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On Low Hubble Expansion Rate from Planck Data Anomalies
Capistrano, Abraão J. S.; Cabral, Luís A.; Marão, José A. P. F. +1 more
From the linear perturbations of Nash–Greene fluctuations of a background metric, we obtain profiles of Hubble function evolution H(z) and fσ8(z) measurements as compared with the ΛCDM results at intermediate redshifts 0.1<z<1. For parameter estimation, we use joint data from Planck Cosmic Microwave Background (CMB) likelihoods of CMB temper…
Recalculated Orbits Of Binaries and New Linear Solutions
Cvetković, Z.; Pavlović, R.
In this paper we present recalculated orbital elements for nine binaries: EGG 2Aa, Ab, COU 1085, COU 1897, COU 1006, A 578Aa, Ab, A 1400, A 606, BU 984, and BU 992. Seven binaries have orbital periods longer than 100 yr, and two binaries have shorter orbital periods, 38 and 76 yr. Also, we present linear solutions determined for three double stars…
Solar occultation observations of Saturn's rings with Cassini UVIS
Colwell, J. E.; Esposito, L. W.; Becker, T. M. +2 more
The Ultraviolet Imaging Spectrograph (UVIS) instrument onboard the Cassini spacecraft observed 41 solar occultations by Saturn's rings through its extreme ultraviolet (56-118 nm) spectrographic channel. These solar occultations complement the set of stellar occultations measured by the broadband UVIS High Speed Photometer in the far ultraviolet (1…
Investigating 2M1155-79B: A Nearby, Young, Low-mass Star Actively Accreting from a Nearly Edge-on, Dusty Disk
Schneider, Adam C.; Gagné, Jonathan; Kastner, Joel H. +5 more
We investigate the nature of an unusually faint member of the ϵ Cha association (D ~ 100 pc, age ~5 Myr), the nearest region of star formation of age <8 Myr. This object, 2MASS J11550336-7919147 (2M1155-79B), is a wide-separation (~580 au), comoving companion to low-mass (M3) ϵ Cha association member 2MASS J11550485-7919108 (2M1155-79A). We pre…
The kinematics and ionization structure of the extended emission-line region of QSO E1821+643
Robinson, A.; Seelig, T.; Rosborough, Sara A.
The most luminous quasars are created by major, gas-rich mergers and E1821+643, an optically luminous quasar situated at the centre of a cool-core cluster, appears to be in the late stages of the post-merger blowout phase. This quasar is also identified as a gravitational recoil candidate, in which the supermassive black hole (SMBH) has received a…
The First Photometric Study of W UMa Binary System V1833 Ori
Tanrıver, Mehmet; Bulut, Ahmet
The first photometric solution in the B, V, R c and I c filters of the short period V1833 Ori eclipsing binary is presented based on new ground-based CCD photometric observations. We analyzed the BVRI photometric light curves of the system, using PHOEBE 0.31a, a binary star modeling program, with the Wilson-Devinney metho…
X-ray emission from the microquasar S26 observed by XMM-Newton
Romero, G. E.; Rizzo, F. N.; Sotomayor Checa, P.
S26 is the microquasar with the most powerful jets observed in accreting stellar sources. The estimated kinetic power for its jets is of the order of the bolometric luminosity of some ultraluminous X-ray sources. If this power is coupled to the matter accretion onto the compact object, then S26 must be a super-accreting binary, similar to the gala…
Near-infrared Polarization from Unresolved Disks around Brown Dwarfs and Young Stellar Objects
Espaillat, Catherine C.; Pillai, Thushara G. S.; Rilinger, Anneliese M. +1 more
Wide-field near-infrared (NIR) polarimetry was used to examine disk systems around two brown dwarfs (BDs) and two young stellar objects (YSOs) embedded in the Heiles Cloud 2 (HCl2) dark molecular cloud in Taurus as well as numerous stars located behind HCl2. Inclined disks exhibit intrinsic NIR polarization due to scattering of photospheric light,…
Feasibility studies for a dust observatory between earth and the asteroid belt
Srama, Ralf; Klinkner, Sabine; Fugmann, Martin +17 more
Cosmic dust transports information about the composition and evolution of distant realms over space and time. Dust sources may be in our local neighbourhood, such as the surfaces of moons and small bodies, or further away, in the galactic environment. The interior of moons like Io or Enceladus are well known dust sources in our solar system. Dust …
A Search for recurrent novae among Far Eastern guest stars
Hoffmann, Susanne M.; Vogt, Nikolaus
According to recent theoretical studies, classical novae are expected to erupt every ∼ 105 years, while the recurrence time scale of modern recurrent novae (Nr) stars ranges from 10 to ∼ 100 years. To bridge this huge gap in our knowledge (three orders of magnitude in time scales), it appears attractive to consider historical…