Explanipedia

Chemical Abundances of M and G Dwarfs in the Hyades and Coma Berenices Open Clusters from APOGEE Spectra Open

Deusalete Vilar, Diogo Souto, Kátia Cunha, Anderson andrade-silva, V. Loaiza-Tacuri , et al. · 2025

Open clusters are one of the best astrophysical laboratories we have available for stellar astrophysics studies. This work presents metallicities and individual abundances for 14 M dwarfs and six G dwarfs from two well-known open clusters:…

An Analysis of the Radius Gap in a Sample of Kepler, K2, and TESS Exoplanets Orbiting M-dwarf Stars Open

Fábio Wanderley, Kátia Cunha, Verne V. Smith, Diogo Souto, Ilaria Pascucci , et al. · 2025

Planetary radii are derived for 218 exoplanets orbiting 161 M dwarf stars. Stellar radii are based on an analysis of APOGEE high-resolution near-IR spectra for a subsample of the M dwarfs; these results are used to define a stellar radius-…

Stellar characterization, Magnesium Abundances and Chromospheric Activity Analysis of Stars with Confirmed Exoplanets from the K2 mission Open

V. Loaiza-Tacuri, Diogo Souto, F. Quispe-Huaynasi, Kátia Cunha, S. Daflon , et al. · 2025

We present a homogeneous spectroscopic analysis of confirmed K2 mission exoplanet-hosting stars, comprising 301 targets with high-resolution optical spectra from HIRES and TRES taken from ExoFOP. We derived effective temperatures, surface …

The Importance of Standardizing Spectra in the Era of Large Spectroscopic Surveys: A Case Study of M Dwarfs in SDSS-V Open

Ilija Medan, Z. Way, Bárbara Rojas-Ayala, Guy S. Stringfellow, Conor Sayres , et al. · 2025

SDSS-V will obtain 100,000s of medium-resolution, optical spectra of M dwarfs with the BOSS instrument. M dwarfs have complex atmospheres, and their spectra contain many wide and dense, overlapping molecular features, so determining accura…

Chemical Abundances of M and G Dwarfs in the Hyades and Coma Berenices Open Clusters from APOGEE Spectra Open

Deusalete Vilar, Diogo Souto, Kátia Cunha, Anderson andrade-silva, Veronica Loaiza-Tucuri , et al. · 2025

Open clusters are one of the best astrophysical laboratories we have available for stellar astrophysics studies. This work presents metallicities and individual abundances for fourteen M dwarfs and six G dwarfs from two well-known open clu…

Metallicities of M Dwarf Planet Host Stars from Kepler, K2, and TESS Observed by APOGEE: Trends with Exoplanetary Radii and Orbital Periods Open

Fábio Wanderley, Kátia Cunha, Diogo Souto, Verne V. Smith, S. Daflon · 2025

One important property in studying the exoplanet population is the host star metallicity ([M/H]). In this study, we derived stellar metallicities and oxygen abundances for 48 M dwarf stars using the near-infrared high-resolution spectra fr…

Abundances of P, S, and K in 58 bulge spheroid stars from APOGEE Open

B. Barbuy, H. Ernandes, A.C.S. Fria̧ ca, Mônica Sartori de Camargo, Patricia Siqueira Silva , et al. · 2025

Context . We have previously studied several elements in 58 selected bulge spheroid stars, based on spectral lines in the H band. We now derive the abundances of the less studied elements phosphorus (P; Z=15), sulphur (S; Z=16), and potass…

Abundances of P, S, and K in 58 bulge spheroid stars from APOGEE Open

B. Barbuy, H. Ernandes, A. C. S. Friaça, Mônica Sartori de Camargo, Patricia Siqueira Silva , et al. · 2025

We have previously studied several elements in 58 selected bulge spheroid stars, based on spectral lines in the H-band. We now derive the abundances of the less-studied elements phosphorus (P; Z=15), sulphur (S; Z=16), and potassium (K; Z=…

Open cluster members in APOGEE DR17 Open

Rafael Guerço, Diogo Souto, José G. Fernández-Trincado, S. Daflon, Kátia Cunha , et al. · 2025

Context . Open clusters (OCs) are groups of stars formed from the same cloud of gas and cosmic dust. They play an important role in studies of star formation and evolution and our understanding of galaxy structure and dynamics. Aims . The …

Reconstructing the Milky Way chemical map with the galactic chemical evolution tool OMEGA+ from SDSS-MWM Open

V. Hegedűs, Szabolcs Mészáros, Blanka Világos, M. Pignatari, Emily J. Griffith , et al. · 2025

Context. Although current observations indicate that there are two distinct sequences of disk stars in the [ α /M] versus [M/H] parameter space, further complexity is evident in the chemical makeup of the Milky Way and consequently suggest…

Performance of the <i>Stellar Abundances and atmospheric Parameters Pipeline</i> adapted for M dwarfs Open

