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NGTS and HST insights into the long-period modulation in GW Librae

Chote, P. and Gänsicke, Boris T. and McCormac, J and Aungwerojwit, A. and Bayliss, D. and Burleigh, M. and Casewell, S and Eigmüller, Philipp and Gill, S. and Goad, M and Hermes, J.J. and Jenkins, J. S. and Mukadam, A.S. and Poshyachinda, S. and Raynard, L. and Reichart, D.E. and Szkody, P. and Toloza, O. and West, R. and Wheatley, P. (2021) NGTS and HST insights into the long-period modulation in GW Librae. Monthly Notices of the Royal Astronomical Society, 502 (1), pp. 581-588. Oxford University Press. doi: 10.1093/mnras/staa4015. ISBN 10.1093/mnras/staa4015. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/502/1/581/6081035

Abstract

Light curves of the accreting white dwarf pulsator GW Librae spanning a 7.5-month period in 2017 were obtained as part of the Next- Generation Transit Survey. This data set comprises 787 h of photometry from 148 clear nights, allowing the behaviour of the long (hours) and short-period (20 min) modulation signals to be tracked from night to night over a much longer observing baseline than has been previously achieved. The long-period modulations intermittently detected in previous observations of GW Lib are found to be a persistent feature, evolving between states with periods ≃ 83 min and 2-4 h on time-scales of several days. The 20 min signal is found to have a broadly stable amplitude and frequency for the duration of the campaign, but the previously noted phase instability is confirmed. Ultraviolet observations obtained with the Cosmic Origin Spectrograph on- board the Hubble Space Telescope constrain the ultraviolet-to- optical flux ratio to ≃5 for the 4 h modulation, and \ensuremath≲1 for the 20 min period, with caveats introduced by non-simultaneous observations. These results add further observational evidence that these enigmatic signals must originate from the white dwarf, highlighting our continued gap in theoretical understanding of the mechanisms that drive them.

Item URL in elib:https://elib.dlr.de/142357/
Document Type:Article
Title:NGTS and HST insights into the long-period modulation in GW Librae
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Chote, P.Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Gänsicke, Boris T.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
McCormac, JAstrophysics Research Centre, School of Mathematics &UNSPECIFIED
Aungwerojwit, A.Department of Physics, Faculty of Science, Naresuan University, Phitsanulok 65000, ThailandUNSPECIFIED
Bayliss, D.Universite de Geneve, SwitzerlandUNSPECIFIED
Burleigh, M.Department of Physics, University of Warwick, UKUNSPECIFIED
Casewell, Sdepartment of physics, university of warwick, ukUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Gill, S.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIED
Goad, MDepartment of Physics & Astronomy, University of LeicesterUNSPECIFIED
Hermes, J.J.Department of Astronomy, Boston University, Boston, MA 02215, USAUNSPECIFIED
Jenkins, J. S.Universidad de Chile, ChileUNSPECIFIED
Mukadam, A.S.Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USAUNSPECIFIED
Poshyachinda, S.National Astronomical Research Institute of Thailand (Public Organization), Chiangmai, 50180, ThailandUNSPECIFIED
Raynard, L.Department of Physics and Astronomy, Leicester Institute of Space and Earth Observation, University of Leicester, Leicester, LE1 7RH, UKUNSPECIFIED
Reichart, D.E.University of North Carolina, Chapel Hill, NC 27514, USAUNSPECIFIED
Szkody, P.Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USAUNSPECIFIED
Toloza, O.Department of Physics, University of Warwick, Coventry CV4 7AL, UKUNSPECIFIED
West, R.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CAUNSPECIFIED
Wheatley, P.Department of Physics, University of Warwick, UKUNSPECIFIED
Date:March 2021
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:502
DOI :10.1093/mnras/staa4015
Page Range:pp. 581-588
Publisher:Oxford University Press
ISSN:0035-8711
ISBN:10.1093/mnras/staa4015
Status:Published
Keywords:stars: dwarf novae, stars: individual: GW Librae, stars: variables: general, white dwarfs, Astrophysics - Solar and Stellar Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Eigmüller, Dr. Philipp
Deposited On:21 May 2021 07:22
Last Modified:29 Jun 2021 11:01

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