SN 2020jgb: A Peculiar Type Ia Supernova Triggered by a Helium-shell Detonation in a Star-forming Galaxy
The detonation of a thin (≲0.03 M _⊙ ) helium shell (He-shell) atop a ∼1 M _⊙ white dwarf (WD) is a promising mechanism to explain normal Type Ia supernovae (SNe Ia), while thicker He-shells and less massive WDs may explain some recently observed peculiar SNe Ia. We present observations of SN 2020jg...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acbb5e |
| _version_ | 1797701380746510336 |
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| author | Chang Liu Adam A. Miller Abigail Polin Anya E. Nugent Kishalay De Peter E. Nugent Steve Schulze Avishay Gal-Yam Christoffer Fremling Shreya Anand Igor Andreoni Peter Blanchard Thomas G. Brink Suhail Dhawan Alexei V. Filippenko Kate Maguire Tassilo Schweyer Huei Sears Yashvi Sharma Matthew J. Graham Steven L. Groom David Hale Mansi M. Kasliwal Frank J. Masci Josiah Purdum Benjamin Racine Jesper Sollerman Shrinivas R. Kulkarni |
| author_facet | Chang Liu Adam A. Miller Abigail Polin Anya E. Nugent Kishalay De Peter E. Nugent Steve Schulze Avishay Gal-Yam Christoffer Fremling Shreya Anand Igor Andreoni Peter Blanchard Thomas G. Brink Suhail Dhawan Alexei V. Filippenko Kate Maguire Tassilo Schweyer Huei Sears Yashvi Sharma Matthew J. Graham Steven L. Groom David Hale Mansi M. Kasliwal Frank J. Masci Josiah Purdum Benjamin Racine Jesper Sollerman Shrinivas R. Kulkarni |
| author_sort | Chang Liu |
| collection | DOAJ |
| description | The detonation of a thin (≲0.03 M _⊙ ) helium shell (He-shell) atop a ∼1 M _⊙ white dwarf (WD) is a promising mechanism to explain normal Type Ia supernovae (SNe Ia), while thicker He-shells and less massive WDs may explain some recently observed peculiar SNe Ia. We present observations of SN 2020jgb, a peculiar SN Ia discovered by the Zwicky Transient Facility (ZTF). Near maximum brightness, SN 2020jgb is slightly subluminous (ZTF g -band absolute magnitude −18.7 mag ≲ M _g ≲ −18.2 mag depending on the amount of host-galaxy extinction) and shows an unusually red color (0.2 mag ≲ g _ZTF − r _ZTF ≲ 0.4 mag) due to strong line-blanketing blueward of ∼5000 Å. These properties resemble those of SN 2018byg, a peculiar SN Ia consistent with an He-shell double detonation (DDet) SN. Using detailed radiative transfer models, we show that the optical spectroscopic and photometric evolution of SN 2020jgb is broadly consistent with a ∼0.95–1.00 M _⊙ (C/O core + He-shell) progenitor ignited by a ≳0.1 M _⊙ He-shell. However, one-dimensional radiative transfer models without non-local-thermodynamic-equilibrium treatment cannot accurately characterize the line-blanketing features, making the actual shell mass uncertain. We detect a prominent absorption feature at ∼1 μ m in the near-infrared (NIR) spectrum of SN 2020jgb, which might originate from unburnt helium in the outermost ejecta. While the sample size is limited, we find similar 1 μ m features in all the peculiar He-shell DDet candidates with NIR spectra obtained to date. SN 2020jgb is also the first peculiar He-shell DDet SN discovered in a star-forming dwarf galaxy, indisputably showing that He-shell DDet SNe occur in both star-forming and passive galaxies, consistent with the normal SN Ia population. |
| first_indexed | 2024-03-12T04:34:40Z |
| format | Article |
| id | doaj.art-3583235aa2bb48c2a7b12078324a7794 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:34:40Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-3583235aa2bb48c2a7b12078324a77942023-09-03T09:56:32ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194628310.3847/1538-4357/acbb5eSN 2020jgb: A Peculiar Type Ia Supernova Triggered by a Helium-shell Detonation in a Star-forming GalaxyChang Liu0https://orcid.org/0000-0002-7866-4531Adam A. Miller1https://orcid.org/0000-0001-9515-478XAbigail Polin2https://orcid.org/0000-0002-1633-6495Anya E. Nugent3https://orcid.org/0000-0002-2028-9329Kishalay De4https://orcid.org/0000-0002-8989-0542Peter E. Nugent5https://orcid.org/0000-0002-3389-0586Steve Schulze6https://orcid.org/0000-0001-6797-1889Avishay