Search Publications
Maps of Evolving Cloud Structures in Luhman 16AB from HST Time-resolved Spectroscopy
Apai, Dániel; Marley, Mark S.; Karalidi, Theodora +1 more
WISE J104915.57-531906.1 is the nearest brown dwarf binary to our solar system, consisting of two brown dwarfs in the L/T transition: Luhman 16A and B. In this paper, we present the first map of Luhman 16A, and maps of Luhman 16B for two epochs. Our maps were created by applying Aeolus, a Markov-Chain Monte Carlo code that maps the top-of-the-atmo…
Suzaku view of the Be/X-ray binary pulsar GX 304-1 during Type I X-ray outbursts
Naik, Sachindra; Jaisawal, Gaurava K.; Epili, Prahlad
We report the timing and spectral properties of the Be/X-ray binary pulsar GX 304-1 using two Suzaku observations during its 2010 August and 2012 January X-ray outbursts. Pulsations at ∼275 s were clearly detected in the light curves from both observations. Pulse profiles were found to be strongly energy-dependent. During the 2010 observation, the…
Reconstruction of spectral solar irradiance since 1700 from simulated magnetograms
Solanki, S. K.; Yeo, K. L.; Krivova, N. A. +3 more
Aims: We present a reconstruction of the spectral solar irradiance since 1700 using the SATIRE-T2 (Spectral And Total Irradiance REconstructions for the Telescope era version 2) model. This model uses as input magnetograms simulated with a surface flux transport model fed with semi-synthetic records of emerging sunspot groups.
Methods: T…
Microarcsecond VLBI Pulsar Astrometry with PSRπ. I. Two Binary Millisecond Pulsars with White Dwarf Companions
Lazio, T. J. W.; Chatterjee, S.; Cordes, J. M. +9 more
Model-independent distance constraints to binary millisecond pulsars (MSPs) are of great value to both the timing observations of the radio pulsars and multiwavelength observations of their companion stars. Astrometry using very long baseline interferometry (VLBI) can be employed to provide these model-independent distances with very high precisio…
Second Epoch Hubble Space Telescope Observations of Kepler's Supernova Remnant: The Proper Motions of Balmer Filaments
Blair, William P.; Reynolds, Stephen P.; Raymond, John C. +5 more
We report on the proper motions of Balmer-dominated filaments in Kepler’s supernova remnant using high resolution images obtained with the Hubble Space Telescope at two epochs separated by about 10 years. We use the improved proper motion measurements and revised values of shock velocities to derive a distance to Kepler of {5.1}-0.7
Geomorphological map of the Afekan Crater region, Titan: Terrain relationships in the equatorial and mid-latitude regions
Soderblom, Jason M.; Lorenz, Ralph D.; Turtle, Elizabeth P. +12 more
We carried out geomorphological mapping in a mid-latitude area surrounding the Afekan Crater region on Titan. We used Cassini RADAR (Synthetic Aperture Radar mode) data as the basemap, supplemented by Cassini RADAR microwave emissivity, Imaging Science Subsystem (ISS) infrared data, Visual and Infrared Mapping Spectrometer (VIMS) spectral images, …
Statistical properties of dwarf novae-type cataclysmic variables: the outburst catalogue
Drake, Andrew J.; Coppejans, Deanne L.; Knigge, Christian +5 more
The outburst catalogue contains a wide variety of observational properties for 722 dwarf nova (DN)-type cataclysmic variables (CVs) and 309 CVs of other types from the Catalina Real-time Transient Survey. In particular, it includes the apparent outburst and quiescent V-band magnitudes, duty cycles, limits on the recurrence time, upper and lower li…
Four-fluid MHD simulations of the plasma and neutral gas environment of comet 67P/Churyumov-Gerasimenko near perihelion
Hansen, Kenneth C.; Gombosi, Tamas I.; Combi, Michael R. +9 more
The neutral and plasma environment is critical in understanding the interaction of the solar wind and comet 67P/Churyumov-Gerasimenko (CG), the target of the European Space Agency's Rosetta mission. To serve this need and support the Rosetta mission, we have developed a 3-D four-fluid model, which is based on BATS-R-US (Block-Adaptive Tree Solarwi…
Revisiting the ultraluminous supersoft source in M 101: an optically thick outflow model
Soria, Roberto; Kong, Albert
The M 101 galaxy contains the best-known example of an ultraluminous supersoft source (ULS), dominated by a thermal component at kT ≈ 0.1 keV. The origin of the thermal component and the relation between ULSs and standard (broad-band spectrum) ultraluminous X-ray sources are still controversial. We re-examined the X-ray spectral and timing propert…
The initial conditions for stellar protocluster formation. III. The Herschel counterparts of the Spitzer Dark Cloud catalogue
Peretto, N.; Ward-Thompson, D.; Fuller, G. A. +4 more
Context. Galactic plane surveys of pristine molecular clouds are key for establishing a Galactic-scale view of star formation. For this reason, an unbiased sample of infrared dark clouds in the 10° < | l | < 65°, | b | < 1° region of the Galactic plane was built using Spitzer 8 µm extinction. However, intrinsic fluctuations in the m…