Terese Olander, Matthew R. Gent, U. Heiter, O. Kochukhov, M. Bergemann , et al. · 2025

Context. M dwarfs are important targets in the search for Earth-like exoplanets due to their small masses and low luminosities. Several ongoing and upcoming space missions are targeting M dwarfs for this reason, and the ESA P LATO mission …

A Data-driven M Dwarf Model and Detailed Abundances for ∼17,000 M Dwarfs in SDSS-V Open

Aida Behmard, Melissa Ness, Andrew R. Casey, Ruth Angus, Kátia Cunha , et al. · 2025

The cool temperatures of M dwarf atmospheres enable complex molecular chemistry, making robust characterization of M dwarf compositions a long-standing challenge. Recent modifications to spectral synthesis pipelines have enabled more accur…

Performance of the Stellar Abundances and atmospheric Parameters Pipeline adapted for M dwarfs I. Atmospheric parameters from the spectroscopic module Open

Terese Olander, Matthew R. Gent, U. Heiter, O. Kochukhov, M. Bergemann , et al. · 2025

M dwarfs are important targets in the search for Earth-like exoplanets due to their small masses and low luminosities. Several ongoing and upcoming space missions are targeting M dwarfs for this reason, and the ESA PLATO mission is one of …

A Data-Driven M Dwarf Model and Detailed Abundances for $\sim$17,000 M Dwarfs in SDSS-V Open

Aida Behmard, Melissa Ness, Andrew R. Casey, Ruth Angus, Kátia Cunha , et al. · 2025

The cool temperatures of M dwarf atmospheres enable complex molecular chemistry, making robust characterization of M dwarf compositions a long-standing challenge. Recent modifications to spectral synthesis pipelines have enabled more accur…

ANÁLISE DO COMPORTAMENTO REOLÓGICO DE FLUIDOS DE PERFURAÇÃO COMPOSTOS POR MISTURA DE ARGILAS NATURAIS CHOCOLATE E CHOCOBOFE MODIFICADAS COM CARBONATO DE SÓDIO E VISCOSIFICANTES POLIMÉRICOS Open

Luís Silva, Jayslla Leticia dos Santos Silva, Mariana Isabella Brito Cajá, Sophia Barbosa Silva, Diogo Souto · 2025

Magnetic Fields in a Sample of Planet-hosting M Dwarf Stars from Kepler, K2, and TESS Observed by APOGEE Open

Fábio Wanderley, Kátia Cunha, Verne V. Smith, O. Kochukhov, Diogo Souto , et al. · 2024

Stellar magnetic fields have a major impact on space weather around exoplanets orbiting low-mass stars. From an analysis of Zeeman-broadened Fe i lines measured in near-infrared SDSS/APOGEE spectra, mean magnetic fields are determined for …

A Comprehensive Study of Open Cluster Chemical Homogeneity Using APOGEE and Milky Way Mapper Abundances Open

Amaya Sinha, Gail Zasowski, Peter M. Frinchaboy, Kátia Cunha, Diogo Souto , et al. · 2024

Stars in an open cluster are assumed to have formed from a broadly homogeneous distribution of gas, implying that they should be chemically homogeneous. Quantifying the level to which open clusters are chemically homogeneous can therefore …

Abundances of iron-peak elements in 58 bulge spheroid stars from APOGEE Open

B. Barbuy, A. C. S. Friaça, H. Ernandes, Patricia Siqueira Silva, S. O. Souza , et al. · 2024

Context. Stars presently identified in the bulge spheroid are probably very old, and their abundances can be interpreted as due to the fast chemical enrichment of the early Galactic bulge. The abundances of the iron-peak elements are impor…

Abundances of iron-peak elements in 58 bulge spheroid stars from APOGEE Open

B. Barbuy, A. C. S. Friaça, H. Ernandes, Patricia Siqueira Silva, S. O. Souza , et al. · 2024

Stars presently identified in the bulge spheroid are probably very old, and their abundances can be interpreted as due to the fast chemical enrichment of the early Galactic bulge. The abundances of the iron-peak elements are important trac…

Chemical abundances for a sample of FGK dwarfs in the Pleiades open cluster from APOGEE Open

Vinicius Grilo, Diogo Souto, Kátia Cunha, Rafael Guerço, R. G. Vieira , et al. · 2024

This paper presents chemical abundances of 12 elements (C, Na, Mg, Al, Si, K, Ca, Ti, V, Cr, Mn, and Fe) for 80 FGK dwarfs in the Pleiades open cluster, which span a temperature range of $\sim$2000 K in T$_{\rm eff}$, using the high-resolu…

Chemical Abundances for a Sample of FGK dwarfs in the Pleiades Open Cluster from APOGEE Open

Vinicius Grilo, Diogo Souto, Kátia Cunha, Rafael Guerço, R. G. Vieira , et al. · 2024

