Poster abstract details

In this work, we show Halpha spectropolarimetry and Near-Infrared (NIR) polarimetry measurements of the bipolar proto-planetary nebula (PPN) M1-92. In general, the determination of the scattering mechanism using polarimetry can help to constrain the optical depth of the circumstellar envelope or disk. In addition, line effects using spectropolarimetry can be used to distinguish between “windy” or “disky” scenarios for the circumstellar matter. Our halpha spectropolarimetry data detect a well defined line effect consistent with depolarization in a windy envelope in M1-92. On the other hand, our NIR polarization map resolves both lobules and detects a center-symmetric pattern around them. In addition, evidence of a polarization disk is also found. When we analyze the integrated NIR polarization, we found that the polarization angle is exactly perpendicular to the lobules axis suggesting an optically thick envelope/disk. Finally, when we correlate an optical polarization map of foreground stars around M1-92, we found that the lobules axis is approximately perpendicular with the local insterstellar magnetic field suggesting a weak magnetic support. We analyze our findings putting in context with our actual understanding of the PPN phase.