Search Publications
Revisiting the classics: on the optical colours of novae as standard crayons
Strader, Jay; Chomiuk, Laura; Craig, Peter +9 more
We present a systematic study of the
The total mass of the close, double degenerate (DA+DQ) system NLTT 16249
Vennes, Stéphane; Kawka, Adela
We revisit the binary and stellar properties of the double-degenerate system NLTT 16249. An analysis of new echelle spectra, supported by a joint study of a DQZ velocity template NLTT 44303, confirms the orbital period and constrains the mass ratio revealing a carbon-polluted DQ white dwarf that is up to
Thermal stresses as a possible mechanism for initiating the destruction of comet Shoemaker-Levy 9
Omarov, Chingis; Shestakova, Lyubov I.; Spassyuk, Ruslan
It is now widely accepted that the breakup of comet Shoemaker-Levy 9 (SL9) was caused by tidal forces. This explanation applies to bodies that enter a planet's Roche zone and have a loose 'rubble pile' structure with no internal strength. Observations from the Rosetta mission to comet 67P/Churyumov-Gerasimenko initially supported this hypothesis, …
Accretion onto WD 2226-210, the central star of the Helix Nebula
Chu, Y. -H.; Estrada-Dorado, S.; Guerrero, M. A. +4 more
The central star of the Helix Nebula, WD 2226
Investigating pulsating variables and eclipsing binaries in NGC 2126 using ground- and space-based photometry, astrometry, spectroscopy, and modelling
Panwar, Neelam; Joshi, Santosh; Joshi, Yogesh C. +12 more
Pulsating variables are prevalent in the classical
Accretion disc dynamics in extragalactic black hole X-ray binaries: a comprehensive study of M33 X-7, NGC 300 X-1, and IC 10 X-1
Nandi, Anuj; Bhuvana, G. R.
Extragalactic black hole X-ray binaries (BH-XRBs) are the most intriguing X-ray sources as some of them are 'home' to the most massive stellar-mass BHs ever found. In this work, we conduct a comprehensive study of three massive, eclipsing extragalactic BH-XRBs i.e. M33X-7, NGC300X-1, and IC10X-1 and using entire X-ray observations available from X…
Follow-up on three poorly studied AM CVn stars
Reichart, D. E.; Hermes, J. J.; Dhillon, V. S. +12 more
We report follow-up observations of three poorly studied AM CVn-type binaries: CRTS CSS150211 J091017-200813, NSV 1440, and SDSS J183131.63+420220.2. Analysing time-series photometry obtained with a range of ground-based facilities as well as with the Transiting Exoplanet Survey Satellite (TESS), we determine the superhump period of CRTS J0910-200…
Chemodynamic evolution of Sun-like stars in nearby moving groups
Murphy, Michael T.; Liu, Fan; Flynn, Chris +1 more
Sun-like stars are well represented in the solar neighbourhood but are currently underutilized, with many studies of chemical and kinematic evolution focusing on red giants (which can be observed further away) or turn-off stars (which have well-measured ages). Recent surveys (e.g. GALAH) provide spectra for large numbers of nearby Sun-like stars, …
The NuSTAR view of five changing-look active galactic nuclei
Liu, Hao; Wu, Qingwen; Lyu, Bing +3 more
Changing-look active galactic nuclei (CLAGNs) are known to change their spectral type between 1 and 2 (changing-state) or change their absorption between Compton-thick and Compton-thin (changing-obscuration) on time-scales of years or less. The physical mechanism and possible connection between the two types of CLAGNs are still unclear. We explore…
DW Cnc: a micronova with a negative superhump and a flickering spin
Altamirano, D.; Knigge, C.; de Martino, D. +14 more
Magnetic accreting white dwarfs in cataclysmic variables have been known to show bursts driven by different physical mechanisms; however, the burst occurrence is much rarer than in their non-magnetic counterparts. DW Cnc is a well-studied intermediate polar that showed a burst with a 4-magnitude amplitude in 2007. Here we report on a recent burst …