Search Publications
Dust-obscured star-forming galaxies in the early universe
Wilkins, Stephen M.; Croft, Rupert; Lovell, Christopher C. +3 more
Motivated by recent observational constraints on dust reprocessed emission in star-forming galaxies at z ∼ 6 and above, we use the very large cosmological hydrodynamical simulation BLUETIDES to explore predictions for the amount of dust-obscured star formation in the early Universe (z > 8). BLUETIDES matches current observational constraints on…
Catalogue of {>} 55 MeV Wide-longitude Solar Proton Events Observed by SOHO, ACE, and the STEREOs at {≈} 1 AU During 2009 - 2016
Dresing, Nina; Heber, Bernd; Paassilta, Miikka +3 more
Based on energetic particle observations made at ≈1 AU, we present a catalogue of 46 wide-longitude (>45∘) solar energetic particle (SEP) events detected at multiple locations during 2009 - 2016. The particle kinetic energies of interest were chosen as >55 MeV for protons and 0.18 - 0.31 MeV for electrons. We make use of proton da…
Memberships of the Open Cluster NGC 6405 Based on a Combined Method: Gaussian Mixture Model and Random Forest
Gao, Xinhua
This paper presents a combined method of Gaussian mixture model and random forest to compute membership probabilities of stars by using large, high-dimensional data sets. A significant advantage of this method is that it allows us to easily identify likely cluster members in large data sets starting from small training samples. As a benchmark, we …
The cataclysmic variable QZ Lib: a period bouncer
Gänsicke, B. T.; Pala, A. F.; Mehner, A. +2 more
While highly evolved cataclysmic variables (CVs) with brown dwarf donors, often called `period bouncers', are predicted to make up ≃40-70 per cent of the Galactic CV population, only a handful of such systems are currently known. The identification and characterization of additional period bouncers is therefore important to probe this poorly under…
Gaia DR1 Evidence of Disrupting the Perseus Arm
Grand, Robert J. J.; Matsunaga, Noriyuki; Kawata, Daisuke +2 more
We have discovered a clear sign of the disruption phase of the Perseus arm in the Milky Way using Cepheid variables, taking advantage of the accurately measured distances of Cepheids and the proper motions from Gaia Data Release 1. Both the Galactocentric radial and rotation velocities of 77 Cepheids within 1.5 kpc of the Perseus arm are correlate…
Four New Eclipsing Mid M-dwarf Systems from the New Luyten Two Tenths Catalog
Latham, David W.; Berlind, Perry; Calkins, Michael L. +7 more
Using data from the MEarth-North and MEarth-South transit surveys, we present the detection of eclipses in four mid M-dwarf systems: LP 107-25, LP 261-75, LP 796-24, and LP 991-15. Combining the MEarth photometry with spectroscopic follow-up observations, we show that LP 107-25 and LP 796-24 are short-period (1.388 and 0.523 day, respectively) ecl…
Solar Energetic Particles (SEP) and Galactic Cosmic Rays (GCR) as tracers of solar wind conditions near Saturn: Event lists and applications
Krupp, N.; Thomsen, M. F.; Jackman, C. M. +10 more
The lack of an upstream solar wind monitor poses a major challenge to any study that investigates the influence of the solar wind on the configuration and the dynamics of Saturn's magnetosphere. Here we show how Cassini MIMI/LEMMS observations of Solar Energetic Particle (SEP) and Galactic Cosmic Ray (GCR) transients, that are both linked to energ…
The Hawaii Infrared Parallax Program. III. 2MASS J0249-0557 c: A Wide Planetary-mass Companion to a Low-mass Binary in the β Pic Moving Group
Kratter, Kaitlin M.; Dupuy, Trent J.; Kraus, Adam L. +6 more
We have discovered a wide planetary-mass companion to the β Pic moving group member 2MASS J02495639-0557352 (M6 VL-G) using Canada-France-Hawaii Telescope/WIRCam astrometry from the Hawaii Infrared Parallax Program. In addition, Keck laser guide star adaptive optics aperture-masking interferometry shows that the host is itself a tight binary. Alto…
Chemo-kinematics of the Milky Way from the SDSS-III MARVELS survey
da Costa, L. N.; Ogando, R. L. C.; Bizyaev, D. +20 more
Combining stellar atmospheric parameters, such as effective temperature, surface gravity, and metallicity, with barycentric radial velocity data provides insight into the chemo-dynamics of the Milky Way and our local Galactic environment. We analyse 3075 stars with spectroscopic data from the Sloan Digital Sky Survey III MARVELS radial velocity su…
The Spectral Nature of Titan's Major Geomorphological Units: Constraints on Surface Composition
Le Mouélic, S.; Rodriguez, S.; Sotin, C. +24 more
We investigate Titan's low-latitude and midlatitude surface using spectro-imaging near-infrared data from Cassini/Visual and Infrared Mapping Spectrometer. We use a radiative transfer code to first evaluate atmospheric contributions and then extract the haze and the surface albedo values of major geomorphological units identified in Cassini Synthe…