The Astrophysical Journal (Jan 2023)
SN 2022joj: A Peculiar Type Ia Supernova Possibly Driven by an Asymmetric Helium-shell Double Detonation
- Chang Liu,
- Adam A. Miller,
- Samuel J. Boos,
- Ken J. Shen,
- Dean M. Townsley,
- Steve Schulze,
- Luke Harvey,
- Kate Maguire,
- Joel Johansson,
- Thomas G. Brink,
- Umut Burgaz,
- Georgios Dimitriadis,
- Alexei V. Filippenko,
- Saarah Hall,
- K-Ryan Hinds,
- Andrew Hoffman,
- Viraj Karambelkar,
- Charles D. Kilpatrick,
- Daniel Perley,
- Neil Pichay,
- Huei Sears,
- Jesper Sollerman,
- Robert Stein,
- Jacco H. Terwel,
- WeiKang Zheng,
- Matthew J. Graham,
- Mansi M. Kasliwal,
- Leander Lacroix,
- Josiah Purdum,
- Benjamin Rusholme,
- Avery Wold
Affiliations
- Chang Liu
- ORCiD
- Department of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, USA; Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University , 1800 Sherman Avenue, Evanston, IL 60201, USA
- Adam A. Miller
- ORCiD
- Department of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, USA; Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University , 1800 Sherman Avenue, Evanston, IL 60201, USA
- Samuel J. Boos
- ORCiD
- Department of Physics & Astronomy, University of Alabama , Tuscaloosa, AL, USA
- Ken J. Shen
- ORCiD
- Department of Astronomy and Theoretical Astrophysics Center, University of California , Berkeley, CA 94720-3411, USA
- Dean M. Townsley
- ORCiD
- Department of Physics & Astronomy, University of Alabama , Tuscaloosa, AL, USA
- Steve Schulze
- ORCiD
- The Oskar Klein Centre, Department of Physics, Stockholm University , Albanova University Center, SE-106 91 Stockholm, Sweden
- Luke Harvey
- ORCiD
- School of Physics, Trinity College Dublin, The University of Dublin , Dublin 2, Ireland
- Kate Maguire
- ORCiD
- School of Physics, Trinity College Dublin, The University of Dublin , Dublin 2, Ireland
- Joel Johansson
- ORCiD
- The Oskar Klein Centre, Department of Physics, Stockholm University , Albanova University Center, SE-106 91 Stockholm, Sweden
- Thomas G. Brink
- ORCiD
- Department of Astronomy, University of California , Berkeley, CA 94720-3411, USA
- Umut Burgaz
- ORCiD
- School of Physics, Trinity College Dublin, The University of Dublin , Dublin 2, Ireland
- Georgios Dimitriadis
- ORCiD
- School of Physics, Trinity College Dublin, The University of Dublin , Dublin 2, Ireland
- Alexei V. Filippenko
- ORCiD
- Department of Astronomy, University of California , Berkeley, CA 94720-3411, USA
- Saarah Hall
- ORCiD
- Department of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, USA; Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University , 1800 Sherman Avenue, Evanston, IL 60201, USA
- K-Ryan Hinds
- ORCiD
- Astrophysics Research Institute, Liverpool John Moores University , Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF, UK
- Andrew Hoffman
- ORCiD
- Institute for Astronomy, University of Hawaií at Manoa , 2680 Woodlawn Drive, Honolulu, HI 96822, USA
- Viraj Karambelkar
- ORCiD
- Division of Physics, Mathematics and Astronomy, California Institute of Technology , Pasadena, CA 91125, USA
- Charles D. Kilpatrick
- ORCiD
- Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University , 1800 Sherman Avenue, Evanston, IL 60201, USA
- Daniel Perley
- ORCiD
- Astrophysics Research Institute, Liverpool John Moores University , Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF, UK
- Neil Pichay
- ORCiD
- Department of Astronomy, University of California , Berkeley, CA 94720-3411, USA
- Huei Sears
- ORCiD
