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A Swift Look at SN 2011fe: The Earliest Ultraviolet Observations of a Type Ia Supernova

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arxiv 1110.2538 v2 pith:RHG66CRB submitted 2011-10-12 astro-ph.CO

A Swift Look at SN 2011fe: The Earliest Ultraviolet Observations of a Type Ia Supernova

Peter J. Brown , Kyle S. Dawson , Massimiliano de Pasquale , Caryl Gronwall , Stephen Holland , Stefan Immler , Paul Kuin , Paolo Mazzali
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Peter Milne Samantha Oates Michael Siegel
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classification astro-ph.CO
keywords earlyexplosionobservationscompanioncurvesdistanceearliestfind
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We present the earliest ultraviolet (UV) observations of the bright Type Ia supernova SN 2011fe/PTF11kly in the nearby galaxy M101 at a distance of only 6.4 Mpc. It was discovered shortly after explosion by the Palomar Transient Factory and first observed by Swift/UVOT about a day after explosion. The early UV light is well-defined, with ~20 data points per filter in the five days after explosion. These early and well-sampled UV observations form new template light curves for comparison with observations of other SNe Ia at low and high redshift. We report fits from semi-empirical models of the explosion and find the time evolution of the early UV flux to be well fit by the superposition of two parabolic curves. Finally, we use the early UV flux measurements to examine a possible shock interaction with a non-degenerate companion. From models predicting the measurable shock emission, we find that even a solar mass companion at a distance of a few solar radii is unlikely at more than 95% confidence.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. ZTF SN Ia DR2 follow-up: early excess in Type Ia supernova light curves

    astro-ph.CO 2026-07 conditional novelty 5.0

    Up to about a quarter of Type Ia supernovae may have an early light-curve bump, but the candidate list depends strongly on the detection method and neither leading explosion model is clearly preferred.

  2. Optical observations on the young Type Ia SN 2021fxy with detached high velocity features

    astro-ph.HE 2026-07 conditional novelty 5.0

    In SN 2021fxy, the high-velocity Si II λ6355 absorption declines as roughly t^−0.1, much shallower than the t^−0.22 expected from standard outer ejecta, pointing to detached density structures.