Search Publications
Missions
Journals
Publication Years
The transitional millisecond pulsar IGR J18245-2452 during its 2013 outburst at X-rays and soft gamma-rays
Stella, L.; Ferrigno, C.; Bozzo, E. +4 more
IGR J18245-2452/PSR J1824-2452I is one of the rare transitional accreting millisecond X-ray pulsars, showing direct evidence of switches between states of rotation-powered radio pulsations and accretion-powered X-ray pulsations, dubbed transitional pulsars. IGR J18245-2452 with a spin frequency of 254.3 Hz is the only transitional pulsar so far to…
X-ray bounds on the r-mode amplitude in millisecond pulsars
Güver, Tolga; Vurgun, Eda; Schwenzer, Kai +1 more
r-mode asteroseismology provides a unique way to study the internal composition of compact stars. Due to their precise timing, recycled millisecond radio pulsars present a particularly promising class of sources. Although their thermal properties are still poorly constrained, X-ray data is very useful for asteroseismology since r-modes could stron…
The massive multiple system HD 64315
Montes, D.; Simón-Díaz, S.; Evans, C. J. +4 more
Context. The O6 Vn star HD 64315 is believed to belong to the star-forming region known as NGC 2467, but previous distance estimates do not support this association. Moreover, it has been identified as a spectroscopic binary, but existing data support contradictory values for its orbital period.
Aims: We explore the multiple nature of this st…
Test of Weak Equivalence Principle with the Multi-band Timing of the Crab Pulsar
Zhang, Yueyang; Gong, Biping
The Weak Equivalent Principle (WEP) can be tested through the parameterized post-Newtonian parameter γ, representing the space curvature produced by unit rest mass. The parameter γ in turn has been constrained by comparing the arrival times of photons originating in distant transient events, such as gamma-ray bursts, fast radio bursts, and giant p…
Evolution of Molecular Clouds in the Superwind Galaxy NGC 1808 Probed by ALMA Observations
Salak, Dragan; Tomiyasu, Yuto; Nakai, Naomasa +3 more
ALMA imaging of the cold molecular medium in the nearby starburst galaxy NGC 1808 is presented. The observations reveal the distribution of molecular gas, traced by 12CO (1-0) and 12CO (3-2), and continuum (93 and 350 GHz) across the central 1 kpc starburst region at a high resolution of ∼ 1\prime\prime . A molecul…
π Aquarii is another γ Cassiopeiae object
Nazé, Yaël; Rauw, Gregor; Cazorla, Constantin
The γ Cas category is a subgroup of Be stars displaying a strong, hard, and variable thermal X-ray emission. An XMM-Newton observation of π Aqr reveals spectral and temporal characteristics that clearly make this Be star another member of the γ Cas category. Furthermore, π Aqr is a binary but, contrary to γ Cas, the nature of the companion to the …
The science planning process on the Rosetta mission
Altobelli, Nicolas; Choukroun, Mathieu; Vallat, Claire +9 more
The Rosetta mission arrived at comet 67 P/Churyumov-Gerasimenko in Summer 2014, after more than 10 years in space. All previous mission encounters with a comet have provided a snapshot of the cometary activity at a given heliocentric distance. In contrast, Rosetta has escorted the comet nucleus for an extended period (>2 years) at a large range…
Spectroscopic and photometric oscillatory envelope variability during the S Doradus outburst of the luminous blue variable R71
Stahl, O.; Asmus, D.; Bartlett, E. S. +7 more
Context. Luminous blue variables (LBVs) are evolved massive stars that exhibit instabilities that are not yet understood. Stars can lose several solar masses during this evolutionary phase. The LBV phenomenon is thus critical to our understanding of the evolution of the most massive stars.
Aims: The LBV R71 in the Large Magellanic Cloud is pr…
Predictions for the detection of tidal streams with Gaia using great-circle methods
Wang, Wenting; Cole, Shaun; Aguilar, Luis +5 more
The Gaia astrometric mission may offer an unprecedented opportunity to discover new tidal streams in the Galactic halo. To test this, we apply nGC3, a great-circle-cell count method that combines position and proper motion data to identify streams, to 10 mock Gaia catalogues of K giants and RR Lyrae stars constructed from cosmological simulations …
Discontinuous drainage systems formed by highland precipitation and ground-water outflow in the Navua Valles and southwest Hadriacus Mons regions, Mars
Hargitai, H. I.; Gulick, V. C.; Glines, N. H.
The Navua Valles are systems of paleodrainages located north of Dao Vallis, which empty into Hellas Planitia, the largest impact basin on Mars. In this study, we mapped and characterized the Navua Valles Region's individual drainage systems, including drainages along the southwestern flank of Hadriacus Mons, and one valley network from the same so…