Analysis of physical processes in eruptive YSOs with near-infrared spectra and multiwavelength light curves

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dc.contributor.authorGuo, Zhen
dc.contributor.authorLucas, P W
dc.contributor.authorContreras Peña, C
dc.contributor.authorSmith, L C
dc.contributor.authorMorris, C
dc.contributor.authorKurtev, R G
dc.contributor.authorBorissova, J
dc.contributor.authorAlonso-García, J
dc.contributor.authorMinniti, D
dc.contributor.authorChené, A-N
dc.contributor.authorKumar, M S N
dc.contributor.authorCaratti O Garatti, A
dc.contributor.authorFroebrich, D
dc.contributor.authorStimson, W H
dc.date.accessioned2022-11-30T02:46:25Z
dc.date.available2022-11-30T02:46:25Z
dc.date.issued2021
dc.description.abstractThe decade-long Vista Variables in the Via Lactea (VVV) survey has detected numerous highly variable young stellar objects (YSOs). We present a study of 61 highly variable VVV YSOs (ΔKs = 1–5 mag), combining near-infrared spectra from Magellan and ESO Very Large Telescope with VVV and NEOWISE light curves to investigate physical mechanisms behind eruptive events. Most sources are spectroscopically confirmed as eruptive variables (typically Class I YSOs) but variable extinction is also seen. Among them, magnetically controlled accretion, identified by H I recombination emission (usually accompanied by CO emission), is observed in 46 YSOs. Boundary layer accretion, associated with FU Ori-like outbursts identified by CO overtone and H2O absorption, is observed only in longer duration events (≥5 yr total duration). However, even in long duration events, the magnetically controlled accretion mode predominates, with amplitudes similar to the boundary layer mode. Shorter (100–700 d) eruptive events usually have lower amplitudes and these events are generally either periodic accretors or multiple time-scale events, wherein large photometric changes occur on time-scales of weeks and years. We find that the ratio of amplitudes in Ks and W2 can distinguish between variable accretion and variable extinction. Several YSOs are periodic or quasi-periodic variables. We identify examples of periodic accretors and extinction-driven periodicity among them (with periods up to 5 yr) though more data are needed to classify some cases. The data suggest that dynamic interactions with a companion may control the accretion rate in a substantial proportion of eruptive systems, although star–disc interactions should also be considered.en_ES
dc.facultadFacultad de Cienciasen_ES
dc.file.nameGuo_Ana2021.pdf
dc.identifier.doihttps://doi.org/10.1093/mnras/stab882
dc.identifier.urihttp://repositoriobibliotecas.uv.cl/handle/uvscl/7363
dc.languageen
dc.publisherRoyal Astronomical Society
dc.rights© 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/),
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectSTARS: AGB AND POST-AGBen_ES
dc.subjectSTARS: PRE-MAIN-SEQUENCEen_ES
dc.subjectSTARS: PROTOSTARSen_ES
dc.subjectSTARS: VARIABLES: T TAURIen_ES
dc.subjectHERBIG AE/BEen_ES
dc.subjectSTARS: WOLF–RAYETen_ES
dc.subjectINFRARED: STARSen_ES
dc.titleAnalysis of physical processes in eruptive YSOs with near-infrared spectra and multiwavelength light curves
dc.typeArticulo
uv.departamentoInstituto de Fisica y Astronomia

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