dc.contributor.author | Guo, Zhen | |
dc.contributor.author | Lucas, P. W. | |
dc.contributor.author | Peña, C. Contreras | |
dc.contributor.author | Kurtev, R. G. | |
dc.contributor.author | Smith, L. C. | |
dc.contributor.author | Borissova, J. | |
dc.contributor.author | Alonso-García, J. | |
dc.contributor.author | Minniti, D. | |
dc.contributor.author | Garatti, A. Caratti o | |
dc.contributor.author | Froebrich, Dirk | |
dc.date.accessioned | 2020-03-10T01:06:56Z | |
dc.date.available | 2020-03-10T01:06:56Z | |
dc.date.issued | 2020-02-01 | |
dc.identifier.citation | Guo , 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.issn | 0035-8711 | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/1912.00729v1 | |
dc.identifier.other | ORCID: /0000-0002-8872-4462/work/70585847 | |
dc.identifier.uri | http://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.abstract | Numerous 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.extent | 21 | |
dc.format.extent | 3761124 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.subject | Herbig Ae/Be | |
dc.subject | Infrared: stars | |
dc.subject | Stars: pre-main sequence | |
dc.subject | Stars: protostars | |
dc.subject | Stars: variables: T Tauri | |
dc.subject | Astronomy and Astrophysics | |
dc.subject | Space and Planetary Science | |
dc.title | Short and long term near-infrared spectroscopic variability of eruptive protostars from VVV | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.description.status | Peer reviewed | |
dc.identifier.url | http://www.scopus.com/inward/record.url?scp=85079445095&partnerID=8YFLogxK | |
rioxxterms.versionofrecord | 10.1093/mnras/stz3374 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |