Kepler-411 Differential Rotation from Three Transiting Planets

Autor(es)

Araujo, Alexandre ^[1] ; Valio, Adriana ^[1]

Afiliação do(s) autor(es)

^[1] Univ Prebiteriana Mackenzie, Ctr Radio Astron & Astrophys Mackenzie, Rua Consolacao 860, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Astrophysical Journal Letters; v. 907, n. 1 JAN 2021.
• Citações Web of Science: 0

Resumo

The differential rotation of the Sun is a crucial ingredient of the dynamo theory responsible for the generation of its magnetic field. Currently, the rotation profile of a star that hosts one or more transiting planet can be estimated. By detecting the same spot in a later transit, it is possible to infer the stellar rotation period at that latitude. In this work, we apply for the first time transit spot mapping to determine the differential rotation of Kepler-411, a K2V-type star with an average rotation period of 10.52 days, a radius of 0.79 R-circle dot, and a mass of 0.83 M-circle dot. Kepler-411 hosts at least four planets, the inner planet is a super-Earth with a radius of 1.88 R-circle plus and an orbital period of 3.0051 days, whereas the two larger transiting planets are mini Neptunes with radii of 3.27 and 3.31 R-circle plus, and periods of 7.834435 and 58.0204 days, respectively. Their orbits are such that they transit the star at latitudes of -11 degrees, -21 degrees, and -49 degrees. Analysis of the transit light curves of the three planets resulted in the detection of a total of 198 spots. For each transit latitude, the rotation period of the star was estimated and the differential rotation pattern estimated independently. Then a solar-like differential rotation profile was fit to the three rotation periods at the distinct latitudes, and the result agreed extremely well with the previous ones, resulting in a differential shear of 0.0500 +/- 0.0006 rd day(-1) or a relative differential rotation of 8.4% +/- 0.1%. (AU)

• Processo FAPESP: 13/10559-5 - Investigação de fenômenos de altas energias e plasmas astrofísicos: teoria, simulações numéricas, observações e desenvolvimento de instrumentação para o Cherenkov Telescope Array (CTA)
• Beneficiário: Elisabete Maria de Gouveia Dal Pino
• Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais