Recent outburst of the young star V1180 Cas

Abstract

We report on the ongoing outburst of the young variable V1180 Cas, which is known to display characteristics in common with EXor eruptive variables. We present results that support the scenario of an accretion-driven nature of the brightness variations of the object and provide the first evidence of jet structures around the source. We monitored the recent flux variations of the target in the Rc, J, H, and K bands. New optical and near-IR spectra taken during the current high state of V1180 Cas are presented, in conjunction with H2 narrow-band imaging of the source. Observed near-IR colour variations are analogous to those observed in EXors and consistent with excess emission originating from an accretion event. The spectra show numerous emission lines, which indicates accretion, ejection of matter, and an active disc. Using optical and near-IR emission features we derive a mass accretion rate of ~3 E-8 Msun/yr, which is an order of magnitude lower than previous estimates. In addition, a mass loss rate of ~4 E-9 and ~4 E-10 Msun/yr are estimated from atomic forbidden lines and H2, respectively. Our H2 imaging reveals two bright knots of emission around the source and the nearby optically invisible star V1180 Cas B, clearly indicative of mass-loss phenomena. Higher resolution observations of the detected jet will help to clarify whether V1180 Cas is the driving source and to determine the relation between the observed knots.

arXiv commentAccepted as Letter in A&A; 4 pages, 3 figures

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Cited by in corpus (12)

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• The 2015-2016 outburst of the classical EXor V1118 Ori
• High-resolution TNG spectra of T Tauri stars: Near-IR GIANO observations of the young variables XZ Tau and DR Tau
• On the 2015 outburst of the EXor variable star V1118 Ori
• The 2016-2017 peak luminosity of the pre-main sequence variable V2492 Cyg
• Towards a better classification of unclear eruptive variables: the cases of V2492 Cyg, V350 Cep, and ASASSN-15qi
• A new insight into the V1184 Tau variability
• Investigating the past history of EXors: the cases of V1118 Ori, V1143 Ori, and NY Ori
• The young stellar population of Lynds 1340. An infrared view
• First X-ray dectection of the young variable V1180 Cas
• Protostellar Outflows in L1340
• Long-term Photometric Study of the Pre-main Sequence Star V1180 Cas