Search Publications
Long-term pulse period evolution of the ultra-luminous X-ray pulsar NGC 7793 P13
Ptak, A.; Stern, D.; Fabian, A. C. +14 more
Ultra-luminous X-ray pulsars (ULXPs) provide a unique opportunity to study persistent super-Eddington accretion. Here we present the results of a long-term monitoring campaign of ULXP NGC 7793 P13, focusing on the pulse period evolution and the determination of the orbital ephemeris. Over our four year monitoring campaign with Swift, XMM-Newton, a…
The Far Ultraviolet M-dwarf Evolution Survey. I. The Rotational Evolution of High-energy Emissions
France, Kevin; Youngblood, Allison; Pineda, J. Sebastian
M-dwarf stars are prime targets for exoplanet searches because of their close proximity and favorable properties for both planet detection and characterization. However, the potential habitability and atmospheric characterization of these exoplanetary systems depends critically on the history of high-energy stellar radiation from X-rays to NUV, wh…
Sum of the masses of the Milky Way and M31: A likelihood-free inference approach
Lahav, Ofer; Hoffman, Yehuda; Whiteway, Lorne +3 more
We use density estimation likelihood-free inference, Λ cold dark matter simulations of ∼2 M galaxy pairs, and data from Gaia and the Hubble Space Telescope to infer the sum of the masses of the Milky Way and Andromeda (M31) galaxies, the two main components of the local group. This method overcomes most of the approximations of the traditional tim…
Obliquity Constraints on the Planetary-mass Companion HD 106906 b
Morley, Caroline V.; Bowler, Brendan P.; Bryan, Marta L. +2 more
We constrain the angular momentum architecture of HD 106906, a 13 ± 2 Myr old system in the ScoCen complex composed of a compact central binary, a widely separated planetary-mass tertiary HD 106906 b, and a debris disk nested between the binary and tertiary orbital planes. We measure the orientations of three vectors: the companion spin axis, comp…
The impact of mixing treatments on cloud modelling in 3D simulations of hot Jupiters
Sing, D. K.; Parmentier, V.; Mikal-Evans, T. +7 more
We present results of 3D hydrodynamical simulations of HD209458b including a coupled, radiatively active cloud model (EDDYSED). We investigate the role of the mixing by replacing the default convective treatment used in previous works with a more physically relevant mixing treatment (Kzz) based on global circulation. We find that uncert…
Automated Multi-Dataset Analysis (AMDA): An on-line database and analysis tool for heliospheric and planetary plasma data
André, N.; Fedorov, A.; Budnik, E. +27 more
Accessing, visualizing and analyzing heterogeneous plasma datasets has always been a tedious task that hindered students and senior researchers as well. Offering user friendly and versatile tools to perform basic research tasks is therefore pivotal for data centres including the Centre de Données de la Physique des Plasmas (CDPP http://www.cdpp.eu…
The Atacama Cosmology Telescope: Microwave Intensity and Polarization Maps of the Galactic Center
Hasselfield, Matthew; Sifón, Cristóbal; Aiola, Simone +30 more
We present arcminute-resolution intensity and polarization maps of the Galactic center made with the Atacama Cosmology Telescope. The maps cover a 32 deg2 field at 98, 150, and 224 GHz with ∣l∣ ≤ 4°, ∣b∣ ≤ 2°. We combine these data with Planck observations at similar frequencies to create coadded maps with increased sensitivity at large…
Radio halos in a mass-selected sample of 75 galaxy clusters. I. Sample selection and data analysis
Brunetti, G.; Pratt, G. W.; Kale, R. +9 more
Context. Radio halos are synchrotron diffuse sources at the centre of a fraction of galaxy clusters. The study of large samples of clusters with adequate radio and X-ray data is necessary to investigate the origin of radio halos and their connection with the cluster dynamics and formation history.
Aims: The aim of this paper is to compile a w…
Mapping the 3D Kinematical Structure of the Gas Disk of HD 169142
Öberg, Karin; Bae, Jaehan; Teague, Richard +1 more
The disk around HD 169142 has been suggested to host multiple embedded planets due to the range of structures observed in the dust distributions. We analyze archival Atacama Large (sub-) Millimetre Array observations of 12CO (2-1), 13CO (2-1), and C18O (2-1) to search for large-scale kinematic structures associated…
Measuring Turbulence with Young Stars in the Orion Complex
Kounkel, Marina; Li, Hui; Ha, Trung +2 more
Stars form in molecular clouds in the interstellar medium (ISM) with a turbulent kinematic state. Newborn stars therefore should retain the turbulent kinematics of their natal clouds. Gaia DR2 and APOGEE-2 surveys in combination provide three-dimensional (3D) positions and 3D velocities of young stars in the Orion Molecular Cloud Complex. Using th…