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ACCESS: Confirmation of No Potassium in the Atmosphere of WASP-31b
Fortney, Jonathan J.; Kirk, James; López-Morales, Mercedes +12 more
We present a new optical (400-950 nm) transmission spectrum of the hot Jupiter WASP-31b (M = 0.48 MJ; R = 1.54 RJ; P = 3.41 days), obtained by combining four transit observations. These transits were observed with IMACS on the Magellan Baade Telescope at Las Campanas Observatory as part of the ACCESS project. We investigate t…
Is Superorbital Modulation in SMC X-1 Caused by Absorption in a Warped Precessing Accretion Disk?
Maitra, Chandreyee; Paul, Biswajit; Pradhan, Pragati
We present a broadband spectral-timing analysis of SMC X-1 at different intensity states of its superorbital variation using 10 Suzaku and 6 Nuclear Spectroscopic Telescope Array (NuSTAR) observations. The spectrum in all the states can be described by an absorbed power law with a high-energy cutoff and a blackbody component along with an iron emi…
The VANDELS survey: Discovery of massive overdensities of galaxies at z > 2. Location of Lyα-emitting galaxies with respect to environment
Bauer, F. E.; Thomas, R.; Bolzonella, M. +19 more
Context. The advent of deep, multi-wavelength surveys, together with the availability of extensive numerical simulations, now allow us for the systematic search and study of (proto)clusters and their surrounding environment as a function of redshift.
Aims: We aim to define the environment and to identify overdensities in the VANDELS Chandra D…
A Real-time Automatic Validation System for Optical Transients Detected by GWAC
Xu, Y.; Wang, J.; Xin, L. P. +4 more
The ground-based wide-angle camera array generates millions of single frame alerts per night. After the complicated and elaborate filters by multiple methods, a couple of dozens of candidates are still needed to be confirmed by follow-up observations in real-time. In order to free scientists from the complex and high-intensity follow-up tasks, we …
High-resolution, 3D radiative transfer modelling. V. A detailed model of the M 51 interacting pair
Clark, Christopher J. R.; Mosenkov, Aleksandr V.; De Looze, Ilse +13 more
Context. Investigating the dust heating mechanisms in galaxies provides a deeper understanding of how the internal energy balance drives their evolution. Over the last decade radiative transfer simulations based on the Monte Carlo method have emphasised the role of the various stellar populations heating the diffuse dust. Beyond the expected heati…
The Flare-dominated Accretion Mode of a Radio-bright Candidate Transitional Millisecond Pulsar
Strader, Jay; Chomiuk, Laura; Heinke, Craig O. +2 more
We report new simultaneous X-ray and radio continuum observations of 3FGL J0427.9-6704, a candidate member of the enigmatic class of transitional millisecond pulsars. These XMM-Newton and Australia Telescope Compact Array observations of this nearly edge-on, eclipsing low-mass X-ray binary were taken in the sub-luminous disk state at an X-ray lumi…
Clusterix 2.0: a virtual observatory tool to estimate cluster membership probability
Jordi, C.; Balaguer-Núñez, L.; Masana, E. +6 more
Clusterix 2.0 is a web-based, Virtual Observatory compliant, interactive tool for the determination of membership probabilities in stellar clusters based on proper-motion data using a fully non-parametric method. In an area occupied by a cluster, the frequency function is made up of two contributions: cluster and field stars. The tool performs an …
New insight into the origin of the GeV flare in the binary system PSR B1259-63/LS 2883 from the 2017 periastron passage
van Soelen, B.; Murphy, D.; Chernyakova, M. +4 more
PSR B1259-63 is a gamma-ray binary system hosting a radio pulsar orbiting around an O9.5Ve star, LS 2883, with a period of ∼3.4 yr. The interaction of the pulsar wind with the LS 2883 outflow leads to unpulsed broad-band emission in the radio, X-rays, GeV, and TeV domains. While the radio, X-ray, and TeV light curves show rather similar behaviour,…
In the Trenches of the Solar-Stellar Connection. I. Ultraviolet and X-Ray Flux-Flux Correlations across the Activity Cycles of the Sun and Alpha Centauri AB
Ayres, Thomas R.
This study focuses on high-energy proxies of stellar magnetic activity over long-term starspot cycles of three low-activity Sun-like stars: α Centauri A (HD 128620: G2 V), α Cen B (HD 128621: K1 V), and the Sun itself. Data sets include: daily solar ultraviolet irradiance spectra and X-ray fluxes from the Solar Radiation and Climate Experiment, du…
Evolution of High-Speed Jets and Plasmoids Downstream of the Quasi-Perpendicular Bow Shock
Gunell, H.; Hamrin, M.; Goncharov, O. +1 more
Plasma structures with enhanced dynamic pressure, density, or speed are often observed in Earth's magnetosheath. We present a statistical study of these structures, known as jets and fast plasmoids, in the magnetosheath, downstream of both the quasi-perpendicular and quasi-parallel bow shocks. Using measurements from the four Magnetospheric Multis…