Stellar and planetary characterization of the ross 128 exoplanetary system from APOGEE spectra
Author
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Souto, Diogo
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Unterborn, Cayman T.
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Smith, Verne V.
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Cunha, Katia
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Teske, Johanna
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Covey, Kevin
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Rojas Ayala, Barbara
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García Hernández, D. A.
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Stassun, Keivan
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Zamora, Olga
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Masseron, Thomas
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Johnson, J. A.
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Majewski, Steven R.
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Jonsson, Henrik
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Gilhool, Steven
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Blake, Cullen
Author
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Santana, Felipe
Admission date
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2018-11-21T14:31:00Z
Available date
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2018-11-21T14:31:00Z
Publication date
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2018-06-10
Cita de ítem
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Astrophysical Journal Letters Volumen: 860 Número: 1 Número de artículo: L15
es_ES
Identifier
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10.3847/2041-8213/aac896
Identifier
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https://repositorio.uchile.cl/handle/2250/152765
Abstract
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The first detailed chemical abundance analysis of the M-dwarf (M4.0) exoplanet-hosting star Ross 128 is presented here, based upon near-infrared (1.5-1.7 mu m), high-resolution (R similar to 22,500) spectra from the SDSS Apache Point Galactic Evolution Experiment survey. We determined precise atmospheric parameters T-eff = 3231 +/- 100 K, log g = 4.96 +/- 0.11 dex and chemical abundances of eight elements (C, O, Mg, Al, K, Ca, Ti, and Fe), finding Ross 128 to have near solar metallicity ([Fe/H] = +0.03 +/- 0.09 dex). The derived results were obtained via spectral synthesis (1D LTE) adopting both MARCS and PHOENIX model atmospheres; stellar parameters and chemical abundances derived from the different adopted models do not show significant offsets. Mass-radius modeling of Ross 128b indicates that it lies below the pure-rock composition curve, suggesting that it contains a mixture of rock and iron, with the relative amounts of each set by the ratio of Fe/Mg. If Ross 128b formed with a subsolar Si abundance, and assuming the planet's composition matches that of the host star, it likely has a larger core size relative to the Earth despite this producing a planet with a Si/Mg abundance ratio similar to 34% greater than the Sun. The derived planetary parameters-insolation flux (S-Earth = 1.79 +/- 0.26) and equilibrium temperature (T-eq = 294. +/-. 10 K)-support previous findings that Ross 128b is a temperate exoplanet in the inner edge of the habitable zone.
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Patrocinador
dc.description.sponsorship
National Aeronautics and Space Administration
16-XRP16\_2-0004
NSF
AST-1616636
CONICYT PAI/CONCURSO NACIONAL INSERCION EN LA ACADEMIA, CONVOCATORIA
79150050
Crafoord Foundation
Stiftelsen Olle Engkvist Byggmastare
NASA - Space Telescope Science Institute
HST-HF2-51399.001
NAS5-26555
National Aeronautics and Space Administration
Alfred P. Sloan Foundation
U.S. Department of Energy Office of Science
Center for High-Performance Computing at the University of Utah
Brazilian Participation Group
Carnegie Institution for Science, Carnegie Mellon University
Chilean Participation Group
French Participation Group
Harvard-Smithsonian Center for Astrophysics
Instituto de Astrofisica de Canarias
The Johns Hopkins University
Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo
Lawrence Berkeley National Laboratory
Leibniz Institut fur Astrophysik Potsdam (AIP)
Max-Planck-Institut fur Astronomie (MPIA Heidelberg)
Max-Planck-Institut fur Astrophysik (MPA Garching)
Max-Planck-Institut fur Extraterrestrische Physik (MPE)
National Astronomical Observatory of China
New Mexico State University
New York University
University of Notre Dame
Observatorio Nacional/MCTI
Ohio State University
Pennsylvania State University
Shanghai Astronomical Observatory
United Kingdom Participation Group
Universidad Nacional Autonoma de Mexico
University of Arizona
University of Colorado Boulder
University of Oxford
University of Portsmouth
University of Utah
University of Virginia
University of Washington
University of Wisconsin
Vanderbilt University
Yale University
Spanish Ministry of Economy and Competitiveness (MINECO)
AYA-2017-88254-P