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Hints for Small Disks around Very Low Mass Stars and Brown Dwarfs
Pascucci, Ilaria; Henning, Thomas; Ménard, François +6 more
The properties of disks around brown dwarfs and very low mass stars (hereafter VLMOs) provide important boundary conditions on the process of planet formation and inform us about the numbers and masses of planets than can form in this regime. We use the Herschel Space Observatory PACS spectrometer to measure the continuum and [O I] 63 µm lin…
Detection of Interstellar Ortho-D2H+ with SOFIA
Caselli, Paola; Menten, Karl M.; Okada, Yoko +9 more
We report on the detection of the ground-state rotational line of ortho-D2H+ at 1.477 THz (203 µm) using the German REceiver for Astronomy at Terahertz frequencies (GREAT) on board the Stratospheric Observatory For Infrared Astronomy (SOFIA). The line is seen in absorption against far-infrared continuum from the protost…
The Star Blended with the MOA-2008-BLG-310 Source Is Not the Exoplanet Host Star
Bennett, D. P.; Anderson, J.; Gould, A. +7 more
High-resolution Hubble Space Telescope (HST) image analysis of the MOA-2008-BLG-310 microlens system indicates that the excess flux at the location of the source found in the discovery paper cannot primarily be due to the lens star because it does not match the lens-source relative proper motion, {µ }{rel}, predicted by the microl…
Modelling and simulation of large-scale polarized dust emission over the southern Galactic cap using the GASS HI data
Boulanger, F.; Aumont, J.; Bock, J. J. +8 more
The Planck survey has quantified polarized Galactic foregrounds and established that they are a main limiting factor in the quest for the cosmic microwave background B-mode signal induced by primordial gravitational waves during cosmic inflation. Accurate separation of the Galactic foregrounds therefore binds this quest to our understanding of the…
On the redshift distribution and physical properties of ACT-selected DSFGs
Frayer, D. T.; Bond, J. R.; Partridge, B. +25 more
We present multi-wavelength detections of nine candidate gravitationally lensed dusty star-forming galaxies (DSFGs) selected at 218 GHz (1.4 mm) from the Atacama Cosmology Telescope (ACT) equatorial survey. Among the brightest ACT sources, these represent the subset of the total ACT sample lying in Herschel SPIRE fields, and all nine of the 218 GH…
Characterization of the VVV Survey RR Lyrae Population across the Southern Galactic Plane
Valenti, Elena; Minniti, Dante; Rejkuba, Marina +14 more
Deep near-IR images from the VISTA Variables in the Vía Láctea (VVV) Survey were used to search for RR Lyrae stars in the Southern Galactic plane. A sizable sample of 404 RR Lyrae of type ab stars was identified across a thin slice of the fourth Galactic quadrant (295° < ℓ < 350°, -2.°24 < b < -1.°05). The sample’s distance distributio…
Early cosmology constrained
Verde, Licia; Jimenez, Raul; Heavens, Alan F. +2 more
We investigate our knowledge of early universe cosmology by exploring how much additional energy density can be placed in different components beyond those in the ΛCDM model. To do this we use a method to separate early- and late-universe information enclosed in observational data, thus markedly reducing the model-dependency of the conclusions. We…
The power of teaming up HST and Gaia: the first proper motion measurement of the distant cluster NGC 2419
Massari, D.; Helmi, A.; Fiorentino, G. +2 more
Aims: We present the first measurement of the proper motion and orbit of the very distant and intriguing globular cluster NCG 2419.
Methods: We have combined data from HST and Gaia DR1 to derive the relative proper motions of stars in the direction of the cluster. To tie these to an absolute reference frame, we have used a background gal…
Non-local Thermodynamic Equilibrium Stellar Spectroscopy with 1D and >3D< Models. II. Chemical Properties of the Galactic Metal-poor Disk and the Halo
Kovalev, Mikhail; Hansen, Camilla Juul; Bergemann, Maria +5 more
From exploratory studies and theoretical expectations it is known that simplifying approximations in spectroscopic analysis (local thermodynamic equilibrium (LTE), 1D) lead to systematic biases of stellar parameters and abundances. These biases depend strongly on surface gravity, temperature and, in particular, for LTE versus non-LTE (NLTE), on me…
Molecular gas, dust, and star formation in galaxies. I. Dust properties and scalings in 1600 nearby galaxies
Magnelli, B.; Daddi, E.; Elbaz, D. +8 more
Context. Dust and its emission is increasingly being used to constrain the evolutionary stage of a galaxy. A comprehensive characterization of dust, best achieved in nearby bright galaxies, is thus a highly useful resource.
Aims: We aim to characterize the relationship between dust properties (mass, luminosity, and temperature) and their rela…