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Constraining the progenitor companion of the nearby Type Ia SN 2011fe with a nebular spectrum at +981 d

Constraining the progenitor companion of the nearby Type Ia SN 2011fe with a nebular spectrum at +981 d
Constraining the progenitor companion of the nearby Type Ia SN 2011fe with a nebular spectrum at +981 d
We present an optical nebular spectrum of the nearby Type Ia supernova 2011fe, obtained 981 d after explosion. SN 2011fe exhibits little evolution since the +593 d optical spectrum, but there are several curious aspects in this new extremely late-time regime. We suggest that the persistence of the ?5800 Å feature is due to Na?I D, and that a new emission feature at ?7300 Å may be [Ca?II]. Also, we discuss whether the new emission feature at ?6400 Å might be [Fe?I] or the high-velocity hydrogen predicted by Mazzali et al. The nebular feature at 5200 Å exhibits a linear velocity evolution of ?350 km?s? 1 per 100 d from at least +220 to +980 d, but the line's shape also changes in this time, suggesting that line blending contributes to the evolution. At ?1000 d after explosion, flux from the SN has declined to a point where contribution from a luminous secondary could be detected. In this work, we make the first observational tests for a post-impact remnant star and constrain its temperature and luminosity to T ? 104?K?and?L?? 104?L?. Additionally, we do not see any evidence for narrow H ? emission in our spectrum. We conclude that observations continue to strongly exclude many single-degenerate scenarios for SN 2011fe.
0035-8711
1948-1957
Graham, M.L.
7b19a85f-725f-4909-9659-28f8016e7d7c
Nugent, P.E.
f0687239-eb10-4873-8722-df0ba0b4e228
Sullivan, M.
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Filippenko, A.V.
2a482e67-7977-4429-8c98-c6589e650765
Cenko, S.B.
7b4d19e5-1c26-469f-bfd2-be03a2c37c14
Silverman, J.M.
08ab21a1-fe06-4cc0-87f3-94f62d7fff2a
Clubb, K.I.
1ebdcde6-7529-4b63-a494-a93e4c5a8dc2
Zheng, W.
1158fbd9-706d-4755-a934-e0300c538a2a
Graham, M.L.
7b19a85f-725f-4909-9659-28f8016e7d7c
Nugent, P.E.
f0687239-eb10-4873-8722-df0ba0b4e228
Sullivan, M.
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Filippenko, A.V.
2a482e67-7977-4429-8c98-c6589e650765
Cenko, S.B.
7b4d19e5-1c26-469f-bfd2-be03a2c37c14
Silverman, J.M.
08ab21a1-fe06-4cc0-87f3-94f62d7fff2a
Clubb, K.I.
1ebdcde6-7529-4b63-a494-a93e4c5a8dc2
Zheng, W.
1158fbd9-706d-4755-a934-e0300c538a2a

Graham, M.L., Nugent, P.E., Sullivan, M., Filippenko, A.V., Cenko, S.B., Silverman, J.M., Clubb, K.I. and Zheng, W. (2015) Constraining the progenitor companion of the nearby Type Ia SN 2011fe with a nebular spectrum at +981 d. Monthly Notices of the Royal Astronomical Society, 454 (2), 1948-1957. (doi:10.1093/mnras/stv1888).

Record type: Article

Abstract

We present an optical nebular spectrum of the nearby Type Ia supernova 2011fe, obtained 981 d after explosion. SN 2011fe exhibits little evolution since the +593 d optical spectrum, but there are several curious aspects in this new extremely late-time regime. We suggest that the persistence of the ?5800 Å feature is due to Na?I D, and that a new emission feature at ?7300 Å may be [Ca?II]. Also, we discuss whether the new emission feature at ?6400 Å might be [Fe?I] or the high-velocity hydrogen predicted by Mazzali et al. The nebular feature at 5200 Å exhibits a linear velocity evolution of ?350 km?s? 1 per 100 d from at least +220 to +980 d, but the line's shape also changes in this time, suggesting that line blending contributes to the evolution. At ?1000 d after explosion, flux from the SN has declined to a point where contribution from a luminous secondary could be detected. In this work, we make the first observational tests for a post-impact remnant star and constrain its temperature and luminosity to T ? 104?K?and?L?? 104?L?. Additionally, we do not see any evidence for narrow H ? emission in our spectrum. We conclude that observations continue to strongly exclude many single-degenerate scenarios for SN 2011fe.

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Accepted/In Press date: 12 August 2015
e-pub ahead of print date: 13 October 2015
Published date: 1 December 2015
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 394614
URI: https://eprints.soton.ac.uk/id/eprint/394614
ISSN: 0035-8711
PURE UUID: 6c02d7ee-e6e9-4106-9455-779935e457b0
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 20 May 2016 16:00
Last modified: 31 Jul 2019 00:34

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