Photometric variations from stellar activity as an age indicator for solar-twins

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dc.contributor.authorPonte G.
dc.contributor.authorLorenzo-Oliveira D.
dc.contributor.authorMelendez J.
dc.contributor.authorGalarza J.Y.
dc.contributor.authorValio A.
dc.date.accessioned2024-03-12T19:09:23Z
dc.date.available2024-03-12T19:09:23Z
dc.date.issued2023
dc.description.abstract© 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.Stellar ages are elusive to measure, albeit being very important for understanding stellar evolution. We investigate the impact of photospheric activity on 2-min cadence light curves from the TESS/NASA mission of a selected sample of 30 solar-twins with well-determined ages. The photometric variability, ATESS, of the light curves due to rotational modulations by the presence of active regions was estimated and correlated with chromospheric activity (Ca II H&K lines from an extensive High Accuracy Radial velocity Planet Searcher (HARPS) at the European Southern Observatory (ESO) HARPS/ESO activity time series) and ages. Moreover, these results were compared with the total solar irradiance amplitude behaviour during the solar magnetic cycles 23 and 24, validating our findings for solar-twins. Our results show the photometric amplitude to be strongly correlated to the average level of chromospheric activity for the star sample. Also, we found a good correlation of AT ESS with stellar age (in Gyr) described by log t = +12.239 − 0.894 log ATESS. In conclusion, stellar photometric variability ATESS may be used as a simple age diagnostic for solar-twins.
dc.description.firstpage2675
dc.description.issuenumber2
dc.description.lastpage2682
dc.description.volume522
dc.identifier.doi10.1093/mnras/stad1085
dc.identifier.issn1365-2966
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/34065
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsAcesso Restrito
dc.subject.otherlanguagestars: activity
dc.subject.otherlanguagestars: solar-type
dc.subject.otherlanguagetechniques: photometric
dc.subject.otherlanguagetechniques: spectroscopic
dc.titlePhotometric variations from stellar activity as an age indicator for solar-twins
dc.typeArtigo
local.scopus.citations1
local.scopus.eid2-s2.0-85161107361
local.scopus.subjectChromospheric activity
local.scopus.subjectHigh-accuracy
local.scopus.subjectLight curves
local.scopus.subjectStar: activity
local.scopus.subjectStars: solar types
local.scopus.subjectStellar ages
local.scopus.subjectStellars
local.scopus.subjectTechniques: photometric
local.scopus.subjectTechniques: spectroscopic
local.scopus.updated2024-12-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85161107361&origin=inward
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