4 papers
Interferometric molecular line observations toward the 21 μm protoplanetary nebula IRAS 06530-0213
Hao-Min Sun, Zhuang Zhang, Jun-Yang Liu +2
The identification of the feature in some protoplanetary nebulae remains a longstanding puzzle, whose interpretation requires characterization of the molecular ga…
Herschel/HIFI Observations of Molecular Lines Toward G10.47+0.03
Indrajit Mondal, Prasanta Gorai, Ankan Das +6
We present a spectral line analysis of the hot molecular core G10.47+0.03 (hereafter, G10). Our aim is to determine molecular abundances and excitation conditions across a wide spe…
Cocoon-to-Butterfly Transformation in Protoplanetary Nebula: Detection of a Spherical Halo and a Barrel-shaped Torus in IRAS 065300213
Hao-Min Sun, Yong Zhang, Sheng-Li Qin
Protoplanetary nebulae (PPNs) represent a critical evolutionary bridging stage between the asymptotic giant branch (AGB) and planetary nebula (PN) stages. Their dynamical structure…
A molecule-rich torus-like structure in the 21 m source IRAS 23304+6147
Hao-Min Sun, Yong Zhang, Xu-Jia Ouyang +4
A long-standing enigma in observational astronomy is the identification of the so-called 21 m feature in a subset of envelopes of post-asymptotic giant branch (post-AGB) stars.…