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New insights into the rotational evolution of near-solar age stars from the open cluster M 67
Gruner, D.; Barnes, S. A.; Weingrill, J.
Context. Gyrochronology allows the derivation of ages for cool main sequence stars from their observed rotation periods and masses, or a suitable proxy of the latter. It is increasingly well explored for FGK stars, but requires further measurements for older ages and K-M-type stars.
Aims: Recent work has shown that the behavior of stellar spi…
Joint analysis of gravitational-wave and electromagnetic data of mergers: breaking an afterglow model degeneracy in GW170817 and in future events
Gianfagna, Giulia; Piro, Luigi; Pannarale, Francesco +4 more
On 2017 August 17, Advanced LIGO and Virgo observed GW170817, the first gravitational-wave (GW) signal from a binary neutron star merger. It was followed by a short-duration gamma-ray burst, GRB 170817A, and by a non-thermal afterglow emission. In this work, a combined simultaneous fit of the electromagnetic (EM, specifically, afterglow) and GW do…
Prospects from TESS and Gaia to Constrain the Flatness of Planetary Systems
Zhu, Wei; Espinoza-Retamal, Juan I.; Petrovich, Cristobal
The mutual inclination between planets orbiting the same star provides key information to understand the formation and evolution of multiplanet systems. In this work, we investigate the potential of Gaia astrometry in detecting and characterizing cold Jupiters in orbits exterior to the currently known Transiting Exoplanet Survey Satellite (TESS) p…
The ESO-VLT MIKiS Survey Reloaded: Exploring the Internal Kinematics of NGC 6440
Vesperini, Enrico; Cadelano, Mario; Pallanca, Cristina +7 more
In the context of the ESO-VLT Multi-Instrument Kinematic Survey of Galactic globular clusters, here we present the line-of-sight velocity dispersion profile of NGC 6440, a massive globular cluster located in the Galactic bulge. By combining the data acquired with four different spectrographs, we obtained the radial velocity of a sample of ~1800 in…
Spectroscopy of CASSOWARY gravitationally lensed galaxies in SDSS: characterization of an extremely bright reionization-era analogue at z = 1.42
Stark, Daniel P.; Ellis, Richard S.; Rigby, Jane R. +3 more
We present new observations of 16 bright (r = 19-21) gravitationally lensed galaxies at z ≃ 1-3 selected from the CASSOWARY survey. Included in our sample is the z = 1.42 galaxy CSWA-141, one of the brightest known reionization-era analogues at high redshift (g = 20.5), with a large specific star formation rate (31.2 Gyr-1) and an [O II…
The formation pathways of compact elliptical galaxies
Forbes, Duncan A.; Drinkwater, Michael J.; Bekki, Kenji +3 more
Compact elliptical (cE) galaxies remain an elusively difficult galaxy class to study. Recent observations have suggested that isolated and host-associated cEs have different formation pathways, while simulation studies have also shown different pathways can lead to a cE galaxy. However, a solid link has not been established, and the relative contr…
A New Galaxy Cluster Merger Capable of Probing Dark Matter: A56
Finner, Kyle; Wittman, David; Stancioli, Rodrigo +3 more
We report the discovery of a binary galaxy cluster merger via a search of the redMaPPer optical cluster catalog, with a projected separation of 535 kpc between the brightest cluster galaxies (BCGs). Archival XMM-Newton spectro-imaging reveals a gas peak between the BCGs, suggesting a recent pericenter passage. We conduct a galaxy redshift survey t…
A ∼15 kpc outflow cone piercing through the halo of the blue compact metal-poor galaxy SBS 0335-052E
Östlin, G.; Hayes, M.; Monreal-Ibero, A. +11 more
Context. Outflows from low-mass star-forming galaxies are a fundamental ingredient for models of galaxy evolution and cosmology. Despite seemingly favourable conditions for outflow formation in compact starbursting galaxies, convincing observational evidence for kiloparsec-scale outflows in such systems is scarce.
Aims: The onset of kiloparse…
Power-2 limb-darkening coefficients for the uvby, UBVRIJHK, SDSS ugriz, Gaia, Kepler, TESS, and CHEOPS photometric systems. II. PHOENIX spherically symmetric stellar atmosphere models
Southworth, J.; Claret, A.
Context. The phenomenon of limb-darkening is relevant to many topics in astrophysics, including the analysis of light curves of eclipsing binaries, optical interferometry, measurement of stellar diameters, line profiles of rotating stars, gravitational microlensing, and transits of extrasolar planets
Aims: Multiple parametric limb-darkening l…
Deep X-Ray and Radio Observations of the First Outburst of the Young Magnetar Swift J1818.0-1607
Campana, S.; Tiengo, A.; Götz, D. +23 more
Swift J1818.0-1607 is a radio-loud magnetar with a spin period of 1.36 s and a dipolar magnetic field strength of B ~ 3 × 1014 G, which is very young compared to the Galactic pulsar population. We report here on the long-term X-ray monitoring campaign of this young magnetar using XMM-Newton, NuSTAR, and Swift from the activation of its …