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dc.contributor.authorGuo, Zhen
dc.contributor.authorLucas, P. W.
dc.contributor.authorPeña, C. Contreras
dc.contributor.authorKurtev, R. G.
dc.contributor.authorSmith, L. C.
dc.contributor.authorBorissova, J.
dc.contributor.authorAlonso-García, J.
dc.contributor.authorMinniti, D.
dc.contributor.authorGaratti, A. Caratti o
dc.contributor.authorFroebrich, Dirk
dc.date.accessioned2020-03-10T01:06:56Z
dc.date.available2020-03-10T01:06:56Z
dc.date.issued2020-02-01
dc.identifier.citationGuo , Z , Lucas , P W , Peña , C C , Kurtev , R G , Smith , L C , Borissova , J , Alonso-García , J , Minniti , D , Garatti , A C O & Froebrich , D 2020 , ' Short and long term near-infrared spectroscopic variability of eruptive protostars from VVV ' , Monthly Notices of the Royal Astronomical Society , vol. 492 , no. 1 , pp. 294-314 . https://doi.org/10.1093/mnras/stz3374
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 18860132
dc.identifier.otherPURE UUID: b3e0eda3-a2b3-4d1a-bbea-2e92f8c6b719
dc.identifier.otherArXiv: http://arxiv.org/abs/1912.00729v1
dc.identifier.otherScopus: 85079445095
dc.identifier.otherORCID: /0000-0002-8872-4462/work/70585847
dc.identifier.urihttp://hdl.handle.net/2299/22397
dc.description© 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
dc.description.abstractNumerous eruptive variable young stellar objects (YSOs), mostly Class I systems, were recently detected by the near-infrared Vista Variables in the Via Lactea (VVV) survey. We present an exploratory near-infrared spectroscopic variability study of 14 eruptive YSOs. The variations were sampled over 1-day and 1 to 2-year intervals and analysed in combination with VVV light curves. CO overtone absorption features are observed on 3 objects with FUor-like spectra: all show deeper absorption when they are brighter. This implies stronger emission from the circumstellar disc with a steeper vertical temperature gradient when the accretion rate is higher. This confirms the nature of fast VVV FUor-like events, in line with the accepted picture for classical FUors. The absence of Br$\gamma$ emission in a FUor-like object declining to pre-outburst brightness suggests that reconstruction of the stellar magnetic field is a slow process. Within the 1-day timescale, 60% of H$_2$-emitting YSOs show significant but modest variation, and 2/6 sources have large variations in Br$\gamma$. Over year-long timescales, H$_2$ flux variations remain modest despite up to 1.8 mag variation in $K_s$. This indicates that emission from the molecular outflow usually arises further from the protostar and is unaffected by relatively large changes in accretion rate on year-long timescales. Two objects show signs of on/off magnetospheric accretion traced by Br$\gamma$ emission. In addition, a 60% inter-night brightening of the H$_2$ outflow is detected in one YSO.en
dc.format.extent21
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.subjectHerbig Ae/Be
dc.subjectInfrared: stars
dc.subjectStars: pre-main sequence
dc.subjectStars: protostars
dc.subjectStars: variables: T Tauri
dc.subjectAstronomy and Astrophysics
dc.subjectSpace and Planetary Science
dc.titleShort and long term near-infrared spectroscopic variability of eruptive protostars from VVVen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85079445095&partnerID=8YFLogxK
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2020-02-01
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stz3374
rioxxterms.licenseref.uriOther
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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