145 citations · 1.4k across the 68 of their papers we have counts for
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The instantaneous mass accretion rate of novae in quiescence: - an archival ultraviolet optical spectral analysis
Patrick Godon, Edward M. Sion, Tim Naylor +1
Based on archival spectra, we derive the quiescent instantaneous mass transfer rates in novae using synthetic disk spectra generated with tlusty, Gaia parallax-derived distances, a…
The Accelerating Decline of the Mass Transfer Rate in the Recurrent Nova T Pyxidis
P. Godon, E. M. Sion, R. E. Williams +3
The recurrent nova T Pyxidis has erupted six times since 1890, with its last outburst in 2011, and the relatively short recurrence time between classical nova explosions indicates…
Hubble Space Telescope STIS Spectroscopy of Nova T Aurigae 1891
Conor Larsen, Patrick Godon, Edward Sion
T Aurigae is an eclipsing old nova which exploded in 1891. At a Gaia EDR3 distance of 815-871 pc, it is a relatively nearby old nova. Through ultraviolet spectral modeling and usin…
White Dwarf Photospheric Abundances in Cataclysmic Variables -- II. White Dwarfs With and Without a Mask
Patrick Godon, Edward M. Sion
Taking advantage of the now available Gaia EDR3 parallaxes, we carry out an archival {\it Hubble Space Telescope} (HST) far ultraviolet spectroscopic analysis of 10 cataclysmic var…
Constraining the Evolution of Cataclysmic Variables via the Masses and Accretion Rates of their Underlying White Dwarfs
A. F. Pala, B. T. Gänsicke, D. Belloni +28
We report on the masses (), effective temperatures () and secular mean accretion rates () of 43 cataclysmic variable (CV) wh…
The Heating and Pulsations of V386 Serpentis after its 2019 Dwarf Nova Outburst
Paula Szkody, Patrick Godon, Boris T. Gaensicke +10
Following the pulsation spectrum of a white dwarf through the heating and cooling involved in a dwarf nova outburst cycle provides a unique view of the changes to convective drivin…
White Dwarf Photospheric Abundances in Cataclysmic Variables: I. SS Aurigae and TU Mensae
Patrick Godon, Edward Sion
Chemical abundances studies of cataclysmic variables have revealed high nitrogen to carbon ratios in a number of of cataclysmic variable white dwarfs (based on ultraviolet emission…
The hydrogen Balmer lines and jump in absorption in accretion disc modeling -- an ultraviolet-optical spectral analysis of the dwarf novae UZ Serpentis and CY Lyrae
Patrick Godon, Edward M. Sion, Paula Szkody +1
The spectra of disc-dominated cataclysmic variables (CVs) often deviate from the spectra of accretion disc models; in particular, the Balmer jump and absorption lines are found to…
Fuse and IUE Spectroscopy of the Prototype Dwarf Nova ER Ursa Majoris During Quiescence
Giannina Guzman, Edward Sion, Patrick Godon
ER Ursae Majoris is the prototype for a subset of SU UMa-type dwarf novae characterized by short cycle times between outburst, high outburst frequency, and ``negative'' superhumps.…
FUSE Spectroscopic Analysis of the Slowest Symbiotic Nova AG Peg During Quiescence
Edward M. Sion, Patrick Godon, Joanna Mikolajewska +1
We present a far ultraviolet spectroscopic analysis of the slowest known symbiotic nova AG Peg (M3/4III giant + hot white dwarf; P = 818.4 days) which underwent a nova explosion in…
HST FUV spectroscopy of the short orbital period recurrent nova CI Aql: Implications for white dwarf mass evolution
Edward M. Sion, R. E. Wilson, Patrick Godon +3
An HST COS Far UV spectrum (1170 A to 1800 A) was obtained for the short orbital period recurrent novae (T Pyxidis subclass), CI Aquilae. CI Aql is the only classical CV known to h…
L1 Stream Deflection and Ballistic Launching at the Disk Bow Shock: An Absorption-line Velocity Analysis in Semi-detached Binaries
Patrick Godon
Observations of semi-detached interacting binaries reveal orbital modulation indicating the presence of absorbing material obscuring the disk and accreting primary star at specific…
