SIMBAD references

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

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2019ApJ...877L...4S and select 'bookmark this link' or equivalent in the popup menu


2021.12.07-08:01:51

© Université de Strasbourg/CNRS

    • Contact