ALMA imaging of the nascent planetary nebula IRAS 15103-5754
Jose F. Gomez, Gilles Niccolini, Olga Suarez, Luis F. Miranda, J., Ricardo Rizzo, Lucero Uscanga, James A. Green, Itziar de Gregorio-Monsalvo

TL;DR
This study uses ALMA observations to analyze the structure and dynamics of the youngest known planetary nebula IRAS 15103-5754, revealing complex outflows, a circumstellar torus, and possible stellar system interactions.
Contribution
First detailed ALMA imaging of IRAS 15103-5754, identifying multiple outflows and proposing a triple stellar system origin for the nebula's features.
Findings
Detection of a circumstellar torus expanding at 23 km/s
Identification of high-velocity biconical outflows up to 250 km/s
Evidence supporting a triple stellar system origin with a common envelope phase
Abstract
We present continuum and molecular line (CO, CO, HCO) observations carried out with the Atacama Large Millimeter/submillimeter Array toward the "water fountain" star IRAS 15103-5754, an object that could be the youngest PN known. We detect two continuum sources, separated by arcsec. The emission from the brighter source seems to arise mainly from ionized gas, thus confirming the PN nature of the object. The molecular line emission is dominated by a circumstellar torus with a diameter of arcsec (2000 au) and expanding at km s. We see at least two gas outflows. The highest-velocity outflow (deprojected velocities up to 250 km s), traced by the CO lines, shows a biconical morphology, whose axis is misaligned with respect to the symmetry axis of the torus, and with a different central velocity (by …
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