SIMBAD references

2023ApJ...951...34T - Astrophys. J., 951, 34 (2023/July-1)

Supernova 2020wnt: An Atypical Superluminous Supernova with a Hidden Central Engine.

TINYANONT S., WOOSLEY S.E., TAGGART K., FOLEY R.J., YAN L., LUNNAN R., DAVIS K.W., KILPATRICK C.D., SIEBERT M.R., SCHULZE S., ASHALL C., CHEN T.-W., DE K., DIMITRIADIS G., DONG D.Z., FREMLING C., GAGLIANO A., JHA S.W., JONES D.O., KASLIWAL M.M., MIAO H.-Y., PAN Y.-C., PERLEY D.A., RAVI V., ROJAS-BRAVO C., SFARADI I., SOLLERMAN J., ALARCON V., ANGULO R., CLEVER K.E., CRAWFORD P., COUCH C., DANDU S., DHARA A., JOHNSON J., LAI Z. and SMITH C.

Abstract (from CDS):

We present observations of a peculiar hydrogen- and helium-poor stripped-envelope (SE) supernova (SN) 2020wnt, primarily in the optical and near-infrared (near-IR). Its peak absolute bolometric magnitude of -20.9 mag (L_bol, peak_ = (6.8 ± 0.3) × 1043 erg s–1) and a rise time of 69 days are reminiscent of hydrogen-poor superluminous SNe (SLSNe I), luminous transients potentially powered by spinning-down magnetars. Before the main peak, there is a brief peak lasting <10 days post explosion, likely caused by interaction with circumstellar medium (CSM) ejected ∼years before the SN explosion. The optical spectra near peak lack a hot continuum and O II absorptions, which are signs of heating from a central engine; they quantitatively resemble those of radioactivity-powered hydrogen/helium-poor Type Ic SESNe. At ∼1 yr after peak, nebular spectra reveal a blue pseudo-continuum and narrow O I recombination lines associated with magnetar heating. Radio observations rule out strong CSM interactions as the dominant energy source at +266 days post peak. Near-IR observations at +200-300 days reveal carbon monoxide and dust formation, which causes a dramatic optical light-curve dip. Pair-instability explosion models predict slow light curve and spectral features incompatible with observations. SN 2020wnt is best explained as a magnetar-powered core-collapse explosion of a 28 M pre-SN star. The explosion kinetic energy is significantly larger than the magnetar energy at peak, effectively concealing the magnetar-heated inner ejecta until well after peak. SN 2020wnt falls into a continuum between normal SNe Ic and SLSNe I, and demonstrates that optical spectra at peak alone cannot rule out the presence of a central engine.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Core-collapse supernovae - Massive stars - Dust formation

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 19

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