Search Publications
Thermal X-ray emission identified from the millisecond pulsar PSR J1909-3744
Guillemot, L.; Webb, N. A.; Barret, D. +5 more
Context. Pulsating thermal X-ray emission from millisecond pulsars can be used to obtain constraints on the neutron star equation of state, but to date only five such sources have been identified. Of these five millisecond pulsars, only two have well-constrained neutron star masses, which improve the determination of the radius via modelling of th…
J-PLUS: Discovery and characterisation of ultracool dwarfs using Virtual Observatory tools
Hernández-Monteagudo, C.; Caballero, J. A.; Martín, E. L. +23 more
Context. Ultracool dwarfs are objects with spectral types equal to or later than M7. Most of them have been discovered using wide-field imaging surveys. The Virtual Observatory has proven to be very useful for efficiently exploiting these astronomical resources.
Aims: We aim to validate a Virtual Observatory methodology designed to discover a…
Analysis of the origin of water, carbon monoxide, and carbon dioxide in the Uranus atmosphere
Lampón, M.; Lara, L. M.; Rodrigo, R. +1 more
Context. We present here an analysis of the potential sources of oxygen species in the Uranus atmosphere.
Aims: Our aim is to explain the current measurements of H2O, CO, and CO2 in the Uranus atmosphere, which would allow us to constrain the influx of oxygen-bearing species and its origin in this planet.
Methods: W…
Generation of photoclinometric DTMs for application to transient changes on the surface of comet 67P/Churyumov-Gerasimenko
Vincent, J. -B.; Hayes, A. G.; Tang, Y. +4 more
Context. The wide spatial and temporal coverage of 67P/Churyumov-Gerasimenko (67P) by the Rosetta mission has revealed a surface created by scattered large-scale changes and numerous small-scale changes. The many small-scale changes are of particular interest because they are unexpected and ubiquitous. As their topographic relief is often smaller …
Chemical composition of the outer halo globular cluster Palomar 15
Rich, R. Michael; Xu, Siyi; Koch, Andreas
Globular clusters (GCs) in the outer Milky Way halo are important tracers of the assembly history of our Galaxy. Only a few of these objects show spreads in heavier elements beyond the canonical light-element variations that have essentially been found throughout the entire Galactic GC system, suggesting a more complex origin and evolution of thes…
The HST Key Project galaxies NGC 1326A, NGC 1425, and NGC 4548: New variable stars and massive star population
Hatzidimitriou, D.; Bonanos, A. Z.; Yang, M. +2 more
Studies of the massive star population in galaxies beyond the Local Group are the key to understanding the link between their numbers and modes of star formation in different environments. We present the analysis of the massive star population of the galaxies NGC 1326A, NGC 1425, and NGC 4548 using archival images obtained with the Hubble Space Te…
Spectral imaging of the thermal Sunyaev-Zel'dovich effect in X-COP galaxy clusters: method and validation
Baldi, A. S.; Bourdin, H.; Mazzotta, P. +4 more
The imaging of galaxy clusters through the Sunyaev-Zel'dovich effect is a valuable tool to probe the thermal pressure of the intra-cluster gas, especially in the outermost regions where X-ray observations suffer from photon statistics. For the first time, we produce maps of the Comptonization parameter by applying a locally parametric algorithm fo…
Quantitative analysis of isolated boulder fields on comet 67P/Churyumov-Gerasimenko
Lamy, P. L.; Lara, L. M.; Bertaux, J. -L. +37 more
Aims: We provide a detailed quantitative analysis of isolated boulder fields situated in three different regions of comet 67P/Churyumov-Gerasimenko: Imhotep, Hapi, and Hatmehit. This is done to supply a useful method for analyzing the morphology of the boulders and to characterize the regions themselves.
Methods: We used OSIRIS Narrow An…
Quest for the tertiary component in Cyg OB2 #5
Nazé, Yaël; Rauw, Gregor; Campos, Fran
Aims: The Cyg OB2 #5 system is thought to consist of a short-period (6.6 d) eclipsing massive binary orbited by an OB-star with a period of 6.7 yr; these stars in turn are orbited by a distant early B-star with a period of thousands of years. However, while the inner binary has been studied many times, information is missing on the other star…
Spitzer Space Telescope observations of bilobate comet 8P/Tuttle
Jorda, L.; Lamy, P. L.; Groussin, O. +4 more
Context. Comet 8P/Tuttle is a nearly isotropic comet whose physical properties are poorly known and might be different from those of ecliptic comets owing to their different origin. Two independent observations have shown that 8P/Tuttle has a bilobate nucleus.
Aims: Our goal is to determine the physical properties of the nucleus (size, shape,…