Differential Rotation of CoRoT Stars and a Kepler Binary Star from Starspot Transit Mapping

dc.contributor.authorValio A.
dc.contributor.authorAraujo A.
dc.contributor.authorMenezes F.
dc.date.accessioned2024-10-01T06:10:24Z
dc.date.available2024-10-01T06:10:24Z
dc.date.issued2024
dc.description.abstract© 2024. The Author(s). Published by the American Astronomical Society.While direct magnetic field measurements are rare for slowly rotating stars, spots observed during planetary transits provide a potential indicator of magnetic activity on stellar surfaces. Moreover, the rotation of the stellar surface can be probed by monitoring the spots’ position with time in subsequent transits. This study investigates the dynamic interplay of rotational shear and stellar rotation rate in six stars of spectral types F to M, all hosting exoplanets observed by the CoRoT space mission, except for one binary star from Kepler. The analysis, facilitated by the ECLIPSE code, unveils the physical properties of stellar spots, including radius, intensity, temperature, and position. The five CoRoT stars exhibit spot characteristics consistent with those observed in solar type stars. The determination of a spot longitude during different transits allows for the inference of the star’s differential rotation profile, revealing a decreasing trend of rotational shear with the mean stellar rotation period, given by Δ Ω ∝ P ¯ − 0.9 . This implies that, at least for slow rotators (mean rotation period >5 days), as stars age, their differential rotation decreases. Additionally, the six stars analyzed here seem to fall into two categories, according to their spot flux deficit: those with ΔF spot > 0.005 and those with ΔF spot < 0.002.
dc.description.issuenumber1
dc.description.volume972
dc.identifier.doi10.3847/1538-4357/ad66cb
dc.identifier.issnNone
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/39467
dc.relation.ispartofAstrophysical Journal
dc.rightsAcesso Aberto
dc.titleDifferential Rotation of CoRoT Stars and a Kepler Binary Star from Starspot Transit Mapping
dc.typeArtigo
local.scopus.citations1
local.scopus.eid2-s2.0-85202549361
local.scopus.updated2024-12-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85202549361&origin=inward
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