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The 1989 and 2015 outbursts of V404 Cygni: a global study of wind-related optical features

The 1989 and 2015 outbursts of V404 Cygni: a global study of wind-related optical features
The 1989 and 2015 outbursts of V404 Cygni: a global study of wind-related optical features
The black hole transient V404 Cygni exhibited a bright outburst in June 2015 that was intensively followed over a wide range of wavelengths. Our team obtained high time resolution optical spectroscopy (⁠∼90 s), which included a detailed coverage of the most active phase of the event. We present a data base consisting of 651 optical spectra obtained during this event, that we combine with 58 spectra gathered during the fainter December 2015 sequel outburst, as well as with 57 spectra from the 1989 event. We previously reported the discovery of wind-related features (P-Cygni and broad-wing line profiles) during both 2015 outbursts. Here, we build diagnostic diagrams that enable us to study the evolution of typical emission line parameters, such as line fluxes and equivalent widths, and develop a technique to systematically detect outflow signatures. We find that these are present throughout the outburst, even at very low optical fluxes, and that both types of outflow features are observed simultaneously in some spectra, confirming the idea of a common origin. We also show that the nebular phases depict loop patterns in many diagnostic diagrams, while P-Cygni profiles are highly variable on time-scales of minutes. The comparison between the three outbursts reveals that the spectra obtained during June and December 2015 share many similarities, while those from 1989 exhibit narrower emission lines and lower wind terminal velocities. The diagnostic diagrams presented in this work have been produced using standard measurement techniques and thus may be applied to other active low-mass X-ray binaries.
0035-8711
2646-2665
Mata Sánchez, D.
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Muñoz-darias, T.
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Casares, J.
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Charles, P.A.
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Armas Padilla, M.
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Fernández-Ontiveros, J.A.
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Jiménez-Ibarra, F.
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Jonker, P G
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Linares, M.
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Torres, M.A.P.
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Shaw, A.W.
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Rodríguez-Gil, P.
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Van Grunsven, T.
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Blay, P.
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Ferragamo, A.
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Lopez-Martinez, F.
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Rubiño-Martin, J.A.
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Suárez-Andrés, L.
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Mata Sánchez, D.
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Muñoz-darias, T.
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Casares, J.
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Charles, P.A.
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Armas Padilla, M.
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Fernández-Ontiveros, J.A.
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Jiménez-Ibarra, F.
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Jonker, P G
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Linares, M.
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Torres, M.A.P.
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Shaw, A.W.
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Rodríguez-Gil, P.
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Van Grunsven, T.
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Blay, P.
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Castro-Tirado, A.
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Chinchilla, P.
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Farina, C.
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Ferragamo, A.
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Lopez-Martinez, F.
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Rubiño-Martin, J.A.
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Suárez-Andrés, L.
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Mata Sánchez, D., Muñoz-darias, T., Casares, J., Charles, P.A., Armas Padilla, M., Fernández-Ontiveros, J.A., Jiménez-Ibarra, F., Jonker, P G, Linares, M., Torres, M.A.P., Shaw, A.W., Rodríguez-Gil, P., Van Grunsven, T., Blay, P., Caballero-García, M.D., Castro-Tirado, A., Chinchilla, P., Farina, C., Ferragamo, A., Lopez-Martinez, F., Rubiño-Martin, J.A. and Suárez-Andrés, L. (2018) The 1989 and 2015 outbursts of V404 Cygni: a global study of wind-related optical features. Monthly Notices of the Royal Astronomical Society, 481 (2), 2646-2665. (doi:10.1093/mnras/sty2402).

Record type: Article

Abstract

The black hole transient V404 Cygni exhibited a bright outburst in June 2015 that was intensively followed over a wide range of wavelengths. Our team obtained high time resolution optical spectroscopy (⁠∼90 s), which included a detailed coverage of the most active phase of the event. We present a data base consisting of 651 optical spectra obtained during this event, that we combine with 58 spectra gathered during the fainter December 2015 sequel outburst, as well as with 57 spectra from the 1989 event. We previously reported the discovery of wind-related features (P-Cygni and broad-wing line profiles) during both 2015 outbursts. Here, we build diagnostic diagrams that enable us to study the evolution of typical emission line parameters, such as line fluxes and equivalent widths, and develop a technique to systematically detect outflow signatures. We find that these are present throughout the outburst, even at very low optical fluxes, and that both types of outflow features are observed simultaneously in some spectra, confirming the idea of a common origin. We also show that the nebular phases depict loop patterns in many diagnostic diagrams, while P-Cygni profiles are highly variable on time-scales of minutes. The comparison between the three outbursts reveals that the spectra obtained during June and December 2015 share many similarities, while those from 1989 exhibit narrower emission lines and lower wind terminal velocities. The diagnostic diagrams presented in this work have been produced using standard measurement techniques and thus may be applied to other active low-mass X-ray binaries.

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The 1989 and 2015 outbursts of V404 Cygni- a global study of wind-related optical features - Accepted Manuscript
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Accepted/In Press date: 30 August 2018
e-pub ahead of print date: 4 September 2018
Published date: 1 December 2018

Identifiers

Local EPrints ID: 427329
URI: http://eprints.soton.ac.uk/id/eprint/427329
ISSN: 0035-8711
PURE UUID: ad054527-1d45-42c4-bb61-0d2efddb3e0d

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Date deposited: 14 Jan 2019 17:30
Last modified: 06 Oct 2020 22:37

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Contributors

Author: D. Mata Sánchez
Author: T. Muñoz-darias
Author: J. Casares
Author: P.A. Charles
Author: M. Armas Padilla
Author: J.A. Fernández-Ontiveros
Author: F. Jiménez-Ibarra
Author: P G Jonker
Author: M. Linares
Author: M.A.P. Torres
Author: A.W. Shaw
Author: P. Rodríguez-Gil
Author: T. Van Grunsven
Author: P. Blay
Author: M.D. Caballero-García
Author: A. Castro-Tirado
Author: P. Chinchilla
Author: C. Farina
Author: A. Ferragamo
Author: F. Lopez-Martinez
Author: J.A. Rubiño-Martin
Author: L. Suárez-Andrés

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