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Binarity as the Origin of Long Secondary Periods in Red Giant Stars

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dc.abstract.enLong secondary periods (LSPs), observed in a third of pulsating red giant stars, are the only unexplained type of large-amplitude stellar variability known at this time. Here we show that this phenomenon is a manifestation of a substellar or stellar companion orbiting the red giant star. Our investigation is based on a sample of about 16,000 well-defined LSP variables detected in the long-term OGLE photometric database of the Milky Way and Magellanic Clouds, combined with the mid-infrared data extracted from the NEOWISE-R archive. From this collection, we selected about 700 objects with stable, large-amplitude, well-sampled infrared light curves and found that about half of them exhibit secondary eclipses, thus presenting an important piece of evidence that the physical mechanism responsible for LSPs is binarity. Namely, the LSP light changes are due to the presence of a dusty cloud orbiting the red giant together with the companion and obscuring the star once per orbit. The secondary eclipses, visible only in the infrared wavelength, occur when the cloud is hidden behind the giant. In this scenario, the low-mass companion is a former planet that has accreted a significant amount of mass from the envelope of its host star and grown into a brown dwarf.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorSoszyński, Igor
dc.contributor.authorOlechowska, Anna
dc.contributor.authorRatajczak, Milena
dc.contributor.authorIwanek, Patryk
dc.contributor.authorSkowron, Dorota
dc.contributor.authorMróz, Przemysław
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorSzymański, Michał
dc.contributor.authorSkowron, Jan
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorPoleski, Radosław
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorWrona, Marcin
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorRybicki, Krzysztof
dc.date.accessioned2024-01-24T18:36:24Z
dc.date.available2024-01-24T18:36:24Z
dc.date.copyright2021-03-23
dc.date.issued2021
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeŚrodki finansowe przyznane na realizację projektu w zakresie badań naukowych lub prac rozwojowych
dc.description.number2
dc.description.versionORIGINAL_AUTHOR
dc.description.volume911
dc.identifier.doi10.3847/2041-8213/ABF3C9
dc.identifier.issn2041-8205
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/102299
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2021ApJ...911L..22S
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal Letters
dc.relation.pagesL22
dc.rightsOther
dc.sciencecloudnosend
dc.titleBinarity as the Origin of Long Secondary Periods in Red Giant Stars
dc.typeJournalArticle
dspace.entity.typePublication