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dc.contributor.author
Flores, Matias G.
dc.contributor.author
Buccino, Andrea Paola
dc.contributor.author
Saffe, Carlos
dc.contributor.author
Mauas, Pablo Jacobo David
dc.date.available
2017-08-01T17:58:14Z
dc.date.issued
2017-02
dc.identifier.citation
Flores, Matias G.; Buccino, Andrea Paola; Saffe, Carlos; Mauas, Pablo Jacobo David; A possible long-term activity cycle for ι Horologii: First results from SPI-HKα project; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 464; 4; 2-2017; 4299-4305
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/21729
dc.description.abstract
In order to detect stellar activity cycles and study possiblestar-planet interactions (SPIs), we have been developing the HKαand SPI-HKα projects since 1999 and 2012 respectively. In thiswork, we present preliminary results of possible SPIs from studies ofchromospheric activity and look for possible correlations betweenstellar activity and stellar/planetary parameters. We find that forstars with a similar T<sub>eff</sub>, stellar activity increases withthe mass of the planet, similar to results from previous works. However,stellar ages can also play a role, and a larger stellar sample is neededto verify these trends. We also note that some of these stars present aremarkably high level of chromospheric activity, comparable even withRSCvn or BY Dra active stars. In addition, we do not observe anycorrelation between stellar activity and semi-major axis. We present thefirst long-term activity study of the star ι Horologii, a youngsolar-type star that hosts a non-transiting Jovian planet and exhibits ahigh activity level. We analysed our own spectra, obtained between 2002and 2015, in conjunction with public HARPS (High Accuracy Radialvelocity Planet Searcher) observations. We calculated the Ca II indexesderived from the 987 Complejo Astronómico El Leoncito (CASLEO)and HARPS spectra and converted them to the Mt Wilson scale. We found along-term activity cycle of ?5 yr which fits the active sequenceof Böhm-Vitense. The amplitude of this longer cycle is irregular,as was also observed for the shorter cycle. This phenomenon could beattributable to an antisymmetric distribution of active regions on thestellar surface.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Oxford University Press
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Planet-Star Interactions
dc.subject
Stars: Activity
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Stars: Individual: Ι Horologii
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Stars: Individual: Ι Horologii
dc.subject.classification
Astronomía
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Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
A possible long-term activity cycle for ι Horologii: First results from SPI-HKα project
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-07-31T21:46:05Z
dc.journal.volume
464
dc.journal.number
4
dc.journal.pagination
4299-4305
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Flores, Matias G.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina
dc.description.fil
Fil: Buccino, Andrea Paola. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.description.fil
Fil: Saffe, Carlos. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.journal.title
Monthly Notices of the Royal Astronomical Society
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stw2650
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article-abstract/464/4/4299/2527888/A-possible-long-term-activity-cycle-for-Horologii?redirectedFrom=fulltext


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