JWST NIRCam Observations of SN 1987A: Spitzer Comparison and Spectral Decomposition

Author:

Arendt Richard G.ORCID,Boyer Martha L.ORCID,Dwek EliORCID,Matsuura MikakoORCID,Ravi Aravind P.ORCID,Rest ArminORCID,Chevalier RogerORCID,Cigan PhilORCID,De Looze IlseORCID,De Marchi GuidoORCID,Fransson ClaesORCID,Gall ChristaORCID,Gehrz R. D.ORCID,Gomez Haley L.ORCID,Kangas TuomasORCID,Kirchschlager FlorianORCID,Kirshner Robert P.ORCID,Larsson JosefinORCID,Lundqvist PeterORCID,Milisavljevic DanORCID,Park SangwookORCID,Smith NathanORCID,Spyromilio JasonORCID,Temim TeaORCID,Wang LifanORCID,Wheeler J. CraigORCID,Woodward Charles E.ORCID

Abstract

Abstract JWST Near Infrared Camera (NIRCam) observations at 1.5–4.5 μm have provided broadband and narrowband imaging of the evolving remnant of SN 1987A with unparalleled sensitivity and spatial resolution. Comparing with previous marginally spatially resolved Spitzer Infrared Array Camera (IRAC) observations from 2004 to 2019 confirms that the emission arises from the circumstellar equatorial ring (ER), and the current brightness at 3.6 and 4.5 μm was accurately predicted by extrapolation of the declining brightness tracked by IRAC. Despite the regular light curve, the NIRCam observations clearly reveal that much of this emission is from a newly developing outer portion of the ER. Spots in the outer ER tend to lie at position angles in between the well-known ER hotspots. We show that the bulk of the emission in the field can be represented by five standard spectral energy distributions, each with a distinct origin and spatial distribution. This spectral decomposition provides a powerful technique for distinguishing overlapping emission from the circumstellar medium and the supernova ejecta, excited by the forward and reverse shocks, respectively.

Funder

National Aeronautics and Space Administration

EC ∣ European Research Council

Villum Fonden

UKRI ∣ Science and Technology Facilities Council

NSF ∣ MPS ∣ Division of Astronomical Sciences

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

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