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AT 2017be-a new mem...
AT 2017be-a new member of the class of intermediate-luminosity red transients
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Cai, Y-Z. (author)
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Pastorello, A. (author)
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Fraser, M. (author)
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Botticella, M. T. (author)
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Gall, C. (author)
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Arcavi, I. (author)
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Benetti, S. (author)
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Cappellaro, E. (author)
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Elias-Rosa, N. (author)
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Harmanen, J. (author)
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Hosseinzadeh, G. (author)
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Howell, D. A. (author)
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Isern, J. (author)
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Kangas, T. (author)
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Kankare, E. (author)
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Kuncarayakti, H. (author)
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- Lundqvist, Peter (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Mattila, S. (author)
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McCully, C. (author)
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Reynolds, T. M. (author)
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Somero, A. (author)
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Stritzinger, M. D. (author)
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Terreran, G. (author)
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(creator_code:org_t)
- 2018-08-01
- 2018
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 480:3, s. 3424-3445
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We report the results of our spectrophotometric monitoring campaign for AT 2017be in NGC 2537. Its light curve reveals a fast rise to an optical maximum, followed by a plateau lasting about 30 d, and finally a fast decline. Its absolute peak magnitude (M-r similar or equal to -12 mag) is fainter than that of core-collapse supernovae, and is consistent with those of supernova impostors and other intermediate-luminosity optical transients. The quasi-bolometric light-curve peaks at similar to 2 x 10(40) erg s(-1), and the late-time photometry allows us to constrain an ejected Ni-56 mass of similar to 8 x 10(-4)M(circle dot). The spectra of AT 2017 be show minor evolution over the observational period, a relatively blue continuum showing at early phases, which becomes redder with time. A prominent H alpha emission line always dominates over other Balmer lines. Weak Fe II features, Can H&K, and the Ca II NIR triplet are also visible, while P-Cygni absorption troughs are found in a high-resolution spectrum. In addition, the [Ca II] lambda lambda 7291, 7324 doublet is visible in all spectra. This feature is typical of intermediate-luminosity red transients (ILRTs), similar to SN 2008S. The relatively shallow archival Spitzer data are not particularly constraining. On the other hand, a non-detection in deeper near-infrared HST images disfavours a massive Luminous Blue Variable eruption as the origin for AT 2017be. As has been suggested for other ILRTs, we propose that AT 2017be is a candidate for a weak electron-capture supernova explosion of a superasymptotic giant branch star, still embedded in a thick dusty envelope.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- stars: AGB and post-AGB
- stars: mass-loss
- supernovae: general
- galaxies: individual: NGC 2537
- supernovae: individual: AT 2017be
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Cai, Y-Z.
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Pastorello, A.
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Fraser, M.
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Botticella, M. T ...
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Gall, C.
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Arcavi, I.
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show more...
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Benetti, S.
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Cappellaro, E.
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Elias-Rosa, N.
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Harmanen, J.
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Hosseinzadeh, G.
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Howell, D. A.
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Isern, J.
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Kangas, T.
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Kankare, E.
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Kuncarayakti, H.
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Lundqvist, Peter
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Mattila, S.
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McCully, C.
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Reynolds, T. M.
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Somero, A.
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Stritzinger, M. ...
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Terreran, G.
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show less...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Astronomy Astrop ...
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Stockholm University