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Student Dust Counter: Status report at 38 AU
Stern, S. A.; Szalay, J. R.; Spencer, J. +8 more
The Student Dust Counter (SDC) is an in-situ dust detector aboard the New Horizons spacecraft observing the distribution of interplanetary dust particles (IDPs) with mass >10-12 g or approximately 0.5 µm in radius. New Horizons was launched on January 19th, 2006 and performed a fly-by of the Pluto system on July 14th, 2015. SDC…
Study of the long-term evolution of the accretion dynamics of GX 339-4
Mandal, S.; Aneesha, U.; Sreehari, H.
We study the dynamical behaviour of the galactic black hole source GX 339-4 during 2002-2011 outbursts using RXTE, Swift-XRT, XMM-Newton (PN) archival data. We present the spectral evolution of the source using four outburst data and discuss their similarities and differences between outbursts. We infer that the second peak in the 2002/03 and 2004…
Using Multiwavelength Variability to Explore the Connection among X-Ray Emission, the Far-ultraviolet H2 Bump, and Accretion in T Tauri Stars
Reynolds, M.; Grant, S.; Espaillat, C. C. +1 more
The high-energy radiation fields of T Tauri stars (TTS) should affect the surrounding circumstellar disk, having implications for disk transport and heating. Yet observational evidence of the effect of high-energy fields on disks is scarce. Here we investigate the connection between X-ray emission and the innermost gas disk by leveraging the varia…
Dynamics of wind and the dusty environments in the accreting T Tauri stars RY Tauri and SU Aurigae
Grankin, K. N.; Irsmambetova, T. R.; Gahm, G. F. +10 more
Classical T Tauri stars with ages of less than 10 Myr possess accretion discs. Magnetohydrodynamic processes at the boundary between the disc and the stellar magnetosphere control the accretion and ejections gas flows. We carried out a long series of simultaneous spectroscopic and photometric observations of the classical T Tauri stars, RY Tauri a…
Probability of magnification in the HubbleFrontier Fields clusters
Diego, J. M.; Bernstein, G. M.; Vega-Ferrero, J.
We present free-form gravitational lensing models derived with the WSLAP+ code for the six HubbleFrontier Fields clusters using the latest data available from the Frontier Fields Lensing Models v.4 collaboration. We present magnification maps in the lens plane and caustic maps in the source plane. From these maps, we derive the probability of magn…
Suppressed CO emission and high G/D ratios in z = 2 galaxies with sub-solar gas-phase metallicity
Daddi, E.; Béthermin, M.; Sargent, M. T. +6 more
We study a population of significantly sub-solar enrichment galaxies at z = 1.99, to investigate how molecular gas, dust, and star formation relate in low-metallicity galaxies at the peak epoch of star formation. We target our sample with several deep Atacama Large Millimeter/submillimeter Array and Very Large Array datasets, and find no individua…
Coronal Plasma Characterization via Coordinated Infrared and Extreme Ultraviolet Observations of a Total Solar Eclipse
Del Zanna, Giulio; DeLuca, Edward E.; Samra, Jenna E. +1 more
We present coordinated coronal observations of the 2017 August 21 total solar eclipse with the Extreme-ultraviolet Imaging Spectrometer (EIS) and the Airborne Infrared Spectrometer (AIR-Spec). These instruments provide an unprecedented view of the solar corona in two disparate wavelength regimes, the extreme ultraviolet (EUV) and the near- to mid-…
Resolved Imaging of the AR Puppis Circumbinary Disk
Marshall, J. P.; Ertel, S.; Milli, J. +14 more
Circumbinary disks are common around post-asymptotic giant branch (post-AGB) stars with a stellar companion on orbital timescales of a few 100 to few 1000 days. The presence of a disk is usually inferred from the system’s spectral energy distribution and confirmed, for a sub-sample, by interferometric observations. We used the Spectro-Polarimetric…
Development of a Fast CME and Properties of a Related Interplanetary Transient
Grechnev, V. V.; Kochanov, A. A.; Kiselev, V. I. +5 more
We study the development of a coronal mass ejection (CME) caused by a prominence eruption on 24 February 2011 and properties of a related interplanetary CME (ICME). The prominence destabilized, accelerated, and produced an M3.5 flare, a fast CME, and a shock wave. The eruption at the east limb was observed in quadrature by the Atmospheric Imaging …
To be or not to be: the case of the hot WHIM absorption in the blazar PKS 2155-304 sight line
Finoguenov, A.; Kaastra, J.; Bonamente, M. +8 more
The cosmological missing baryons at z < 1 most likely hide in the hot (T ≳ 105.5 K) phase of the warm hot intergalactic medium (WHIM). While the hot WHIM is hard to detect due to its high ionisation level, the warm (T ≲ 105.5 K) phase of the WHIM has been very robustly detected in the far-ultraviolet (FUV) band. We adopted…