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SN 2019vxm: A Shocking Coincidence between Fermi and TESS
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DOI：10.3847/1538-4357/ae6245.png)
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Abstract
En 中文
Shock breakout and, in some cases, jet-driven high-energy emission are increasingly recognized as key signatures of the earliest phases of core-collapse supernovae, especially in Type IIn systems due to their dense, interaction-dominated circumstellar environments. We present a comprehensive photometric analysis of SN 2019vxm, a long-duration, luminous Type IIn supernova, MV=-21.41 +/- 0.05mag , observed from X-ray to near-infrared. SN 2019vxm is the first superluminous supernovae Type IIn to be caught with well-sampled TESS photometric data on the rise and has a convincing coincident X-ray source at the time of first light. The high-cadence TESS light curve captures the early-time rise, which is well described by a broken power law with an index of n = 1.41 +/- 0.04, significantly shallower than the canonical n = 2 behavior. From this, we constrain the time of first light to within 7.2 hr. We identify a spatial and temporal coincidence between SN 2019vxm and the hard X-ray/gamma-ray transient GRB 191117A, corresponding to a 3.3 sigma association confidence. Both the short-duration X-ray event and the lightcurve modeling are consistent with shock breakout into a dense, asymmetric circumstellar medium, indicative of a massive, compact progenitor such as a luminous blue variable transitioning to Wolf-Rayet phase embedded in a clumpy, asymmetric environment.
Keywords:
RAY BURST CATALOG
DENSE CIRCUMSTELLAR MEDIUM
EARLY LIGHT CURVES
IIN SUPERNOVA
X-RAY
SUPERLUMINOUS SUPERNOVAE
IA SUPERNOVA
NUMERICAL SIMULATIONS
LUMINOUS SUPERNOVA
ANALYTIC SOLUTIONS
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5.4
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32.0W
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