Wang, Lingzhi and Hu, Maokai and Wang, Lifan and Yang, Yi and Yang, Jiawen and Gomez, Haley and Chen, Sijie and Hu, Lei and Chen, Ting-Wan and Mo, Jun and Wang, Xiaofeng and Baade, Dietrich and Hoeflich, Peter and Wheeler, J. Craig and Pignata, Giuliano and Burke, Jamison and Hiramatsu, Daichi and Howell, D. Andrew and McCully, Curtis and Pellegrino, Craig and Galbany, Lluís and Hsiao, Eric Y. and Sand, David J. and Zhang, Jujia and Uddin, Syed A. and Anderson, J. P. and Ashall, Chris and Cheng, Cheng and Gromadzki, Mariusz and Inserra, Cosimo and Lin, Han and Morrell, N. and Morales-Garoffolo, Antonia and Müller-Bravo, T. E. and Nicholl, Matt and Gonzalez, Estefania Padilla and Phillips, M. M. and Pineda-García, J. and Sai, Hanna and Smith, Mathew and Shahbandeh, M. and Srivastav, Shubham and Stritzinger, M. D. and Yang, Sheng and Young, D. R. and Yu, Lixin and Zhang, Xinghan (2024) Newly formed dust within the circumstellar environment of SN Ia-CSM 2018evt. Nature Astronomy, 8. pp. 504-509. ISSN 2397-3366
Full text not available from this repository.Abstract
Dust associated with various stellar sources in galaxies at all cosmic epochs remains a controversial topic, particularly whether supernovae 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 supernova (SN) 2018evt three years after the explosion, characterized by a rise in mid-infrared 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 Hα 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 mid-infrared observations at day +1,041, a total amount of 1.2 ± 0.2 × 10−2 M⊙ of new dust has been formed by SN 2018evt, making SN 2018evt one of the most prolific dust factories among supernovae 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....