This paper presents chemical abundances of twelve elements (C, Na, Mg, Al, Si, K, Ca, Ti, V, Cr, Mn, and Fe) for 80 FGK dwarfs in the Pleiades open cluster, which span a temperature range of $\sim$2000 K in T$_{\rm eff}$, using the high-re…

Stellar Characterization and Chemical Abundances of Exoplanet-hosting M Dwarfs from APOGEE Spectra: Future JWST Targets Open

Edypo Melo, Diogo Souto, Kátia Cunha, Verne V. Smith, Fábio Wanderley , et al. · 2024

Exoplanets hosting M dwarfs are the best targets to characterize Earth-like or super-Earth planetary atmospheres with the James Webb Space Telescope (JWST). We determine detailed stellar parameters ( T eff , log g , and ξ ) and individual …

Magnetic Fields in a sample of planet-hosting M dwarf stars from Kepler, K2, and TESS observed by APOGEE Open

Fábio Wanderley, Kátia Cunha, Verne V. Smith, O. Kochukhov, Diogo Souto , et al. · 2024

Stellar magnetic fields have a major impact on space weather around exoplanets orbiting low-mass stars. From an analysis of Zeeman-broadened Fe I lines measured in near-infrared SDSS/APOGEE spectra, mean magnetic fields are determined for …

A Comprehensive Study of Open Cluster Chemical Homogeneity using APOGEE and Milky Way Mapper Abundances Open

Amaya Sinha, Gail Zasowski, Peter M. Frinchaboy, Kátia Cunha, Diogo Souto , et al. · 2024

Stars in an open cluster are assumed to have formed from a broadly homogeneous distribution of gas, implying that they should be chemically homogeneous. Quantifying the level to which open clusters are chemically homogeneous can therefore …

High-resolution Elemental Abundance Measurements of Cool JWST Planet Hosts Using AutoSpecFit: An Application to the Sub-Neptune K2-18b’s Host M Dwarf Open

Neda Hejazi, Ian J. M. Crossfield, Diogo Souto, Jonathan Brande, Thomas Nordlander , et al. · 2024

We present an in-depth, high-resolution spectroscopic analysis of the M dwarf K2-18, which hosts a sub-Neptune exoplanet in its habitable zone. We show our technique to accurately normalize the observed spectrum, which is crucial for a pro…

Magnetic Fields in M-dwarf Members of the Pleiades Open Cluster Using APOGEE Spectra Open

Fábio Wanderley, Kátia Cunha, O. Kochukhov, Verne V. Smith, Diogo Souto , et al. · 2024

Average magnetic field measurements are presented for 62 M-dwarf members of the Pleiades open cluster, derived from Zeeman-enhanced Fe i lines in the H band. A Markov Chain Monte Carlo methodology was employed to model magnetic filling fac…

High-resolution Elemental Abundance Measurements of Cool JWST Planet Hosts Using AutoSpecFit: An Application to the Sub-Neptune K2-18b's Host M dwarf Open

Neda Hejazi, Ian J. M. Crossfield, Diogo Souto, Jonathan Brande, Thomas Nordlander , et al. · 2024

We present an in-depth, high-resolution spectroscopic analysis of the M dwarf K2-18 that hosts a sub-Neptune exoplanet in its habitable zone. We show our technique to accurately normalize the observed spectrum, which is crucial for a prope…

Stellar Characterization and Chemical Abundances of Exoplanet Hosting M dwarfs from APOGEE Spectra: Future JWST Targets Open

Edypo Melo, Diogo Souto, Kátia Cunha, Verne V. Smith, Fábio Wanderley , et al. · 2024

Exoplanets hosting M dwarfs are the best targets to characterize Earth-like or super-Earth planetary atmospheres with the James Webb Space Telescope (JWST). We determine detailed stellar parameters ($T_{\rm eff}$, log$g$, and $ξ$) and indi…

A Perspective on the Milky Way Bulge Bar as Seen from the Neutron-capture Elements Cerium and Neodymium with APOGEE Open

J. V. Sales-Silva, Kátia Cunha, Verne V. Smith, S. Daflon, Diogo Souto , et al. · 2024

This study probes the chemical abundances of the neutron-capture elements cerium and neodymium in the inner Milky Way from an analysis of a sample of ∼2000 stars in the Galactic bulge bar spatially contained within ∣ X Gal ∣ < 5 kpc, ∣ Y G…

A perspective on the Milky Way Bulge-Bar as seen from the neutron-capture elements Cerium and Neodymium with APOGEE Open

J. V. Sales-Silva, Kátia Cunha, Verne V. Smith, S. Daflon, Diogo Souto , et al. · 2024

This study probes the chemical abundances of the neutron-capture elements cerium and neodymium in the inner Milky Way from an analysis of a sample of $\sim$2000 stars in the Galactic Bulge/bar spatially contained within $|X_{Gal}|<$5 kpc, …

Diogo Souto YOU? Author Swipe