Search Publications
Characterising young visual M-dwarf binaries with near-infrared integral field spectra
Calissendorff, Per; Janson, Markus; Bonnefoy, Mickaël
We present the results from an integral field spectroscopy study of seven close visual binary pairs of young M-dwarf multiple systems. The target systems are part of the astrometric monitoring AstraLux programme, surveying hundreds of M-dwarf systems for multiplicity and obtaining astrometric epochs for orbital constraints. Our new VLT/SINFONI dat…
On the correctness of orbital solutions obtained from a small set of points. Orbit of HIP 53731
Mitrofanova, Arina; Dyachenko, Vladimir; Beskakotov, Anatoly +4 more
HIP 53731 is a binary consisting of stars of the spectral types K0 and K9. The orbit of this object was constructed previously by Cvetković et al. and improved by Tokovinin. It should be noted that there is a 180° ambiguity in the position angles of some published measurements. Speckle interferometric observations were obtained in 2007-2020 (21 me…
Radio Sounding Measurements of the Solar Corona Using Giant Pulses of the Crab Pulsar in 2018
Tokumaru, Munetoshi; Terasawa, Toshio; Sekido, Mamoru +2 more
Observations of the Crab pulsar at 327 MHz were made at the Toyokawa Observatory of the Institute for Space-Earth Environmental Research, during the solar occultation in mid-June 2018 to investigate the coronal plasma density in the weak sunspot cycle, Cycle 24. The dispersion measurements (DMs) were determined using giant pulses detected from obs…
Kepler Binary Stars in the NGC 6819 Open Cluster: KIC 5113146 and KIC 5111815
Bilir, Selçuk; Soydugan, Faruk; Soydugan, Esin +1 more
In this study, an investigation of two double-lined binary stars KIC 5113146 and KIC 5111815 in the NGC 6819 open cluster is presented based on both photometric and spectroscopic data. Simultaneous analysis of light and radial velocity curves was made and the absolute parameters of the systems' components were determined for the first time. We fin…
Discovery of recombining plasma associated with the candidate supernova remnant G189.6+3.3 with Suzaku
Nobukawa, Kumiko K.; Yamauchi, Shigeo; Pannuti, Thomas G. +1 more
We present the results of an X-ray spectral analysis of the northeast region of the candidate supernova remnant G189.6+3.3 with Suzaku. K-shell lines from highly ionized Ne, Mg, Si, and S were detected in the spectrum for the first time. In addition, a radiative recombining continuum (RRC) from He-like Si was clearly seen near 2.5 keV. This detect…
Seasonal thermal inertia variations at Gale crater: Role of active surface deposition phenomena
Rangarajan, Vidhya Ganesh; Ghosh, Mili
Thermal inertia has been found to play a significant role in planetary remote sensing applications, forming the basis of potentially all major lithological discriminations of the planetary surface. It has always been visualised to serve as a distinctive thermal property of the surface with its values remaining fairly constant at least for a short …
ASAS census of twins
Bakış, Volkan; Yücel, Gökhan; Eker, Zeki +2 more
Twin binaries were identified among the eclipsing binaries with δ > -30° listed in the All Sky Automated Survey (ASAS) catalogue. In addition to the known twin binaries in the literature, 68 new systems have been identified and photometric and spectroscopic observations were done. Colour, spectral type, temperature, ratio of radii and masses of…
A Large Massive Quiescent Galaxy Sample at z ∼ 1.2
Sawicki, Marcin; Cheng, Cheng; Huang, Jia-Sheng +8 more
In this paper we present a simple color-magnitude selection and obtain a large sample of 33,893 massive quiescent galaxies at intermediate redshifts (1 < z < 1.5). We choose the longest wavelength available in the Hyper-Supreme-Cam (HSC) deep survey, the Y band and i - Y color, to select the 4000 Å Balmer jump in passive galaxies to the high…
The effects of unresolved double degenerates in the white dwarf luminosity function
Rebassa-Mansergas, A.; Torres, S.; Toonen, S. +1 more
We perform an analysis of the single white dwarf and the double degenerate binary populations in the solar neighbourhood following a population synthesis approach to investigate the effects of unresolved double degenerates in the white dwarf luminosity function. We consider all unresolved synthetic binaries to be associated with fictitious effecti…
Variability of the Great Disk Shadow in Serpens
Green, Joel D.; Pontoppidan, Klaus M.; Salyk, Colette +2 more
We present dual-epoch Hubble Space Telescope imaging of the great disk shadow in the Serpens star-forming region. The near-infrared images show strong variability of the disk shadow, revealing dynamics of the inner disk on timescales of months. The Great Shadow is projected onto the Serpens reflection nebula by an unresolved protoplanetary disk su…