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A Sequoia in the Garden: FSR 1758—Dwarf Galaxy or Giant Globular Cluster?
Monachesi, Antonela; Gómez, Facundo A.; Minniti, Dante +5 more
We present the physical characterization of FSR 1758, a new large, massive object very recently discovered in the Galactic Bulge. The combination of optical data from the 2nd Gaia Data Release and the DECam Plane Survey and near-IR data from the VISTA Variables in the Vía Láctea Extended Survey led to a clean sample of likely members. Based on thi…
Discovery of a Third Transiting Planet in the Kepler-47 Circumbinary System
Torres, Guillermo; Cochran, William D.; Endl, Michael +16 more
Of the nine confirmed transiting circumbinary planet systems, only Kepler-47 is known to contain more than one planet. Kepler-47 b (the “inner planet”) has an orbital period of 49.5 days and a radius of about 3 R ⊕. Kepler-47 c (the “outer planet”) has an orbital period of 303.2 days and a radius of about 4.7 R ⊕. Here we rep…
The dwarf galaxy satellite system of Centaurus A
Müller, Oliver; Jerjen, Helmut; Lelli, Federico +4 more
Dwarf galaxy satellite systems are essential probes to test models of structure formation, making it necessary to establish a census of dwarf galaxies outside of our own Local Group. We present deep FORS2 VI band images from the ESO Very Large Telescope (VLT) for 15 dwarf galaxy candidates in the Centaurus group of galaxies. We confirm nine dwarfs…
A Survey of C2H, HCN, and C18O in Protoplanetary Disks
Bergin, Edwin A.; Bergner, Jennifer B.; Loomis, Ryan A. +3 more
Molecular lines observed toward protoplanetary disks carry information about physical and chemical processes associated with planet formation. We present ALMA Band 6 observations of C2H, HCN, and C18O in a sample of 14 disks spanning a range of ages, stellar luminosities, and stellar masses. Using C2H and HCN hyper…
Using Herschel and Planck observations to delineate the role of magnetic fields in molecular cloud structure
Soler, Juan D.
We present a study of the relative orientation between the magnetic field projected onto the plane of sky (B⊥) on scales down to 0.4 pc, inferred from the polarized thermal emission of Galactic dust observed by Planck at 353 GHz, and the distribution of gas column density (NH) structures on scales down to 0.026 pc, derived fr…
Surface localization of gas sources on comet 67P/Churyumov-Gerasimenko based on DFMS/COPS data
Altwegg, Kathrin; Rubin, Martin; Läuter, Matthias +1 more
We reconstruct the temporal evolution of the source distribution for the four major gas species H2O, CO2, CO, and O2 on the surface of comet 67P/Churyumov-Gerasimenko during its 2015 apparition. The analysis applies an inverse coma model and fits to data between 2014 August 6 and 2016 September 5 measured with the …
Fundamental parameter accuracy of DA and DB white dwarfs in Gaia Data Release 2
Tremblay, P. -E.; Hollands, M. A.; Cunningham, T. +2 more
We report on a comparison of spectroscopic analyses for hydrogen (DA) and helium atmosphere (DB) white dwarfs with Gaia Data Release 2 (DR2) parallaxes and photometry. We assume a reddening law and a mass-radius relation to connect the effective temperatures (Teff) and surface gravities (log g) to masses and radii. This allows the compa…
The CARMENES search for exoplanets around M dwarfs. Photospheric parameters of target stars from high-resolution spectroscopy. II. Simultaneous multiwavelength range modeling of activity insensitive lines
Schmitt, J. H. M. M.; Nagel, E.; Amado, P. J. +25 more
We present precise photospheric parameters of 282 M dwarfs determined from fitting the most recent version of PHOENIX models to high-resolution CARMENES spectra in the visible (0.52-0.96 µm) and NIR wavelength range (0.96-1.71 µm). With its aim to search for habitable planets around M dwarfs, several planets of different masses have be…
The Apache Point Observatory Catalog of Optical Diffuse Interstellar Bands
Zhao, Gang; York, Donald G.; Welty, Daniel E. +7 more
Aiming for a new and more comprehensive DIB catalog between 4000 and 9000 Å, we revisited the Atlas Catalog based on the observations of HD 183143 and HD 204827. Twenty-five medium to highly reddened sight lines were selected, sampling a variety of spectral types of the background star and the interstellar environments. The median signal-to-noise …
AIMS - a new tool for stellar parameter determinations using asteroseismic constraints
Chaplin, William J.; Davies, Guy R.; Campante, Tiago L. +12 more
A key aspect in the determination of stellar properties is the comparison of observational constraints with predictions from stellar models. Asteroseismic Inference on a Massive Scale (AIMS) is an open source code that uses Bayesian statistics and a Markov Chain Monte Carlo approach to find a representative set of models that reproduce a given set…