SN 2019muj – a well-observed Type Iax supernova that bridges the luminosity gap of the class

Barnabás Barna, Tamás Szalai, Saurabh W Jha, Yssavo Camacho-Neves, Lindsey Kwok, Ryan J Foley, Charles D Kilpatrick, David A Coulter, Georgios Dimitriadis, Armin Rest, César Rojas-Bravo, Matthew R Siebert, Peter J Brown, Jamison Burke, Estefania Padilla Gonzalez, Daichi Hiramatsu, D Andrew Howell, Curtis McCully, Craig Pellegrino, Matthew DobsonStephen J Smartt, Jonathan J Swift, Holland Stacey, Mohammed Rahman, David J Sand, Jennifer Andrews, Samuel Wyatt, Eric Y Hsiao, Joseph P Anderson, Ting-Wan Chen, Massimo Della Valle, Lluís Galbany, Mariusz Gromadzki, Cosimo Inserra, Joe Lyman, Mark Magee, Kate Maguire, Tomás E Müller-Bravo, Matt Nicholl, Shubham Srivastav, Steven C Williams

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1 Citation (Scopus)


ABSTRACT We present early-time (t < +50 d) observations of SN 2019muj (=ASASSN-19tr), one of the best-observed members of the peculiar SN Iax class. Ultraviolet and optical photometric and optical and near-infrared spectroscopic follow-up started from ∼5 d before maximum light [tmax(B) on $58707.8$ MJD] and covers the photospheric phase. The early observations allow us to estimate the physical properties of the ejecta and characterize the possible divergence from a uniform chemical abundance structure. The estimated bolometric light-curve peaks at 1.05 × 1042 erg s−1 and indicates that only 0.031 M⊙ of 56Ni was produced, making SN 2019muj a moderate luminosity object in the Iax class with peak absolute magnitude of $M_\rm {V} = -16.4$ mag. The estimated date of explosion is t0 = $58698.2$ MJD and implies a short rise time of trise = 9.6 d in B band. We fit of the spectroscopic data by synthetic spectra, calculated via the radiative transfer code tardis. Adopting the partially stratified abundance template based on brighter SNe Iax provides a good match with SN 2019muj. However, without earlier spectra, the need for stratification cannot be stated in most of the elements, except carbon, which is allowed to appear in the outer layers only. SN 2019muj provides a unique opportunity to link extremely low-luminosity SNe Iax to well-studied, brighter SNe Iax.
Original languageEnglish
Pages (from-to)1078-1099
Number of pages22
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Publication statusPublished - Nov 2020


  • Astronomy and Astrophysics
  • Space and Planetary Science


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