Polarization properties of OH emission in planetary nebulae

DOI: 
10.1093/mnras/stw1536
Publication date: 
01/09/2016
Main author: 
Gómez, José F.
IAA authors: 
Gómez, José F.;Miranda, Luis F.
Authors: 
Gómez, José F.;Uscanga, Lucero;Green, James A.;Miranda, Luis F.;Suárez, Olga;Bendjoya, Philippe
Journal: 
Monthly Notices of the Royal Astronomical Society
Refereed: 
Yes
Publication type: 
Article
Volume: 
461
Pages: 
3259-3273
Abstract: 
We present the interferometric, full-polarization observations of the four ground-state transitions of OH, towards five confirmed and one candidate OH-emitting planetary nebulae (OHPNe). OHPNe are believed to be very young PNe, and information on their magnetic fields (provided by their polarization) could be key to understand the early evolution of PNe. We detect significant circular and linear polarization in four and two objects, respectively. Possible Zeeman pairs are seen in JaSt 23 and IRAS 17393-2727, resulting in estimates of magnetic field strengths between 0.8 and 24 mG. We also report the new detection of OH emission at 1720 MHz towards Vy 2-2, making it the third known PN with this type of emission. We suggest that younger PNe have spectra dominated by narrow maser features and higher degrees of polarization. Shock-excited emission at 1720 MHz seems to be more common in PNe than in early evolutionary phases, and could be related to equatorial ejections during the early PN phase.
Database: 
ADS
SCOPUS
WOK
URL: 
https://ui.adsabs.harvard.edu/#abs/2016MNRAS.461.3259G/abstract
ADS Bibcode: 
2016MNRAS.461.3259G
Keywords: 
magnetic fields;masers;polarization;stars: AGB and post-AGB;planetary nebulae: general;Astrophysics - Solar and Stellar Astrophysics;Astrophysics - Astrophysics of Galaxies