Type Ibn SN 2019kbj optical LCs and spectra : J/ApJ/946/30

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Authors : Ben-Ami T. orcid , Arcavi I., Newsome M. (hide) , Arcavi I., Newsome M. et..al

VizieR DOI :
Bibcode : 2023ApJ...946...30B (ADS) (Simbad) (Objects)
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CDS Keywords : Supernovae; Photometry; Spectra, optical
UAT : Supernovae, Photometry, Optical astronomy, Spectroscopy

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Inserted into VizieR : 07-Apr-2025
Last modification : 02-Jun-2025

The type Ibn supernova 2019kbj indications for diversity in type Ibn supernova progenitors. (2023)

Keywords : Supernovae ; Core-collapse supernovae ; Massive stars

Abstract:Type Ibn supernovae (SNe) are a rare class of stellar explosions whose progenitor systems are not yet well determined. We present and analyze observations of the Type Ibn SN 2019kbj, and model its light curve in order to constrain its progenitor and explosion parameters. SN 2019kbj shows roughly constant temperature during the first month after peak, indicating a power source (likely circumstellar material interaction) that keeps the continuum emission hot at ~15000K. Indeed, we find that the radioactive decay of 56Ni is disfavored as the sole power source of the bolometric light curve. A radioactive decay + circumstellar material (CSM) interaction model, on the other hand, does reproduce the bolometric emission well. The fits prefer a uniform-density CSM ...(more)
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We obtained BVgri-band imaging of SN 2019kbj with the Las Cumbres Observatory (LCO) Sinistro cameras mounted on the network of 1m telescopes at the Cerro Tololo Inter-American Observatory (Chile), the South African Astronomical Observatory (South Africa), the Siding Spring Observatory (Australia), and the McDonald Observatory (United States), through the Global Supernova Project, from 2019 July 4 to 2019 September 20. Reference images were obtained on 2021 December 31, long after the SN faded. BV-band magnitudes are calibrated to the Vega system, and gri-band magnitudes to the AB system. We also obtained c- and o-band host-subtracted photometry of SN2019kbj from the ATLAS Forced Photometry Server. We find the last pre-explosion ATLAS 5{sigma} nondetection limit to be on 2019 June 29 at a magnitude of 19.89 in the c band, constraining the explosion time to a window of only 2 days between 2019 June 29 and 2019 July 1. We downloaded images of SN 2019kbj taken by the Ultraviolet Optical Telescope (UVOT) on board the Neil Gehrels Swift Observatory, obtained under a Target of Opportunity request (PI: Hiramatsu), from the High Energy Astrophysics Science Archive Research Center (HEASARC). We obtained 12 spectroscopic observations with the Las Cumbres Observatory Floyds spectrographs mounted on the 2m Faulkes Telescope North (FTN) and South (FTS) at the Haleakala (United States) and Siding Spring (Australia) observatories, respectively, through the Global Supernova Project. 


                


                

                    

                


                

                    

                


                

                    
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