SN 2018fif: The Explosion of a Large Red Supergiant Discovered in Its Infancy by the Zwicky Transient Facility

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SN 2018fif : The Explosion of a Large Red Supergiant Discovered in Its Infancy by the Zwicky Transient Facility

Soumagnac, Maayane T. (author)

Ganot, Noam (author)

Irani, Ido (author)

Gal-yam, Avishay (author)

Ofek, Eran O. (author)

Waxman, Eli (author)

Morag, Jonathan (author)

Yaron, Ofer (author)

Schulze, Steve (author)

Yang, Yi (author)

Rubin, Adam (author)

Cenko, S. Bradley (author)

Sollerman, Jesper (author): Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)

Perley, Daniel A. (author)

Fremling, Christoffer (author)

Nugent, Peter (author)

Neill, James D. (author)

Karamehmetoglu, Emir (author): Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)

Bellm, Eric C. (author)

Bruch, Rachel J. (author)

Burruss, Rick (author)

Cunningham, Virginia (author)

Dekany, Richard (author)

Golkhou, V. Zach (author)

Graham, Matthew J. (author)

Kasliwal, Mansi M. (author)

Konidaris, Nicholas P. (author)

Kulkarni, Shrinivas R. (author)

Kupfer, Thomas (author)

Laher, Russ R. (author)

Masci, Frank J. (author)

Riddle, Reed (author)

Rigault, Mickael (author)

Rusholme, Ben (author)

van Roestel, Jan (author)

Zackay, Barak (author)

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(creator_code:org_t)

2020-10-07
2020
English.
In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 902:1

Related links:: https://iopscience.i...; show more...; https://urn.kb.se/re...; https://doi.org/10.3...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

High-cadence transient surveys are able to capture supernovae closer to their first light than ever before. Applying analytical models to such early emission, we can constrain the progenitor stars' properties. In this paper, we present observations of SN 2018fif (ZTF 18abokyfk). The supernova was discovered close to first light and monitored by the Zwicky Transient Facility (ZTF) and the Neil Gehrels Swift Observatory. Early spectroscopic observations suggest that the progenitor of SN 2018fif was surrounded by relatively small amounts of circumstellar material compared to all previous cases. This particularity, coupled with the high-cadence multiple-band coverage, makes it a good candidate to investigate using shock-cooling models. We employ the SOPRANOS code, an implementation of the model by Sapir & Waxman and its extension to early times by Morag et al. Compared with previous implementations, SOPRANOS has the advantage of including a careful account of the limited temporal validity domain of the shock-cooling model as well as allowing usage of the entirety of the early UV data. We find that the progenitor of SN 2018fif was a large red supergiant with a radius of R = 744.0(-128.0)(+183.0) R-circle dot and an ejected mass of M-ej = 9.3(-5.8)(+0.4) M-circle dot. Our model also gives information on the explosion epoch, the progenitor's inner structure, the shock velocity, and the extinction. The distribution of radii is double-peaked, with smaller radii corresponding to lower values of the extinction, earlier recombination times, and a better match to the early UV data. If these correlations persist in future objects, denser spectroscopic monitoring constraining the time of recombination, as well as accurate UV observations (e.g., with ULTRASAT), will help break the extinction/radius degeneracy and independently determine both.

Subject headings

NATURVETENSKAP -- Fysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences (hsv//eng)

Keyword

Supernovae
Type II supernovae
Astronomy data modeling
Observational astronomy
Ultraviolet transient sources
Transient sources

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ref (subject category)
art (subject category)

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...

Articles in the publication: Astrophysical Jo ...

By the university: Stockholm University

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