Kepler-11 is a Solar Twin : Revising the Masses and Radii of Benchmark Planets via Precise Stellar Characterization

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.

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
planets and satellites: fundamental parameters
stars: abundances
stars: fundamental parameters
techniques: spectroscopic

Bean, Jacob L.University of Chicago (author)
Meléndez, JorgeUniversity of São Paulo (author)
Mills, Sean M.University of Chicago (author)
Fabrycky, Daniel C.University of Chicago (author)
Freitas, Fabrício C.University of São Paulo (author)
Ramírez, IvanUniversity of Texas (author)
Asplund, MartinAustralian National University (author)
Liu, FanLund 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,Australian National University(Swepub:lu)fa0858li (author)
Yong, DavidAustralian National University (author)
University of ChicagoUniversity of São Paulo (creator_code:org_t)

By the author/editor: Bedell, Megan; Bean, Jacob L.; Meléndez, Jorge; Mills, Sean M.; Fabrycky, Daniel ...; Freitas, Fabríci ...; show more...; Ramírez, Ivan; Asplund, Martin; Liu, Fan; Yong, David; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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