Two Distinct-Absorption X-Ray Components from Type IIn Supernovae: Evidence for Asphericity in the Circumstellar Medium

Abstract

We present multi-epoch X-ray spectral observations of three Type IIn supernovae (SNe) 2005kd, 2006jd, and 2010jl, acquired with Chandra, XMM-Newton, Suzaku, and Swift. Previous extensive X-ray studies of SN 2010jl have revealed that X-ray spectra are dominated by thermal emission, which likely arises from a hot plasma heated by a forward shock propagating into a massive circumstellar medium (CSM). Interestingly, an additional soft X-ray component was required to reproduce the spectra at a period of ~1-2 yr after the SN explosion. Although this component is likely associated with the SN, its origin remained an open question. We find a similar, additional soft X-ray component from the other two SNe IIn as well. Given this finding, we present a new interpretation for the origin of this component; it is thermal emission from a forward shock essentially identical to the hard X-ray component, but directly reaches us from a void of the dense CSM. Namely, the hard and soft components are responsible for the heavily- and moderately-absorbed components, respectively. The co-existence of the two components with distinct absorptions as well as the delayed emergence of the moderately-absorbed X-ray component would be evidence for asphericity of the CSM. We show that the X-ray spectral evolution can be qualitatively explained by considering a torus-like geometry for the dense CSM. Based on our X-ray spectral analyses, we estimate the radius of the torus-like CSM to be on the order of ~5 times 10^{16} cm.

arXiv comment11 pages, 3 figures, accepted for publication in The Astrophysical Journal

References in corpus (29)

• On the Absorption of X-rays in the Interstellar Medium
• Collisional Plasma Models with APEC/APED: Emission Line Diagnostics of Hydrogen-like and Helium-like Ions
• Mass Loss: Its Effect on the Evolution and Fate of High-Mass Stars
• Observed Fractions of Core-Collapse Supernova Types and Initial Masses of their Single and Binary Progenitor Stars
• Supernova Remnants in the Sedov Expansion Phase: Thermal X-Ray Emission
• Spectropolarimetry of Supernovae
• Evidence for Asphericity in the Type IIn Supernova 1998S
• High Density Circumstellar Interaction in the Luminous Type IIn SN 2010jl: The first 1100 days
• The type IIn supernova 1994W: evidence for the explosive ejection of a circumstellar envelope
• Multi-wavelength Observations of the Enduring Type IIn Supernovae 2005ip and 2006jd
• Optical and Ultraviolet Spectroscopy of SN 1995N: Evidence for Strong Circumstellar Interaction
• An Analytic Bolometric Light Curve Model of Interaction-Powered Supernovae and its Application to Type IIn Supernovae
• SN 2010jl: Optical to hard X-ray observations reveal an explosion embedded in a ten solar mass cocoon
• Panchromatic Observations of SN 2011dh Point to a Compact Progenitor Star
• SN 2010jl in UGC 5189: Yet another luminous type IIn supernova in a metal-poor galaxy
• What are Published X-ray lightcurves telling us about Young Supernova Expansion?
• X-ray and radio emission from Type IIn supernova SN 2010jl
• Radio and X-ray observations of SN 2006jd: Another strongly interacting Type IIn supernova
• Metallicity at the explosion sites of interacting transients
• Asymmetries in the Type IIn SN2010jl
• The Dual-Axis Circumstellar Environment of the Type IIn Supernova 1997eg
• The Suzaku Observation of the Nucleus of the Radio-Loud Active Galaxy Centaurus A: Constraints on Abundances of the Accreting Material
• Strong Evolution of X-Ray Absorption in the Type IIn Supernova SN 2010jl
• Properties of Newly Formed Dust Grains in The Luminous Type IIn Supernova 2010jl
• Injection and Acceleration of Electrons at A Strong Shock: Radio and X-ray Study of Young Supernova 2011dh
• Long-Lasting X-Ray Emission from Type IIb Supernova 2011dh and Mass-Loss History of The Yellow Supergiant Progenitor
• SN 2005ip: A Luminous Type IIn Supernova Emerging from a Dense Circumstellar Medium as Revealed by X-Ray Observations
• Modeling the X-ray emission of SN 1993J
• Evolving into a remnant: optical observations of SN 1978K at three decades

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