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Herschel Observations of Dusty Debris Disks
Zuckerman, B.; Song, Inseok; Melis, Carl +4 more
We present results from two Herschel observing programs using the Photodetector Array Camera and Spectrometer. During three separate campaigns, we obtained Herschel data for 24 stars at 70, 100, and 160 µm. We chose stars that were already known or suspected to have circumstellar dust based on excess infrared (IR) emission previously measure…
The far-infrared behaviour of Herbig Ae/Be discs: Herschel PACS photometry
Marshall, J. P.; Montesinos, B.; Mendigutía, I. +3 more
Herbig Ae/Be objects are pre-main sequence stars surrounded by gas- and dust-rich circumstellar discs. These objects are in the throes of star and planet formation, and their characterisation informs us of the processes and outcomes of planet formation processes around intermediate mass stars. Here we analyse the spectral energy distributions of d…
The K2-ESPRINT Project IV. A Hot Jupiter in a Prograde Orbit with a Possible Stellar Companion
Tamura, Motohide; Hirano, Teruyuki; Sato, Bun'ei +19 more
We report on the detection and early characterization of a hot Jupiter in a three day orbit around K2-34 (EPIC 212110888), a metal-rich F-type star located in the K2 Cycle 5 field. Our follow-up campaign involves precise radial velocity (RV) measurements and high-contrast imaging using multiple facilities. The absence of a bright nearby source in …
Herschel Spectroscopic Observations of Little Things Dwarf Galaxies
Lebouteiller, Vianney; Schruba, Andreas; Cormier, Diane +8 more
We present far-infrared (FIR) spectral line observations of five galaxies from the Little Things sample: DDO 69, DDO 70, DDO 75, DDO 155, and WLM. While most studies of dwarfs focus on bright systems or starbursts due to observational constraints, our data extend the observed parameter space into the regime of low surface brightness dwarf galaxies…
The Nature of Active Galactic Nuclei with Velocity Offset Emission Lines
Harrison, F. A.; Stern, D.; Müller-Sánchez, F. +1 more
We obtained Keck/OSIRIS near-IR adaptive optics-assisted integral-field spectroscopy to probe the morphology and kinematics of the ionized gas in four velocity-offset active galactic nuclei (AGNs) from the Sloan Digital Sky Survey. These objects possess optical emission lines that are offset in velocity from systemic as measured from stellar absor…
ALMA observations of the Th 28 protostellar disk. A new example of counter-rotation between disk and optical jet
Pinte, C.; Ménard, F.; Hales, A. +8 more
Aims: Recently, differences in Doppler shifts across the base of four close classical T Tauri star jets have been detected with the HST in optical and near-ultraviolet (NUV) emission lines, and these Doppler shifts were interpreted as rotation signatures under the assumption of steady state flow. To support this interpretation, it is necessar…
Light walls around sunspots observed by the Interface Region Imaging Spectrograph
Zhang, J.; Hou, Y. J.; Li, T. +1 more
Context. The Interface Region Imaging Spectrograph (IRIS) mission provides high-resolution observations of the chromosphere and transition region. Using these data, some authors have reported the new finding of light walls above sunspot light bridges.
Aims: We try to determine whether the light walls exist somewhere else in active regions in …
A Comprehensive Dust Model Applied to the Resolved Beta Pictoris Debris Disk from Optical to Radio Wavelengths
Rieke, George H.; Gáspár, András; Su, Kate Y. L. +1 more
We investigate whether varying the dust composition (described by the optical constants) can solve a persistent problem in debris disk modeling—the inability to fit the thermal emission without overpredicting the scattered light. We model five images of the β Pictoris disk: two in scattered light from the Hubble Space Telescope (HST)/Space Telesco…
Comparison of absolute gain photometric calibration between Planck/HFI and Herschel/SPIRE at 545 and 857 GHz
Abergel, A.; Bernard, J. -P.; Crill, B. P. +14 more
We compare the absolute gain photometric calibration of the Planck/HFI and Herschel/SPIRE instruments on diffuse emission. The absolute calibration of HFI and SPIRE each relies on planet flux measurements and comparison with theoretical far-infrared emission models of planetary atmospheres. We measure the photometric cross calibration between the …
Earth's magnetosphere and outer radiation belt under sub-Alfvénic solar wind
Lugaz, Noé; Farrugia, Charles J.; Schwadron, Nathan A. +3 more
The interaction between Earth's magnetic field and the solar wind results in the formation of a collisionless bow shock 60,000-100,000 km upstream of our planet, as long as the solar wind fast magnetosonic Mach (hereafter Mach) number exceeds unity. Here, we present one of those extremely rare instances, when the solar wind Mach number reached ste…