Search Publications
Missions
Journals
Publication Years
Qatar Exoplanet Survey: Qatar-8b, 9b, and 10b—A Hot Saturn and Two Hot Jupiters
Bieryla, Allyson; Latham, David W.; Esquerdo, Gilbert A. +26 more
In this paper we present three new extrasolar planets from the Qatar Exoplanet Survey. Qatar-8b is a hot Saturn, with M P = 0.37 M J and R P = 1.3 R J, orbiting a solar-like star every P orb = 3.7 days. Qatar-9b is a hot Jupiter with a mass of M P = 1.2 M J and a radius o…
Jensen-Shannon Complexity Measurements in Solar Wind Magnetic Field Fluctuations
Kivelson, Margaret G.; Weygand, James M.
Turbulent magnetic field fluctuations in the solar wind have been extensively investigated, but few studies have analyzed their complexity. Jensen-Shannon complexity maps of time series data provide a mathematical tool that can characterize fluctuations in laboratory experiments as stochastic, chaotic, or periodic phenomena. We apply this recently…
On the Source Position and Duration of a Solar Type III Radio Burst Observed by LOFAR
Kontar, Eduard P.; Zhang, PeiJin; Yu, SiJie +1 more
The flux of solar type III radio bursts have a time profile of rising and decay phases at a given frequency, which has been actively studied since the 1970s. Several factors that may influence the duration of a type III radio burst have been proposed. In this work, to study the dominant cause of the duration, we investigate the source positions of…
First Radial Velocity Results From the MINiature Exoplanet Radial Velocity Array (MINERVA)
Swift, Jonathan J.; Berlind, Perry; Calkins, Michael L. +52 more
The MINiature Exoplanet Radial Velocity Array (MINERVA) is a dedicated observatory of four 0.7 m robotic telescopes fiber-fed to a KiwiSpec spectrograph. The MINERVA mission is to discover super-Earths in the habitable zones of nearby stars. This can be accomplished with MINERVA’s unique combination of high precision and high cadence over long tim…
SOFIA/FORCAST resolves 30-40 µm extended dust emission in nearby active galactic nuclei
Togi, Aditya; Alonso-Herrero, Almudena; Fuller, Lindsay +7 more
We present arcsecond-scale observations of the active galactic nuclei (AGNs) of seven nearby Seyfert galaxies observed from the Stratospheric Observatory For Infrared Astronomy (SOFIA) using the 31.5 and 37.1 µm filters of the Faint Object infraRed CAmera for the SOFIA Telescope (FORCAST). We isolate unresolved emission from the torus and fi…
Multiwavelength observations of the EUV variable metal-rich white dwarf GD 394
Redfield, Seth; Casewell, Sarah L.; Burleigh, Matthew R. +13 more
We present new Hubble Space Telescope (HST) ultraviolet and ground-based optical observations of the hot, metal-rich white dwarf GD 394. Extreme-ultraviolet (EUV) observations in 1992-1996 revealed a 1.15 d periodicity with a 25 per cent amplitude, hypothesized to be due to metals in a surface accretion spot. We obtained phase resolved HST/Space T…
Superstrong photospheric magnetic fields in sunspot penumbrae
Solanki, S. K.; Lagg, A.; van Noort, M. +2 more
Context. Recently, there have been some reports of unusually strong photospheric magnetic fields (which can reach values of over 7 kG) inferred from Hinode SOT/SP sunspot observations within penumbral regions. These superstrong penumbral fields are even larger than the strongest umbral fields on record and appear to be associated with supersonic d…
Fine-scale structure in cometary dust tails I: Analysis of striae in Comet C/2006 P1 (McNaught) through temporal mapping
Morgan, Huw; Jones, Geraint H.; Battams, Karl +5 more
Striated features, or striae, form in cometary dust tails due to an as-yet unconstrained process or processes. For the first time we directly display the formation of striae, at C/2006 P1 McNaught, using data from the SOHO LASCO C3 coronagraph. The nature of this formation suggests both fragmentation and shadowing effects are important in the form…
Polarimetric and Photometric Investigation of the Dark Globule LDN 1225: Distance, Extinction Law, and Magnetic Fields
Jose, Jessy; Wang, Jia-Wei; Lai, Shih-Ping +7 more
We present results based on the optical R-band observations of the polarization of 280 stars distributed toward the dark globule LDN 1225. Parallaxes from Gaia data release 2 along with the polarization data of ∼200 stars have been used to (a) constrain the distance of LDN 1225 as 830 ± 83 pc, (b) determine the contribution of interstellar polariz…
Observations of the Venus Dramatic Response to an Extremely Strong Interplanetary Coronal Mass Ejection
Xu, Qi; Zhang, Tielong; Rong, Zhaojin +4 more
On 2011 November 5, Venus Express observed the impact of an extremely strong interplanetary coronal mass ejection (ICME) on Venus. As a result, the Venusian induced magnetosphere dramatically fluctuated during the ICME passage: the bow shock was compressed and broadened by the sheath and the body of the ICME, respectively; an atypically strong mag…