Search Publications
Braking indices of young radio pulsars: theoretical perspective
Igoshev, Andrei P.; Popov, Sergei B.
Recently, Parthsarathy et al. analysed long-term timing observations of 85 young radio pulsars. They found that 15 objects have absolute values of braking indices ranging ∼10-3000, far from the classical value n = 3. They also noted a mild correlation between measured value of n and characteristic age of a radio pulsar. In this article, we systema…
From birth associations to field stars: mapping the small-scale orbit distribution in the Galactic disc
Xiang, Maosheng; Rix, Hans-Walter; El-Badry, Kareem +3 more
Stars born at the same time in the same place should have formed from gas of the same element composition. But most stars subsequently disperse from their birth siblings, in orbit and orbital phase, becoming 'field stars'. Here, we explore and provide direct observational evidence for this process in the Milky Way disc, by quantifying the probabil…
The Influence of Varying Spacecraft Potentials and Debye Lengths on In Situ Low-Energy Ion Measurements
Stenberg Wieser, Gabriella; Wieser, Martin; Eriksson, Anders +2 more
Low-energy ions are difficult to measure, mainly due to spacecraft charging. The ions are attracted to or repelled from the charged surface prior to detection, which changes both the energy and travel direction of the ions. This results in distortions of the data, and the changed travel directions distort the effective field of view (FOV) of the i…
Characteristics of solar wind suprathermal halo electrons
Fichtner, H.; Pierrard, V.; Lazar, M. +1 more
A suprathermal halo population of electrons is ubiquitous in space plasmas, as evidence of their departure from thermal equilibrium even in the absence of anisotropies. The origin, properties, and implications of this population, however, are poorly known. We provide a comprehensive description of solar wind halo electrons in the ecliptic, contras…
SCExAO/CHARIS Near-infrared Integral Field Spectroscopy of the HD 15115 Debris Disk
Henning, Thomas; Currie, Thayne; Schneider, Glenn +23 more
We present new, near-infrared (1.1-2.4 µm) high-contrast imaging of the debris disk around HD 15115 with the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system coupled with the Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS). The SCExAO/CHARIS resolves the disk down to ρ ∼ 0"2 (rproj ∼ 10 au), a facto…
Hubble Space Telescope Imaging of Antlia B: Star Formation History and a New Tip of the Red Giant Branch Distance
Carlin, J. L.; Dolphin, A. E.; Crnojević, D. +8 more
A census of the satellite population around dwarf galaxy primary hosts in environments outside the Local Group is essential to understanding Λ cold dark matter galaxy formation and evolution on the smallest scales. We present deep optical Hubble Space Telescope imaging of the gas-rich, faint dwarf galaxy Antlia B (M V = -9.4)—a likely…
Coronal Mini-jets in an Activated Solar Tornado-like Prominence
Zhang, Jun; De Pontieu, Bart; Kliem, Bernhard +3 more
High-resolution observations from the Interface Region Imaging Spectrometer reveal the existence of a particular type of small solar jet, which arose singly or in clusters from a tornado-like prominence suspended in the corona. In this study, we perform a detailed statistical analysis of 43 selected mini-jets in the tornado event. Our results show…
The large trans-Neptunian object 2002 TC302 from combined stellar occultation, photometry, and astrometry data
Colas, F.; Mottola, S.; Gutiérrez, P. J. +78 more
Context. Deriving physical properties of trans-Neptunian objects is important for the understanding of our Solar System. This requires observational efforts and the development of techniques suitable for these studies.
Aims: Our aim is to characterize the large trans-Neptunian object (TNO) 2002 TC302.
Methods: Stellar occultat…
High-resolution spectroscopic study of massive blue and red supergiants in Perseus OB1. I. Definition of the sample, membership, and kinematics
Lennon, D. J.; Herrero, A.; Urbaneja, M. A. +5 more
Context. The Perseus OB1 association, including the h and χ Persei double cluster, is an interesting laboratory for the investigation of massive star evolution as it hosts one of the most populous groupings of blue and red supergiants (Sgs) in the Galaxy at a moderate distance and extinction.
Aims: We discuss whether the massive O-type, and b…
Differences and similarities of stellar populations in LAEs and LBGs at z ∼ 3.4-6.8
Boquien, M.; Hernán-Caballero, A.; Arrabal Haro, P. +6 more
Lyman alpha emitters (LAEs) and Lyman break galaxies (LBGs) represent the most common groups of star-forming galaxies at high z, and the differences between their inherent stellar populations (SPs) are a key factor in understanding early galaxy formation and evolution. We have run a set of SP burst-like models for a sample of 1558 sources at 3.4 &…