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

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

(creator_code:org_t)

2017-04-20
2017
English.
In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 839:2

Related links:: http://dx.doi.org/10...; show more...; https://iopscience.i...; https://lup.lub.lu.s...; https://doi.org/10.3...; show less...

Abstract Subject headings

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.

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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