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Optical and Infrared Analysis of Type II SN 2006bc
Barlow, M. J.; Clayton, Geoffrey C.; Meixner, M. +8 more
We present nebular phase optical imaging and spectroscopy and near/mid-IR imaging of the Type II SN 2006bc. Observations reveal the central wavelength of the symmetric Hα line profile to be redshifted with respect to the host galaxy Hα emission by day 325. Such a phenomenon has been argued to result from an asymmetric explosion in the iron-peak el…
Brightness and Fluctuation of the Mid-infrared Sky from AKARI Observations toward the North Ecliptic Pole
Jeong, Woong-Seob; Matsuura, Shuji; Matsumoto, Toshio +1 more
We present the smoothness of the mid-infrared sky from observations by the Japanese infrared astronomical satellite AKARI. AKARI monitored the north ecliptic pole (NEP) during its cold phase with nine wave bands covering from 2.4 to 24 µm, out of which six mid-infrared bands were used in this study. We applied power-spectrum analysis to the …
Extended Magnetospheres in Pre-main-sequence Evolution: From T Tauri Stars to the Brown Dwarf Limit
Gómez de Castro, Ana I.; Marcos-Arenal, Pablo
Low-mass pre-main-sequence stars, i.e., T Tauri stars (TTSs), strongly radiate at high energies, from X-rays to the ultraviolet (UV). This excess radiation with respect to main-sequence cool stars (MSCSs) is associated with the accretion process, i.e., it is produced in the extended magnetospheres, in the accretion shocks on the stellar surface, a…
Identification of electron field-aligned current systems in Saturn's magnetosphere
Schippers, P.; André, N.; Gurnett, D. A. +3 more
Based on the analysis of 7 years of Cassini electron plasma spectrometer data near Saturn's equatorial plane, we computed the average directional electron current in the Northern and the Southern hemispheres separately. We determined the net current density by subtracting the downward electron current density (equator to the ionosphere) from the u…
Wide-field Survey of Emission-line Stars in IC 1396
Ishihara, D.; Ueno, M.; Watanabe, M. +3 more
We have made an extensive survey of emission-line stars in the IC 1396 H II region to investigate the low-mass population of pre-main-sequence (PMS) stars. A total of 639 Hα emission-line stars were detected in an area of 4.2 deg2 and their i' photometry was measured. Their spatial distribution exhibits several aggregates near the eleph…
The impact of a weak south pole on thermal convection in Enceladus’ ice shell
Showman, Adam P.; Tobie, Gabriel; Han, Lijie
Enceladus exhibits a strong hemispheric dichotomy of tectonism and heat flux, with geologically young, heavily tectonized terrains and a high heat flux in the South Polar Terrain (SPT) and relatively ancient terrains with presumably lower heat fluxes over the rest of the satellite. To understand the convective pattern and its relationship with sur…
A New Microlensing Event in the Doubly Imaged Quasar Q 0957+561
Kochanek, C. S.; Harris, Hugh C.; Fadely, Ross +6 more
We present evidence for ultraviolet/optical microlensing in the gravitationally lensed quasar Q 0957+561. We combine new measurements from our optical monitoring campaign at the United States Naval Observatory, Flagstaff, with measurements from the literature and find that the time-delay-corrected r-band flux ratio mA - mB ha…
The abundance of C18O and HDO in the envelope and hot core of the intermediate mass protostar NGC 7129 FIRS 2
Cernicharo, J.; Johnstone, D.; Fuente, A. +11 more
Context. NGC 7129 FIRS 2 is a young intermediate-mass (IM) protostar, which is associated with two energetic bipolar outflows and displays clear signs of the presence of a hot core. It has been extensively observed with ground based telescopes and within the WISH guaranteed time Herschel key program.
Aims: This paper is dedicated to the model…
Numerical Simulation of Three-dimensional Asymmetric Reconnection and Application to a Physical Mechanism of Penumbral Microjets
Shibata, Kazunari; Isobe, Hiroaki; Nakamura, Naoki
Three-dimensional (3D) component reconnection, where reconnecting field lines are not perfectly anti-parallel, is studied with a 3D magnetohydrodynamic simulation. In particular, we consider the asymmetry of the field strength of the reconnecting field lines. As the asymmetry increases, the generated reconnection jet tends to be parallel to strong…
An Over-and-out Halo Coronal Mass Ejection Driven by the Full Eruption of a Kinked Filament
Yang, Bo; Yang, Jiayan; Bi, Yi +5 more
Over-and-out coronal mass ejections (CMEs) represent a broad class of CMEs that come from flare-producing magnetic explosions of various sizes but are laterally far offset from the flare, and their productions can be depicted by the magnetic-arch-blowout scenario. In this paper, we present observations of an over-and-out halo CME from the full eru…