Massive stars exploding in a He-rich circumstellar medium - X : flash spectral features in the Type Ibn SN 2019cj and observations of SN 2018jmt

Wang, Z.-Y.; Pastorello, A.; Maeda, K.; Reguitti, A.; Cai, Y.-Z.; Howell, D. Andrew; Benetti, S.; Bronikowski, Mateusz; Concepcion, E.; Petrushevska, Tanja

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Naslov:	Massive stars exploding in a He-rich circumstellar medium - X : flash spectral features in the Type Ibn SN 2019cj and observations of SN 2018jmt
Avtorji:	ID Wang, Z.-Y. (Avtor) ID Pastorello, A. (Avtor) ID Maeda, K. (Avtor) ID Reguitti, A. (Avtor) ID Cai, Y.-Z. (Avtor) ID Howell, D. Andrew (Avtor) ID Benetti, S. (Avtor) ID Bronikowski, Mateusz (Avtor) ID Concepcion, E. (Avtor) ID Petrushevska, Tanja (Avtor)
Datoteke:	https://www.aanda.org/component/article?access=doi&doi=10.1051/0004-6361/202451131 https://www.aanda.org/10.1051/0004-6361/202451131/pdf https://www.aanda.org/articles/aa/pdf/forth/aa51131-24.pdf
Jezik:	Angleški jezik
Vrsta gradiva:	Neznano
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UNG - Univerza v Novi Gorici
Opis:	We present optical and near-infrared observations of two Type Ibn supernovae (SNe), SN\,2018jmt and SN\,2019cj. Their light curves have rise times of about ten days, reaching an absolute peak magnitude of $M_g$ (SN\,2018jmt) = $-$ 19.07 pm 0.37 and $M_V$ (SN\,2019cj) = $-$ 18.94 pm 0.19 mag, respectively. The early-time spectra of SN\,2018jmt are dominated by a blue continuum, accompanied by narrow (600 $-$ 1000 km $) He i lines with the P-Cygni profile. At later epochs, the spectra become more similar to those of the prototypical SN Ibn 2006jc. At early phases, the spectra of SN\,2019cj show flash ionisation emission lines of C iii N iii and He ii superposed on a blue continuum. These features disappear after a few days, and then the spectra of SN\,2019cj evolve similarly to those of SN\,2018jmt. The spectra indicate that the two SNe exploded within a He-rich circumstellar medium (CSM) lost by the progenitors a short time before the explosion. We modelled the light curves of the two SNe Ibn to constrain the progenitor and the explosion parameters. The ejecta masses are consistent with either what is expected for a canonical SN Ib (sim 2 odot$ ) or for a massive Wolf Rayet star ( $>$ sim 4 M $_ odot$ ), with the kinetic energy on the order of $10^$ erg. The lower limit on the ejecta mass ( $>$ sim 2 M odot $) argues against a scenario involving a relatively low-mass progenitor (e.g.$ M_ ZAMS $sim 10 M$ _ odot $). We set a conservative upper limit of sim 0.1 M$ _ odot $ for the 56Ni masses in both SNe. From the light curve modelling, we determined a two-zone CSM distribution, with an inner, flat CSM component and an outer CSM with a steeper density profile. The physical properties of SN\,2018jmt and SN\,2019cj are consistent with those expected from the core collapse of relatively massive envelope-stripped stars.
Ključne besede:	supernovae
Status publikacije:	V tisku
Verzija publikacije:	Recenzirani rokopis
Datum objave:	01.01.2024
Leto izida:	2024
Št. strani:	str. 1-21
Številčenje:	Vol. , article no. ǂ
PID:	20.500.12556/RUNG-9457
COBISS.SI-ID:	213919491
UDK:	52
ISSN pri članku:	1432-0746
DOI:	10.1051/0004-6361/202451131
NUK URN:	URN:SI:UNG:REP:OPFPTTEA
Datum objave v RUNG:	06.11.2024
Število ogledov:	773
Število prenosov:	6
Metapodatki:
:	WANG, Z.-Y., PASTORELLO, A., MAEDA, K., REGUITTI, A., CAI, Y.-Z., HOWELL, D. Andrew, BENETTI, S., BRONIKOWSKI, Mateusz, CONCEPCION, E. in PETRUSHEVSKA, Tanja, 2024, Massive stars exploding in a He-rich circumstellar medium - X : flash spectral features in the Type Ibn SN 2019cj and observations of SN 2018jmt. Astronomy & astrophysics [na spletu]. 2024. P. 1–21. [Dostopano 7 april 2025]. DOI 10.1051/0004-6361/202451131. Pridobljeno s: https://www.aanda.org/articles/aa/pdf/forth/aa51131-24.pdf Kopiraj citat

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Gradivo je del revije

Naslov:	Astronomy & astrophysics
Skrajšan naslov:	Astron. astrophys.
Založnik:	EDP Sciences
ISSN:	1432-0746
COBISS.SI-ID:	392577

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Jezik:	Slovenski jezik
Ključne besede:	astronomija, izbruhi sevanja gama, supernove

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