Search Publications
The structural properties of nearby dwarf galaxies in low-density environments - size, surface brightness, and colour gradients
Kaviraj, S.; Watkins, A. E.; Lazar, I. +3 more
We use a complete sample of 211 nearby (
Chemical abundances and ionizing mechanisms in the star-forming double-ring of AM 0644-741 using MUSE data
Oskinova, L. M.; Sander, A. A. C.; Charlot, S. +6 more
We present the analysis of archival Very Large Telescope Multi-Unit Spectroscopic Explorer observations of 179 H II regions in the star-forming double-ring collisional galaxy AM 0644-741 at 98.6 Mpc. We determined ionic abundances of He, N, O, and Fe using the direct method for the brightest H II region (ID 39); we report $\log \rm {(\frac{N}{O})}…
Long-term evolution of cyclotron line energy in an eclipsing pulsar 4U 1538-522
Tobrej, Mohammed; Rai, Binay; Ghising, Manoj +2 more
We present the timing and spectral analysis of the high-mass X-ray binary source 4U 1538-522 using Nuclear Spectroscopic Telescope Array (NuSTAR) observations. One of the observations partially covers the X-ray eclipse of the source along with eclipse ingress. The source is found to spin down at the rate of 0.163 ± 0.002 s yr-1 between …
A Markedly Expanded Sample of Candidate X-Ray-emitting Isolated Neutron Stars
Anderson, Scott F.; Agüeros, Marcel A.; Demasi, Sebastian
The current sample of 12 radio-quiet isolated neutron stars that emit strongly in X-rays (XINSs) is both small and heterogeneous, limiting its usefulness for understanding the physics of neutron star atmospheres and cooling rates and for constraining the equation of state of neutron degenerate matter. Utilizing the ROSAT 1RXS and 2RXS data sets, i…
First holistic modelling of meteoroid ablation and fragmentation: A case study of the Orionids recorded by the Canadian Automated Meteor Observatory
Vida, Denis; Brown, Peter G.; Campbell-Brown, Margaret +1 more
18 mm-sized Orionid meteoroids were captured in 2019 and 2020 by the Canadian Automated Observatory's mirror tracking system. Meteor position measurements were made to an accuracy of ∼1m and the meteors were tracked to a limiting magnitude of about + 7 . 5 at the faintest point. The trajectory estimation shows the intrinsic physical dispersion of …
TIARA TESS 1: estimating exoplanet yields from Years 1 and 3 SPOC light curves
Bayliss, Daniel; Gill, Samuel; Hawthorn, Faith +1 more
We present a study of the detection efficiency for the TESS mission, focusing on the yield of longer period transiting exoplanets (P > 25 d). We created the Transit Investigation and Recoverability Application (TIARA) pipeline to use real TESS data with injected transits to create sensitivity maps which we combine with occurrence rates derived …
The Infrared Auroral Footprint Tracks of Io, Europa and Ganymede at Jupiter Observed by Juno-JIRAM
Altieri, F.; Sindoni, G.; Piccioni, G. +20 more
The electromagnetic coupling between the Galilean satellites at Jupiter and the planetary ionosphere generates an auroral footprint, which is detected with high spatial resolution in the infrared L band by the Jovian InfraRed Auroral Mapper (JIRAM) onboard the Juno spacecraft. We report the JIRAM data acquired since 27 August 2016 until 23 May 202…
V892 Tau: A tidally perturbed circumbinary disc in a triple stellar system
Ménard, François; Ribas, Álvaro; Macías, Enrique +8 more
Context. V892 Tau is a young binary star surrounded by a circumbinary disc that shows hints of an interaction with the low-mass nearby star V892 Tau NE.
Aims: The goal of this paper is to constrain the orbit of V892 Tau NE and to determine the resulting circumbinary disc dynamics.
Methods: We present new ALMA observations of the V892 Tau…
Acceleration and Release of Solar Energetic Particles Associated with a Coronal Shock on 2021 September 28 Observed by Four Spacecraft
Lugaz, Noé; Zhuang, Bin; Chrysaphi, Nicolina +5 more
The main driver of the acceleration of solar energetic particles (SEPs) is believed to be shocks driven by coronal mass ejections. Extreme-ultraviolet (EUV) waves are thought to be the propagating footprint of the shock on the solar surface. One of the key questions in SEP research is the timing of the SEP release with respect to the time when the…
On the identification of the first two young asteroid families in g-type non-linear secular resonances
Carruba, V.; Aljbaae, S.; Domingos, R. C. +10 more
Linear secular resonances happen when there is a commensurability between the precession frequency of the pericenter, g, or longitude of the node, s, of an asteroid and a planet. Non-linear resonances are higher order combinations of these frequencies. Here, we studied the three most diffusive g-type non-linear secular resonances using Artificial …