Artificial Intelligence-Assisted Inversion (AIAI) of Synthetic Type Ia Supernova Spectra Academic Article uri icon

abstract

  • Abstract We generate 100,000 model spectra of Type 1a supernovae (SNeIa) to form a spectral library for the purpose of building an artificial intelligenceassisted inversion (AIAI) algorithm for theoretical models. As a first attempt, we restrict our studies to the time around B-band maximum and compute theoretical spectra with a broad spectral wavelength coverage from 2000 to 10000 using the code TARDIS. Based on the library of theoretically calculated spectra, we construct the AIAI algorithm with a multiresidual convolutional neural network to retrieve the contributions of different ionic species to the heavily blended spectral profiles of the theoretical spectra. The AIAI is found to be very powerful in distinguishing spectral patterns due to coupled atomic transitions and has the capacity to quantitatively measure the contributions from different ionic species. By applying the AIAI algorithm to a set of well-observed SNIa spectra, we demonstrate that the model can yield powerful constraints on the chemical structures of these SNeIa. Using the chemical structures deduced from AIAI, we successfully reconstructed the observed data, thus confirming the validity of the method. We show that the light-curve decline rate of SNeIa is correlated with the amount of 56Ni above the photosphere in the ejecta. We detect a clear decrease of 56Ni mass with time that can be attributed to its radioactive decay. Our code and model spectra are available on the websitehttps://github.com/GeronimoChen/AIAI-Supernova.

published proceedings

  • ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES

altmetric score

  • 5.08

author list (cited authors)

  • Chen, X., Hu, L., & Wang, L.

citation count

  • 3

complete list of authors

  • Chen, Xingzhuo||Hu, Lei||Wang, Lifan

publication date

  • September 2020