Search Publications
Variation of mass accretion rate on to the white dwarf in the dwarf nova VW Hyi in quiescence
Ishida, Manabu; Hayashi, Takayuki; Nakaniwa, Nozomi +1 more
We have analysed a series of Suzaku data and one data set of XMM-Newton of the SU UMa type dwarf nova VW Hyi in optical quiescence. The observed spectra in the 0.2-10 keV band are moderately well represented by multitemperature thermal plasma emission models with a maximum temperature of 5-9 keV and bolometric luminosity of (2.4-5.2) × 1030
An uppermost haze layer above 100 km found over Venus by the SOIR instrument onboard Venus Express
Vandaele, Ann Carine; Robert, Séverine; Mahieux, Arnaud +3 more
The Solar Occultation in the InfraRed (SOIR) instrument onboard Venus Express was designed to measure the Venusian atmospheric transmission at high altitudes (65–220 km) in the infrared range (2.2–4.3 µm) with a high spectral resolution. In this work, we investigate the optical properties of Venus's haze layer above 90 km using SOIR solar oc…
A Persistent, Large-Scale, and Ordered Electrodynamic Connection Between Saturn and Its Main Rings
Gurnett, D. A.; Dougherty, M. K.; Hospodarsky, G. B. +8 more
Auroral hiss emissions are ubiquitous in planetary magnetospheres, particularly in regions where electric current systems are present. They are generally diagnostic of electrodynamic coupling between conductive bodies, thus making auroral and moon-connected magnetic field lines prime locations for their detection. However, the role of Saturn's rin…
A New Mass Determination of (349) Dembowska with Close Encounters
Fu, Yanning; Yuan, Ye; Li, Fan
(349) Dembowska is a big R-type main-belt asteroid. A new and more precise determination of its mass, M, is presented. The high precision is achieved, in particular, using our generally applied criterion of selecting model parameters. This criterion takes into account the sensitivity to M of the available observables, i.e., the position of another…
Infrared Galaxies in the Field of the Massive Cluster Abell S1063: Discovery of a Luminous Kiloparsec-sized H II Region in a Gravitationally Lensed Infrared-luminous Galaxy at z = 0.6
Richard, Johan; Weiner, Benjamin; Egami, Eiichi +10 more
Using the Spitzer Space Telescope and Herschel Space Observatory, we have conducted a survey of IR galaxies in the field of the galaxy cluster AS1063 at z = 0.347, which is one of the most massive clusters known and a target of the Hubble Space Telescope (HST) Cluster Lensing and Supernova Survey with Hubble and the Frontier Field surveys. The Spi…
Spectroscopy of Supergiants with Infrared Excess: Results of 1998–2018
Klochkova, V. G.
We shortly summarize here the results of the second stage (1998–2018) of the detailed spectroscopy program of peculiar supergiants identified with galactic infrared sources, performed at the 6-m BTA telescope. The main aspect of the program is a search for the evolutionary variations in the chemical composition of stars, past the AGB stage and the…
The Nature of Class I Sources: Periodic Variables in Orion
Duchene, Gaspard; Ellithorpe, Elizabeth A.; Stahler, Steven W.
We present a quantitative, empirically based argument that at least some Class I sources are low-mass, pre-main-sequence stars surrounded by spatially extended envelopes of dusty gas. The source luminosity arises principally from stellar gravitational contraction, as in optically visible pre-main-sequence stars that lack such envelopes. We base ou…
Prospect for UV observations from the Moon. III. Assembly and ground calibration of Lunar Ultraviolet Cosmic Imager (LUCI)
Brosch, Noah; Mathew, Joice; Sreejith, A. G. +14 more
The Lunar Ultraviolet Cosmic Imager (LUCI) is a near-ultraviolet (NUV) telescope with all-spherical mirrors, designed and built to fly as a scientific payload on a lunar mission with Team Indus—the original Indian entry to the Google Lunar X-Prize. Observations from the Moon provide a unique opportunity of a stable platform with an unobstructed vi…
Comparative Study of Microwave Polar Brightening, Coronal Holes, and Solar Wind over the Solar Poles
Masuda, Satoshi; Yashiro, Seiji; Shibasaki, Kiyoto +3 more
We compared the long-term variation (1992 - 2017) in solar polar brightening observed with the Nobeyama Radioheliograph, the polar solar-wind velocity with interplanetary scintillation observations at the Institute for Space-Earth Environmental Research, and the coronal-hole distribution computed by potential-field calculations of the solar corona…
The influence of Ceres on the dynamical evolution of the Zdenekhorsky/Nemesis asteroid family
Carruba, V.; Barletta, W.
The Nemesis family, also identified as the Zdenekhorsky family by some authors, is an "incomplete" asteroid family in the central main belt, characterized by an asymmetric distribution between its left and right side, with most of its members located in the left part of the family. It has been suggested that this asymmetry, as well as the shape of…