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Stellar and Planetary Characterization of the Ross 128 Exoplanetary System from APOGEE Spectra
Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil..ORCID iD: 0000-0002-7883-5425
Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA..ORCID iD: 0000-0001-8991-3110
Natl Opt Astron Observ, 950 North Cherry Ave, Tucson, AZ 85719 USA..
Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil.;Univ Arizona, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA..
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2018 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 860, no 1, article id L15Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2018. Vol. 860, no 1, article id L15
Keywords [en]
Star: abundances, infrared: stars, planet-star interactions, planetary systems, stars: fundamental parameters, stars: low-mass
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:mau:diva-65206DOI: 10.3847/2041-8213/aac896ISI: 000435372000004Scopus ID: 2-s2.0-85049052764OAI: oai:DiVA.org:mau-65206DiVA, id: diva2:1829611
Available from: 2024-01-19 Created: 2024-01-19 Last updated: 2024-01-19Bibliographically approved

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Jönsson, Henrik

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Souto, DiogoUnterborn, Cayman T.Teske, JohannaCovey, KevinStassun, KeivanZamora, OlgaMasseron, ThomasJönsson, HenrikGilhool, StevenBlake, Cullen
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Astrophysical Journal Letters
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