Gal-Yam7https://orcid.org/0000-0002-3653-5598Christoffer Fremling8https://orcid.org/0000-0002-4223-103XShreya Anand9https://orcid.org/0000-0003-3768-7515Igor Andreoni10https://orcid.org/0000-0002-8977-1498Peter Blanchard11https://orcid.org/0000-0003-0526-2248Thomas G. Brink12https://orcid.org/0000-0001-5955-2502Suhail Dhawan13https://orcid.org/0000-0002-2376-6979Alexei V. Filippenko14https://orcid.org/0000-0003-3460-0103Kate Maguire15https://orcid.org/0000-0002-9770-3508Tassilo Schweyer16https://orcid.org/0000-0001-8948-3456Huei Sears17https://orcid.org/0000-0001-8023-4912Yashvi Sharma18https://orcid.org/0000-0003-4531-1745Matthew J. Graham19https://orcid.org/0000-0002-3168-0139Steven L. Groom20https://orcid.org/0000-0001-5668-3507David Hale21Mansi M. Kasliwal22https://orcid.org/0000-0002-5619-4938Frank J. Masci23https://orcid.org/0000-0002-8532-9395Josiah Purdum24https://orcid.org/0000-0003-1227-3738Benjamin Racine25https://orcid.org/0000-0001-8861-3052Jesper Sollerman26https://orcid.org/0000-0003-1546-6615Shrinivas R. Kulkarni27https://orcid.org/0000-0001-5390-8563Department of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, USA ; ptg.cliu@u.northwestern.edu; Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University , 1800 Sherman Ave, Evanston, IL 60201, USADepartment of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, USA ; ptg.cliu@u.northwestern.edu; Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University , 1800 Sherman Ave, Evanston, IL 60201, USAThe Observatories of the Carnegie Institution for Science , 813 Santa Barbara Street, Pasadena, CA 91101, USA; TAPIR, Walter Burke Institute for Theoretical Physics , 350-17, Caltech, Pasadena, CA 91125, USADepartment of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, USA ; ptg.cliu@u.northwestern.edu; Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University , 1800 Sherman Ave, Evanston, IL 60201, USAMIT-Kavli Institute for Astrophysics and Space Research , 77 Massachusetts Avenue, Cambridge, MA 02139, USADepartment of Astronomy, University of California , Berkeley, CA 94720-3411, USA; Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA, 94720, USAThe Oskar Klein Centre, Department of Physics, Stockholm University , Albanova University Center, SE-106 91 Stockholm, SwedenDepartment of Particle Physics and Astrophysics, Weizmann Institute of Science , 76100 Rehovot, IsraelCaltech Optical Observatories, California Institute of Technology , Pasadena, CA 91125, USA; Division of Physics, Mathematics, and Astronomy, California Institute of Technology , Pasadena, CA 91125, USACahill Center for Astrophysics, California Institute of Technology , Pasadena CA 91125, USAJoint Space-Science Institute, University of Maryland , College Park, MD 20742, USA; Department of Astronomy, University of Maryland , College Park, MD 20742, USA; Astrophysics Science Division, NASA Goddard Space Flight Center , Mail Code 661, Greenbelt, MD 20771, USACenter for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University , 1800 Sherman Ave, Evanston, IL 60201, USADepartment of Astronomy, University of California , Berkeley, CA 94720-3411, USAInstitute of Astronomy and Kavli Institute for Cosmology, University of Cambridge , Madingley Road, Cambridge CB3 0HA, UKDepartment of Astronomy, University of California , Berkeley, CA 94720-3411, USASchool of Physics, Trinity College Dublin, The University of Dublin , Dublin 2, IrelandThe Oskar Klein Centre, Department of Astronomy, Stockholm University , AlbaNova, SE-106 91 Stockholm, SwedenDepartment of Physics and Astronomy, Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, USA ; ptg.cliu@u.northwestern.edu; Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University , 1800 Sherman Ave, Evanston, IL 60201, USADivision of Physics, Mathematics, and Astronomy, California Institute of Technology , Pasadena, CA 91125, USADivision of Physics, Mathematics, and Astronomy, California Institute of Technology , Pasadena, CA 91125, USAIPAC, California Institute of Technology , 1200 E. California Boulevard, Pasadena, CA 91125, USACaltech Optical