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Molecules in the peculiar age-defying source IRAS 19312+1950
Molecules in the peculiar age-defying source IRAS 19312+1950 by Jian-Jie Qiu et al. on Sunday 27 November
Context. IRAS 19312+1950 is an isolated infrared source that exhibits a
characteristic quasi-point-symmetric morphology in the near- and mid-infrared
images and is also very bright in molecular radio lines. Because of its unique
observational characteristics, various observational studies have been
conducted and several hypotheses have been proposed regarding its origin, which
is still unclear. So far, it has been suggested that it could be a peculiar
evolved star, a young stellar object, or even a red nova remnant. Regardless of
which type of object it is ultimately classified as, IRAS 19312+1950 is
exceptionally bright in the infrared and molecular radio lines and therefore
will undoubtedly be crucial as a prototype of this kind of object having a
peculiar nature or unusual evolutionary phase.
Aims. This study aims to reveal the molecular composition of the central part
of IRAS 19312+1950 by performing an unbiased molecular radio line survey and
discussing the origin of the object from a molecular chemical point of view.
Methods. We carried out a spectral line survey with the IRAM 30 m telescope
towards the center of IRAS 19312+1950 in the 3 and 1.3 mm windows.
Results. In total, 28 transition lines of 22 molecular species and those
isotopologues are detected towards IRAS 19312+1950, some of which exhibit a
broad and a narrow components. Seventeen thermal lines and 1 maser line are
newly detected. The molecular species of C$^{17}$O, $^{30}$SiO, HN$^{13}$C,
HC$^{18}$O$^{+}$, H$_{2}$CO, and $c$-C$_{3}$H$_{2}$ are detected for the first
time in this object.
Conclusions. Our results, in combination with previous studies, favor the
hypothesis that IRAS 19312+1950 might be a red nova remnant, in which the
progenitors that merged to become a red nova may have contained at least two
evolved stars with oxygen-rich and carbon-rich chemistry, respectively.
arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.13640v1
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By Corentin CadiouMolecules in the peculiar age-defying source IRAS 19312+1950 by Jian-Jie Qiu et al. on Sunday 27 November
Context. IRAS 19312+1950 is an isolated infrared source that exhibits a
characteristic quasi-point-symmetric morphology in the near- and mid-infrared
images and is also very bright in molecular radio lines. Because of its unique
observational characteristics, various observational studies have been
conducted and several hypotheses have been proposed regarding its origin, which
is still unclear. So far, it has been suggested that it could be a peculiar
evolved star, a young stellar object, or even a red nova remnant. Regardless of
which type of object it is ultimately classified as, IRAS 19312+1950 is
exceptionally bright in the infrared and molecular radio lines and therefore
will undoubtedly be crucial as a prototype of this kind of object having a
peculiar nature or unusual evolutionary phase.
Aims. This study aims to reveal the molecular composition of the central part
of IRAS 19312+1950 by performing an unbiased molecular radio line survey and
discussing the origin of the object from a molecular chemical point of view.
Methods. We carried out a spectral line survey with the IRAM 30 m telescope
towards the center of IRAS 19312+1950 in the 3 and 1.3 mm windows.
Results. In total, 28 transition lines of 22 molecular species and those
isotopologues are detected towards IRAS 19312+1950, some of which exhibit a
broad and a narrow components. Seventeen thermal lines and 1 maser line are
newly detected. The molecular species of C$^{17}$O, $^{30}$SiO, HN$^{13}$C,
HC$^{18}$O$^{+}$, H$_{2}$CO, and $c$-C$_{3}$H$_{2}$ are detected for the first
time in this object.
Conclusions. Our results, in combination with previous studies, favor the
hypothesis that IRAS 19312+1950 might be a red nova remnant, in which the
progenitors that merged to become a red nova may have contained at least two
evolved stars with oxygen-rich and carbon-rich chemistry, respectively.
arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.13640v1