2024MNRAS.530.3906W

Query : 2024MNRAS.530.3906W

2024MNRAS.530.3906W - Mon. Not. R. Astron. Soc., 530, 3906-3923 (2024/June-1)

A low-mass helium star progenitor model for the Type Ibn SN 2020nxt.

WANG Q., GOEL A., DESSART L., FOX O.D., SHAHBANDEH M., REST S., REST A., GROH J.H., ALLAN A., FRANSSON C., SMITH N., HOSSEINZADEH G., FILIPPENKO A.V., ANDREWS J., BOSTROEM K.A., BRINK T.G., BROWN P., BURKE J., CHEVALIER R., CLAYTON G.C., DAI M., DAVIS K.W., FOLEY R.J., GOMEZ S., HARRIS C., HIRAMATSU D., HOWELL D.A., JENNINGS C., JHA S.W., KASLIWAL M.M., KELLY P.L., KOOL E.C., LIU E., MA E., McCULLY C., MILLER A.M., MURAKAMI Y., PADILLA GONZALEZ E., PELLEGRINO C., PERERA D., PIEREL J., ROJAS-BRAVO C., SIEBERT M.R., SOLLERMAN J., SZALAI T., TINYANONT S., VAN DYK S.D., ZHENG W., CHAMBERS K.C., COULTER D.A., DE BOER T., EARL N., FARIAS D., GALL C., McGILL P., RANSOME C.L., TAGGART K. and VILLAR V.A.

Abstract (from CDS):

A growing number of supernovae (SNe) are now known to exhibit evidence for significant interaction with a dense, pre-existing, circumstellar medium (CSM). SNe Ibn comprise one such class that can be characterized by both rapidly evolving light curves and persistent narrow He I lines. The origin of such a dense CSM in these systems remains a pressing question, specifically concerning the progenitor system and mass-loss mechanism. In this paper, we present multiwavelength data of the Type Ibn SN 2020nxt, including HST/STIS ultraviolet spectra. We fit the data with recently updated CMFGEN models designed to handle configurations for SNe Ibn. The UV coverage yields strong constraints on the energetics and, when combined with the CMFGEN models, offer new insight on potential progenitor systems. We find the most successful model is a ≲4 M⊙ helium star that lost its $\sim 1\, {\rm M}_\odot$ He-rich envelope in the years preceding core collapse. We also consider viable alternatives, such as a He white dwarf merger. Ultimately, we conclude at least some SNe Ibn do not arise from single, massive (>30 M⊙) Wolf-Rayet-like stars.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): circumstellar matter - supernovae: individual: SN 2020nxt - ultraviolet: general - transients: supernovae

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

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SN 2023bee SN* 08 56 11.620 -03 19 32.05           SNIc 15 0
2 SN 2006jc SN* 09 17 20.78 +41 54 32.7     13.8     SNIbn 380 1
3 SN 1994W SN* 12 02 10.92 +62 08 32.7     13.3     SNIInP 194 1
4 SN 2018bcc SN* 16 14 22.650 +35 55 04.48           ~ 16 0
5 SN 2018cow SN* 16 16 00.254 +22 16 05.10           SNIb 305 0
6 SN 2015G SN* 20 37 25.58 +66 07 11.5           SNIbn 42 1
7 SN 2011hw SN* 22 26 14.54 +34 12 59.1           SNIIn: 61 1
8 SN 2020nxt SN* 22 37 36.235 +35 00 07.68           SNIbn 12 0
9 2MASX J22373660+3500074 G 22 37 36.60647 +35 00 07.4990           ~ 3 0

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