Differential rotation of stars from spot transit mapping: dependence on rotation period and effective temperature
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Artigo de evento
Date
2023
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Proceedings of the International Astronomical Union
item.page.citationsscopus
0
Authors
Araujo A.
Valio A.
Valio A.
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Volume Title
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Abstract
© The Author(s), 2024.Just like the Sun, other stars also exhibit differential rotation. Currently, the rotation profile of a star that hosts a transiting planet can be estimated if during a transits, the planet occults a spot on the photosphere of the star, causing slight variations in its light curve. By detecting the same spot during a later transit, the stellar rotation period at that latitude is determined. Here, we present the results of differential rotation for 48 stars, 13 from the spot transit mapping method, while the remaining 35 stars from other techniques. The results show that the differential rotation is correlated with the stellar mean rotation period for fast rotating stars and strongly anti-correlated for slow rotators. The transition occuring at rotation period of 5 days. On the other hand, the differential shear increases with effective temperature for fast rotating stars, but the correlation is lost for the slow rotators.