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Mass-loss along the red giant branch in 46 globular clusters and their multiple populations
Milone, A. P.; Cordoni, G.; Marino, A. F. +7 more
The location of Galactic globular clusters' (GC) stars on the horizontal branch (HB) should mainly depend on GC metallicity, the 'first parameter', but it is actually the result of complex interactions between the red giant branch (RGB) mass-loss, the coexistence of multiple stellar populations with different helium content, and the presence of a …
The eye of Gaia on globular clusters structure: tidal tails
Sollima, A.
I analyse the projected density distribution of member stars over a wide area surrounding 18 Galactic globular clusters using the photometric and astrometric information provided by the second data release of the Gaia mission. A 5D mixture modelling technique has been employed to optimally isolate the signal of the cluster stellar population from …
HST Proper Motions of NGC 147 and NGC 185: Orbital Histories and Tests of a Dynamically Coherent Andromeda Satellite Plane
van der Marel, Roeland P.; Geha, Marla; Fardal, Mark A. +4 more
We present the first proper-motion (PM) measurements for the dwarf elliptical galaxies NGC 147 and NGC 185, two satellite galaxies of M31, using multiepoch Hubble Space Telescope (HST) imaging data with time baselines of ∼8 yr. For each galaxy, we take an error-weighted average of measurements from HST Advanced Camera for Surveys/WFC and Wide Fiel…
GW Ori: Interactions between a Triple-star System and Its Circumtriple Disk in Action
Dong, Ruobing; Kataoka, Akimasa; Takami, Michihiro +17 more
GW Ori is a hierarchical triple system with a rare circumtriple disk. We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of 1.3 mm dust continuum and 12CO J = 2 - 1 molecular gas emission of the disk. For the first time, we identify three dust rings in the GW Ori disk at ∼46, 188, and 338 au, with estimated dust…
Spectral Variability of VHS J1256-1257b from 1 to 5 µm
Kataria, Tiffany; Apai, Dániel; Zhou, Yifan +4 more
Multiwavelength time-resolved observations of rotationally modulated variability from brown dwarfs and giant exoplanets are the most effective method for constraining their heterogeneous atmospheric structures. In a companion paper, we reported the discovery of strong near-infrared variability in HST/WFC3/G141 light curves of the very red L-dwarf …
A precise architecture characterization of the π Mensae planetary system
Bouchy, F.; Rebolo, R.; Pallé, E. +97 more
Context. The bright star π Men was chosen as the first target for a radial velocity follow-up to test the performance of ESPRESSO, the new high-resolution spectrograph at the European Southern Observatory's Very Large Telescope. The star hosts a multi-planet system (a transiting 4 M⊕ planet at ~0.07 au and a sub-stellar companion on a ~…
Detection and Characterization of Oscillating Red Giants: First Results from the TESS Satellite
Barclay, Thomas; Chaplin, William J.; Davies, Guy R. +78 more
Since the onset of the "space revolution" of high-precision high-cadence photometry, asteroseismology has been demonstrated as a powerful tool for informing Galactic archeology investigations. The launch of the NASA Transiting Exoplanet Survey Satellite (TESS) mission has enabled seismic-based inferences to go full sky—providing a clear advantage …
MUSE view of Arp220: Kpc-scale multi-phase outflow and evidence for positive feedback
Maiolino, R.; Colina, L.; Perna, M. +9 more
Context. Arp220 is the nearest and prototypical ultra-luminous infrared galaxy; it shows evidence of pc-scale molecular outflows in its nuclear regions and strongly perturbed ionised gas kinematics on kpc scales. It is therefore an ideal system for investigating outflow mechanisms and feedback phenomena in detail.
Aims: We investigate the fee…
Gap, shadows, spirals, and streamers: SPHERE observations of binary-disk interactions in GG Tauri A
Lodato, G.; Pinte, C.; Ménard, F. +31 more
Context. A large portion of stars is found to be part of binary or higher-order multiple systems. The ubiquity of planets found around single stars raises the question of whether and how planets in binary systems form. Protoplanetary disks are the birthplaces of planets, and characterizing them is crucial in order to understand the planet formatio…
The Pristine Inner Galaxy Survey (PIGS) II: Uncovering the most metal-poor populations in the inner Milky Way
Lewis, Geraint F.; Cohen, Roger E.; Simpson, Jeffrey D. +19 more
Metal-poor stars are important tools for tracing the early history of the Milky Way, and for learning about the first generations of stars. Simulations suggest that the oldest metal-poor stars are to be found in the inner Galaxy. Typical bulge surveys, however, lack low metallicity ( $\rm {[Fe/H]} \lt -1.0$ ) stars because the inner Galaxy is pred…