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An extreme-mass ratio, short-period eclipsing binary consisting of a B dwarf primary and a pre-main-sequence M star companion discovered by KELT
Bieryla, Allyson; Latham, David W.; Berlind, Perry +21 more
We present the discovery of KELT J072709 + 072007 (HD 58730), a very low mass ratio (q ≡ M2/M1 ≈ 0.07) eclipsing binary (EB) identified by the Kilodegree Extremely Little Telescope (KELT) survey. We present the discovery light curve and perform a global analysis of four high-precision ground-based light curves, the Transiting…
Polarimetric and radiative transfer modelling of HD 172555
Scicluna, Peter; Bailey, Jeremy; Cotton, Daniel V. +3 more
The debris disc around HD 172555 was recently imaged in near-infrared polarized scattered light by the Very Large Telescope's Spectro-Polarimetric High-contrast Exoplanet REsearch instrument. Here we present optical aperture polarization measurements of HD 172555 by the HIgh Precision Polarimetric Instrument (HIPPI), and its successor HIPPI-2 on t…
Hard X-ray properties of radio-selected blazars
Gehrels, N.; Wilms, J.; Kadler, M. +6 more
Context. Hard X-ray properties of beamed active galactic nuclei have been published in the 105-month Swift/BAT catalog, but there have not been any studies carried out so far on a well-defined, radio-selected sample of low-peaked blazars in the hard X-ray band.
Aims: Using the statistically complete MOJAVE-1 sample, we aim to determine the ha…
The White Dwarf Binary Pathways Survey -III. Contamination from hierarchical triples containing a white dwarf
Gänsicke, B. T.; Koester, D.; Parsons, S. G. +12 more
The White Dwarf Binary Pathways Survey aims at increasing the number of known detached A, F, G, and K main-sequence stars in close orbits with white dwarf companions (WD+AFGK binaries) to refine our understanding about compact binary evolution and the nature of Supernova Ia progenitors. These close WD+AFGK binary stars are expected to form through…
Gamma-ray signals from multicomponent scalar dark matter decays
Ibarra, Alejandro; Ghosh, Avirup; Mondal, Tanmoy +1 more
Within a multicomponent dark matter scenario, novel gamma-ray signals may arise from the decay of the heavier dark matter component into the lighter. For a scalar dark sector of this kind, the decay phi2→phi1 γ is forbidden by the conservation of angular momentum, but the decay phi2 → phi1 γγ can have a …
Multi-spacecraft Current Estimates at Swarm
Cao, J. -B.; Yang, J. -Y.; Yang, Y. -Y. +2 more
In this chapter the application of the curlometer technique to various regions of the inner magnetosphere and upper ionosphere and for special circumstances of sampling is described. The basic technique is first outlined, together with the caveats of use, covering: the four-spacecraft technique, its quality factor and limitations; the lessons lear…
A Single-chord Stellar Occultation by the Extreme Trans-Neptunian Object (541132) Leleākūhonua
Sicardy, Bruno; Buie, Marc W.; Leiva, Rodrigo +32 more
A stellar occultation by the extreme large-perihelion trans-Neptunian object (541132) Leleākūhonua (also known by the provisional designation of 2015 TG387) was predicted by the Lucky Star project and observed with the Research and Education Collaborative Occultation Network on 2018 October 20 UT. A single detection and a nearby nondete…
Exo-MerCat: A merged exoplanet catalog with Virtual Observatory connection
Claudi, R.; Bignamini, A.; Molinaro, M. +1 more
The heterogeneity of papers dealing with the discovery and characterization of exoplanets makes every attempt to maintain a uniform exoplanet catalog almost impossible. Four sources currently available online (NASA Exoplanet Archive, Exoplanet Orbit Database, Exoplanet Encyclopaedia, and Open Exoplanet Catalogue) are commonly used by the community…
Existence of the Metal-rich Stellar Halo and High-velocity Thick Disk in the Galaxy
Shi, Jianrong; Ma, Jun; Du, Cuihua +3 more
Based on the second Gaia data release (DR2), combined with the LAMOST and APOGEE spectroscopic surveys, we study the kinematics and metallicity distribution of the high-velocity stars that have a relative speed of at least 220 $\mathrm{km}\ {{\rm{s}}}^{-1}$ with respect to the local standard of rest in the Galaxy. The rotational velocity distribut…
Spectral Structures of Type II Solar Radio Bursts and Solar Energetic Particles
Yashiro, Seiji; Nitta, Nariaki V.; Iwai, Kazumasa +1 more
We investigated the relationship between the spectral structures of type II solar radio bursts in the hectometric and kilometric wavelength ranges and solar energetic particles (SEPs). To examine the statistical relationship between type II bursts and SEPs, we selected 26 coronal mass ejection (CME) events with similar characteristics (e.g., initi…