Abstract Details

Name: Anjasha Gangopadhyay
Affiliation: Aryabhatta Research Institute of observational sciencES (ARIES), Nainital, Uttarakhand, India-263001
Conference ID: ASI2021_434
Title : SN 2019wep: Bridging the gap between type Ibn and Ib supernova
Authors and Co-Authors : Anjasha Gangopadhyay (ARIES, Nainital), Kuntal Misra (ARIES, Nainital), Craig Pellegrino (UC Santa Barbara), Xiaofeng Wang (Tsinghua University, Peopleʼs Republic of China), Jun Mo (Tsinghua University, Peopleʼs Republic of China), Raya Dastidar (ARIES, Nainital), D. Andrew Howell (UC Santa Barbara), Diachi Hiramatsu (UC Santa Barbara), Mridweeka Singh (KASI, South Korea), Brijesh Kumar (ARIES, Nainital), S.B. Pandey (ARIES, Nainital)
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : Supernovae (SNe) that are embedded in dense circumstellar medium (CSM) remain an interesting yet unexplored category of transients. We present here, the optical studies of a peculiar SN 2019wep that initially showed narrow emission lines of He (type Ibn) but later on transitioned to a normal type Ib SN. SN 2019wep is also one of the rare type Ibn showing signatures of flash ionisation (\ion{He}{2}, \ion{C}{3}, \ion{N}{3}) features in its early spectra owing to the recombination of CSM. Even though the light curves show decay rates consistent with type Ibn SNe, the colour evolution lies between the type Ibn and extreme type Ib SNe. While the early spectral comparison plots of SN 2019wep shows similarity with type Ibn SNe, the late-time comparison plots shows similarity with other type Ib SNe. SN 2019wep belongs to the ``P~Cygni" sub-class of SNe Ibn and shows faster evolution in velocities compared to the ``emission" sub-class. The predominance of He lines including the transitioning phase hints towards a Wolf-Rayet progenitor scenario for this peculiar SN.