Rapidly-evolving episodic outflow in IRAS 18113-2503: clues to the ejection mechanism of the fastest water fountain

Abstract

Water fountains are evolved stars showing early stages of collimated mass loss during transition from the asymptotic giant branch, providing valuable insight into the formation of asymmetric planetary nebulae. We report the results of multi-epoch VLBI observations, which determine the spatial and three-dimensional kinematic structure of H2O masers associated with the water fountain IRAS 18113-2503. The masers trace three pairs of high-velocity (~150-300 km/s) bipolar bow shocks on a scale of 0.18'' (~2000 au). The expansion velocities of the bow shocks exhibit an exponential decrease as a function of distance from the central star, which can be explained by an episodic, jet-driven outflow decelerating due to drag forces in a circumstellar envelope. Using our model, we estimate an initial ejection velocity ~840 km/s, a period for the ejections ~10 yr, with the youngest being ~12 yr old, and an average envelope density within the H2O maser region n(H2) ~ 10^6 cm^(-3). We hypothesize that IRAS 18113-2503 hosts a binary central star with a separation of ~10 au, revealing novel clues about the launching mechanisms of high-velocity collimated outflows in water fountains.

arXiv commentAccepted for publication in Monthly Notices of the Royal Astronomical Society Letters (September 17, 2018). Supplementary material is included

References in corpus (31)

• DiFX2: A more flexible, efficient, robust and powerful software correlator
• The Initial-Final Mass Relation: Direct Constraints at the Low Mass End
• New cooling sequences for old white dwarfs
• Low-Mass Binary Induced Outflows from Asymptotic Giant Branch Stars
• The Formation of Very Narrow Waist Bipolar Planetary Nebulae
• Hydrodynamical Simulations of Jet- and Wind-driven Protostellar Outflows
• A magnetically collimated jet from an evolved star
• Interstellar H${}_2$O Masers from J Shocks
• Close stellar binary systems by grazing envelope evolution
• ALMA imaging of the nascent planetary nebula IRAS 15103-5754
• A Multi-Epoch HST Study of the Herbig-Haro Flow from XZ Tauri
• The spatio-kinematical structure and distance of the pre-planetary nebula IRAS 19134+2131
• A Massive Bipolar Outflow and a Dusty Torus with Large Grains in the Pre-Planetary Nebula IRAS 22036+5306
• Collimated Outflow Formation via Binary Stars. 3-D Simulations of AGB Wind and Disk Wind Interactions
• Observational evidence for the shrinking of bright maser spots
• OH 12.8-0.9: A New Water-Fountain Source
• ALMA Observations of the Water Fountain Pre-Planetary Nebula IRAS 16342-3814: High-velocity bipolar jets and an Expanding Torus
• High Velocity Precessing Jets from the Water Fountain IRAS 18286-0959 Revealed by VLBA Observations
• IRAS 18113-2503: the water fountain with the fastest jet?
• ALMA view of the circumstellar environment of the post-common-envelope-evolution binary system HD101584
• VLA observations of the "water fountain" IRAS 16552-3050
• SALT HRS discovery of a long period double-degenerate binary in the planetary nebula NGC 1360
• Trigonometric distance and proper motions of H2O maser bowshocks in AFGL 5142
• Annual Parallax Distance and Secular Motion of the Water Fountain Source IRAS 18286-0959
• First detection of CO lines in a water fountain star
• From the ashes: JVLA observations of water fountain nebula candidates show the rebirth of IRAS 18455+0448
• Sensitive CO and 13CO survey of water fountain stars. Detections towards IRAS 18460-0151 and IRAS 18596+0315
• Interferometric confirmation of "water fountain" candidates
• Extremely Strong ^{13}CO J=3-2 Line in the "Water Fountain" IRAS 16342-3814: Evidence for the Hot-Bottom Burning
• A search for water maser emission toward obscured post-AGB star and planetary nebula candidates
• An Extreme High-Velocity Bipolar Outflow in the Pre-Planetary Nebula IRAS 08005-2356

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• Shaping `Ears' in planetary nebulae by early jets
• The future influence of six exoplanets on the envelope properties of their parent stars on the giant branches
• FLASHING: New high-velocity H${}_2$O masers in IRAS 18286$-$0959
• Evolution of the outflow in the water fountain source IRAS 18043$-$2116
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