SIMBAD references

2022ApJ...924...55G - Astrophys. J., 924, 55-55 (2022/January-2)

An early-time optical and ultraviolet excess in the type-Ic SN 2020oi.

GAGLIANO A., IZZO L., KILPATRICK C.D., MOCKLER B., JACOBSON-GALAN W.V., TERRERAN G., DIMITRIADIS G., ZENATI Y., AUCHETTL K., DROUT M.R., NARAYAN G., FOLEY R.J., MARGUTTI R., REST A., JONES D.O., AGANZE C., ALEO P.D., BURGASSER A.J., COULTER D.A., GERASIMOV R., GALL C., HJORTH J., HSU C.-C., MAGNIER E.A., MANDEL K.S., PIRO A.L., ROJAS-BRAVO C., SIEBERT M.R., STACEY H., STROH M.C., SWIFT J.J., TAGGART K., TINYANONT S. (The Young Supernova Experiment)

Abstract (from CDS):

We present photometric and spectroscopic observations of Supernova 2020oi (SN 2020oi), a nearby (∼17 Mpc) type-Ic supernova (SN Ic) within the grand-design spiral M100. We undertake a comprehensive analysis to characterize the evolution of SN 2020oi and constrain its progenitor system. We detect flux in excess of the fireball rise model δt ≃ 2.5 days from the date of explosion in multiband optical and UV photometry from the Las Cumbres Observatory and the Neil Gehrels Swift Observatory, respectively. The derived SN bolometric luminosity is consistent with an explosion with Mej = 0.81 ± 0.03 M, Ek = 0.79 ± 0.09 x 1051 erg s–1, and MNi56 = 0.08 ± 0.02 M. Inspection of the event's decline reveals the highest Δm15,bol reported for a stripped-envelope event to date. Modeling of optical spectra near event peak indicates a partially mixed ejecta comparable in composition to the ejecta observed in SN 1994I, while the earliest spectrum shows signatures of a possible interaction with material of a distinct composition surrounding the SN progenitor. Further, Hubble Space Telescope pre-explosion imaging reveals a stellar cluster coincident with the event. From the cluster photometry, we derive the mass and age of the SN progenitor using stellar evolution models implemented in the BPASS library. Our results indicate that SN 2020oi occurred in a binary system from a progenitor of mass MZAMS ≃ 9.5 ± 1.0 M, corresponding to an age of 27 ± 7 Myr. SN 2020oi is the dimmest SN Ic event to date for which an early-time flux excess has been observed, and the first in which an early excess is unlikely to be associated with shock cooling.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Core-collapse supernovae - Type Ic supernovae - Galaxy spectroscopy - Hubble Space Telescope - Explosive nucleosynthesis - Circumstellar envelopes - Spiral galaxies

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

Simbad objects: 18

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2022.09.28-05:06:30

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