ZTF 18aaqeasu (SN2018byg): A Massive Helium-shell Double Detonation on a Sub-Chandrasekhar-mass White Dwarf
Abstract
The detonation of a helium shell on a white dwarf (WD) has been proposed as a possible explosion triggering mechanism for SNe Ia. Here, we report ZTF 18aaqeasu (SN 2018byg/ATLAS 18pqq), a peculiar Type I supernova, consistent with being a helium-shell double-detonation. With a rise time of ≈18 days from explosion, the transient reached a peak absolute magnitude of M R ≈ -18.2 mag, exhibiting a light curve akin to sub-luminous SN 1991bg-like SNe Ia, albeit with an unusually steep increase in brightness within a week from explosion. Spectra taken near peak light exhibit prominent Si absorption features together with an unusually red color (g - r ≈ 2 mag) arising from nearly complete line blanketing of flux blueward of 5000 Å. This behavior is unlike any previously observed thermonuclear transient. Nebular phase spectra taken at and after ≈30 days from peak light reveal evidence of a thermonuclear detonation event dominated by Fe-group nucleosynthesis. We show that the peculiar properties of ZTF 18aaqeasu are consistent with the detonation of a massive (≈0.15 M⊙) helium shell on a sub-Chandrasekhar mass (≈0.75 ) WD after including mixing of ≈0.2 M⊙of material in the outer ejecta. Furthermore, these observations provide evidence of amore »
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- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of California, Santa Barbara, CA (United States)
- Univ. of Washington, Seattle, WA (United States)
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States)
- Northwestern Univ., Evanston, IL (United States); The Adler Planetarium, Chicago, IL (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1526561
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal. Letters (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal. Letters (Online); Journal Volume: 873; Journal Issue: 2; Journal ID: ISSN 2041-8213
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; supernovae: general; supernovae: individual (SN2018byg); surveys; white dwarf
Citation Formats
De, Kishalay, Kasliwal, Mansi M., Polin, Abigail, Nugent, Peter E., Bildsten, Lars, Adams, Scott M., Bellm, Eric C., Blagorodnova, Nadia, Burdge, Kevin B., Cannella, Christopher, Cenko, S. Bradley, Dekany, Richard G., Feeney, Michael, Hale, David, Fremling, U. Christoffer, Graham, Matthew J., Ho, Anna Y. Q., Jencson, Jacob E., Kulkarni, S. R., Laher, Russ R., Masci, Frank J., Miller, Adam A., Patterson, Maria T., Rebbapragada, Umaa, Riddle, Reed L., Shupe, David L., and Smith, Roger M. ZTF 18aaqeasu (SN2018byg): A Massive Helium-shell Double Detonation on a Sub-Chandrasekhar-mass White Dwarf. United States: N. p., 2019.
Web. doi:10.3847/2041-8213/ab0aec.
De, Kishalay, Kasliwal, Mansi M., Polin, Abigail, Nugent, Peter E., Bildsten, Lars, Adams, Scott M., Bellm, Eric C., Blagorodnova, Nadia, Burdge, Kevin B., Cannella, Christopher, Cenko, S. Bradley, Dekany, Richard G., Feeney, Michael, Hale, David, Fremling, U. Christoffer, Graham, Matthew J., Ho, Anna Y. Q., Jencson, Jacob E., Kulkarni, S. R., Laher, Russ R., Masci, Frank J., Miller, Adam A., Patterson, Maria T., Rebbapragada, Umaa, Riddle, Reed L., Shupe, David L., & Smith, Roger M. ZTF 18aaqeasu (SN2018byg): A Massive Helium-shell Double Detonation on a Sub-Chandrasekhar-mass White Dwarf. United States. https://doi.org/10.3847/2041-8213/ab0aec
De, Kishalay, Kasliwal, Mansi M., Polin, Abigail, Nugent, Peter E., Bildsten, Lars, Adams, Scott M., Bellm, Eric C., Blagorodnova, Nadia, Burdge, Kevin B., Cannella, Christopher, Cenko, S. Bradley, Dekany, Richard G., Feeney, Michael, Hale, David, Fremling, U. Christoffer, Graham, Matthew J., Ho, Anna Y. Q., Jencson, Jacob E., Kulkarni, S. R., Laher, Russ R., Masci, Frank J., Miller, Adam A., Patterson, Maria T., Rebbapragada, Umaa, Riddle, Reed L., Shupe, David L., and Smith, Roger M. Sun .
