < 6500 K, 2.5 log g 4.9 dex, –0.8 0:5 dex. The has standard deviation 74 0.07 dex [Fe/H]. use four...
Biofouling communities are broadly distributed and there is a growing need to understand, monitor, prevent their dispersal colonization. Ascidians major group of fouling organisms but have remained poorly studied in this context. Furthermore, the search for improved sustainable practices regarding shipping networks, biofouling management, treatments, monitorization has made headway rapidly. The present study surveyed established baseline ascidian community coastal lagoon, by operationalizing...
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...