Search Publications
New Substellar Discoveries from Kepler and K2: Is There a Brown Dwarf Desert?
Latham, David W.; Carmichael, Theron W.; Vanderburg, Andrew M.
We present the discoveries of a brown dwarf (BD) and a low-mass star from the Kepler and K2 missions. The newly discovered BD is EPIC 212036875b and the low-mass star is KOI-607b. EPIC 212036875b has a mass of M b = 52.3 ± 1.9 M J, a radius of R b = 0.874 ± 0.017 R J, and orbits its host star in P = …
Formation of globular cluster systems - II. Impact of the cut-off of the cluster initial mass function
Gnedin, Oleg Y.; Choksi, Nick
Observations of young star clusters reveal that the high-mass end of the cluster initial mass function (CIMF) deviates from a pure power law and instead truncates exponentially. We investigate the effects of this truncation on the formation of globular cluster (GC) systems by updating our analytic model for cluster formation and evolution, which i…
Ultra-bright CO and [C I] Emission in a Lensed z = 2.04 Submillimeter Galaxy with Extreme Molecular Gas Properties
Rebolo, R.; Krips, M.; Dannerbauer, H. +4 more
We report the very bright detection of cold molecular gas with the IRAM NOEMA interferometer of the strongly lensed source WISE J132934.18+224327.3 at z = 2.04, the so-called Cosmic Eyebrow. This source has a similar spectral energy distribution from optical-mid/IR to submillimeter/radio but significantly higher fluxes than the well-known lensed S…
Observational Analysis on the Early Evolution of a CME Flux Rope: Preflare Reconnection and Flux Rope’s Footpoint Drift
Yang, Jiayan; Ji, Kaifan; Duan, Yadan +1 more
We study the early evolution of a hot-channel-like magnetic flux rope (MFR) toward eruption. Combining with imaging observation and magnetic field extrapolation, we find that the hot channel possibly originated from a preexisting seed MFR with a hyperbolic flux tube (HFT). In the precursor phase, three-dimensional tether-cutting reconnection at th…
Dust properties and star formation of approximately a thousand local galaxies
Barmby, P.; Lehnert, M.; Lianou, S. +2 more
Aims: We derived the dust properties for 753 local galaxies and examine how these relate to some of their physical properties. We present the derived dust emission properties, including model spectral energy distribution (SEDs), star formation rates (SFRs) and stellar masses, as well as their relations.
Methods: We modelled the global du…
X-ray spectra of the Fe-L complex
Raassen, A. J. J.; Gu, Liyi; Mao, Junjie +7 more
The Hitomi results on the Perseus cluster have led to improvements in our knowledge of atomic physics that are crucial for the precise diagnostic of hot astrophysical plasma observed with high-resolution X-ray spectrometers. However, modeling uncertainties remains, both within but especially beyond Hitomi's spectral window. A major challenge in sp…
The scattered disc of HR 8799
Booth, Mark; Krivov, Alexander V.; Löhne, Torsten +1 more
HR 8799 is a young F0-type star with four directly imaged giant planets and two debris belts, one located exterior and another one interior to the region occupied by the planetary orbits. Not only having an architecture similar to that of our Solar system but also revealing dissimilarities such as high masses of planets, a huge radial extent, and …
The Formation Conditions of the Wide Binary Class 0 Protostars within BHR 71
Bourke, Tyler L.; Codella, Claudio; Chen, Xuepeng +7 more
We present a characterization of the binary protostar system that is forming within a dense core in the isolated dark cloud BHR71. The pair of protostars, IRS1 and IRS2, are both in the Class 0 phase, determined from observations that resolve the sources from 1 µm out to 250 µm and from 1.3 mm to 1.3 cm. The resolved observations enabl…
Testing dark matter with Cherenkov light — prospects of H.E.S.S. and CTA for exploring minimal supersymmetry
Moulin, Emmanuel; Hryczuk, Andrzej; Jodłowski, Krzysztof +4 more
We provide an updated and improved study of the prospects of the H.E.S.S. and Cherenkov Telescope Array (CTA) experiments in testing neutralino dark matter in the Minimal Supersymmetric Standard Model with nine free parameters (p9MSSM). We include all relevant experimental constraints and theoretical developments, in particular a calculation of th…
Gas velocity structure of the Orion A integral-shaped filament
Stutz, Amelia M.; González Lobos, Vale
We present analysis of the gas kinematics of the integral-shaped filament (ISF) in Orion A using four different molecular lines, 12CO (1-0), 13CO (1-0), NH3 (1,1), and N2H+ (1-0). We describe our method to visualize the position-velocity (PV) structure using the intensity-weighted line velocit…