"ZTF 18aaqeasu (SN2018byg): A Massive Helium-shell Double Detonation on a Sub-Chandrasekhar-mass White Dwarf". United States. https://doi.org/10.3847/2041-8213/ab0aec. https://www.osti.gov/servlets/purl/1526561.
@article{osti_1526561,
title = {ZTF 18aaqeasu (SN2018byg): A Massive Helium-shell Double Detonation on a Sub-Chandrasekhar-mass White Dwarf},
author = {De, Kishalay and Kasliwal, Mansi M. and Polin, Abigail and Nugent, Peter E. and Bildsten, Lars and Adams, Scott M. and Bellm, Eric C. and Blagorodnova, Nadia and Burdge, Kevin B. and Cannella, Christopher and Cenko, S. Bradley and Dekany, Richard G. and Feeney, Michael and Hale, David and Fremling, U. Christoffer and Graham, Matthew J. and Ho, Anna Y. Q. and Jencson, Jacob E. and Kulkarni, S. R. and Laher, Russ R. and Masci, Frank J. and Miller, Adam A. and Patterson, Maria T. and Rebbapragada, Umaa and Riddle, Reed L. and Shupe, David L. and Smith, Roger M.},
abstractNote = {The detonation of a helium shell on a white dwarf (WD) has been proposed as a possible explosion triggering mechanism for SNe Ia. Here, we report ZTF 18aaqeasu (SN 2018byg/ATLAS 18pqq), a peculiar Type I supernova, consistent with being a helium-shell double-detonation. With a rise time of ≈18 days from explosion, the transient reached a peak absolute magnitude of M R ≈ -18.2 mag, exhibiting a light curve akin to sub-luminous SN 1991bg-like SNe Ia, albeit with an unusually steep increase in brightness within a week from explosion. Spectra taken near peak light exhibit prominent Si absorption features together with an unusually red color (g - r ≈ 2 mag) arising from nearly complete line blanketing of flux blueward of 5000 Å. This behavior is unlike any previously observed thermonuclear transient. Nebular phase spectra taken at and after ≈30 days from peak light reveal evidence of a thermonuclear detonation event dominated by Fe-group nucleosynthesis. We show that the peculiar properties of ZTF 18aaqeasu are consistent with the detonation of a massive (≈0.15 M⊙) helium shell on a sub-Chandrasekhar mass (≈0.75 ) WD after including mixing of ≈0.2 M⊙of material in the outer ejecta. Furthermore, these observations provide evidence of a likely rare class of thermonuclear supernovae arising from detonations of massive helium shells.},
doi = {10.3847/2041-8213/ab0aec},
journal = {The Astrophysical Journal. Letters (Online)},
number = 2,
volume = 873,
place = {United States},
year = {Sun Mar 10 00:00:00 EST 2019},
month = {Sun Mar 10 00:00:00 EST 2019}
}
Web of Science
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Double-Detonation Models for Type Ia Supernovae: Trigger of Detonation in Companion White Dwarfs and Signatures of Companions' Stripped-off Materials
text, January 2019
- Tanikawa, Ataru; Nomoto, Ken'ichi; Nakasato, Naohito
- arXiv
Possible Contribution of Magnetized White Dwarf Binaries to Type Ia Supernova Populations
text, January 2019
- Ablimit, Iminhaji; Maeda, Keiichi
- arXiv
ZTF Early Observations of Type Ia Supernovae I: Properties of the 2018 Sample
text, January 2019
- Yao, Yuhan; Miller, Adam A.; Kulkarni, S. R.
- arXiv