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Testing light-traces-mass in Hubble Frontier Fields Cluster MACS-J0416.1-2403
Liesenborgs, Jori; Mohammed, Irshad; Saha, Prasenjit +2 more
We reconstruct the projected mass distribution of a massive merging Hubble Frontier Fields cluster MACSJ0416 using the genetic algorithm based free-form technique called Grale. The reconstructions are constrained by 149 lensed images identified by Jauzac et al. using HFF data. No information about cluster galaxies or light is used, which makes our…
Flux transfer event observation at Saturn's dayside magnetopause by the Cassini spacecraft
Coates, Andrew J.; Arridge, Christopher S.; Waite, J. Hunter +6 more
We present the first observation of a flux rope at Saturn's dayside magnetopause. This is an important result because it shows that the Saturnian magnetopause is conducive to multiple X-line reconnection and flux rope generation. Minimum variance analysis shows that the magnetic signature is consistent with a flux rope. The magnetic observations w…
On the propagation of a geoeffective coronal mass ejection during 15-17 March 2015
Webb, D. F.; Wang, Yuming; Shen, Fang +11 more
The largest geomagnetic storm so far, called 2015 St. Patrick's Day event, in the solar cycle 24 was produced by a fast coronal mass ejection (CME) originating on 15 March 2015. It was an initially west-oriented CME and expected to only cause a weak geomagnetic disturbance. Why did this CME finally cause such a large geomagnetic storm? We try to f…
ALMA Observations of the Debris Disk of Solar Analog τ Ceti
MacGregor, Meredith A.; Matthews, Brenda C.; Wilner, David J. +4 more
We present 1.3 mm observations of the Sun-like star τ Ceti with the Atacama Large Millimeter/submillimeter Array that probe angular scales of ∼ 1\prime\prime (4 au). This first interferometric image of the τ Ceti system, which hosts both a debris disk and a possible multiplanet system, shows emission from a nearly face-on belt of cold d…
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, …