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Nonparametric reconstruction of interaction in the cosmic dark sector
Mukherjee, Purba; Banerjee, Narayan
The possibility of a nongravitational interaction between dark matter and dark energy is reconstructed using some recent data sets. The crucial aspect is that the interaction is not parametrized at the outset, but rather reconstructed directly from the data in a nonparametric way. The cosmic chronometer Hubble data, the Pantheon supernova compilat…
Re-observing the NLS1 galaxy RE J1034+396 - II. New insights on the soft X-ray excess, QPO, and the analogy with GRS 1915+105
Done, Chris; Ward, Martin; Jin, Chichuan
The active galactic nucleus (AGN) RE J1034+396 displays the most significant X-ray quasi-periodic oscillation (QPO) detected so far. We perform a detailed spectral-timing analysis of our recent simultaneous XMM-Newton, NuSTAR, and Swift observations. We present the energy dependence of the QPO's frequency, rms, coherence, and phase lag, and model …
Thermal and Turbulent Properties of the Warm Neutral Medium in the Solar Neighborhood
Miville-Deschênes, Marc-Antoine; Marchal, Antoine
The transition from the diffuse warm neutral medium (WNM) to the dense cold neutral medium (CNM) is what set the initial conditions to the formation of molecular clouds. The properties of the turbulent cascade in the WNM, essential to describe this radiative condensation process, have remained elusive in part due to the difficulty in mapping out t…
Cepheids with Giant Companions. I. Revealing a Numerous Population of Double-lined Binary Cepheids
Anderson, Richard I.; Gieren, Wolfgang; Pietrzyński, Grzegorz +5 more
Masses of classical Cepheids of 3-11 M⊙ are predicted by theory but those measured clump between 3.6-5 M⊙. As a result, their mass-luminosity relation is poorly constrained, impeding our understanding of basic stellar physics and the Leavitt Law. All Cepheid masses come from the analysis of 11 binary systems, including only f…
Determining the true mass of radial-velocity exoplanets with Gaia. Nine planet candidates in the brown dwarf or stellar regime and 27 confirmed planets
Lecavelier des Etangs, A.; Vidal-Madjar, A.; Kiefer, F. +3 more
Mass is one of the most important parameters for determining the true nature of an astronomical object. Yet, many published exoplanets lack a measurement of their true mass, in particular those detected as a result of radial-velocity (RV) variations of their host star. For those examples, only the minimum mass, or m sin i, is known, owing to the i…
The Carnegie Chicago Hubble Program X: Tip of the Red Giant Branch Distances to NGC 5643 and NGC 1404
Madore, Barry F.; Freedman, Wendy L.; Beaton, Rachael L. +7 more
The primary goal of the Carnegie Chicago Hubble Program (CCHP) is to calibrate the zero-point of the Type Ia supernova (SN Ia) Hubble Diagram through the use of Population II standard candles. So far, the CCHP has measured direct distances to 11 SNe Ia, and here we increase that number to 15 with two new Tip of the Red Giant Branch (TRGB) distance…
A highly non-Keplerian protoplanetary disc. Spiral structure in the gas disc of CQ Tau
Lodato, G.; Testi, L.; Facchini, S. +9 more
Context. In recent years high-angular-resolution observations have revealed that circumstellar discs appear in a variety of shapes with diverse substructures being ubiquitous. This has given rise to the question of whether these substructures are triggered by planet-disc interactions. Besides direct imaging, one of the most promising methods to di…
Supernova bounds on axionlike particles coupled with nucleons and electrons
Calore, Francesca; Carenza, Pierluca; Giannotti, Maurizio +3 more
We investigate the potential of type II supernovae (SNe) to constrain axionlike particles (ALPs) coupled simultaneously to nucleons and electrons. ALPs coupled to nucleons can be efficiently produced in the SN core via nucleon-nucleon bremsstrahlung and, for a wide range of parameters, leave the SN unhindered, producing a large ALP flux. For masse…
Revisiting the Cygnus OB associations
Quintana, Alexis L.; Wright, Nicholas J.
OB associations play an important role in Galactic evolution, though their origins and dynamics remain poorly studied, with only a small number of systems analysed in detail. In this paper, we revisit the existence and membership of the Cygnus OB associations. We find that of the historical OB associations only Cyg OB2 and OB3 stand out as real gr…
On the compressive nature of turbulence driven by ionizing feedback in the pillars of the Carina Nebula
Federrath, Christoph; Reiter, Megan; Klaassen, Pamela +2 more
The ionizing radiation of massive stars sculpts the surrounding neutral gas into pillar-like structures. Direct signatures of star formation through outflows and jets are observed in these structures, typically at their tips. Recent numerical simulations have suggested that this star formation could potentially be triggered by photoionizing radiat…