Estimating stellar rotation from starspot detection during planetary transits

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dc.contributor.authorSilva-Valio A.
dc.date.accessioned2024-03-13T01:38:11Z
dc.date.available2024-03-13T01:38:11Z
dc.date.issued2008
dc.description.abstractA new method for determining the stellar rotation period is proposed here, based on the detection of starspots during transits of an extrasolar planet orbiting its host star. As the planet eclipses the star, it may pass in front of a starspot which will then make itself known through small flux variations in the transit light curve. If we are lucky enough to catch the same spot on two consecutive transits, it is possible to estimate the stellar rotational period. This method is successfully tested on transit simulations on the Sun yielding the correct value for the solar period. By detecting two starspots on more than one transit of HD 209458 observed by the Hubble Space Telescope, it was possible to estimate a period of either 9.9 or 11.4 days for the star, depending on which spot is responsible for the signature in the light curve a few transits later. Comparison with period estimates of HD 209458 reported in the literature indicates that 11.4 days is the most likely stellar rotation period. © 2008. The American Astronomical Society. All rights reserved. Printed in U.S.A.
dc.description.issuenumber2 PART 2
dc.description.volume683
dc.identifier.doi10.1086/591846
dc.identifier.issn1538-4357
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/37555
dc.relation.ispartofAstrophysical Journal
dc.rightsAcesso Aberto
dc.subject.otherlanguagePlanetary systems
dc.subject.otherlanguageStars: rotation
dc.subject.otherlanguageStars: spots
dc.subject.otherlanguageSubject headings: eclipses
dc.titleEstimating stellar rotation from starspot detection during planetary transits
dc.typeArtigo
local.scopus.citations64
local.scopus.eid2-s2.0-67649669604
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=67649669604&origin=inward
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