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ZTF18aalrxas :
ZTF18aalrxas : A Type IIb Supernova from a Very Extended Low-mass Progenitor
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Fremling, C. (author)
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Ko, H. (author)
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Dugas, A. (author)
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show more...
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- Ergon, Mattias (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Sollerman, Jesper (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Bagdasaryan, A. (author)
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- Barbarino, Cristina (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Belicki, J. (author)
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Bellm, E. (author)
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Blagorodnova, N. (author)
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De, K. (author)
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Dekany, R. (author)
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Frederick, S. (author)
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Gal-Yam, A. (author)
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Goldstein, D. A. (author)
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Golkhou, V. Z. (author)
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Graham, M. (author)
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Kasliwal, M. (author)
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Kowalski, M. (author)
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Kulkarni, S. R. (author)
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Kupfer, T. (author)
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Laher, R. R. (author)
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Masci, F. J. (author)
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Miller, A. A. (author)
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Neill, J. D. (author)
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Perley, D. A. (author)
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Rebbapragada, U. D. (author)
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Riddle, R. (author)
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Rusholme, B. (author)
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Schulze, S. (author)
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Smith, R. M. (author)
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- Tartaglia, Leonardo (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Yan, Lin (author)
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Yao, Y. (author)
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(creator_code:org_t)
- 2019-06-05
- 2019
- English.
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In: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8205 .- 2041-8213. ; 878:1
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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
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- We investigate ZTF18aalrxas, a double-peaked Type IIb core-collapse supernova (SN) discovered during science validation of the Zwicky Transient Facility. ZTF18aalrxas was discovered while the optical emission was still rising toward the initial cooling peak (0.7 mag over 2 days). Our observations consist of multi-band (ultraviolet and optical) light curves (LCs), and optical spectra spanning from approximate to 0.7 to approximate to 480 days past the explosion. We use a Monte-Carlo based non-local thermodynamic equilibrium model that simultaneously reproduces both the Ni-56-powered bolometric LC and our nebular spectrum. This model is used to constrain the synthesized radioactive nickel mass (0.17 M-circle dot) and the total ejecta mass (1.7 M-circle dot) of the SN. The cooling emission is modeled using semi-analytical extended envelope models to constrain the progenitor radius (790-1050 R-circle dot) at the time of explosion. Our nebular spectrum shows signs of interaction with a dense circumstellar medium (CSM), and this spectrum is modeled and analyzed to constrain the amount of ejected oxygen (0.3-0.5 M-circle dot) and the total hydrogen mass (approximate to 0.15 M-circle dot) in the envelope of the progenitor. The oxygen mass of ZTF18aalrxas is consistent with a low (12-13 M-circle dot) zero-age main-sequence mass progenitor. The LCs and spectra of ZTF18aalrxas are not consistent with massive single-star SN Type IIb progenitor models. The presence of an extended hydrogen envelope of low mass, the presence of a dense CSM, the derived ejecta mass, and the late-time oxygen emission can all be explained in a binary model scenario.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- supernovae: general
- supernovae: individual (ZTF18aalrxas)
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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Fremling, C.
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Ko, H.
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Dugas, A.
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Ergon, Mattias
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Sollerman, Jespe ...
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Bagdasaryan, A.
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show more...
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Barbarino, Crist ...
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Belicki, J.
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Bellm, E.
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Blagorodnova, N.
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De, K.
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Dekany, R.
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Frederick, S.
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Gal-Yam, A.
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Goldstein, D. A.
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Golkhou, V. Z.
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Graham, M.
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Kasliwal, M.
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Kowalski, M.
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Kulkarni, S. R.
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Kupfer, T.
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Laher, R. R.
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Masci, F. J.
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Miller, A. A.
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Neill, J. D.
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Perley, D. A.
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Rebbapragada, U. ...
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Riddle, R.
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Rusholme, B.
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Schulze, S.
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Smith, R. M.
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Tartaglia, Leona ...
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Yan, Lin
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Yao, Y.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Astrophysical Jo ...
- By the university
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Stockholm University