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The Origin and Evol...
The Origin and Evolution of the Normal Type Ia SN 2018aoz with Infant-phase Reddening and Excess Emission
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Ni, Yuan Qi (author)
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Moon, Dae-Sik (author)
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Drout, Maria R. (author)
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show more...
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Polin, Abigail (author)
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Sand, David J. (author)
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González-Gaitán, Santiago (author)
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Kim, Sang Chul (author)
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Lee, Youngdae (author)
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Park, Hong Soo (author)
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Howell, D. Andrew (author)
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Nugent, Peter E. (author)
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Piro, Anthony L. (author)
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Brown, Peter J. (author)
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Galbany, Lluís (author)
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Burke, Jamison (author)
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Hiramatsu, Daichi (author)
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Hosseinzadeh, Griffin (author)
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Valenti, Stefano (author)
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Afsariardchi, Niloufar (author)
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Andrews, Jennifer E. (author)
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Antoniadis, John (author)
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Beaton, Rachael L. (author)
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Bostroem, K. Azalee (author)
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Carlberg, Raymond G. (author)
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Cenko, S. Bradley (author)
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Cha, Sang-Mok (author)
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Dong, Yize (author)
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Gal-Yam, Avishay (author)
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Haislip, Joshua (author)
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Holoien, Thomas W.-S. (author)
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Johnson, Sean D. (author)
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Kouprianov, Vladimir (author)
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Lee, Yongseok (author)
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Matzner, Christopher D. (author)
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Morrell, Nidia (author)
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McCully, Curtis (author)
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Pignata, Giuliano (author)
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Reichart, Daniel E. (author)
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Rich, Jeffrey (author)
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Ryder, Stuart D. (author)
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Smith, Nathan (author)
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Wyatt, Samuel (author)
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- Yang, Sheng, 1990- (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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(creator_code:org_t)
- 2023-03-21
- 2023
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 946:1
- Related links:
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https://doi.org/10.3...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Subject headings
Close
- 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 i favor a white dwarf companion, consistent with the small companion size constrained by the low early SN luminosity, while the absence of [O I] and He i 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 II] and [Ni II]. 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 II]. 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Binary stars
- Supernovae
- Type Ia supernovae
- White dwarf stars
- Transient sources
- Time domain astronomy
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Ni, Yuan Qi
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Moon, Dae-Sik
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Drout, Maria R.
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Polin, Abigail
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Sand, David J.
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González-Gaitán, ...
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show more...
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Kim, Sang Chul
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Lee, Youngdae
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Park, Hong Soo
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Howell, D. Andre ...
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Nugent, Peter E.
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Piro, Anthony L.
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Brown, Peter J.
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Galbany, Lluís
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Burke, Jamison
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Hiramatsu, Daich ...
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Hosseinzadeh, Gr ...
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Valenti, Stefano
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Afsariardchi, Ni ...
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Andrews, Jennife ...
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Antoniadis, John
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Beaton, Rachael ...
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Bostroem, K. Aza ...
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Carlberg, Raymon ...
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Cenko, S. Bradle ...
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Cha, Sang-Mok
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Dong, Yize
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Gal-Yam, Avishay
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Haislip, Joshua
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Holoien, Thomas ...
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Johnson, Sean D.
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Kouprianov, Vlad ...
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Lee, Yongseok
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Matzner, Christo ...
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Morrell, Nidia
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McCully, Curtis
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Pignata, Giulian ...
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Reichart, Daniel ...
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Rich, Jeffrey
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Ryder, Stuart D.
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Smith, Nathan
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Wyatt, Samuel
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Yang, Sheng, 199 ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Astrophysical Jo ...
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Stockholm University