Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/32295
DC Field | Value | Language |
---|---|---|
dc.contributor.author | de Freitas, D. B. | en_US |
dc.contributor.author | LANZA, Antonino Francesco | en_US |
dc.contributor.author | da Silva Gomes, F. O. | en_US |
dc.contributor.author | Das Chagas, M. L. | en_US |
dc.date.accessioned | 2022-06-14T09:44:29Z | - |
dc.date.available | 2022-06-14T09:44:29Z | - |
dc.date.issued | 2021 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/32295 | - |
dc.description.abstract | Kepler-30 is a unique target to study stellar activity and rotation in a young solar-like star accompanied by a compact planetary system. We use about 4 years of high-precision photometry collected by the Kepler mission to investigate the fluctuations caused by photospheric convection, stellar rotation, and starspot evolution as a function of the timescale. Our main goal is to apply methods for the analysis of timeseries to find the timescales of the phenomena that affect the light variations. We correlate those timescales with periodicities in the star as well as in the planetary system. We model the flux rotational modulation induced by active regions using spot modelling and apply the MFDMA in standard and multiscale versions for analysing the behaviour of variability and light fluctuations that can be associated with stellar convection and the evolution of magnetic fields on timescales ranging from less than 1 day up to about 35 days. The light fluctuations produced by stellar activity can be described by the multifractal Hurst index that provides a measure of their persistence. The spot modeling indicates a lower limit to the relative surface differential rotation of $\Delta \Omega/\Omega\sim 0.02\pm 0.01$ and suggests a short-term cyclic variation in the starspot area with a period of $\sim 34$ days, virtually close to the synodic period of 35.2 days of the planet Kepler-30b. By subtracting the two timeseries of the SAP and PDC Kepler pipelines, we reduce the rotational modulation and find a 23.1-day period close to the synodic period of Kepler-30c. This period also appears in the multifractal analysis as a crossover of the fluctuation functions associated with the characteristic evolutionary timescales of the active regions in Kepler-30 as confirmed by spot modelling. These procedures and methods may be greatly useful for analysing current TESS and future PLATO data. | en_US |
dc.language.iso | eng | en_US |
dc.title | Multiscale behaviour of stellar activity and rotation of the planet host Kepler-30 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/202140287 | en_US |
dc.identifier.scopus | 2-s2.0-85107542330 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2021/06/aa40287-21/aa40287-21.html | en_US |
dc.identifier.url | http://arxiv.org/abs/2103.15921v1 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 650 | en_US |
dc.relation.firstpage | A40 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | BRA | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_6 Stars and stellar systems | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Catania | - |
crisitem.author.orcid | 0000-0001-5928-7251 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
2103.15921v1-pt 1.pdf | preprint pt. 1 | 2.14 MB | Adobe PDF | View/Open |
2103.15921v1-pt 2.pdf | preprint pt. 2 | 8.71 MB | Adobe PDF | View/Open |
aa40287-21_1st.pdf | Only the first page | 137.41 kB | Adobe PDF | View/Open |
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