Search Publications

Haze Seasonal Variations of Titan's Upper Atmosphere during the Cassini Mission

West, Robert A.; Vinatier, Sandrine; Seignovert, Benoît +1 more

This study presents a 13 yr survey of haze UV extinction profiles, monitoring the temporal evolution of the detached haze layer (DHL) in Titan's upper atmosphere (350-600 km). As reported by West et al. (GRL vol.38, L06204) at the equator, we show that the DHL was present at all latitudes below 55°N during the northern winter (2004-2009). Subseque…

Detection of Lyman Continuum from 3.0 < z < 3.5 Galaxies in the HETDEX Survey

Finkelstein, Steven L.; Schneider, Donald P.; Chisholm, John +15 more

Questions as to what drove the bulk reionization of the universe, how that reionization proceeded, and how the hard ionizing radiation reached the intergalactic medium remain open and debated. Observations probing that epoch are severely hampered by the increasing amounts of neutral gas with increasing redshift, so a small, but growing, number of …

Rapid Single Image-Based DTM Estimation from ExoMars TGO CaSSIS Images Using Generative Adversarial U-Nets

Tao, Yu; Muller, Jan-Peter; Conway, Susan J. +5 more

Observations with the Differential Speckle Survey Instrument. X. Preliminary Orbits of K-dwarf Binaries and Other Stars

Henry, Todd J.; Clark, Catherine A.; van Belle, Gerard T. +8 more

This paper details speckle observations of binary stars taken at the Lowell Discovery Telescope, the WIYN telescope, and the Gemini telescopes between 2016 January and 2019 September. The observations taken at Gemini and Lowell were done with the Differential Speckle Survey Instrument (DSSI), and those done at WIYN were taken with the successor in…

Magnetic dipole and electric quadrupole absorption in carbon dioxide

Montmessin, F.; Fedorova, A.; Korablev, O. I. +3 more

Magnetic dipole and electric quadrupole absorption in carbon dioxide are addressed in details. The selection rules for both processes are presented. The equations for the line intensities are given. In the case of the quadrupole absorption the Herman-Wallis functions are derived. The results of the present paper were used in the analysis of the ca…

Observations of a prominence eruption and loop contraction

Joshi, Bhuwan; Schmieder, Brigitte; Joshi, Reetika +3 more

Context. Prominence eruptions provide key observations to understand the launch of coronal mass ejections as their cold plasma traces a part of the unstable magnetic configuration.
Aims: We select a well observed case to derive observational constraints for eruption models.
Methods: We analyze the prominence eruption and loop expansion a…

The Balloon-Borne Investigation of Temperature and Speed of Electrons in the Corona (BITSE): Mission Description and Preliminary Results

Cho, K. -S.; Kim, Y. -H.; Gopalswamy, N. +16 more

We report on the Balloon-borne Investigation of Temperature and Speed of Electrons in the corona (BITSE) mission launched recently to observe the solar corona from ≈3 Rs to 15 Rs at four wavelengths (393.5, 405.0, 398.7, and 423.4 nm). The BITSE instrument is an externally occulted single stage coronagraph developed at NASA's Goddard Space Flight …

Simultaneous X-ray and radio observations of the transitional millisecond pulsar candidate CXOU J110926.4-650224. The discovery of a variable radio counterpart

Campana, S.; de Martino, D.; Rea, N. +15 more

We present the results of simultaneous observations of the transitional millisecond pulsar (tMSP) candidate CXOU J110926.4-650224 with the XMM-Newton satellite and the MeerKAT telescope. The source was found at an average X-ray luminosity of L_X ≃ 7 × 10³³ erg s⁻¹ over the 0.3−10 keV band (assumin…

Disentangling the multiphase circumgalactic medium shared between a dwarf and a massive star-forming galaxy at z∼0.4

Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +4 more

The multiphase circumgalactic medium (CGM) arises within the complex environment around a galaxy, or collection of galaxies, and possibly originates from a wide range of physical mechanisms. In this paper, we attempt to disentangle the origins of these multiphase structures and present a detailed analysis of the quasar field Q0122-003 field using …

Imaging and Spectral Observations of a Type-II Radio Burst Revealing the Section of the CME-Driven Shock That Accelerates Electrons

Gopalswamy, Nat; Kumari, Anshu; Patel, Ritesh +4 more

We report on a multi-wavelength analysis of the 26 January 2014 solar eruption involving a coronal mass ejection (CME) and a Type-II radio burst, performed by combining data from various space and ground-based instruments. An increasing standoff distance with height shows the presence of a strong shock, which further manifests itself in the contin…