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Self-consistent nanoflare heating in model active regions: MHD avalanches
Hood, A. W.; Threlfall, J.; Reid, J.
Straightened cylindrical models of coronal loops have been standard for decades, and shown to support nanoflare-like heating, but the influence of geometric curvature in models upon the heating produced has not been discussed in depth. Heating, its spatiotemporal distributions, and the associated mechanisms responsible are discussed, and compared …
A study of the rapid rotator ζ Aql: differential surface rotation?
Bailey, Jeremy; Cotton, Daniel V.; Howarth, Ian D. +1 more
We report new, extremely precise photopolarimetry of the rapidly-rotating A0 main-sequence star ζ Aql, covering the wavelength range ~400-900 nm, which reveals a rotationally-induced signal. We model the polarimetry, together with the flux distribution and line profiles, in the framework of Roche geometry with ω-model gravity darkening, to establi…
The GAPS programme at TNG. XLIV. Projected rotational velocities of 273 exoplanet-host stars observed with HARPS-N
Scandariato, G.; Poretti, E.; Rainer, M. +25 more
Context. The leading spectrographs used for exoplanets' search and characterization offer online data reduction softwares (DRS) that yield, as an ancillary result, the full-width at half-maximum (FWHM) of the cross-correlation function (CCF) that is used to estimate the radial velocity of the host star. The FWHM also contains information on the st…
The first massive compact companion in a wide orbit around a hot subdwarf star
Geier, S.; Heber, U.; Marsh, T. R. +5 more
We report the discovery of the first hot subdwarf B (sdB) star with a massive compact companion in a wide (P = 892.5 ± 60.2 d) binary system. It was discovered based on an astrometric binary solution provided by the Gaia mission Data Release 3. We performed detailed analyses of the spectral energy distribution (SED) as well as spectroscopic follow…
Discovery of inverse-Compton X-ray emission and estimate of the volume-averaged magnetic field in a galaxy group
Simionescu, A.; Mernier, F.; Shimwell, T. W. +6 more
Observed in a significant fraction of clusters and groups of galaxies, diffuse radio synchrotron emission reveals the presence of relativistic electrons and magnetic fields permeating large scale systems of galaxies. Although, these non-thermal electrons are expected to upscatter cosmic microwave background photons up to hard X-ray energies, such …
The role of magnetic fields in the formation of the filamentary infrared dark cloud G11.11-0.12
Chen, Zhiwei; Su, Yang; Zhang, Shaobo +4 more
We report on the near-infrared polarimetric observations of G11.11-0.12 (hereafter G11) obtained with SIRPOL on the 1.4 m IRSF telescope. The starlight polarisation of the background stars reveals the on-sky component of magnetic fields in G11, and these are consistent with the field orientation observed from polarised dust emission at $850\, \mu$…
VaTEST. II. Statistical Validation of 11 TESS-detected Exoplanets Orbiting K-type Stars
Triaud, Amaury H. M. J.; Bieryla, Allyson; Littlefield, Colin +48 more
NASA's Transiting Exoplanet Survey Satellite (TESS) is an all-sky survey mission designed to find transiting exoplanets orbiting nearby bright stars. It has identified more than 329 transiting exoplanets, and almost 6000 candidates remain unvalidated. In this manuscript, we discuss the findings from the ongoing Validation of Transiting Exoplanets …
Prevalence of non-stationarity in quasi-periodic pulsations (QPPs) associated with M- and X-class solar flares
Hayes, L. A.; Broomhall, A. -M.; Mehta, T.
Quasi-periodic pulsations (QPPs) are frequently observed in solar and stellar flare emission, with recent studies suggesting that an increasing instantaneous period is a common characteristic of QPPs. Determining the prevalence of non-stationarity in QPPs contributes to a better understanding of which mechanism(s) is (are) responsible in QPP gener…
The Baryonic Content of Galaxies Mapped by MaNGA and the Gas Around Them
Bershady, Matthew A.; Wake, David A.; Lundgren, Britt +4 more
We analyze the cool gas in and around 14 nearby galaxies (at z < 0.1) mapped with the Sloan Digital Sky Survey IV MaNGA survey by measuring absorption lines produced by gas in spectra of background quasars/active galactic nuclei at impact parameters of 0-25 effective radii from the galactic centers. Using Hubble Space Telescope/Cosmic Origins S…
Constraining the Binarity of Black Hole Candidates: A Proof-of-concept Study of Gaia BH1 and Gaia BH2
Trani, Alessandro A.; Suto, Yasushi; Hayashi, Toshinori
Nearly a hundred binary black holes (BBHs) have been discovered with gravitational-wave signals emitted at their merging events. Thus, it is quite natural to expect that significantly more abundant BBHs with wider separations remain undetected in the Universe or even in our Galaxy. We consider a possibility that star-BH binary candidates may indee…