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Asymmetries and Circumstellar Interaction in the Type II SN 2024bch by Andrews, Jennifer E.; Shrestha, Manisha; Bostroem, K. Azalee; Dong, Yize; Pearson, Jeniveve; Fausnaugh, M. M.; Sand, David J.; Valenti, S.; Ravi, Aravind P.; Hoang, Emily; Hosseinzadeh, Griffin; Ilyin, Ilya; Janzen, Daryl; Lundquist, M. J.; Meza, Nicolaz; Smith, Nathan; Jha, Saurabh W.; Andrews, Moira; Farah, Joseph; Gonzalez, Estefania Padilla; Howell, D. Andrew; McCully, Curtis; Newsome, Megan; Pellegrino, Craig; Terreran, Giacomo; Wiggins, Patrick; Hsu, Brian; Christy, Collin T.; Franz, Noah; Wang, Xiofeng; Liu, Jialian; Chen, Liyang is a scholarly article available to read on EtoBox.

What is Asymmetries and Circumstellar Interaction in the Type II SN 2024bch about?

We present a comprehensive multi-epoch photometric and spectroscopic study of SN 2024bch, a nearby (19.9 Mpc) Type II supernova (SN) with prominent early high ionization emission lines. Optical spectra from 2.9 days after the estimated explosion reveal narrow lines of H I, He II, C IV, and N IV that disappear by day 6. High cadence photometry from the ground and TESS show that the SN brightened quickly and reached a peak M$_V \sim$ $-$17.8 mag within a week of explosion, and late-time photometry suggests a $^{56}$Ni mass of 0.050 M$_{\odot}$. High-resolution spectra from day 8 and 43 trace the unshocked circumstellar medium (CSM) and indicate a wind velocity of 30--40 km s$^{-1}$, a value consistent with a red supergiant (RSG) progenitor. Comparisons between models and the early spectra suggest a pre-SN mass-loss rate of $\dot{M} \sim 10^{-3}-10^{-2}\ M_\odot\ \mathrm{yr}^{-1}$, which is too high to be explained by quiescent mass loss from RSGs, but is consistent with some recent measurements of similar SNe. Persistent blueshifted H I and [O I] emission lines seen in the optical and NIR spectra could be produced by asymmetries in the SN ejecta, while the multi-component H$\alpha$ m

Author

Andrews, Jennifer E.; Shrestha, Manisha; Bostroem, K. Azalee; Dong, Yize; Pearson, Jeniveve; Fausnaugh, M. M.; Sand, David J.; Valenti, S.; Ravi, Aravind P.; Hoang, Emily; Hosseinzadeh, Griffin; Ilyin, Ilya; Janzen, Daryl; Lundquist, M. J.; Meza, Nicolaz; Smith, Nathan; Jha, Saurabh W.; Andrews, Moira; Farah, Joseph; Gonzalez, Estefania Padilla; Howell, D. Andrew; McCully, Curtis; Newsome, Megan; Pellegrino, Craig; Terreran, Giacomo; Wiggins, Patrick; Hsu, Brian; Christy, Collin T.; Franz, Noah; Wang, Xiofeng; Liu, Jialian; Chen, Liyang

Published

2024

Language

EN