H${}_2$O maser emission associated with the planetary nebula IRAS 16333$-$4807

Abstract

We present simultaneous observations of H${}_2$O maser emission and radio continuum at 1.3 cm carried out with the Australia Telescope Compact Array towards two sources, IRAS 16333$-$4807 and IRAS 12405$-$6219, catalogued as planetary nebula (PN) candidates, and where single-dish detections of H${}_2$O masers have been previously reported. Our goal was to unambiguously confirm the spatial association of the H${}_2$O masers with these two PN candidates. We detected and mapped H${}_2$O maser emission in both fields, but only in IRAS 16333$-$4807 the maser emission is spatially associated with the radio continuum emission. The properties of IRAS 16333$-$4807 provide strong support for the PN nature of the object, hereby confirming it as the fifth known case of a H${}_2$O maser-emitting PN. This source is bipolar, like the other four known H${}_2$O maser-emitting PNe, indicating that these sources might pertain to a usual, but short phase in the evolution of bipolar PNe. In IRAS 12405$-$6219, the H${}_2$O maser and radio continuum emission are not associated with each other and, in addition, the available data indicate that this source is an H II region rather than a PN.

arXiv comment6 pages, 3 figures. Accepted by MNRAS

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• A search for water maser emission toward obscured post-AGB star and planetary nebula candidates
• Searching for nascent planetary nebulae: OHPNe candidates in the SPLASH survey
• Fallback in bipolar Planetary Nebulae ?