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Analysis Of Kepler-71 Activity Through Planetary Transit

Published online by Cambridge University Press:  12 September 2017

Eber A. Gusmão ,
Caius L. Selhorst  and
Alexandre S. Oliveira
Eber A. Gusmão
Affiliation:
IP&D - Universidade do Vale do Paraíba - UNIVAP São José dos Campos, SP, Brazil email: [email protected], [email protected]
Caius L. Selhorst
Affiliation:
IP&D - Universidade do Vale do Paraíba - UNIVAP São José dos Campos, SP, Brazil email: [email protected], [email protected] NAT - Núcleo de Astrofísica Teórica - Universidade Cruzeiro do Sul São Paulo, SP, Brazil email: [email protected]
Alexandre S. Oliveira
Affiliation:
IP&D - Universidade do Vale do Paraíba - UNIVAP São José dos Campos, SP, Brazil email: [email protected], [email protected]
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Abstract

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An exoplanet transiting in front of the disk of its parent star may hide a dark starspot causing a detectable change in the light curve, that allows to infer physical characteristics of the spot such as size and intensity. We have analysed the Kepler Space Telescope observations of the star Kepler-71 in order to search for variabilities in 28 transit light curves. Kepler-71 is a star with 0.923 M⊙ and 0.816 R⊙ orbited by the hot Jupiter planet Kepler-71b with radius of 1.0452 RJ. The physical parameters of the starspots are determined by fitting the data with a model that simulates planetary transits and enables the inclusion of spots on the stellar surface with different sizes, intensities, and positions. The results show that Kepler-71 is a very active star, with several spot detections, with a mean value of 6 spots per transit with size 0.6 RP and 0.5 IC, as a function of stellar intensity at disk center (maximum value).

Keywords

Stars: activity - Starspots - Planetary Systems
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S328: Living Around Active Stars , October 2016 , pp. 140 - 142
Copyright
Copyright © International Astronomical Union 2017 

References

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