Abstract
Observations in the millimetre bands of maser-emitting planetary nebulae (PNe) are crucial to study their circumstellar molecular gas at the beginning of the PN phase. Maser-emitting PNe are in the earliest phases of PN formation; therefore, these sources are key objects to study the molecular content during the early evolution of PNe. These circumstellar envelopes are active sites for the formation of molecules. We present preliminary results of millimetre observations with the IRAM 30 m telescope towards one PN (IRAS 17393−2727) of a sample of five maser-emitting PNe, where we detect 12CO and 13CO lines in both J=1→0 and J=2→1 transitions.
Highlights
Planetary nebulae (PNe) are one of the last phases in the evolution of low- and intermediate-mass stars (≤8 M )
We carried out millimetre observations with the Institut de Radioastronomie Millimétrique (IRAM) 30 m telescope in August 2014 towards a sample of five maser-emitting
Velocities are given with respect to the kinematic definition of the Local Standard of Rest (LSR)
Summary
Planetary nebulae (PNe) are one of the last phases in the evolution of low- and intermediate-mass stars (≤8 M ). Their immediate precursors are stars in the asymptotic giant branch (AGB), followed by a short ('100–10,000 yr) transitional post-AGB phase. During the AGB phase, maser emission from the following molecules has been detected: SiO, H2 O, and OH [1]. Considering that the post-AGB phase is short, PNe showing H2 O and OH maser emissions are expected to be very young. Later, [14] detected HNC in the same sample of PNe. In a recent molecular line survey in PNe, CN emission was common in most of the sources together with the molecules mentioned above [15]. HCO+ , C18 O, and 12 CO, that was mapped with ALMA [19]
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