Early and Extensive Ultraviolet through Near Infrared Observations of the Intermediate-luminosity Type Iax Supernovae 2024pxl

Early and Extensive Ultraviolet through Near Infrared Observations of the Intermediate-luminosity Type Iax Supernovae 2024pxl

We present ultraviolet (UV) through near-infrared (NIR) photometric and spectroscopic observations of the nearby SN 2024pxl, the third Type Ia supernova (SN Ia) in NGC 6384. SN 2024pxl is a Type Iax supernova (SN Iax) with an intermediate luminosity ( M _r  = −16.99 ± 0.32 mag) and an average SN Iax...

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Bibliographic Details
Main Authors: W. B. Hoogendam, C. Ashall, D. O. Jones, B. J. Shappee, M. A. Tucker, M. E. Huber, K. Auchettl, D. D. Desai, A. Do, J. T. Hinkle, M. Y. Kong, S. Romagnoli, J. Shi, A. Syncatto, C. D. Kilpatrick
Format: Article
Language:English
Published: IOP Publishing 2025-01-01
Series:The Astrophysical Journal
Subjects:
Type Ia supernovae
Near infrared astronomy
Online Access:https://doi.org/10.3847/1538-4357/ade787
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Summary:We present ultraviolet (UV) through near-infrared (NIR) photometric and spectroscopic observations of the nearby SN 2024pxl, the third Type Ia supernova (SN Ia) in NGC 6384. SN 2024pxl is a Type Iax supernova (SN Iax) with an intermediate luminosity ( M _r  = −16.99 ± 0.32 mag) and an average SN Iax light curve decline rate. SN 2024pxl was discovered ∼3 days after first light, and the rising light curve follows a single power law that is inconsistent with significant interaction with a companion star or circumstellar material. Our extensive NIR photometric coverage is comparable to that of the well-observed SNe Iax 2005hk and 2012Z, and we demonstrate that the J  −  H colors of SNe Iax differ from normal SNe Ia and appear to be more homogeneous as a class. Spectroscopically, we report the earliest-ever NIR spectrum of an SN Iax as measured from maximum light ( t  ≈ −9 days): a featureless continuum with similarities to a ∼9000 K blackbody, and the line velocities are consistent with a mixed-ejecta structure, with C, Si, and Fe having similar velocities and velocity evolutions. We find a tentative correlation between the H -band break Co ii velocity ∼20 days post-peak and absolute magnitude, with more luminous SNe Iax showing faster Co ii velocities. Our observations suggest that SN 2024pxl resulted from the thermonuclear disruption of a CO white dwarf star that undergoes deflagration burning.
ISSN:1538-4357

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