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Metal-poor nuclear star clusters in two dwarf galaxies near Centaurus A suggesting formation from the in-spiraling of globular clusters
Fahrion, Katja; Müller, Oliver; Jerjen, Helmut +7 more
Studies of nucleated dwarf galaxies can constrain the scenarios for the formation and evolution of nuclear star clusters (NSC) in low-mass galaxies and give us insights on the origin of ultra compact dwarf galaxies (UCDs). We report the discovery of a NSC in the dwarf galaxy KKs58 and investigate its properties together with those of another NSC i…
Weak lensing reveals a tight connection between dark matter halo mass and the distribution of stellar mass in massive galaxies
Sifón, Cristóbal; Leauthaud, Alexie; Behroozi, Peter +9 more
Using deep images from the Hyper Suprime-Cam (HSC) survey and taking advantage of its unprecedented weak lensing capabilities, we reveal a remarkably tight connection between the stellar mass distribution of massive central galaxies and their host dark matter halo mass. Massive galaxies with more extended stellar mass distributions tend to live in…
The Young Suns Exoplanet Survey: Detection of a wide-orbit planetary-mass companion to a solar-type Sco-Cen member
Todorov, K. O.; Ginski, C.; Manara, C. F. +9 more
The Young Suns Exoplanet Survey consists of a homogeneous sample of 70 young, solar-mass stars located in the Lower Centaurus-Crux subgroup of the Scorpius-Centaurus association with an average age of 15 ± 3 Myr. We report the detection of a co-moving companion around the K3IV star TYC 8998-760-1 (2MASSJ13251211-6456207) that is located at a dista…
On testing CDM and geometry-driven Milky Way rotation curve models with Gaia DR2
Lattanzi, Mario G.; Crosta, Mariateresa; Giammaria, Marco +1 more
Flat rotation curves (RCs) in disc galaxies provide the main observational support to the hypothesis of surrounding dark matter (DM). Despite of the difficulty in identifying the DM contribution to the total mass density in our Galaxy, stellar kinematics, as tracer of gravitational potential, is the most reliable observable for gauging different m…
Luminosity Models and Density Profiles for Nuclear Star Clusters for a Nearby Volume-limited Sample of 29 Galaxies
Pechetti, Renuka; Neumayer, Nadine; Kacharov, Nikolay +3 more
Nuclear star clusters (NSCs) are dense stellar clusters that are found at the centers of a majority of galaxies. In this paper, we study the density profiles for 29 galaxies in a volume-limited survey within 10 Mpc to characterize their NSCs. These galaxies span a 3 × 108-8 × 1010 M⊙ and a wide range of Hubble type…
First Gaia dynamical model of the Milky Way disc with six phase space coordinates: a test for galaxy dynamics
Neumayer, Nadine; Cappellari, Michele; Nitschai, Maria Selina
We construct the first comprehensive dynamical model for the high-quality subset of stellar kinematics of the Milky Way disc, with full 6D phase-space coordinates, provided by the Gaia Data Release 2. We adopt an axisymmetric approximation and use an updated Jeans Anisotropic Modelling (JAM) method, which allows for a generic shape and radial orie…
The First Habitable-zone Earth-sized Planet from TESS. II. Spitzer Confirms TOI-700 d
Barclay, Thomas; Vanderburg, Andrew; Latham, David W. +43 more
We present Spitzer 4.5 µm observations of the transit of TOI-700 d, a habitable-zone Earth-sized planet in a multiplanet system transiting a nearby M-dwarf star (TIC 150428135, 2MASS J06282325-6534456). TOI-700 d has a radius of ${1.144}_{-0.061}^{+0.062}{R}_{\oplus }$ and orbits within its host star's conservative habitable zone with a peri…
The Dynamics of Interstellar Asteroids and Comets within the Galaxy: An Assessment of Local Candidate Source Regions for 1I/'Oumuamua and 2I/Borisov
Hallatt, Tim; Wiegert, Paul
The low velocity of interstellar asteroid 1I/'Oumuamua with respect to our galaxy's local standard of rest implies that it is young. Adopting the young age hypothesis, we assess possible origin systems for this interstellar asteroid and for 2I/Borisov, though the latter's higher speed means it is unlikely to be young. First, their past trajectorie…
Corona-Australis DANCe. I. Revisiting the census of stars with Gaia-DR2 data
Miret-Roig, N.; Bouy, H.; Sarro, L. M. +5 more
Context. Corona-Australis is one of the nearest regions to the Sun with recent and ongoing star formation, but the current picture of its stellar (and substellar) content is not complete yet.
Aims: We take advantage of the second data release of the Gaia space mission to revisit the stellar census and search for additional members of the youn…
NGTS clusters survey - I. Rotation in the young benchmark open cluster Blanco 1
Jackman, James A. G.; Wheatley, Peter J.; Foreman-Mackey, Daniel +18 more
We determine rotation periods for 127 stars in the ∼115-Myr-old Blanco 1 open cluster using ∼200 d of photometric monitoring with the Next Generation Transit Survey. These stars span F5-M3 spectral types (1.2 M⊙ ≳ M ≳ 0.3 M⊙) and increase the number of known rotation periods in Blanco 1 by a factor of four. We determine rotat…