Search Publications
Maps of Solar Wind Plasma Precipitation onto Mercury's Surface: A Geographical Perspective
Henri, Pierre; Aizawa, Sae; Raines, Jim M. +7 more
Mercury is the closest planet to the Sun, possesses a weak intrinsic magnetic field, and has only a very tenuous atmosphere (exosphere). These three conditions result in a direct coupling between the plasma emitted from the Sun (namely, the solar wind) and Mercury's surface. The planet's magnetic field leads to a nontrivial pattern of plasma preci…
SOFIA and ALMA Investigate Magnetic Fields and Gas Structures in Massive Star Formation: The Case of the Masquerading Monster in BYF 73
Ryder, Stuart D.; Fissel, Laura M.; Pitts, Rebecca L. +4 more
We present Stratospheric Observatory For Infrared Astronomy (SOFIA) + Atacama Large Millimeter/submillimeter Array (ALMA) continuum and spectral-line polarization data on the massive molecular cloud BYF 73, revealing important details about the magnetic field morphology, gas structures, and energetics in this unusual massive star formation laborat…
B[e] Star CI Camelopardalis in the Optical Range
Burenkov, A. N.; Miroshnichenko, A. S.; Manset, N. +10 more
We report the results of photometric and spectroscopic monitoring of CI Cam within 24 years since its outburst in 1998. Over this time, we found a system component emitting in the He II 4686 Å emission line, on an elliptical orbit with a period of
Propagation of the Interplanetary Shock Induced Pulse: New Observations by the Global Navigation Satellite System
Zong, Qiugang; Zhang, Hui; Chen, Xingran +3 more
We revisited a typical interplanetary (IP) shock event on 7 November 2004, with high time resolution (1 s) total electron content (TEC) observations. The IP shock impinged on the dayside magnetopause at ∼18:27 UT, and launched a pulse into the magnetosphere. Using the multi-spacecraft timing method, the pulse was estimated to propagate at an angul…
A search for Kuiper belt occultations using the Weizmann Fast Astronomical Survey Telescope
Ofek, Eran O.; Polishook, David; Nir, Guy +2 more
Measuring the size distribution of small (kilometre-scale) Kuiper belt objects (KBOs) can help constrain models of Solar system formation and planetary migration. Such small, distant bodies are hard to detect with current or planned telescopes, but can be identified as sub-second occultations of background stars. We present the analysis of data fr…
Quasiperiodic Variations of Coronal Mass Ejections with Different Angular Widths
Mei, Ying; Wang, Feng; Deng, Hui +2 more
Coronal mass ejections (CMEs) are energetic expulsions of organized magnetic features from the Sun. The study of CME quasiperiodicity helps establish a possible relationship between CMEs, solar flares, and geomagnetic disturbances. We used the angular width of CMEs as a criterion for classifying the CMEs in the study. Based on 25 yr of observation…
Detections of [C II] 158 µm and [O III] 88 µm in a Local Lyman Continuum Emitter, Mrk 54, and Its Implications to High-redshift ALMA Studies
Hayes, Matthew; Inoue, Akio K.; Hashimoto, Takuya +17 more
We present integral field, far-infrared (FIR) spectroscopy of Mrk 54, a local Lyman continuum emitter, obtained with FIFI-LS on the Stratospheric Observatory for Infrared Astronomy. This is only the second time, after Haro 11, that [C II] 158 µm and [O III] 88 µm spectroscopy of the known LCEs have been obtained. We find that Mrk 54 ha…
Disentangling Stellar and Airglow Emission Lines from Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) Spectra
France, Kevin; Youngblood, Allison; Bourrier, Vincent +1 more
H I Lyα (1215.67 Å) and the O I triplet (1302.17, 1304.86, and 1306.03 Å) are bright far-ultraviolet (FUV) emission lines that trace the stellar chromosphere. Observations of stellar Lyα and O I using the Hubble Space Telescope's (HST) most sensitive FUV spectrograph, the Cosmic Origins Spectrograph (COS), are contaminated with geocoronal emission…
Surveying the Giant H II Regions of the Milky Way with SOFIA: V. DR7 and K3-50
Lim, Wanggi; De Buizer, James M.; Radomski, James T. +1 more
We present our fifth set of results from our mid-infrared imaging survey of Milky Way Giant H II (GH II) regions with our detailed analysis of DR7 and K3-50. We obtained 20/25 and 37 µm imaging maps of both regions using the FORCAST instrument on the Stratospheric Observatory For Infrared Astronomy. We investigate the multiscale properties o…
X-ray flashes from the low-mass X-ray binary IGR J17407−2808
Santangelo, A.; Ducci, L.; Romano, P. +4 more
IGR J17407−2808 is an enigmatic and poorly studied X-ray binary that was recently observed quasi-simultaneously with NuSTAR and XMM-Newton. In this paper we report the results of this observational campaign. During the first 60 ks of observation, the source was caught in a relatively low emission state characterised by a modest variability and an …