The most variable VVV sources: eruptive protostars, dipping giants in the Nuclear Disc and others

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dc.catalogadorpau
dc.contributor.authorLucas, Phil
dc.contributor.authorSmith, Leigh
dc.contributor.authorGuo, Zhen
dc.contributor.authorContreras Peña, Carlos
dc.contributor.authorMinniti, Dante
dc.contributor.authorMiller, Niall
dc.contributor.authorAlonso-Garcia, Javier
dc.contributor.authorCatelan, Marcio
dc.contributor.authorBorissova, J.
dc.contributor.authorSaito, Roberto
dc.contributor.authorKurtev, Radostin
dc.contributor.authorNavarro, M. G.
dc.contributor.authorMorris, Calum
dc.contributor.authorMuthu, Hariharan
dc.contributor.authorFroebrich, Dirk
dc.contributor.authorIvanov, Valentin
dc.contributor.authorBayo, Amelia
dc.contributor.authorCaratti, Alessio
dc.contributor.authorSanders, Jason
dc.date.accessioned2024-03-05T15:14:24Z
dc.date.available2024-03-05T15:14:24Z
dc.date.issued2023
dc.description.abstractWe have performed a comprehensive search of a VISTA Variables in the Via Lactea (VVV) data base of 9.5 yr light curves for variable sources with ΔKs ≥ 4 mag, aiming to provide a large sample of high amplitude eruptive young stellar objects (YSOs) and detect unusual or new types of infrared variable source. We find 222 variable or transient sources in the Galactic bulge and disc, most of which are new discoveries. The sample mainly comprises novae, YSOs, microlensing events, Long Period Variable stars (LPVs), and a few rare or unclassified sources. Additionally, we report the discovery of a significant population of aperiodic late-type giant stars suffering deep extinction events, strongly clustered in the Nuclear Disc of the Milky Way. We suggest that these are metal-rich stars in which radiatively driven mass loss has been enhanced by super-solar metallicity. Among the YSOs, 32/40 appear to be undergoing episodic accretion. Long-lasting YSO eruptions have a typical rise time of ∼2 yr, somewhat slower than the 6–12 month time-scale seen in the few historical events observed on the rise. The outburst durations are usually at least 5 yr, somewhat longer than many lower amplitude VVV events detected previously. The light curves are diverse in nature, suggesting that multiple types of disc instability may occur. Eight long-duration extinction events are seen wherein the YSO dims for a year or more, attributable to inner disc structure. One binary YSO in NGC 6530 displays periodic extinction events (P=59 d) similar to KH 15D.
dc.fechaingreso.objetodigital2024-09-11
dc.fuente.origenORCID
dc.identifier.doi10.1093/mnras/stad3929
dc.identifier.urihttps://doi.org/10.1093/mnras/stad3929
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/83911
dc.information.autorucInstituto de Astrofísica; Catelan , Marcio; 0000-0001-6003-8877; 1001556
dc.language.isoen
dc.nota.accesocontenido parcial
dc.rightsacceso restringido
dc.titleThe most variable VVV sources: eruptive protostars, dipping giants in the Nuclear Disc and others
dc.typeartículo
sipa.codpersvinculados1001556
sipa.trazabilidadORCID;2024-01-22
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