2023ApJ...946...83L


Query : 2023ApJ...946...83L

2023ApJ...946...83L - Astrophys. J., 946, 83 (2023/April-1)

SN 2020jgb: A Peculiar Type Ia Supernova Triggered by a Helium-shell Detonation in a Star-forming Galaxy.

LIU C., MILLER A.A., POLIN A., NUGENT A.E., DE K., NUGENT P.E., SCHULZE S., GAL-YAM A., FREMLING C., ANAND S., ANDREONI I., BLANCHARD P., BRINK T.G., DHAWAN S., FILIPPENKO A.V., MAGUIRE K., SCHWEYER T., SEARS H., SHARMA Y., GRAHAM M.J., GROOM S.L., HALE D., KASLIWAL M.M., MASCI F.J., PURDUM J., RACINE B., SOLLERMAN J. and KULKARNI S.R.

Abstract (from CDS):

The detonation of a thin (≲0.03 M) helium shell (He-shell) atop a ∼1 M white dwarf (WD) is a promising mechanism to explain normal Type Ia supernovae (SNe Ia), while thicker He-shells and less massive WDs may explain some recently observed peculiar SNe Ia. We present observations of SN 2020jgb, a peculiar SN Ia discovered by the Zwicky Transient Facility (ZTF). Near maximum brightness, SN 2020jgb is slightly subluminous (ZTF g-band absolute magnitude -18.7 mag ≲ Mg ≲ -18.2 mag depending on the amount of host-galaxy extinction) and shows an unusually red color (0.2 mag ≲ gZTF - rZTF ≲ 0.4 mag) due to strong line-blanketing blueward of ∼5000 Å. These properties resemble those of SN 2018byg, a peculiar SN Ia consistent with an He-shell double detonation (DDet) SN. Using detailed radiative transfer models, we show that the optical spectroscopic and photometric evolution of SN 2020jgb is broadly consistent with a ∼0.95-1.00 M (C/O core + He-shell) progenitor ignited by a ≳0.1 M He-shell. However, one-dimensional radiative transfer models without non-local-thermodynamic-equilibrium treatment cannot accurately characterize the line-blanketing features, making the actual shell mass uncertain. We detect a prominent absorption feature at ∼1 μm in the near-infrared (NIR) spectrum of SN 2020jgb, which might originate from unburnt helium in the outermost ejecta. While the sample size is limited, we find similar 1 μm features in all the peculiar He-shell DDet candidates with NIR spectra obtained to date. SN 2020jgb is also the first peculiar He-shell DDet SN discovered in a star-forming dwarf galaxy, indisputably showing that He-shell DDet SNe occur in both star-forming and passive galaxies, consistent with the normal SN Ia population.

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

Journal keyword(s): Supernovae - Type Ia supernovae - White dwarf stars - Observational astronomy - Surveys

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 OGLE 2013-SN-79 SN* 00 35 10.20 -67 41 08.5           SNI 15 0
2 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1358 4
3 SN 2016hnk SN* 02 13 16.630 -07 39 40.70           SNI 31 0
4 iPTF 13ebh SN* 02 21 59.98 +33 16 13.7           SNIa 44 0
5 SN 2021aefx SN* 04 19 53.400 -54 56 53.09           SNIa 23 0
6 SN 2016dsg SN* 06 07 08.20 -45 10 52.2           SNIpec 8 0
7 SN 2012hn SN* 06 42 42.55 -27 26 49.8           SNIcPec 40 1
8 SN 2018oh SN* 09 06 39.6 +19 20 18           SNIa-norm 73 0
9 SN 1999by SN* 09 21 52.07 +51 00 06.6   13.66       SNIap 292 1
10 SN 2020hvf SN* 11 21 26.450 +03 00 52.85           SNIa 18 0
11 NGC 3923 GiG 11 51 01.783 -28 48 22.36 11.41 10.59 9.80 8.88   ~ 439 1
12 SN 2018aoz SN* 11 51 01.9 -28 44 39           SNIa-norm 25 0
13 SN 2016jhr SN* 12 18 19.850 +00 15 17.38           SNIa 34 0
14 SN 2018byg SN* 12 23 21.57 +46 36 08.3           SNIa-pec 28 0
15 SN 2012cg SN* 12 27 12.83 +09 25 13.2           SNIa-norm 191 1
16 SN 2019yvq SN* 12 27 21.850 +64 47 59.82           SNIa 29 0
17 ASASSN -14bd SN* 12 52 44.8 +26 28 13           SNIa 82 0
18 SN 2011fe SN* 14 03 05.711 +54 16 25.22   10.12 10.06     SNIa-norm 668 1
19 SN 2017cbv SN* 14 32 34.420 -44 08 02.74           SNIa 110 0
20 SN 2019ofm SN* 14 50 54.650 +27 34 57.59           SNIa 5 0
21 SN 2020jgb SN* 17 53 12.651 -00 51 21.81           SNIa 5 0
22 EQ J175312.6+005122.0 G 17 53 12.6630 +00 51 22.078           ~ 1 0
23 SN 2004da SN* 20 22 21.24 +06 25 50.3     15.2     SNIapec 11 1

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