V346 Nor: the post-outburst life of a peculiar young eruptive star
Kóspál, Á; Szabó, ZM; Ábrahám, P; et al.Kraus, S; Takami, M; Lucas, PW; Contreras Peña, C; Udalski, A
Date: 3 February 2020
Journal
Astrophysical Journal
Publisher
American Astronomical Society / IOP Publishing
Publisher DOI
Abstract
FU Orionis-type objects (FUors) are young low-mass stars undergoing powerful accretion outbursts.
The increased accretion is often accompanied by collimated jets and energetic, large-scale molecular
outflows. The extra heating during the outburst may also induce detectable geometrical, chemical,
and mineralogical changes in the ...
FU Orionis-type objects (FUors) are young low-mass stars undergoing powerful accretion outbursts.
The increased accretion is often accompanied by collimated jets and energetic, large-scale molecular
outflows. The extra heating during the outburst may also induce detectable geometrical, chemical,
and mineralogical changes in the circumstellar material, affecting possible planet formation around
these objects. V346 Nor is a southern FUor with peculiar spectral characteristics. Decades after the
beginning of its outburst, it unexpectedly underwent a fading event around 2010 due to a decrease in
the mass accretion rate onto the star by at least two orders of magnitude. Here we present optical
and near-infrared photometry and spectroscopy obtained after the minimum. Our light curves show
a gradual re-brightening of V346 Nor, with its Ks-band brightness only 1.5 mag below the outburst
brightness level. Our VLT/XSHOOTER spectroscopic observations display several strong forbidden
emission lines towards the source from various metals and molecular hydrogen, suggesting the launch
of a new jet. Our N-band spectrum obtained with VLT/VISIR outlines a deeper silicate absorption
feature than before, indicating that the geometry of the circumstellar medium has changed in the
post-outburst period compared to peak brightness.
Physics and Astronomy
Faculty of Environment, Science and Economy
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