| Title: |
Early and Extensive Ultraviolet through Near Infrared Observations of the Intermediate-luminosity Type Iax Supernovae 2024pxl |
| Authors: |
Hoogendam, WB; Ashall, C; Jones, DO; Shappee, BJ; Tucker, MA; Huber, ME; Auchettl, K; Desai, DD; Do, A; Hinkle, JT; Kong, MY; Romagnoli, S; Shi, J; Syncatto, A; Kilpatrick, CD |
| Publisher Information: |
American Astronomical Society |
| Publication Year: |
2025 |
| Collection: |
The University of Melbourne: Digital Repository |
| Description: |
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. |
| Document Type: |
article in journal/newspaper |
| Language: |
unknown |
| ISSN: |
0004-637X |
| Relation: |
https://hdl.handle.net/11343/364305 |
| Availability: |
https://hdl.handle.net/11343/364305 |
| Rights: |
https://creativecommons.org/licenses/by/4.0/ ; CC-BY |
| Accession Number: |
edsbas.D732FCCD |
| Database: |
BASE |