Výsledky vyhledávání - "Marcelo Tucci-Maia"

First observation of a planetary transit with the SPARC4 CCD: improved parameters for HATS-24b

Autor: Eder Martioli, Marcelo Tucci-Maia, Janderson M. Oliveira

The photometric monitoring of planetary transits is an important method for the characterization of exoplanets. Transiting exoplanets allow measurements of the planetary radius and mass, providing information on the physical structure of the planet.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::634575d87695d50921bebbaa3262145c

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The Gaia FGK benchmark stars version 2.1

Autor: Ulrike Heiter, Keith Hawkins, Sergi Blanco-Cuaresma, Paula Jofre, Clare Worley, Caroline Soubiran, Carlos Rodrigo, Marcelo Tucci Maia

Publikováno v: Research Notes of the AAS
Research Notes of the AAS, 2018, 2 (3), pp.id. 152. ⟨10.3847/2515-5172/aadc61⟩

The Gaia FGK benchmark stars are among the preferred samples of reference stars to test parametrisation pipelines of spectroscopic surveys. They consist of a small but carefully selected sample whose parameters are derived consistently and homogeneou

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7af008a7f393536a74d822bcfed92486
http://arxiv.org/abs/1808.09778

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Chemical inhomogeneities in the pleiades: signatures of rocky-forming material in stellar atmospheres

Autor: Andrew R. Casey, Jorge Melendez, Amanda I. Karakas, Lorenzo Spina, Marcelo Tucci-Maia

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

The aim of Galactic archaeology is to recover the history of our Galaxy through the information encoded in stars. An unprobed assumption of this field is that the chemical composition of a star is an immutable marker of the gas from which it formed.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::86b6a8943876af5f330d9cbefa5a4409

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Traits for chemical evolution in solar twins

Autor: Holly Jackson, Marcelo Tucci Maia, Paula Jofre

Publikováno v: Astronomy & Astrophysics. 633:L9

The physical processes driving chemical evolution in the Milky Way can be probed using the distribution of abundances in low-mass FGK type stars in space phase at different times. During their final stages of evolution stars experience nucleosynthesi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::209e53e75b6f176f02af3a0168911eba
https://doi.org/10.1051/0004-6361/201937140

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The Solar Twin Planet Search - V. Close-in, low-mass planet candidates and evidence of planet accretion in the solar twin HIP 68468

Autor: Karin Lind, TalaWanda R. Monroe, Stefan Dreizler, Luca Casagrande, Sylvio Ferraz-Mello, Hong-Liang Yan, Jianrong Shi, Martin Asplund, Jorge Melendez, Lorenzo Spina, Jacob L. Bean, Marcelo Tucci Maia, Jhon Yana Galarza, Ivan Ramirez, Megan Bedell, Alan Alves-Brito, Leonardo A. dos Santos

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

[Methods]. We obtained high-precision radial velocities with HARPS on the ESO 3.6 m telescope and determined precise stellar elemental abundances (~0.01 dex) using MIKE spectra on the Magellan 6.5m telescope. [Results]. Our data indicate the presence

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a6d59eab63819f00911e13a95488c4ea

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Elemental high-precision abundances as function of stellar ages: Constrains on the Galactic chemical evolution

Autor: Marcelo Tucci Maia

Publikováno v: Proceedings of the International Astronomical Union. 13:376-377

Solar twins are a special group of stars that have spectra and stellar parameters very close to the Sun. Also having mass around 1 solar mass and roughly solar chemical composition, these stars follow a similar evolutionary path to the Sun, from the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::27d47db350f10cd6582b7e84bbca9c0c
https://doi.org/10.1017/s174392131700816x

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HIP 10725: The First Solar Twin/Analogue Field Blue Straggler

Autor: Marcelo Tucci Maia, Maria Lugaro, Matthieu Castro, L. M. Howes, José Dias do Nascimento, Martin Asplund, Jorge Melendez, Marcos A. Faria, Lucas Schirbel, David Yong, Ivan Ramirez, Amanda I. Karakas

Publikováno v: Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

[Context]. Blue stragglers are easy to identify in globular clusters, but are much harder to identify in the field. Here we present the serendipitous discovery of one field blue straggler, HIP 10725, that closely matches the Sun in mass and age, but

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::96d1707e875707e9694c202a7cbfd867

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High Precision Abundances of the Old Solar Twin HIP 102152: Insights on Li Depletion from the Oldest Sun

Autor: Fabrício C. Freitas, Luca Casagrande, David Yong, Marcelo Tucci Maia, Ivan Ramirez, Jorge Melendez, Megan Bedell, Martin Asplund, Jacob L. Bean, Maria Bergemann, TalaWanda R. Monroe, José-Dias do Nascimento, Matthieu Castro, Alan Alves-Brito, Michael Bazot, Karin Lind

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

We present the first detailed chemical abundance analysis of the old 8.2 Gyr solar twin, HIP 102152. We derive differential abundances of 21 elements relative to the Sun with precisions as high as 0.004 dex ($\lesssim$1%), using ultra high-resolution

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::daf643f6a36e5bc5656d9834f29771d0

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HIGH PRECISION ABUNDANCES IN THE 16 Cyg BINARY SYSTEM: A SIGNATURE OF THE ROCKY CORE IN THE GIANT PLANET

Autor: Jorge Melendez, Ivan Ramirez, Marcelo Tucci Maia

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

We study the stars of the binary system 16 Cygni to determine with high precision their chemical composition. Knowing that the component B has a detected planet of at least 1.5 Jupiter masses, we investigate if there are chemical peculiarities that c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc6aa3a7ceb804bd6f4c6dec181e3ccc
https://doi.org/10.1088/2041-8205/790/2/l25

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