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Stellar and Planetary Characterization of the Ross 128 Exoplanetary System from APOGEE Spectra

Souto, Diogo (författare)
Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil.,National Observatory Brazil
Unterborn, Cayman T. (författare)
Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA.,Arizona State University
Smith, Verne V. (författare)
Natl Opt Astron Observ, 950 North Cherry Ave, Tucson, AZ 85719 USA.,National Optical Astronomy Observatory
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Cunha, Katia (författare)
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.,National Observatory Brazil,University of Arizona
Teske, Johanna (författare)
Carnegie Inst Sci, Dept Terr Magnetism, 5241 Broad Branch Rd NW, Washington, DC 20015 USA.;Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA.,Carnegie Observatories,Carnegie Institution for Science
Covey, Kevin (författare)
Western Washington Univ, Dept Phys & Astron, Bellingham, WA 98225 USA.,Western Washington University
Rojas-Ayala, Barbara (författare)
Univ Andres Bello, Dept Ciencias Fis, Fernandez Concha 700, Santiago, Chile.,Andrés Bello National University
Garcia-Hernandez, D. A. (författare)
Inst Astrofis Canarias, E-38205 Tenerife, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.,University of La Laguna (ULL),Instituto de Astrofísica de Canarias
Stassun, Keivan (författare)
Vanderbilt Univ, Dept Phys & Astron, 6301 Stevenson Ctr Ln, Nashville, TN 37235 USA.;Fisk Univ, Dept Phys, 1000 17th Ave N, Nashville, TN 37208 USA.,Fisk University,Vanderbilt University
Zamora, Olga (författare)
Inst Astrofis Canarias, E-38205 Tenerife, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.,Instituto de Astrofísica de Canarias,University of La Laguna (ULL)
Masseron, Thomas (författare)
Inst Astrofis Canarias, E-38205 Tenerife, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.,University of La Laguna (ULL),Instituto de Astrofísica de Canarias
Johnson, J. A. (författare)
Ohio State Univ, Dept Astron, 174 W 18Th Ave, Columbus, OH 43210 USA.,Ohio State University
Majewski, Steven R. (författare)
Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA.,University of Virginia
Jönsson, Henrik (författare)
Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
Gilhool, Steven (författare)
Univ Penn, Dept Phys & Astron, 209 S 33rd St, Philadelphia, PA 19104 USA.,University of Pennsylvania
Blake, Cullen (författare)
Univ Penn, Dept Phys & Astron, 209 S 33rd St, Philadelphia, PA 19104 USA.,University of Pennsylvania
Santana, Felipe (författare)
Univ Chile, Av Libertador Bernardo OHiggins 1058, Santiago, Chile.,University of Chile
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Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil National Observatory Brazil (creator_code:org_t)
2018-06-14
2018
Engelska.
Ingår i: Astrophysical Journal Letters. - : Institute of Physics Publishing (IOPP). - 2041-8205 .- 2041-8213. ; 860:1
Relaterad länk:
https://doi.org/10.3...
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https://repository.a...
http://dx.doi.org/10...
https://urn.kb.se/re...
https://doi.org/10.3...
https://lup.lub.lu.s...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • 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.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

Star: abundances
infrared: stars
planet-star interactions
planetary systems
stars: fundamental parameters
stars: low-mass
infrared: stars
planetary systems
planetstar interactions
stars: abundances
stars: fundamental parameters
stars: low-mass

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