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Title: V899 MON: an outbursting protostar with a peculiar light curve, and its transition phases
Authors: Ninan, J. P
Ojha, D. K
Baug, T
Bhatt, B. C
Mohan, V
Ghosh, S. K
Men'shchikov, A
Anupama, G. C
Tamura, M
Henning, Th
Keywords: Protoplanetary disks;Stars: early-type;Stars: formation;Stars: individual (V899 Mon);Stars: variables: T Tauri, Herbig Ae/Be;Stars: winds, outflows
Issue Date: 10-Dec-2015
Publisher: IOP Publishing
Citation: The Astrophysical Journal, Vol. 815, No. 1, 4
Abstract: We present a detailed study of V899 Mon (a new member in the FUors/EXors family of young low-mass stars undergoing outburst), based on our long-term monitoring of the source starting from 2009 November to 2015 April. Our optical and near-infrared photometric and spectroscopic monitoring recorded the source transitioning from its first outburst to a short-duration quiescence phase (<1 yr), and then returning to a second outburst. We report here the evolution of the outflows from the inner region of the disk as the accretion rate evolved in various epochs. Our high-resolution (R ~ 37,000) optical spectrum could resolve interesting clumpy structures in the outflow traced by various lines. Change in far-infrared flux was also detected between two outburst epochs. Based on our observations, we constrained various stellar and envelope parameters of V899 Mon, as well as the kinematics of its accretion and outflow. The photometric and spectroscopic properties of this source fall between classical FUors and EXors. Our investigation of V899 Mon hints at instability associated with magnetospheric accretion being the physical cause of the sudden short-duration pause of the outburst in 2011. It is also a good candidate to explain similar short-duration pauses in outbursts of some other FUors/EXors sources.
Description: Restricted Access
ISSN: 0004-637X
Appears in Collections:Publications based on data from IAO, Hanle
IIAP Publications

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