2019ApJ...877L...4S


Query : 2019ApJ...877L...4S

2019ApJ...877L...4S - Astrophys. J., 877, L4-L4 (2019/May-3)

Nebular Hα limits for fast declining SNe Ia.

SAND D.J., AMARO R.C., MOE M., GRAHAM M.L., ANDREWS J.E., BURKE J., CARTIER R., EWEIS Y., GALBANY L., HIRAMATSU D., HOWELL D.A., JHA S.W., LUNDQUIST M., MATHESON T., McCULLY C., MILNE P., SMITH N., VALENTI S. and WYATT S.

Abstract (from CDS):

One clear observational prediction of the single-degenerate progenitor scenario as the origin of type Ia supernovae (SNe) is the presence of relatively narrow (≃1000 km s–1) Hα emission at nebular phases, although this feature is rarely seen. We present a compilation of nebular phase Hα limits for SN Ia in the literature and demonstrate that this heterogenous sample has been biased toward SN Ia with relatively high luminosities and slow decline rates, as parameterized by Δm15(B), the difference in B-band magnitude between maximum light and 15 days afterward. Motivated by the need to explore the full parameter space of SN Ia and their subtypes, we present two new and six previously published nebular spectra of SN Ia with Δm15(B) > 1.3 mag (including members of the transitional and SN1991bg-like subclasses) and measure nondetection limits of L < 0.85-9.9 x 1036 erg s–1, which we confirmed by implanting simulated Hα emission into our data. Based on the latest models of swept-up material stripped from a nondegenerate companion star, these L values correspond to hydrogen mass limits of MH <= 1-3 x 10–4 M, which are roughly three orders of magnitude below that expected for the systems modeled, although we note that no simulations of Hα nebular emission in such weak explosions have yet been performed. Despite the recent detection of strong Hα in ASASSN-18tb (SN 2018fhw; Δm15(B) = 2.0 mag), we see no evidence that fast-declining systems are more likely to have late time Hα emission, although a larger sample is needed to confirm this result.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): supernovae: general

Simbad objects: 31

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Number of rows : 31
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 SN 2013ct SN* 01 12 54.92 +00 58 45.7           SNIa 19 1
2 SN 2011ek SN* 02 25 48.89 +18 32 00.0   13.84 13.66     SNIapec: 27 1
3 SN 2003gs SN* 02 27 38.36 -01 09 35.4     14.0     SNIap 53 1
4 SN 2009ig SN* 02 38 11.62 -01 18 45.3           SNIa 139 1
5 SN 2003hv SN* 03 04 09.32 -26 05 07.5     12.5     SNIa 114 1
6 SN 2012fr SN* 03 33 35.99 -36 07 37.7           SNIa 125 1
7 SN 2007on SN* 03 38 50.90 -35 34 30.0       14.9   SNIa 122 1
8 SN 2011iv SN* 03 38 51.35 -35 35 32.0           SNIa 66 1
9 SN 2013gy SN* 03 42 16.88 -04 43 18.5           SNIa 35 1
10 SN 2001el SN* 03 44 30.60 -44 38 23.4   12.81       SNIa 255 1
11 6dFGS gJ041752.2-634031 GiG 04 17 52.1537504664 -63 40 30.731313900   14.37   12.82   ~ 14 0
12 2MASX J04180598-6336523 G 04 18 06.0048404832 -63 36 51.811481592           ~ 7 0
13 SN 2018fhw SN* 04 18 06.266 -63 36 54.25           SNIa 32 0
14 SN 2017fzw SN* 06 21 34.770 -27 12 53.51           SNIa 10 0
15 SN 2018oh SN* 09 06 39.592 +19 20 17.47           ~ 55 0
16 SN 2005am SN* 09 16 12.47 -16 18 16.0     17.5     SNIa 106 1
17 SN 1999by SN* 09 21 52.07 +51 00 06.6   13.66       SNIap 277 1
18 SN 2014J SN* 09 55 42.12 +69 40 25.9           SNIa 374 1
19 SN 2012ht SN* 10 53 22.75 +16 46 34.9           SNIa 57 1
20 SN 2007gi SN* 12 01 23.42 +61 53 33.8     16.3     SNIa 41 1
21 SN 2012cg SN* 12 27 12.83 +09 25 13.2           SNIa 164 1
22 SN 2012cu SN* 12 53 29.35 +02 09 39.0           SNIa 22 2
23 SN 2013cs SN* 13 15 14.81 -17 57 55.6           SNIa 18 1
24 SN 1986G SN* 13 25 36.46 -43 01 53.6   12.45 11.44     SNIapec 399 1
25 SN 2011fe SN* 14 03 05.711 +54 16 25.22   10.12 10.06     SNIa 610 1
26 SN 2013aa SN* 14 32 33.88 -44 13 27.8           SNIa 47 1
27 SN 2017cbv SN* 14 32 34.420 -44 08 02.74           SNIa 77 0
28 SN 2005cf SN* 15 21 33.12 -07 26 57.1   13.54       SNIa 265 1
29 SN 2010gp SN* 16 52 57.39 +02 23 16.4           SNIa 13 1
30 SN 2004eo SN* 20 32 54.19 +09 55 42.7   15.07 17.8     SNIa 192 1
31 SN 2016brx SN* 22 50 34.03 -01 32 32.5           SNIa 8 0

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2022.11.30-17:13:49

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