Discovery of a double ring in the core of eta Carinae

Abstract

We report the discovery of a double ring structure in the waist of the nebula surrounding eta Carinae. The rings are detected in the mid-IR dust continuum at wavelengths of 7.9, 11.9, 12.9 and 20 micronmeter. The dust in the rings has a temperature of about 300 K. The orientation of the rings is inclined with respect to the axis of the homunculus by either 37 or 58 degrees. The central star is not in the projected centre of the structure defined by the two rings. This geometry is reminiscent of that seen in SN1987A and some planetary nebulae. We discuss several possible origins for this remarkable geometry and its orientation.

Accepted for publication in A&A Letters

Cited by in corpus (7)

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• Submillimetre Emission from Eta Carinae
• Formation of Double Rings Around Evolved Stars
• Spatial distribution and kinematics of the molecular material associated with $\eta$ Carinae
• $\eta$ Carinae: high angular resolution continuum, H30$\alpha$ and He30$\alpha$ ALMA images