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- W4312711611 abstract "We present ZTF18abvkwla (the “Koala”), a fast blue optical transient discovered in the Zwicky Transient Facility (ZTF) One-Day Cadence (1DC) Survey. ZTF18abvkwla has a number of features in common with the groundbreaking transient AT 2018cow: blue colors at peak (g − r ≈−0.5 mag), a short rise time from half-max of under two days, a decay time to half-max of only three days, a high optical luminosity (Mg,peak ≈−20.6 mag), a hot (≳40, 000 K) featureless spectrum at peak light, and a luminous radio counterpart. At late times (Δt > 80 d), the radio luminosity of ZTF18abvkwla (νLν ≳ 1040 erg s−1 at 10 GHz, observer-frame) is most similar to that of long-duration gamma-ray bursts (GRBs). The host galaxy is a dwarf starburst galaxy (M ≈ 5 × 108 M⊙, SFR ≈ 7 M⊙ yr−1) that is moderately metal-enriched ( $$log mathrm {[O/H]} approx 8.5$$ ), similar to the hosts of GRBs and superluminous supernovae. As in AT2018cow, the radio and optical emission in ZTF18abvkwla likely arise from two separate components: the radio from fast-moving ejecta (Γβc > 0.38c) and the optical from shock interaction with confined dense material (<0.07 M⊙ in ∼1015 cm). Compiling transients in the literature with trise < 5 d and Mpeak < −20 mag, we find that a significant number are engine-powered and suggest that the high peak optical luminosity is directly related to the presence of this engine. From 18 months of the 1DC survey, we find that transients in this rise-luminosity phase-space are at least two to three orders of magnitude less common than CC SNe. Finally, we discuss strategies for identifying such events with future facilities such as the Large Synoptic Survey Telescope and prospects for detecting accompanying X-ray and radio emission. This chapter is based on Ho, A. Y. Q., et al. (2020). The koala: A fast blue optical transient with luminous radio emission from a Starburst Dwarf Galaxy at z = 0.27. The Astrophysical Journal, 895(1), 49. https://doi.org/10.3847/1538-4357/ab8bcf . arXiv: 2003.01222 [astro-ph.HE]." @default.
- W4312711611 created "2023-01-05" @default.
- W4312711611 creator A5074183149 @default.
- W4312711611 date "2022-01-01" @default.
- W4312711611 modified "2023-10-15" @default.
- W4312711611 title "The Koala: A Fast Blue Optical Transient with Luminous Radio Emission from a Starburst Dwarf Galaxy at z = 0.27" @default.
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