Search Publications
The cosmic assembly of stellar haloes in massive early-type Galaxies
Pérez-González, Pablo G.; Curtis-Lake, Emma; Trujillo, Ignacio +5 more
Using the exquisite depth of the Hubble Ultra Deep Field (HUDF12 programme) data set, we explore the ongoing assembly of the outermost regions of the most massive galaxies (Mstellar ≥ 5× 1010 M⊙) at z ≤ 1. The outskirts of massive objects, particularly early-type Galaxies (ETGs), are expected to suffer a dramatic t…
CO-driven Activity in Comet C/2017 K2 (PANSTARRS)
Chambers, Kenneth C.; Magnier, Eugene; Bauer, James +12 more
Comet C/2017 K2 (PANSTARRS) was discovered by the Pan-STARRS1 (PS1) Survey on 2017 May 21 at a distance of 16.09 au from the Sun, the second most distant discovery of an active comet. Pre-discovery images in the PS1 archive back to 2014 and additional deep CFHT images between 2013 May 10-13 showed the comet to be active at 23.75 au. We derive an u…
Low mass X-ray binaries in the Inner Galaxy: implications for millisecond pulsars and the GeV excess
Heinke, Craig; Linden, Tim; Haggard, Daryl +1 more
If millisecond pulsars (MSPs) are responsible for the excess gamma-ray emission observed from the region surrounding the Galactic Center, the same region should also contain a large population of low-mass X-ray binaries (LMXBs). In this study, we compile and utilize a sizable catalog of LMXBs observed in the the Milky Way's globular cluster system…
Planck data versus large scale structure: Methods to quantify discordance
Battye, Richard A.; Moss, Adam; Charnock, Tom
Discordance in the Λ cold dark matter cosmological model can be seen by comparing parameters constrained by cosmic microwave background (CMB) measurements to those inferred by probes of large scale structure. Recent improvements in observations, including final data releases from both Planck and SDSS-III BOSS, as well as improved astrophysical unc…
Global Mars-solar wind coupling and ion escape
Barabash, Stas; Nilsson, Hans; Holmström, Mats +2 more
Loss of the early Martian atmosphere is often thought to have occurred due to an effective transfer of the solar wind energy through the Martian induced magnetic barrier to the ionosphere. We have quantified the coupling efficiency by comparing the power of the heavy ion outflow with the available power supplied by the upstream solar wind. Constra…
The 67P/Churyumov-Gerasimenko observation campaign in support of the Rosetta mission
Lasue, J.; Villanueva, G. L.; Lara, L. M. +112 more
We present a summary of the campaign of remote observations that supported the European Space Agency's Rosetta mission. Telescopes across the globe (and in space) followed comet 67P/Churyumov-Gerasimenko from before Rosetta's arrival until nearly the end of the mission in September 2016. These provided essential data for mission planning, large-sc…
Binary Central Stars of Planetary Nebulae Discovered Through Photometric Variability. V. The Central Stars of HaTr 7 and ESO 330-9
Frew, David J.; Reindl, Nicole; Margheim, Steve +3 more
We find the central stars (CSs) of the planetary nebulae (PNe) HaTr 7 and ESO 330-9 to be close-binary systems. Both have orbital periods of less than half a day and contain an irradiated cool companion to the hot CS. We provide light curves, spectra, radial velocity curves, orbital periods, and binary modeling results for both systems. The binary…
Discovery of Extended Main-sequence Turnoffs in Four Young Massive Clusters in the Magellanic Clouds
Milone, Antonino P.; Deng, Licai; de Grijs, Richard +1 more
An increasing number of young massive clusters (YMCs) in the Magellanic Clouds have been found to exhibit bimodal or extended main sequences (MSs) in their color-magnitude diagrams (CMDs). These features are usually interpreted in terms of a coeval stellar population with different stellar rotational rates, where the blue and red MS stars are popu…
Space Weather Effects Produced by the Ring Current Particles
Jaynes, Allison; Ganushkina, Natalia; Liemohn, Michael
One of the definitions of space weather describes it as the time-varying space environment that may be hazardous to technological systems in space and/or on the ground and/or endanger human health or life. The ring current has its contributions to space weather effects, both in terms of particles, ions and electrons, which constitute it, and magne…
Multiplicity and clustering in Taurus star-forming region. I. Unexpected ultra-wide pairs of high-order multiplicity in Taurus
Duchêne, Gaspard; Moraux, Estelle; Joncour, Isabelle
Aims: This work analyses the spatial distribution of stars in Taurus with a specific focus on multiple stars and wide pairs in order to derive new constraints on star formation and early dynamical evolution scenarios.
Methods: We collected the multiplicity data of stars in Taurus to build an up-to-date stellar/multiplicity catalog. We fi…