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Almenara, J.M.; Díaz, R.F.; Dorn, C.; Bonfils, X.; Udry, S. "Absolute densities in exoplanetary systems: Photodynamical modelling of Kepler-138" (2018) Monthly Notices of the Royal Astronomical Society. 478(1):460-486
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Abstract:

In favourable conditions, the density of transiting planets inmultiple systems can be determined from photometry data alone. Dynamical information can be extracted from light curves, providing modelling is done self-consistently, i.e. using a photodynamical model, which simulates the individual photometric observations instead of the more generally used transit times. We apply this methodology to the Kepler-138 planetary system. The derived planetary bulk densities are a factor of 2 more precise than previous determinations, and we find a discrepancy in the stellar bulk density with respect to a previous study. This leads, in turn, to a discrepancy in the determination of masses and radii of the star and the planets. In particular, we find that interior planet, Kepler-138b, has a size in between Mars and the Earth. Given our mass and density estimates, we characterize the planetary interiors using a generalized Bayesian inference model. This model allows us to quantify for interior degeneracy and calculate confidence regions of interior parameters such as thicknesses of the core, the mantle, and ocean and gas layers. We find that Kepler-138b and Kepler-138 d have significantly thick volatile layers and that the gas layer of Kepler-138b is likely enriched. On the other hand, Kepler-138c can be purely rocky. © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.

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Documento: Artículo
Título:Absolute densities in exoplanetary systems: Photodynamical modelling of Kepler-138
Autor:Almenara, J.M.; Díaz, R.F.; Dorn, C.; Bonfils, X.; Udry, S.
Filiación:Observatoire de Genève, Dèpartement d'Astronomie, Université de Genève, Chemin des Maillettes 51, Versoix, CH-1290, Switzerland
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires, 1428, Argentina
CONICET - Universidad de Buenos Aires, Instituto de Astronomía y Física del Espacio (IAFE), Buenos Aires, 1428, Argentina
University of Zürich, Institut of computational sciences, Winterthurerstrasse 190, Zürich, CH-8057, Switzerland
University Grenoble Alpes, CNRS, IPAG, Grenoble, F-38000, France
Palabras clave:Planetary systems; Planets and satellites: Interiors; Stars: Fundamental parameters
Año:2018
Volumen:478
Número:1
Página de inicio:460
Página de fin:486
DOI: http://dx.doi.org/10.1093/mnras/sty1050
Título revista:Monthly Notices of the Royal Astronomical Society
Título revista abreviado:Mon. Not. R. Astron. Soc.
ISSN:00358711
CODEN:MNRAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v478_n1_p460_Almenara

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Citas:

---------- APA ----------
Almenara, J.M., Díaz, R.F., Dorn, C., Bonfils, X. & Udry, S. (2018) . Absolute densities in exoplanetary systems: Photodynamical modelling of Kepler-138. Monthly Notices of the Royal Astronomical Society, 478(1), 460-486.
http://dx.doi.org/10.1093/mnras/sty1050
---------- CHICAGO ----------
Almenara, J.M., Díaz, R.F., Dorn, C., Bonfils, X., Udry, S. "Absolute densities in exoplanetary systems: Photodynamical modelling of Kepler-138" . Monthly Notices of the Royal Astronomical Society 478, no. 1 (2018) : 460-486.
http://dx.doi.org/10.1093/mnras/sty1050
---------- MLA ----------
Almenara, J.M., Díaz, R.F., Dorn, C., Bonfils, X., Udry, S. "Absolute densities in exoplanetary systems: Photodynamical modelling of Kepler-138" . Monthly Notices of the Royal Astronomical Society, vol. 478, no. 1, 2018, pp. 460-486.
http://dx.doi.org/10.1093/mnras/sty1050
---------- VANCOUVER ----------
Almenara, J.M., Díaz, R.F., Dorn, C., Bonfils, X., Udry, S. Absolute densities in exoplanetary systems: Photodynamical modelling of Kepler-138. Mon. Not. R. Astron. Soc. 2018;478(1):460-486.
http://dx.doi.org/10.1093/mnras/sty1050