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Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8-501810) as an intermediate polar

Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8-501810) as an intermediate polar
Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8-501810) as an intermediate polar
We report on optical follow-up observations of an X-ray source initially detected by the Einstein Probe mission. Our investigations categorize the source as an intermediate polar, a class of magnetic cataclysmic variables, exhibiting an orbital period of 3.7614(4) hours and a white dwarf spin period of 3.97 minutes. The orbital period was identified through TESS observations, while our high-speed photometric data, obtained using the 1.9m and Lesedi 1.0m telescopes at the South African Astronomical Observatory, revealed both the spin and beat periods. Additionally, we present orbitally phase-resolved spectroscopic observations using the 1.9m telescope, specifically centered on the Hbeta emission line, which reveal two emission components that exhibit Doppler variations throughout the orbital cycle.
astro-ph.HE
Potter, Stephen B.
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Buckley, David A.H.
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Scaringi, S.
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Monageng, I.M.
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Egbo, Okwudili D.
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Charles, Philip A.
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Erasmus, N.
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Gend, Carel van
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Loubser, Egan
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Titus, Keegan
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Rosie, Kathryn
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Gajjar, Hitesh
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Worters, H.L.
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Chandra, Sunil
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Julie, R.P.M.
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Hlakola, Moloko
b6edf7d1-cbde-4b34-b39c-43e721f96baa
Potter, Stephen B.
2a96dd31-566f-4a66-b888-67860ece7fa5
Buckley, David A.H.
c876368b-74ec-45d2-af15-09e8f9e8908f
Scaringi, S.
88701970-a1b9-41fe-bf55-886716ee3374
Monageng, I.M.
c7195666-944f-4be6-93be-c4b9a5426bb4
Egbo, Okwudili D.
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Charles, Philip A.
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Erasmus, N.
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Gend, Carel van
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Loubser, Egan
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Titus, Keegan
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Rosie, Kathryn
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Gajjar, Hitesh
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Worters, H.L.
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Chandra, Sunil
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Julie, R.P.M.
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Hlakola, Moloko
b6edf7d1-cbde-4b34-b39c-43e721f96baa

[Unknown type: UNSPECIFIED]

Record type: UNSPECIFIED

Abstract

We report on optical follow-up observations of an X-ray source initially detected by the Einstein Probe mission. Our investigations categorize the source as an intermediate polar, a class of magnetic cataclysmic variables, exhibiting an orbital period of 3.7614(4) hours and a white dwarf spin period of 3.97 minutes. The orbital period was identified through TESS observations, while our high-speed photometric data, obtained using the 1.9m and Lesedi 1.0m telescopes at the South African Astronomical Observatory, revealed both the spin and beat periods. Additionally, we present orbitally phase-resolved spectroscopic observations using the 1.9m telescope, specifically centered on the Hbeta emission line, which reveal two emission components that exhibit Doppler variations throughout the orbital cycle.

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2405.01996v1 - Author's Original
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Accepted/In Press date: 3 May 2024
Additional Information: 5 pages, 9 figures accepted in MNRAS letters
Keywords: astro-ph.HE
Learn more about Physics & Astronomy research Learn more about School of Physics and Astronomy research

Identifiers

Local EPrints ID: 490760
URI: http://eprints.soton.ac.uk/id/eprint/490760
DOI: doi:10.48550/arXiv.2405.01996
PURE UUID: 747f8b7b-07ec-4a0b-ba8e-6bb2f1ec51a1

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Date deposited: 06 Jun 2024 16:37
Last modified: 06 Jun 2024 16:37

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Contributors

Author: Stephen B. Potter
Author: David A.H. Buckley
Author: S. Scaringi
Author: I.M. Monageng
Author: Okwudili D. Egbo
Author: Philip A. Charles
Author: N. Erasmus
Author: Carel van Gend
Author: Egan Loubser
Author: Keegan Titus
Author: Kathryn Rosie
Author: Hitesh Gajjar
Author: H.L. Worters
Author: Sunil Chandra
Author: R.P.M. Julie
Author: Moloko Hlakola

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