- Department of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, USA; Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University , 1800 Sherman Avenue, Evanston, IL 60201, USA
- Jesper Sollerman
- ORCiD
- The Oskar Klein Center, Department of Astronomy, Stockholm University , Albanova University Center, SE-106 91 Stockholm, Sweden
- Robert Stein
- ORCiD
- Division of Physics, Mathematics and Astronomy, California Institute of Technology , Pasadena, CA 91125, USA
- Jacco H. Terwel
- ORCiD
- School of Physics, Trinity College Dublin, The University of Dublin , Dublin 2, Ireland; Isaac Newton Group (ING), Apt. de correos 321, E-38700, Santa Cruz de La Palma, Canary Islands, Spain
- WeiKang Zheng
- ORCiD
- Department of Astronomy, University of California , Berkeley, CA 94720-3411, USA
- Matthew J. Graham
- ORCiD
- Division of Physics, Mathematics and Astronomy, California Institute of Technology , Pasadena, CA 91125, USA
- Mansi M. Kasliwal
- ORCiD
- Division of Physics, Mathematics and Astronomy, California Institute of Technology , Pasadena, CA 91125, USA
- Leander Lacroix
- ORCiD
- The Oskar Klein Centre, Department of Physics, Stockholm University , Albanova University Center, SE-106 91 Stockholm, Sweden; LPNHE, CNRS/IN2P3, Sorbonne Université , Université Paris-Cité, Laboratoire de Physique Nucléaire et de Hautes Énergies, 75005 Paris, France
- Josiah Purdum
- ORCiD
- Caltech Optical Observatories, California Institute of Technology , Pasadena, CA 91125, USA
- Benjamin Rusholme
- ORCiD
- IPAC, California Institute of Technology , 1200 E. California Boulevard, Pasadena, CA 91125, USA
- Avery Wold
- ORCiD
- IPAC, California Institute of Technology , 1200 E. California Boulevard, Pasadena, CA 91125, USA
- DOI
- https://doi.org/10.3847/1538-4357/acffc9
- Journal volume & issue
-
Vol. 958,
no. 2
p. 178
Abstract
We present observations of SN 2022joj, a peculiar Type Ia supernova discovered by the Zwicky Transient Facility. SN 2022joj exhibits an unusually red g _ZTF − r _ZTF color at early times and a rapid blueward evolution afterward. Around maximum brightness, SN 2022joj shows a high luminosity ( ${M}_{{g}_{\mathrm{ZTF}},\max }\simeq -19.7$ mag), a blue broadband color ( g _ZTF − r _ZTF ≃ −0.2 mag), and shallow Si ii absorption lines, consistent with those of overluminous, SN 1991T-like events. The maximum-light spectrum also shows prominent absorption around 4200 Å, which resembles the Ti ii features in subluminous, SN 1991bg-like events. Despite the blue optical-band colors, SN 2022joj exhibits extremely red ultraviolet minus optical colors at maximum luminosity ( u − v ≃ 0.6 mag and uvw 1 − v ≃ 2.5 mag), suggesting a suppression of flux at ∼2500–4000 Å. Strong C ii lines are also detected at peak. We show that these unusual spectroscopic properties are broadly consistent with the helium-shell double detonation of a sub-Chandrasekhar mass ( M ≃ 1 M _⊙ ) carbon/oxygen white dwarf from a relatively massive helium shell ( M _s ≃ 0.04–0.1 M _⊙ ), if observed along a line of sight roughly opposite to where the shell initially detonates. None of the existing models could quantitatively explain all the peculiarities observed in SN 2022joj. The low flux ratio of [Ni ii ] λ 7378 to [Fe ii ] λ 7155 emission in the late-time nebular spectra indicates a low yield of stable Ni isotopes, favoring a sub-Chandrasekhar mass progenitor. The significant blueshift measured in the [Fe ii ] λ 7155 line is also consistent with an asymmetric chemical distribution in the ejecta, as is predicted in double-detonation models.
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