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Application of a Modified Spheromak Model to Simulations of Coronal Mass Ejection in the Inner Heliosphere
Pogorelov, Nikolai V.; Arge, Charles N.; Singh, Talwinder +1 more
The magnetic fields of interplanetary coronal mass ejections (ICMEs), which originate close to the Sun in the form of a flux rope, determine their geoeffectiveness. Therefore, robust flux rope-based models of CMEs are required to perform magnetohydrodynamic (MHD) simulations aimed at space weather predictions. We propose a modified spheromak model…
Evidence of Dust Grain Evolution from Extinction Mapping in the IC 63 Photodissociation Region
Williams, Benjamin F.; Gordon, Karl D.; Baes, Maarten +5 more
Photodissociation regions (PDRs) are parts of the ISM consisting of predominantly neutral gas, located at the interface between H II regions and molecular clouds. The physical conditions within these regions show variations on very short spatial scales, and therefore PDRs constitute ideal laboratories for investigating the properties and evolution…
PHL 417: a zirconium-rich pulsating hot subdwarf (V366 Aquarid) discovered in K2 data
Hermes, J. J.; Saio, H.; Reed, M. D. +6 more
The Kepler spacecraft observed the hot subdwarf star PHL 417 during its extended K2 mission, and the high-precision photometric light curve reveals the presence of 17 pulsation modes with periods between 38 and 105 min. From follow-up ground-based spectroscopy, we find that the object has a relatively high temperature of 35 600 K, a surface gravit…
On the Granulation and Irregular Variation of Red Supergiants
Jiang, Bi-Wei; Ren, Yi
The mechanisms and characteristics of the irregular variations of red supergiants (RSGs) are studied based on the RSG samples in the Small Magellanic Cloud (SMC), Large Magellanic Cloud (LMC), and M31. With the time-series data from the All-Sky Automated Survey for SuperNovae and Intermediate Palomar Transient Factory survey, we use the continuous…
K-CLASH: spatially resolving star-forming galaxies in field and cluster environments at z ≈ 0.2-0.6
Bunker, Andrew; Cappellari, Michele; Bureau, Martin +10 more
We present the KMOS-CLASH (K-CLASH) survey, a K-band Multi-Object Spectrograph (KMOS) survey, of the spatially resolved gas properties and kinematics of 191 (pre-dominantly blue) H α-detected galaxies at 0.2 ≲ z ≲ 0.6 in field and cluster environments. K-CLASH targets galaxies in four Cluster Lensing And Supernova survey with Hubble (CLASH) fields…
Possible Evidence of p-modes in Cassini Measurements of Saturn's Gravity Field
Iess, Luciano; Durante, Daniele; Markham, Steve +1 more
We analyze the range-rate residual data from Cassini's gravity experiment that cannot be explained with a static, zonally symmetric gravity field. We reproduce the data using a simple forward model of gravity perturbations from normal modes. To do this, we stack data from multiple flybys to improve sensitivity. We find a partially degenerate set o…
Spectral and emissivity analysis of the raised ramparts around Titan's northern lakes
Rodriguez, S.; Soderblom, J. M.; Janssen, M. A. +18 more
Some of Titan's small northern hemisphere lakes show raised rampart features (which are distinct from raised rims), and appear as SAR-bright mound-like annuli extending away from the lake for up to tens of kilometers from the shoreline. We investigate the infrared and microwave characteristics of these features using Cassini Visual and Infrared Ma…
Unravelling the enigmatic ISM conditions in Minkowski's object
Groves, Brent; Kewley, Lisa; Mukherjee, Dipanjan +7 more
Local examples of jet-induced star formation lend valuable insight into its significance in galaxy evolution and can provide important observational constraints for theoretical models of positive feedback. Using optical integral field spectroscopy, we present an analysis of the ISM conditions in Minkowski's object (z = 0.0189), a peculiar star-for…
Unveiling Sizes of Compact AGN Hosts with ALMA
Juneau, Stéphanie; Marchesi, Stefano; Dekel, Avishai +7 more
We present rest-frame far-infrared (FIR) and optical size measurements of active galactic nucleus (AGN) hosts and star-forming galaxies (SFGs) in the COSMOS field, enabled by high-resolution Atacama Large Millimeter/submillimeter Array (ALMA)/1 mm (0.″1-0.″4) and Hubble Space Telescope (HST)/F814W imaging (∼0.″1). Our sample includes 27 galaxies a…
Near-infrared Census of RR Lyrae Variables in the Messier 3 Globular Cluster and the Period-Luminosity Relations
Herczeg, Gregory J.; de Grijs, Richard; Rejkuba, Marina +4 more
We present new near-infrared (NIR), JHKs, time-series observations of RR Lyrae variables in the Messier 3 (NGC 5272) globular cluster using the WIRCam instrument at the 3.6 m Canada-France-Hawaii Telescope. Our observations cover a sky area of ∼21' × 21' around the cluster center and provide an average of 20 epochs of homogeneous JHK