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Properties of Solar Rossby Waves from Normal Mode Coupling and Characterizing Its Systematics
Mandal, Krishnendu; Hanasoge, Shravan
Rossby waves play an important role in mediating the angular momentum of rotating spherical fluids, creating weather on Earth and tuning exoplanet orbits in distant stellar systems. Their recent discovery in the solar convection zone provides an exciting opportunity to appreciate the detailed astrophysics of Rossby waves. Large-scale Rossby waves …
The GTC exoplanet transit spectroscopy survey. XI. Possible detection of Rayleigh scattering in the atmosphere of the Saturn-mass planet WASP-69b
Nortmann, L.; Palle, E.; Nowak, G. +2 more
Context. One of the main atmospheric features in exoplanet atmospheres, detectable both from ground- and space-based facilities, is Rayleigh scattering. In hydrogen-dominated planetary atmospheres, Rayleigh scattering causes the measured planetary radius to increase toward blue wavelengths in the optical range.
Aims: We aim to detect and impr…
Unlocking Galactic Wolf-Rayet stars with Gaia DR2 - II. Cluster and association membership
Parker, Richard J.; Crowther, Paul A.; Rate, Gemma
Galactic Wolf-Rayet (WR) star membership of star-forming regions can be used to constrain the formation environments of massive stars. Here, we utilize Gaia DR2 parallaxes and proper motions to reconsider WR star membership of clusters and associations in the Galactic disc, supplemented by recent near-infrared studies of young massive clusters. We…
The Cluster AgeS Experiment (CASE) - VIII. Age and distance of the Globular Cluster 47 Tuc from the analysis of two detached eclipsing binaries
Soszyński, I.; Udalski, A.; Szymański, M. K. +20 more
We use photometric and spectroscopic observations of the eclipsing binary E32 in the globular cluster 47 Tuc to derive the masses, radii, and luminosities of the component stars. The system has an orbital period of 40.9 d, a markedly eccentric orbit with e = 0.24, and is shown to be a member of or a recent escaper from the cluster. We obtain M_p =…
The first broad-band X-ray view of the narrow-line Seyfert 1 Ton S180
Ebrero, J.; Schartel, N.; Santos-Lleó, M. +15 more
We present joint XMM-Newton and NuSTAR observations of the 'bare' narrow-line Seyfert 1 Ton S180 (z = 0.062), carried out in 2016 and providing the first hard X-ray view of this luminous galaxy. We find that the 0.4-30 keV band cannot be self-consistently reproduced by relativistic reflection models, which fail to account simultaneously for the so…
A DECam view of the diffuse dwarf galaxy Crater II - Variable stars
Nidever, David L.; Olsen, Knut; Walker, Alistair R. +11 more
Time series observations of a single dithered field centred on the diffuse dwarf satellite galaxy Crater II were obtained with the Dark Energy Camera (DECam) at the 4m Blanco Telescope at Cerro Tololo Inter-American Observatory, Chile, uniformly covering up to two half-light radii. Analysis of the g and I time series results in the identification …
Infalling gas in a Lyman-α blob
Kohno, Kotaro; Lehnert, Matthew D.; Menten, Karl M. +11 more
Lyman-α blobs (LABs) are spatially extended nebulae of emission in the Lyman-α (Lyα) line of hydrogen, seen at high redshifts1,2, and most commonly found in the dense environment of star-forming galaxies3,4. A recent study showed that nearly 100% of the sky is covered by Lyα emission around high-redshift galaxies5-7
Orbital and spectral characterization of the benchmark T-type brown dwarf HD 19467B
Henning, T.; Brandner, W.; Ségransan, D. +42 more
Context. Detecting and characterizing substellar companions for which the luminosity, mass, and age can be determined independently is of utter importance to test and calibrate the evolutionary models due to uncertainties in their formation mechanisms. HD 19467 is a bright and nearby star hosting a cool brown dwarf companion detected with radial v…
Physical Characterization of Interstellar Comet 2I/2019 Q4 (Borisov)
Tholen, David J.; Ye, Quan-Zhi; Hui, Man-To +2 more
We present a study of interstellar comet 2I/2019 Q4 (Borisov) using both preperihelion and postperihelion observations spanning late September 2019 through late January 2020. The intrinsic brightness of the comet was observed to continuously decline throughout the timespan, likely due to the decreasing effective scattering cross-section as a resul…
Charge induced acceleration noise in the LISA gravitational reference sensor
Sumner, Timothy J.; Wass, Peter J.; Conklin, John W. +2 more
The presence of free charge on isolated proof-masses, such as those within space-borne gravitational reference sensors, causes a number of spurious forces which will give rise to associated acceleration noise. A complete discusssion of each charge induced force and its linear acceleration noise is presented. The resulting charge acceleration noise…