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The changing-look optical wind of the flaring X-ray transient swift J1858.6-0814

The changing-look optical wind of the flaring X-ray transient swift J1858.6-0814
The changing-look optical wind of the flaring X-ray transient swift J1858.6-0814

We present the discovery of an optical accretion disk wind in the X-ray transient Swift J1858.6-0814. Our 90-spectrum data set, taken with the 10.4 m Gran Telescopio Canarias telescope over eight different epochs and across five months, reveals the presence of conspicuous P-Cyg profiles in He i at 5876 Å and Hα. These features are detected throughout the entire campaign, albeit their intensity and main observational properties are observed to vary on timescales as short as 5 minutes. In particular, we observe significant variations in the wind velocity, between a few hundreds and ∼2400 km s -1. In agreement with previous reports, our observations are characterized by the presence of frequent flares, although the relation between the continuum flux variability and the presence/absence of wind features is not evident. The reported high activity of the system at radio waves indicates that the optical wind of Swift J1858.6-0814 is contemporaneous with the radio jet, as is the case for the handful of X-ray binary transients that have shown so far optical P-Cyg profiles. Finally, we compare our results with those of other sources showing optical accretion disk winds, with emphasis on V404 Cyg and V4641 Sgr, since they also display strong and variable optical wind features as well as similar flaring behavior.

1108, 1579, 1611, 1636, 1811
2041-8205
Muñoz-Darias, T.
3ce85aef-763c-4783-a13e-586115731bc2
Armas Padilla, M.
2b9cda10-baaa-4ca2-bf06-0a40bd163613
Jiménez-Ibarra, F.
36575099-5a2b-4b8b-aa1d-52ac905eb538
Panizo-Espinar, G.
f30599f9-30db-4558-9ba7-f4a7d6eddedd
Casares, J.
b36492e0-a175-4960-9634-3e64a01fc5ac
Altamirano, D.
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Buisson, D. J. K.
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Castro Segura, N.
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Cúneo, V. A.
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Degenaar, N.
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Fogantini, F. A.
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Knigge, C.
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Mata Sánchez, D.
a068dac9-054d-4217-b72a-2595acd51f36
Özbey Arabaci, M.
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Sánchez-Sierras, J.
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Torres, M. A. P.
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van den Eijnden, J.
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Vincentelli, F. M.
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Muñoz-Darias, T.
3ce85aef-763c-4783-a13e-586115731bc2
Armas Padilla, M.
2b9cda10-baaa-4ca2-bf06-0a40bd163613
Jiménez-Ibarra, F.
36575099-5a2b-4b8b-aa1d-52ac905eb538
Panizo-Espinar, G.
f30599f9-30db-4558-9ba7-f4a7d6eddedd
Casares, J.
b36492e0-a175-4960-9634-3e64a01fc5ac
Altamirano, D.
d5ccdb09-0b71-4303-9538-05b467be075b
Buisson, D. J. K.
f96b1210-d056-4948-9e4a-deeb669e6d1a
Castro Segura, N.
26dfa223-df20-4ae1-98cc-7900dfe49fa3
Cúneo, V. A.
a1e4049c-b346-4725-9bd1-acdc71fa2db8
Degenaar, N.
54149051-d74e-4e43-a7cd-501ec4023511
Fogantini, F. A.
e0f2ad89-d471-4d15-8968-4664278cc617
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Mata Sánchez, D.
a068dac9-054d-4217-b72a-2595acd51f36
Özbey Arabaci, M.
a4273808-63b5-4b62-879c-850093fab95b
Sánchez-Sierras, J.
4a7c88d9-4415-4eb7-9bb8-d4a07e7ac5da
Torres, M. A. P.
e7b42f8b-33a2-47bb-94b5-cad7d50a1177
van den Eijnden, J.
abb08069-7f5c-430a-a68f-6ff0bb0d920a
Vincentelli, F. M.
6059e516-6e7a-4d18-afa4-c5b68a3b207a

Muñoz-Darias, T., Armas Padilla, M., Jiménez-Ibarra, F., Panizo-Espinar, G., Casares, J., Altamirano, D., Buisson, D. J. K., Castro Segura, N., Cúneo, V. A., Degenaar, N., Fogantini, F. A., Knigge, C., Mata Sánchez, D., Özbey Arabaci, M., Sánchez-Sierras, J., Torres, M. A. P., van den Eijnden, J. and Vincentelli, F. M. (2020) The changing-look optical wind of the flaring X-ray transient swift J1858.6-0814. The Astrophysical Journal Letters, 893 (1), [L19]. (doi:10.3847/2041-8213/ab8381).

Record type: Article

Abstract

We present the discovery of an optical accretion disk wind in the X-ray transient Swift J1858.6-0814. Our 90-spectrum data set, taken with the 10.4 m Gran Telescopio Canarias telescope over eight different epochs and across five months, reveals the presence of conspicuous P-Cyg profiles in He i at 5876 Å and Hα. These features are detected throughout the entire campaign, albeit their intensity and main observational properties are observed to vary on timescales as short as 5 minutes. In particular, we observe significant variations in the wind velocity, between a few hundreds and ∼2400 km s -1. In agreement with previous reports, our observations are characterized by the presence of frequent flares, although the relation between the continuum flux variability and the presence/absence of wind features is not evident. The reported high activity of the system at radio waves indicates that the optical wind of Swift J1858.6-0814 is contemporaneous with the radio jet, as is the case for the handful of X-ray binary transients that have shown so far optical P-Cyg profiles. Finally, we compare our results with those of other sources showing optical accretion disk winds, with emphasis on V404 Cyg and V4641 Sgr, since they also display strong and variable optical wind features as well as similar flaring behavior.

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More information

Accepted/In Press date: 24 March 2020
Published date: 13 April 2020
Keywords: 1108, 1579, 1611, 1636, 1811

Identifiers

Local EPrints ID: 447953
URI: http://eprints.soton.ac.uk/id/eprint/447953
ISSN: 2041-8205
PURE UUID: c3a415b3-e799-40c4-af9c-796db5f04545
ORCID for D. Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 26 Mar 2021 17:33
Last modified: 27 Mar 2021 02:47

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Contributors

Author: T. Muñoz-Darias
Author: M. Armas Padilla
Author: F. Jiménez-Ibarra
Author: G. Panizo-Espinar
Author: J. Casares
Author: D. Altamirano ORCID iD
Author: D. J. K. Buisson
Author: V. A. Cúneo
Author: N. Degenaar
Author: F. A. Fogantini
Author: C. Knigge
Author: D. Mata Sánchez
Author: M. Özbey Arabaci
Author: J. Sánchez-Sierras
Author: M. A. P. Torres
Author: J. van den Eijnden

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