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Differential rotation of stars from spot transit mapping: dependence on rotation period and effective temperature

Published online by Cambridge University Press:  23 December 2024

Alexandre Araújo  and
Adriana Valio Open the ORCID record for Adriana Valio [Opens in a new window]
Alexandre Araújo
Affiliation:
Centre for Radio Astronomy and Astrophysics, Mackenzie Presbyterian University, São Paulo, Brazil
Adriana Valio*
Affiliation:
Centre for Radio Astronomy and Astrophysics, Mackenzie Presbyterian University, São Paulo, Brazil
*
email: adrivalio@gmail.com
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Abstract

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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.

Keywords

StarspotStellar rotationDifferential Rotation
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S365: Dynamics of Solar and Stellar Convection Zones and Atmospheres , December 2023 , pp. 63 - 69
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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