An updated catalog of OH-maser-emitting planetary nebulae
L. Uscanga, J. F. G\'omez, O. Su\'arez, L. F. Miranda

TL;DR
This study confirms six planetary nebulae with OH maser and radio emissions, revealing their bipolar morphology and suggesting that OH masers can persist longer than previously thought, aiding understanding of PN evolution.
Contribution
The paper provides the first confirmed list of OHPNe with interferometric data and discusses their morphological and evolutionary implications.
Findings
Six confirmed OHPNe with bipolar morphology
OH maser emission persists longer than 1000 years post-AGB
OH masers are associated with nonspherical mass-loss phenomena
Abstract
Aims. We studied the characteristics of planetary nebulae (PNe) that show both OH maser and radio continuum emission (hereafter OHPNe). These have been proposed to be very young PNe, and therefore, they could be key objects for understanding the formation and evolution of PNe. Methods. We consulted the literature searching for interferometric observations of radio continuum and OH masers toward evolved stars, including the information from several surveys. We also processed radio continuum and OH maser observations toward PNe in the Very Large Array data archive. The high positional accuracy provided by interferometric observations allow us to confirm or reject the association between OH maser and radio continuum emission. Results. We found a total of six PNe that present both OH maser and radio continuum emissions, as confirmed with radio interferometric observations. These are bona…
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