Search Publications
Self-consistent method to extract non-linearities from pulsating star light curves - I. Combination frequencies
Garrido, R.; Pascual-Granado, J.; Lares-Martiz, M.
Stellar pulsation is a common phenomenon and is sustained because of coherent driving mechanisms. When pulsations are driven by heat or convective mechanisms, it is usual to observe combination frequencies in the power spectra of the stellar light-curves. These combination frequencies are not solutions of the perturbed stellar structure equations.…
Intrusion of Magnetic Peninsula toward the Neighboring Opposite-polarity Region That Triggers the Largest Solar Flare in Solar Cycle 24
Inoue, Satoshi; Bamba, Yumi; Imada, Shinsuke
The largest X9.3 solar flare in solar cycle 24 and the preceding X2.2 flare occurred on 2017 September 6, in the solar active region NOAA 12673. This study aims to understand the onset mechanism of these flares via analysis of multiple observational data sets from the Hinode and Solar Dynamics Observatory and results from a nonlinear force-free fi…
FIDO-SIT: The First Forward Model for the In Situ Magnetic Field of CME-Driven Sheaths
Jian, L. K.; Nieves-Chinchilla, T.; Kay, C.
We have shown previously that the in situ magnetic field of coronal mass ejections (CMEs) can be well reproduced by simple, physics-driven flux rope models using the ForeCAT In situ Data Observer (FIDO, Kay et al., 2017). Here, we show that a similar approach can be taken to forward model the shock and sheath of a CME (Sheath Induced by Transient …
Saturn's Atmospheric Helium Abundance from Cassini Composite Infrared Spectrometer Data
Achterberg, Richard K.; Flasar, F. Michael
We use thermal infrared data from the Composite Infrared Spectrometer, which was on board the Cassini orbiter, to retrieve the helium abundance in Saturn's visible atmosphere. We find that the data is most consistent with a helium-to-hydrogen mole ratio in the range between 0.04 and 0.075, near the lower end of previous measurements, and implying …
The MOSDEF survey: an improved Voronoi binning technique on spatially resolved stellar populations at z ∼ 2
Siana, Brian; Shapley, Alice E.; Reddy, Naveen A. +12 more
We use a sample of 350 star-forming galaxies at 1.25 < z < 2.66 from the Multi-Object Spectrograph For Infra-Red Exploration (MOSFIRE) Deep Evolution Field survey to demonstrate an improved Voronoi binning technique that we use to study the properties of resolved stellar populations in z ~ 2 galaxies. Stellar population and dust maps are con…
Magnetospheric Interactions of Saturn's Moon Dione (2005-2015)
Krupp, N.; Jones, G. H.; Roussos, E. +5 more
The moon Dione orbits Saturn at 6.2 Saturn radii RS deep in the Kronian magnetosphere. In situ studies of the moon-magnetosphere interaction processes near Dione were possible with the Cassini/Huygens mission which flew by close to Dione five times at distances between 99 and 516 km. In addition, Cassini crossed Dione's L-shell more tha…
Strong Lensing Model of SPT-CL J0356-5337, a Major Merger Candidate at Redshift 1.0359
Mahler, Guillaume; Schrabback, Tim; Sharon, Keren +10 more
We present an analysis of the mass distribution inferred from strong lensing by SPT-CL J0356-5337, a cluster of galaxies at redshift $z=1.0359$ revealed in the follow-up of the SPT-SZ clusters. The cluster has an Einstein radius of ${\theta }_{{\rm{E}}}\simeq $ 14″ for a source at z = 3 and a mass within 500 kpc of ${M}_{500\mathrm{kpc}}=4.0\pm 0.…
Reconstructing Solar Wind Inhomogeneous Structures From Stereoscopic Observations in White Light: Solar Wind Transients in 3-D
Wang, Yuming; Shen, Fang; Shen, Chenglong +7 more
White-light images from Heliospheric Imager-1 (HI1) onboard the Solar Terrestrial Relations Observatory (STEREO) provide two-dimensional (2-D) global views of solar wind transients traveling in the inner heliosphere from two perspectives. How to retrieve the hidden three-dimensional (3-D) features of the transients from these 2-D images is intrigu…
Inferences About the Magnetic Field Structure of a CME with Both In Situ and Faraday Rotation Constraints
Wood, Brian E.; Nieves-Chinchilla, Teresa; Kooi, Jason E. +2 more
On 2012 August 2, two coronal mass ejections (CMEs; CME-1 and CME-2) erupted from the west limb of the Sun as viewed from Earth, and were observed in images from the white-light coronagraphs on the SOlar and Heliospheric Observatory and Solar TErrestrial RElations Observatory (STEREO) spacecraft. These events were also observed by the Very Large A…
Characterization of a local dust storm on Mars with REMS/MSL measurements and MARCI/MRO images
Hueso, Ricardo; Sánchez-Lavega, Agustín; Ordonez-Etxeberria, Iñaki +1 more
The REMS instrument on board the Curiosity rover has been collecting meteorological data from Gale crater on Mars since August 2012. A dust storm that developed north of Gale crater in sol 852 of the Mars Science Laboratory (MSL) mission spread above the location of the Curiosity rover during sols 853-855 (December 30, 2014 to January 1, 2015, are…