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Kepler-11 is a Sola...
Kepler-11 is a Solar Twin : Revising the Masses and Radii of Benchmark Planets via Precise Stellar Characterization
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- Bedell, Megan (author)
- University of Chicago
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- Bean, Jacob L. (author)
- University of Chicago
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- Meléndez, Jorge (author)
- University of São Paulo
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- Mills, Sean M. (author)
- University of Chicago
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- Fabrycky, Daniel C. (author)
- University of Chicago
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- Freitas, Fabrício C. (author)
- University of São Paulo
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- Ramírez, Ivan (author)
- University of Texas
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- Asplund, Martin (author)
- Australian National University
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- Liu, Fan (author)
- Lund University,Lunds universitet,Astronomi - Har omorganiserats,Institutionen för astronomi och teoretisk fysik - Har omorganiserats,Naturvetenskapliga fakulteten,Lund Observatory - Has been reorganised,Department of Astronomy and Theoretical Physics - Has been reorganised,Faculty of Science,Australian National University
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- Yong, David (author)
- Australian National University
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(creator_code:org_t)
- 2017-04-20
- 2017
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 839:2
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http://dx.doi.org/10...
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https://iopscience.i...
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https://doi.org/10.3...
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Abstract
Subject headings
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- The six planets of the Kepler-11 system are the archetypal example of a population of surprisingly low-density transiting planets revealed by the Kepler mission. We have determined the fundamental parameters and chemical composition of the Kepler-11 host star to unprecedented precision using an extremely high-quality spectrum from Keck-HIRES (R ≃ 67,000, S/N per pixel at 600 nm). Contrary to previously published results, our spectroscopic constraints indicate that Kepler-11 is a young main-sequence solar twin. The revised stellar parameters and new analysis raise the densities of the Kepler-11 planets by between 20% and 95% per planet, making them more typical of the emerging class of "puffy" close-in exoplanets. We obtain photospheric abundances of 22 elements and find that Kepler-11 has an abundance pattern similar to that of the Sun with a slightly higher overall metallicity. We additionally analyze the Kepler light curves using a photodynamical model and discuss the tension between spectroscopic and transit/TTV-based estimates of stellar density.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- planets and satellites: fundamental parameters
- stars: abundances
- stars: fundamental parameters
- techniques: spectroscopic
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Bedell, Megan
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Bean, Jacob L.
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Meléndez, Jorge
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Mills, Sean M.
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Fabrycky, Daniel ...
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Freitas, Fabríci ...
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show more...
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Ramírez, Ivan
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Asplund, Martin
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Liu, Fan
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Yong, David
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
- Articles in the publication
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Astrophysical Jo ...
- By the university
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Lund University