A Low-Mass Helium Star Progenitor Model for the Type Ibn SN 2020nxt
A Low-Mass Helium Star Progenitor Model for the Type Ibn SN 2020nxt
A growing number of supernovae (SNe) are now known to exhibit evidence for significant interaction with a dense, pre-existing, circumstellar medium (CSM). SNe Ibn comprise one such class that can be characterised by both rapidly evolving light curves and persistent narrow He I lines. The origin of such a dense CSM in these systems remains a pressing question, specifically concerning the progenitor system and mass-loss mechanism. In this paper, we present multi-wavelength data of the Type Ibn SN 2020nxt, including $HST$/STIS ultraviolet spectra. We fit the data with recently updated CMFGEN models designed to handle configurations for SNe Ibn. The UV coverage yields strong constraints on the energetics and, when combined with the CMFGEN models, offer new insight on potential progenitor systems. We find the most successful model is a $\lesssim4 {\rm M}_\odot$ helium star that lost its $\sim 1\,{\rm M}_\odot$ He-rich envelope in the years preceding core collapse. We also consider viable alternatives, such as a He white dwarf merger. Ultimately, we conclude at least some SNe Ibn do not arise from single, massive ($>30 {\rm M}_\odot$) Wolf-Rayet-like stars.
Luc Dessart、Patrick L. Kelly、Curtis McCully、Kenneth C. Chambers、Melissa Shahbandeh、Thomas de Boer、Schuyler D. Van Dyk、Qinan Wang、Kyle W. Davis、WeiKang Zheng、David A. Coulter、Andrew Allan、D. Andrew Howell、Estefania Padilla Gonzalez、Ori D. Fox、Kirsty Taggart、Evelyn Liu、Jamison Burke、Anika Goel、Ryan J. Foley、Alexei V. Filippenko、Erik C. Kool、K. Azalee Bostroem、Matthew R. Siebert、Tam¨￠s Szalai、Mansi M. Kasliwal、Thomas G. Brink、Saurabh W. Jha、Sebastian Gomez、Griffin Hosseinzadeh、Derek Perera、Samaporn Tinyanont、Jose H. Groh、Daichi Hiramatsu、Justin Pierel、V. Ashley Villar、Craig Pellegrino、Mi Dai、Nicholas Earl、Peter Brown、Roger Chevalier、Diego Farias、Geoffrey C. Clayton、Jennifer Andrews、Jesper Sollerman、Emily Ma、Sofia Rest、Armin Rest、Conor L. Ransome、Yukei Murakami、Claes Fransson、C¨|sar Rojas-Bravo、Connor Jennings、Christa Gall、Chelsea Harris、Peter McGill、Nathan Smith、Adam M. Miller
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Luc Dessart,Patrick L. Kelly,Curtis McCully,Kenneth C. Chambers,Melissa Shahbandeh,Thomas de Boer,Schuyler D. Van Dyk,Qinan Wang,Kyle W. Davis,WeiKang Zheng,David A. Coulter,Andrew Allan,D. Andrew Howell,Estefania Padilla Gonzalez,Ori D. Fox,Kirsty Taggart,Evelyn Liu,Jamison Burke,Anika Goel,Ryan J. Foley,Alexei V. Filippenko,Erik C. Kool,K. Azalee Bostroem,Matthew R. Siebert,Tam¨￠s Szalai,Mansi M. Kasliwal,Thomas G. Brink,Saurabh W. Jha,Sebastian Gomez,Griffin Hosseinzadeh,Derek Perera,Samaporn Tinyanont,Jose H. Groh,Daichi Hiramatsu,Justin Pierel,V. Ashley Villar,Craig Pellegrino,Mi Dai,Nicholas Earl,Peter Brown,Roger Chevalier,Diego Farias,Geoffrey C. Clayton,Jennifer Andrews,Jesper Sollerman,Emily Ma,Sofia Rest,Armin Rest,Conor L. Ransome,Yukei Murakami,Claes Fransson,C¨|sar Rojas-Bravo,Connor Jennings,Christa Gall,Chelsea Harris,Peter McGill,Nathan Smith,Adam M. Miller.A Low-Mass Helium Star Progenitor Model for the Type Ibn SN 2020nxt[EB/OL].(2023-05-08)[2025-08-02].https://arxiv.org/abs/2305.05015.点此复制
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