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Searching for swept-up hydrogen and helium in the late-time spectra of 11 nearby Type Ia supernovae

Searching for swept-up hydrogen and helium in the late-time spectra of 11 nearby Type Ia supernovae
Searching for swept-up hydrogen and helium in the late-time spectra of 11 nearby Type Ia supernovae
The direct detection of a stellar system that explodes as a Type Ia supernova (SN Ia) has not yet been successful. Various indirect methods have been used to investigate SN Ia progenitor systems but none have produced conclusive results. A prediction of single-degenerate models is that H- (or He-) rich material from the envelope of the companion star should be swept up by the SN ejecta in the explosion. Seven SNe Ia have been analysed to date looking for signs of H-rich material in their late-time spectra and none were detected. We present results from new late-time spectra of 11 SNe Ia obtained at the Very Large Telescope using XShooter and FORS2. We present the tentative detection of H? emission for SN 2013ct, corresponding to ?0.007 M? of stripped/ablated companion star material (under the assumptions of the spectral modelling). This mass is significantly lower than expected for single-degenerate scenarios, suggesting that >0.1 M? of H-rich is present but not observed. We do not detect H? emission in the other 10 SNe Ia. This brings the total sample of normal SNe Ia with non-detections (<0.001–0.058 M?) of H-rich material to 17 events. The simplest explanation for these non-detections is that these objects did not result from the explosion of a CO white dwarf accreting matter from a H-rich companion star via Roche lobe overflow or symbiotic channels. However, further spectral modelling is needed to confirm this. We also find no evidence of He-emission features, but models with He-rich companion stars are not available to place mass limits.
0035-8711
3254-3265
Maguire, K.
94dfab90-b220-454f-8d2a-4ab4ffe27c65
Taubenberger, S.
a81f550f-8713-4f0a-9205-34ae5078f88d
Sullivan, M.
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Mazzali, P.A.
8935b659-9ccd-40c9-bea3-82faf50115b5
Maguire, K.
94dfab90-b220-454f-8d2a-4ab4ffe27c65
Taubenberger, S.
a81f550f-8713-4f0a-9205-34ae5078f88d
Sullivan, M.
2f31f9fa-8e79-4b35-98e2-0cb38f503850
Mazzali, P.A.
8935b659-9ccd-40c9-bea3-82faf50115b5

Maguire, K., Taubenberger, S., Sullivan, M. and Mazzali, P.A. (2016) Searching for swept-up hydrogen and helium in the late-time spectra of 11 nearby Type Ia supernovae. Monthly Notices of the Royal Astronomical Society, 457 (3), 3254-3265. (doi:10.1093/mnras/stv2991).

Record type: Article

Abstract

The direct detection of a stellar system that explodes as a Type Ia supernova (SN Ia) has not yet been successful. Various indirect methods have been used to investigate SN Ia progenitor systems but none have produced conclusive results. A prediction of single-degenerate models is that H- (or He-) rich material from the envelope of the companion star should be swept up by the SN ejecta in the explosion. Seven SNe Ia have been analysed to date looking for signs of H-rich material in their late-time spectra and none were detected. We present results from new late-time spectra of 11 SNe Ia obtained at the Very Large Telescope using XShooter and FORS2. We present the tentative detection of H? emission for SN 2013ct, corresponding to ?0.007 M? of stripped/ablated companion star material (under the assumptions of the spectral modelling). This mass is significantly lower than expected for single-degenerate scenarios, suggesting that >0.1 M? of H-rich is present but not observed. We do not detect H? emission in the other 10 SNe Ia. This brings the total sample of normal SNe Ia with non-detections (<0.001–0.058 M?) of H-rich material to 17 events. The simplest explanation for these non-detections is that these objects did not result from the explosion of a CO white dwarf accreting matter from a H-rich companion star via Roche lobe overflow or symbiotic channels. However, further spectral modelling is needed to confirm this. We also find no evidence of He-emission features, but models with He-rich companion stars are not available to place mass limits.

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Accepted/In Press date: 14 December 2015
e-pub ahead of print date: 22 February 2016
Published date: 11 April 2016
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 394621
URI: https://eprints.soton.ac.uk/id/eprint/394621
ISSN: 0035-8711
PURE UUID: 11175678-f2a1-4606-a116-2221427b0b65
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 23 May 2016 07:58
Last modified: 06 Jun 2018 12:27

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Contributors

Author: K. Maguire
Author: S. Taubenberger
Author: M. Sullivan ORCID iD
Author: P.A. Mazzali

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