Predictions of astrometric jitter for sun-like stars. II. dependence on ınclination, metallicity, and active-region nesting

Basit Öğe Kaydı
dc.authorid0000-0001-6163-0653
dc.contributor.authorKrishnamurthy, Sowmya
dc.contributor.authorNemec, Nina Elisabeth
dc.contributor.authorShapiro, Alexander
dc.contributor.authorIşık, Emre
dc.contributor.authorWitzke, Veronika
dc.contributor.authorMints, Alexey
dc.contributor.authorKrivova, Natalie
dc.contributor.authorSolanki, Sami
dc.date.accessioned2022-01-11T06:51:51Z
dc.date.available2022-01-11T06:51:51Z
dc.date.issued2021
dc.departmentTAÜ, Mühendislik Fakültesi, Bilgisayar Mühendisliği Bölümüen_US
dc.description.abstractUltra-precise astrometry from the Gaia mission is expected to lead to astrometric detections of more than 20,000 exoplanets in our Galaxy. One of the factors that could hamper such detections is the astrometric jitter caused by the magnetic activity of the planet host stars. In our previous study, we modeled astrometric jitter for the Sun observed equator-on. In this work, we generalize our model and calculate the photocenter jitter as it would be measured by the Gaia and Small-JASMINE missions for stars with solar rotation rate and effective temperature, but with various values of the inclination angle of the stellar rotation axis. In addition, we consider the effect of metallicity and of nesting of active regions (i.e., the tendency of active regions to emerge in the vicinity of each other). We find that, while the jitter of stars observed equator-on does not have any long-term trends and can be easily filtered out, the photocenters of stars observed out of their equatorial planes experience systematic shifts over the course of the activity cycle. Such trends allow the jitter to be detected with continuous measurements, in which case it can interfere with planet detectability. An increase in the metallicity is found to increase the jitter caused by stellar activity. Active-region nesting can further enhance the peak-to-peak amplitude of the photocenter jitter to a level that could be detected by Gaia.
dc.identifier.citationSowmya, K., Nèmec, N. E., Shapiro, A. I., Işık, E., Witzke, V., Mints, A., ... & Solanki, S. K. (2021). Predictions of Astrometric Jitter for Sun-like Stars. II. Dependence on Inclination, Metallicity, and Active-region Nesting. The Astrophysical Journal, 919(2), 94.
dc.identifier.doi10.3847/1538-4357/ac111b
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.issue2en_US
dc.identifier.scopus2-s2.0-85116888446
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://hdl.handle.net/20.500.12846/623
dc.identifier.volume919en_US
dc.identifier.wosWOS:000701261500001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorIşık, Emre
dc.language.isoen
dc.publisherIOP Publishing
dc.relation.ispartofThe Astrophysical Journal
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectSolar Irradianceen_US
dc.subjectReconstructionen_US
dc.subjectCyclesen_US
dc.subjectGüneş Işınımıen_US
dc.subjectYeniden Yapılanmaen_US
dc.subjectSonneneinstrahlungen_US
dc.subjectWiederaufbauen_US
dc.subjectFahrräderen_US
dc.titlePredictions of astrometric jitter for sun-like stars. II. dependence on ınclination, metallicity, and active-region nesting
dc.typeArticle

Dosyalar

Orijinal paket
Listeleniyor 1 - 1 / 1
Küçük Resim
İsim:
emreısık.pdf
Boyut:
4.87 MB
Biçim:
Adobe Portable Document Format
Açıklama:
Tam Metin / Full Text
İndir
Lisans paketi
Listeleniyor 1 - 1 / 1
[ X ]
İsim:
license.txt
Boyut:
1.44 KB
Biçim:
Item-specific license agreed upon to submission
Açıklama:
İndir

Koleksiyon

Bilgisayar Mühendisliği Bölümü Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu
WoS İndeksli Yayınlar Koleksiyonu