The messy death of a multiple star system and the resulting planetary nebula as observed by JWST

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Orsola De Marco Muhammad Akashi Stavros Akras Javier Alcolea Isabel Aleman Philippe Amram Bruce Balick Elvire De Beck Eric G. Blackman Henri M. J. Boffin Panos Boumis Jesse Bublitz Beatrice Bucciarelli Valentin Bujarrabal Jan Cami Nicholas Chornay You-Hua Chu Romano L. M. Corradi Adam Frank Guillermo Garcia-Segura

摘要： Planetary nebulae (PNe), the ejected envelopes of red giant stars, provide us with a history of the last, mass-losing phases of 90 percent of stars initially more massive than the Sun. Here, we analyse James Webb Space Telescope (JWST) Early Release Observation (ERO) images of the PN NGC3132. A structured, extended H2 halo surrounding an ionised central bubble is imprinted with spiral structures, likely shaped by a low-mass companion orbiting the central star at 40-60 AU. The images also reveal a mid-IR excess at the central star interpreted as a dusty disk, indicative of an interaction with another, closer companion. Including the previously known, A-type visual companion, the progenitor of the NGC3132 PN must have been at least a stellar quartet. The JWST images allow us to generate a model of the illumination, ionisation and hydrodynamics of the molecular halo, demonstrating the power of JWST to investigate complex stellar outflows. Further, new measurements of the A-type visual companion allow us to derive the value for the mass of the progenitor of a central star to date with excellent precision: 2.86+/-0.06 Mo. These results serve as path finders for future JWST observations of PNe providing unique insight into fundamental astrophysical processes including colliding winds, and binary star interactions, with implications for supernovae and gravitational wave systems.

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