Observatories, California Institute of Technology , Pasadena, CA 91125, USADivision of Physics, Mathematics, and Astronomy, California Institute of Technology , Pasadena, CA 91125, USAIPAC, California Institute of Technology , 1200 E. California Boulevard, Pasadena, CA 91125, USACaltech Optical Observatories, California Institute of Technology , Pasadena, CA 91125, USAAix Marseille Univ , CNRS/IN2P3, CPPM, Marseille, FranceThe Oskar Klein Centre, Department of Astronomy, Stockholm University , AlbaNova, SE-106 91 Stockholm, SwedenDivision of Physics, Mathematics, and Astronomy, California Institute of Technology , Pasadena, CA 91125, USAThe detonation of a thin (≲0.03 M _⊙ ) helium shell (He-shell) atop a ∼1 M _⊙ white dwarf (WD) is a promising mechanism to explain normal Type Ia supernovae (SNe Ia), while thicker He-shells and less massive WDs may explain some recently observed peculiar SNe Ia. We present observations of SN 2020jgb, a peculiar SN Ia discovered by the Zwicky Transient Facility (ZTF). Near maximum brightness, SN 2020jgb is slightly subluminous (ZTF g -band absolute magnitude −18.7 mag ≲ M _g ≲ −18.2 mag depending on the amount of host-galaxy extinction) and shows an unusually red color (0.2 mag ≲ g _ZTF − r _ZTF ≲ 0.4 mag) due to strong line-blanketing blueward of ∼5000 Å. These properties resemble those of SN 2018byg, a peculiar SN Ia consistent with an He-shell double detonation (DDet) SN. Using detailed radiative transfer models, we show that the optical spectroscopic and photometric evolution of SN 2020jgb is broadly consistent with a ∼0.95–1.00 M _⊙ (C/O core + He-shell) progenitor ignited by a ≳0.1 M _⊙ He-shell. However, one-dimensional radiative transfer models without non-local-thermodynamic-equilibrium treatment cannot accurately characterize the line-blanketing features, making the actual shell mass uncertain. We detect a prominent absorption feature at ∼1 μ m in the near-infrared (NIR) spectrum of SN 2020jgb, which might originate from unburnt helium in the outermost ejecta. While the sample size is limited, we find similar 1 μ m features in all the peculiar He-shell DDet candidates with NIR spectra obtained to date. SN 2020jgb is also the first peculiar He-shell DDet SN discovered in a star-forming dwarf galaxy, indisputably showing that He-shell DDet SNe occur in both star-forming and passive galaxies, consistent with the normal SN Ia population.https://doi.org/10.3847/1538-4357/acbb5eSupernovaeType Ia supernovaeWhite dwarf starsObservational astronomySurveys |
| spellingShingle | Chang Liu Adam A. Miller Abigail Polin Anya E. Nugent Kishalay De Peter E. Nugent Steve Schulze Avishay Gal-Yam Christoffer Fremling Shreya Anand Igor Andreoni Peter Blanchard Thomas G. Brink Suhail Dhawan Alexei V. Filippenko Kate Maguire Tassilo Schweyer Huei Sears Yashvi Sharma Matthew J. Graham Steven L. Groom David Hale Mansi M. Kasliwal Frank J. Masci Josiah Purdum Benjamin Racine Jesper Sollerman Shrinivas R. Kulkarni SN 2020jgb: A Peculiar Type Ia Supernova Triggered by a Helium-shell Detonation in a Star-forming Galaxy The Astrophysical Journal Supernovae Type Ia supernovae White dwarf stars Observational astronomy Surveys |
| title | SN 2020jgb: A Peculiar Type Ia Supernova Triggered by a Helium-shell Detonation in a Star-forming Galaxy |
| title_full | SN 2020jgb: A Peculiar Type Ia Supernova Triggered by a Helium-shell Detonation in a Star-forming Galaxy |
| title_fullStr | SN 2020jgb: A Peculiar Type Ia Supernova Triggered by a Helium-shell Detonation in a Star-forming Galaxy |
| title_full_unstemmed | SN 2020jgb: A Peculiar Type Ia Supernova Triggered by a Helium-shell Detonation in a Star-forming Galaxy |
| title_short | SN 2020jgb: A Peculiar Type Ia Supernova Triggered by a Helium-shell Detonation in a Star-forming Galaxy |
| title_sort | sn 2020jgb a peculiar type ia supernova triggered by a helium shell detonation in a star forming galaxy |
| topic | Supernovae Type Ia supernovae White dwarf stars Observational astronomy Surveys |
| url | https://doi.org/10.3847/1538-4357/acbb5e |
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