SN 2019vxm: A Shocking Coincidence between Fermi and TESS
Year: 2025
Type: article
Abstract: 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, $M_V^{}=-21.41\pm0.05\;{\rm mag}$, 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 $n=1.41\pm0.04$, significantly shallower than the canonical $n=2$ behavior. From this, we constrain the time of first light to within 7.2 hours. We identify a spatial and temporal coincidence between SN 2019vxm and the X-ray transient GRB191117A, corresponding to a $3.3?$ 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.
DOI: 10.13016/m2n9xw-igim
Authors: Lane, Zachary G., Ridden-Harper, Ryan, Rest, Sofia, Rest, Armin, Ransome, Conor L., Wang, Qinan, Montilla, Clarinda, Steed, Micaela, Andreoni, Igor, Armstrong, Patrick, Brown, Peter J., Cooke, Jeffrey, Coulter, David A., Fox, Ori, Freeburn, James, Galoppo, Marco, Gal-Yam, Avishay, Goldberg, Jared A., Harvey-Hawes, Christopher, Hounsell, Rebekah, Leicester, Brayden, Linial, Itai, Moore, Thomas, Mourier, Pierre, Nugent, Anya E., O'Neill, David, Roxburgh, Hugh, Shukawa, Koji, Smartt, Stephen J., Smith, Nathan, Smith, Ken W., Carrasco, Sebastian Vergara, Villar, V. Ashley, Wasserman, Tal, Yossef, Zenati, Zimmerman, Erez
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7119512534
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