CaltechAUTHORS
Published March 20, 2023 | Version Published
Journal Article Open

The Origin and Evolution of the Normal Type Ia SN 2018aoz with Infant-phase Reddening and Excess Emission

Creators

  • 1. ROR icon University of Toronto
  • 2. ROR icon Carnegie Observatories
  • 3. ROR icon California Institute of Technology
  • 4. ROR icon University of Arizona
  • 5. ROR icon University of Lisbon
  • 6. ROR icon Korea Astronomy and Space Science Institute
  • 7. ROR icon Korea University of Science and Technology
  • 8. ROR icon Chungnam National University
  • 9. ROR icon University of California, Santa Barbara
  • 10. ROR icon Las Cumbres Observatory Global Telescope Network
  • 11. ROR icon Lawrence Berkeley National Laboratory
  • 12. ROR icon University of California, Berkeley
  • 13. ROR icon Texas A&M University
  • 14. ROR icon Institute of Space Sciences
  • 15. ROR icon Institut d'Estudis Espacials de Catalunya
  • 16. ROR icon Harvard-Smithsonian Center for Astrophysics
  • 17. ROR icon AI Institute for Artificial Intelligence and Fundamental Interactions
  • 18. ROR icon University of California, Davis
  • 19. ROR icon FORTH Institute of Astrophysics
  • 20. ROR icon Max Planck Institute for Radio Astronomy
  • 21. ROR icon University of Bonn
  • 22. ROR icon Princeton University
  • 23. ROR icon University of Washington
  • 24. ROR icon University of Maryland, College Park
  • 25. ROR icon Kyung Hee University
  • 26. ROR icon Weizmann Institute of Science
  • 27. ROR icon University of North Carolina at Chapel Hill
  • 28. ROR icon Pulkovo Observatory
  • 29. ROR icon Las Campanas Observatory
  • 30. ROR icon Andrés Bello University
  • 31. ROR icon Millennium Institute of Astrophysics
  • 32. ROR icon Macquarie University
  • 33. ROR icon Stockholm University

Abstract

SN 2018aoz is a Type Ia SN with a B-band plateau and excess emission in infant-phase light curves ≲1 day after the first light, evidencing an over-density of surface iron-peak elements as shown in our previous study. Here, we advance the constraints on the nature and origin of SN 2018aoz based on its evolution until the nebular phase. Near-peak spectroscopic features show that the SN is intermediate between two subtypes of normal Type Ia: core normal and broad line. The excess emission may be attributable to the radioactive decay of surface iron-peak elements as well as the interaction of ejecta with either the binary companion or a small torus of circumstellar material. Nebular-phase limits on Hα and He ɪ favor a white dwarf companion, consistent with the small companion size constrained by the low early SN luminosity, while the absence of [O ɪ] and He ɪ disfavors a violent merger of the progenitor. Of the two main explosion mechanisms proposed to explain the distribution of surface iron-peak elements in SN 2018aoz, the asymmetric Chandrasekhar-mass explosion is less consistent with the progenitor constraints and the observed blueshifts of nebular-phase [Fe ɪɪ] and [Ni ɪɪ]. The helium-shell double-detonation explosion is compatible with the observed lack of C spectral features, but current 1D models are incompatible with the infant-phase excess emission, Bₘₐₓ-Vₘₐₓ color, and weak strength of nebular-phase [Ca ɪɪ]. Although the explosion processes of SN 2018aoz still need to be more precisely understood, the same processes could produce a significant fraction of Type Ia SNe that appear to be normal after ∼1 day.

