Newly Formed Dust within the Circumstellar Environment of SNIa-CSM 2018evt
Abstract
Dust associated with various stellar sources in galaxies at all cosmic epochs remains a controversial topic, particularly whether supernovae (SNe) play an important role in dust production. We report evidence of dust formation in the cold, dense shell behind the ejecta-circumstellar medium (CSM) interaction in the Type Ia-CSM SN 2018evt three years after the explosion, characterized by a rise in the mid-infrared (MIR) emission accompanied by an accelerated decline in the optical radiation of the SN. Such a dust-formation picture is also corroborated by the concurrent evolution of the profiles of the Ha emission line. Our model suggests enhanced CSM dust concentration at increasing distances from the SN as compared to what can be expected from the density profile of the mass loss from a steady stellar wind. By the time of the last MIR observations at day +1041, a total amount of 1.2+-0.2x10^{-2} Msun of new dust has been formed by SN 2018evt, making SN 2018evt one of the most prolific dust factories among SNe with evidence of dust formation. The unprecedented witness of the intense production procedure of dust may shed light on the perceptions of dust formation in cosmic history.
Cite
@article{arxiv.2310.14874,
title = {Newly Formed Dust within the Circumstellar Environment of SNIa-CSM 2018evt},
author = {Lingzhi Wang and Maokai Hu and Lifan Wang and Yi Yang and Jiawen Yang and Haley Gomez and Sijie Chen and Lei Hu and Ting-Wan Chen and Jun Mo and Xiaofeng Wang and Dietrich Baade and Peter Hoeflich and J. Craig Wheeler and Giuliano Pignata and Jamison Burke and Daichi Hiramatsu and D. Andrew Howell and Curtis McCully and Craig Pellegrino and Lluís Galbany and Eric Y. Hsiao and David J. Sand and Jujia Zhang and Syed A Uddin and J. P. Anderson and Chris Ashall and Cheng Cheng and Mariusz Gromadzki and Cosimo Inserra and Han Lin and N. Morrell and Antonia Morales-Garoffolo and T. E. M üller-Bravo and Matt Nicholl and Estefania Padilla Gonzalez and M. M. Phillips and J. Pineda-García and Hanna Sai and Mathew Smith and M. Shahbandeh and Shubham Srivastav and M. D. Stritzinger and Sheng Yang and D. R. Young and Lixin Yu and Xinghan Zhang},
journal= {arXiv preprint arXiv:2310.14874},
year = {2024}
}
Comments
Accepted by Nature Astronomy, 6 main figures, 7 extended figures, and 2 extended tables