Evidence for mass accretion driven by spiral shocks onto the white dwarf in SDSS J123813.73-033933.0
A. F. Pala, B. T. Gänsicke, T. R. Marsh +21
We present high-time-resolution photometry and phase-resolved spectroscopy of the short-period () cataclysmic variable SDSS J123813.73-033933.…
The Long-Term Secular Mass Accretion Rate of the Recurrent Nova T Pyxidis
Patrick Godon, Edward Sion, Robert Williams +1
We present Hubble Space Telescope ultraviolet spectroscopy of the recurrent nova T Pyxidis obtained more than 5 years after its 2011 outburst indicating that the system might not h…
HST/COS Far Ultraviolet Spectroscopic Analysis of U Geminorum Following a Wide Outburst
Patrick Godon, Michael M. Shara, Edward M. Sion +1
We have used HST/COS to obtain a series of 4 FUV (915-2148A) spectroscopic observations of the prototypical dwarf nova U Geminorum during its cooling following a two-week outburst.…
No Neon, but Jets in the Remarkable Recurrent Nova M31N 2008-12a? - Hubble Space Telescope Spectroscopy of the 2015 Eruption
M. J. Darnley, R. Hounsell, P. Godon +14
The 2008 discovery of an eruption of M31N 2008-12a began a journey on which the true nature of this remarkable recurrent nova continues to be revealed. M31N 2008-12a contains a whi…
Modifying the Standard Disk Model for the Ultraviolet Spectral Analysis of Disk-dominated Cataclysmic Variables. I. The Novalikes MV Lyrae, BZ Camelopardalis, and V592 Cassiopeiae
Patrick Godon, Edward M. Sion, Solen Balman +1
The standard disk is often inadequate to model disk-dominated cataclysmic variables (CVs) and generates a spectrum that is bluer than the observed UV spectra [Puebla et al 2007]. X…
FUSE Spectroscopy of the Accreting Hot Components in Symbiotic Variables
Edward Sion, Patrick Godon, Joanna Mikolajewska +2
We have conducted a spectroscopic analysis of the far ultraviolet archival spectra of four symbiotic variables, EG And, AE Ara, CQ Dra and RW Hya. RW Hya and EG And have never had…
Hubble Space Telescope Ultraviolet Light Curves Reveal Interesting Properties of CC Sculptoris and RZ Leonis
Paula Szkody, Anjum S. Mukadam, Odette Toloza +6
Time-tag ultraviolet data obtained on the Hubble Space Telescope in 2013 reveal interesting variability related to the white dwarf spin in the two cataclysmic variables RZ Leo and…
Effective Temperatures of Cataclysmic Variable White Dwarfs as a Probe of their Evolution
A. F. Pala, B. T. Gänsicke, D. Townsley +29
We present HST spectroscopy for 45 cataclysmic variables (CVs), observed with HST/COS and HST/STIS. For 36 CVs, the white dwarf is recognisable through its broad Ly absorption p…
Hubble Space Telescope Cosmic Origins Spectrograph Spectroscopy of the Southern Nova-like BB Doradus in an Intermediate State
Patrick Godon, Edward Sion, Boris Gansicke +6
We present a spectral analysis of the Hubble Space Telescope Cosmic Origins Spectrograph spectrum of the southern VY Scl nova-like variable BB Doradus, obtained as part of a Cycle…
Far Ultraviolet Spectroscopy of Old Novae II: RR Pic, V533 Her and DI Lac
Edward Sion, Patrick Godon, Liam Jones
The old novae V533 Her (Nova Her 1963), DI Lac (Nova Lac 1910) and RR Pic (Nova Pic 1891) are in (or near) their quiescent stage following their nova explosions and continue to acc…
GW Librae: A unique laboratory for pulsations in an accreting white dwarf
O. Toloza, B. T. Gaensicke, J. J. Hermes +22
Non-radial pulsations have been identified in a number of accreting white dwarfs in cataclysmic variables. These stars offer insight into the excitation of pulsation modes in atmos…
Probing the Accreting Hot Components in Six S-Type Symbiotic Variables
Edward M. Sion, Patrick Godon, Joanna Mikolajewska +1
We have carried out a spectroscopic analysis of the far ultraviolet spectra of six symbiotic variables. Two systems, LT Del, which has had one recorded outburst, and BD-21 3873 (=…