Additional Information

© 2023. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. This research has made use of the KMTNet system operated by the Korea Astronomy and Space Science Institute (KASI) and the data were obtained at three host sites of CTIO in Chile, SAAO in South Africa, and SSO in Australia. This research is also based on observations obtained at the international Gemini-S Observatory, a program of NSF's NOIRLab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation on behalf of the Gemini Observatory partnership: the National Science Foundation (United States), National Research Council (Canada), Agencia Nacional de Investigación y Desarrollo (Chile), Ministerio de Ciencia, Tecnología e Innovación (Argentina), Ministério da Ciência, Tecnologia, Inovações e Comunicações (Brazil), and Korea Astronomy and Space Science Institute (Republic of Korea). The Gemini-S observations were obtained under the K-GMT Science Program (PID: GS-2018A-Q-117 and GS-2018B-Q-121) of KASI and acquired through the Gemini Observatory Archive at NSF's NOIRLab. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. This work makes use of observations from the Las Cumbres Observatory (LCO) global telescope network. The LCO team is supported by NSF grants AST-1911225 and AST-1911151, and NASA Swift grant 80NSSC19K1639. The Swift observations were triggered through the Swift GI program 80NSSC19K0316. SOUSA is supported by NASA's Astrophysics Data Analysis Program through grant NNX13AF35G. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The Computational HEP program in The Department of Energy's Science Office of High Energy Physics provided simulation resources through grant #KA2401022. This research used resources of the National Energy Research Scientific Computing Center, a U.S. Department of Energy Office of Science User Facility operated under Contract No. DE-AC02-05CH11231. D.-S.M., M.R.D., and C.D.M. are supported by Discovery Grants from the Natural Sciences and Engineering Research Council of Canada. D.-S.M. was supported in part by a Leading Edge Fund from the Canadian Foundation for Innovation (project No. 30951). M.R.D. was supported in part by the Canada Research Chairs Program, the Canadian Institute for Advanced Research (CIFAR), and the Dunlap Institute at the University of Toronto. D.J.S. acknowledges support by NSF grants AST-1821987, 1821967, 1908972 and from the Heising-Simons Foundation under grant No. 2020-1864. S.G.-G. acknowledges support by FCT under Project CRISP PTDC/FIS-AST-31546 and Project UIDB/00099/2020. S.C.K., Y.L., and H.S.P. acknowledge support by KASI under the R&D program (Project No. 2022-1-868-04) supervised by the Ministry of Science and ICT. H.S.P. was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT, Ministry of Science and ICT; No. NRF-2019R1F1A1058228). P.J.B. acknowledges support from the Swift GI program 80NSSC19K0316. S.V., Y.D., and K.A.B. acknowledge support by NSF grants AST-1813176 and AST-2008108. C.M. acknowledges support by NSF grant AST-1313484. R.L.B. acknowledges support by NASA through Hubble Fellowship grant No. 51386.01 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. A.G.-Y's research is supported by the EU via ERC grant No. 725161, the ISF GW excellence center, an IMOS space infrastructure grant and BSF/Transformative and GIF grants, as well as the André Deloro Institute for Advanced Research in Space and Optics, the Schwartz/Reisman Collaborative Science Program and the Norman E. Alexander Family M Foundation ULTRASAT Data Center Fund, Minerva and Yeda-Sela; A.G.-Y. is the incumbent of The Arlyn Imberman Professorial Chair. L.G. acknowledges financial support from the Spanish Ministerio de Ciencia e Innovación (MCIN), the Agencia Estatal de Investigación (AEI) 10.13039/501100011033, and the European Social Fund (ESF) "Investing in your future" under the 2019 Ramón y Cajal program RYC2019-027683-I and the PID2020-115253GA-I00 HOSTFLOWS project, and from Centro Superior de Investigaciones Científicas (CSIC) under the PIE project 20215AT016. G.P. acknowledges support by ANID—Millennium Science Initiative—ICN12_009 and by FONDECYT Regular 1201793. J.A. is supported by the Stavros Niarchos Foundation (SNF) and the Hellenic Foundation for Research and Innovation (H.F.R.I.) under the 2nd Call of "Science and Society" Action Always strive for excellence—"Theodoros Papazoglou" (project No. 01431). Software: SNooPy (Burns et al. 2011), Castro (Almgren et al. 2010; Zingale et al. 2018), Sedona (Kasen et al. 2006), SNAP (https://github.com/niyuanqi/SNAP), IRAF.

Attached Files

Published - Ni_2023_ApJ_946_7.pdf

Files

Ni_2023_ApJ_946_7.pdf

Files (4.0 MB)

Name Size Download all
md5:eb0557ea19a7d110f8af217c530d3736
4.0 MB Preview Download

Additional details

Identifiers

Eprint ID
121526
Resolver ID
CaltechAUTHORS:20230525-772162500.12

Funding

NSF
AST-1911225
NSF
AST-1911151
NASA
80NSSC19K1639
NASA
NNX13AF35G
Department of Energy (DOE)
KA2401022
Canada Foundation for Innovation
30951
NSF
AST-1821987
NSF
AST-1821967
NSF
AST-1908972
Heising-Simons Foundation
2020-1864
Fundação para a Ciência e a Tecnologia (FCT)
CRISP PTDC/FIS-AST-31546
Fundação para a Ciência e a Tecnologia (FCT)
UIDB/00099/2020
Korea Astronomy and Space Science Institute (KASI)
2022-1-868-04
National Research Foundation of Korea
NRF-2019R1F1A1058228
NASA
80NSSC19K0316
NSF
AST-1813176
NSF
AST-2008108
NSF
AST-1313484
NASA Hubble Fellowship
51386.01
European Research Council (ERC)
725161
Agencia Estatal de Investigación
10.13039/501100011033
Ramón y Cajal Programme
RYC2019-027683-I
Agencia Estatal de Investigación (AEI)
PID2020-115253GA-I00
Centro Superior de Investigaciones Científicas
20215AT016
Agencia Nacional de Investigación y Desarrollo (ANID)
ICN12_009
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)
1201793
Hellenic Foundation for Research and Innovation
01431
Gemini Partnership
W. M. Keck Foundation
Department of Energy (DOE)
DE-AC02-05CH11231
Natural Sciences and Engineering Research Council of Canada (NSERC)
Canada Research Chairs Program
Canadian Institute for Advanced Research (CIFAR)
Dunlap Institute for Astronomy and Astrophysics
NASA
NAS 5-26555
Israel Science Foundation
Ministry of Science (Israel)
Binational Science Foundation (USA-Israel)
German-Israeli Foundation for Research and Development
André Deloro Institute for Advanced Research in Space and Optics
Schwartz/Reisman Collaborative Science Program
Norman E. Alexander Family M. Foundation
MINERVA (Israel)
Yeda-Sela
Arlyn Imberman Professorial Chair
Ministerio de Ciencia e Innovación (MCIN)
European Social Fund
Stavros Niarchos Foundation

Dates

Created
2023-07-07
Created from EPrint's datestamp field
Updated
2023-07-07
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
TAPIR, Walter Burke Institute for Theoretical Physics