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The detailed chemical composition of the terrestrial planet host Kepler-10
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia..
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia..
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia..
Univ Texas Austin, McDonald Observ, 2515 Speedway, Austin, TX 78712 USA.;Univ Texas Austin, Dept Astron, 2515 Speedway, Austin, TX 78712 USA..
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2016 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 456, no 3, 2636-2646 p.Article in journal (Refereed) Published
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Abstract [en]

Chemical abundance studies of the Sun and solar twins have demonstrated that the solar composition of refractory elements is depleted when compared to volatile elements, which could be due to the formation of terrestrial planets. In order to further examine this scenario, we conducted a line-by-line differential chemical abundance analysis of the terrestrial planet host Kepler-10 and 14 of its stellar twins. Stellar parameters and elemental abundances of Kepler-10 and its stellar twins were obtained with very high precision using a strictly differential analysis of high quality Canada-France-Hawaii Telescope, Hobby-Eberly Telescope and Magellan spectra. When compared to the majority of thick disc twins, Kepler-10 shows a depletion in the refractory elements relative to the volatile elements, which could be due to the formation of terrestrial planets in the Kepler-10 system. The average abundance pattern corresponds to similar to 13 Earth masses, while the two known planets in Kepler-10 system have a combined similar to 20 Earth masses. For two of the eight thick disc twins, however, no depletion patterns are found. Although our results demonstrate that several factors [e.g. planet signature, stellar age, stellar birth location and Galactic chemical evolution (GCE)] could lead to or affect abundance trends with condensation temperature, we find that the trends give further support for the planetary signature hypothesis.

Place, publisher, year, edition, pages
2016. Vol. 456, no 3, 2636-2646 p.
Keyword [en]
planets and satellites: formation, planets and satellites: terrestrial planets, stars: abundances, stars: individual: Kepler-10
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-283787DOI: 10.1093/mnras/stv2821ISI: 000372265200026OAI: oai:DiVA.org:uu-283787DiVA: diva2:919605
Funder
Knut and Alice Wallenberg Foundation
Available from: 2016-04-14 Created: 2016-04-14 Last updated: 2017-11-30Bibliographically approved

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Gustafsson, Bengt

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