Search Publications
Missions
Journals
Publication Years
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…
A Hot Saturn Near (but Unassociated with) the Open Cluster NGC 1817
Vanderburg, Andrew; Rampalli, Rayna; Bieryla, Allyson +14 more
We report on the discovery of a hot Saturn-sized planet (9.916 ± 0.985 R ⊕) around a late F-star, K2-308, observed in Campaign 13 of the K2 mission. We began studying this planet candidate because prior to the release of Gaia DR2, the host star was thought to have been a member (≥slant 90 % membership probability) of the ≈ 1 {Gyr} open …
The BepiColombo Laser Altimeter (BELA): a post-launch summary
Thomas, Nicolas; Hussmann, Hauke; Lara, Luisa M.
We provide a brief description of the BepiColombo Laser Altimeter experiment for the joint ESA-JAXA mission to Mercury, BepiColombo. The text describes the main elements of the instrument and discusses several of the problems encountered during the instrument development. The actions taken to mitigate the issues are also described and the resultin…
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 layering-related linear features on comet 67P/Churyumov-Gerasimenko
Penasa, Luca; Boehnhardt, Hermann; Remetean, Emile +4 more
We analysed layering-related linear features on the surface of comet 67P/Churyumov-Gerasimenko (67P) to determine the internal configuration of the layerings within the nucleus. We used high-resolution images from the OSIRIS Narrow Angle Camera onboard the Rosetta spacecraft, projected on to the SHAP7 shape model of the nucleus, to map 171 layerin…
On the ultra-compact nature of the neutron star system 1RXS J170854.4-321857: insights from X-ray spectroscopy
Armas Padilla, M.; López-Navas, E.
The relatively small family of ultra-compact X-ray binary systems is of great interest for many areas of astrophysics. We report on a detailed X-ray spectral study of the persistent neutron star low-mass X-ray binary 1RXS J170854.4-321857. We analysed two XMM-Newton observations obtained in late 2004 and early 2005 when, in agreement with previous…
Searching for correlations in Gaia DR2 unbound star trajectories
García-Bellido, J.; Barrado, D.; Montanari, F.
Scattering events with compact objects are expected in the primordial black hole (PBH) cold dark matter (CDM) scenario, due to close encounters between stars and PBHs in the dense environments of dwarf spheroidals. We develop a Bayesian framework to search for correlations among Milky Way stellar trajectories and those of globular clusters and dwa…
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…
How non-stationary are moderately supercritical shocks?
Gedalin, Michael
Ion motion in a collisionless shock front is affected by macroscopic large-scale weakly varying and microscopic small-scale fast varying magnetic and electric fields. With the increase of the Mach number the role of the microscopic field is expected to become progressively more important. Using a combination of hybrid simulations and test particle…
A GALEX Far-ultraviolet Study of Dwarf Stars in Moving Groups
Smith, Graeme H.; Cochrane, Kevin M.
Far-ultraviolet (FUV) GALEX photometry of main-sequence stars in moving groups is used to verify that there is a relationship between age and FUV broadband magnitude among such stars. Samples of dwarf stars were compiled for twelve moving groups and a search made for both GALEX FUV magnitudes on the AB system and Johnson BV photometry. These data …