Search Publications
Missions
Journals
Publication Years
The Discovery of Two LISA Sources within 0.5 kpc
Kilic, Mukremin; Bédard, A.; Kosakowski, Alekzander +1 more
We report the discovery of the brightest detached binary white dwarfs with periods less than an hour, which provide two new gravitational-wave verification binaries for the Laser Interferometer Space Antenna (LISA). The first one, SMSS J033816.16-813929.9 (hereafter J0338), is a 30.6 minute orbital period, g = 17.2 mag detached double white dwarf …
The MAVERIC Survey: Variable Jet-accretion Coupling in Luminous Accreting Neutron Stars in Galactic Globular Clusters
Strader, Jay; Bahramian, Arash; Maccarone, Thomas J. +9 more
Accreting neutron stars in low-mass X-ray binaries show outflows-and sometimes jets-in the general manner of accreting black holes. However, the quantitative link between the accretion flow (traced by X-rays) and outflows and/or jets (traced by radio emission) is much less well understood for neutron stars than for black holes, other than the gene…
The 2175 Å Dust Feature in Star-forming Galaxies at 1.3 ≤ z ≤ 1.8: The Dependence on Stellar Mass and Specific Star Formation Rate
Kartaltepe, Jeyhan S.; Daddi, Emanuele; Kashino, Daichi +10 more
We present direct spectroscopic measurements of the broad 2175 Å absorption feature in 505 star-forming main-sequence galaxies at 1.3 ≤ z ≤ 1.8 using individual and stacked spectra from the zCOSMOS-deep survey. Significant 2175 Å excess absorption features of moderate strength are measured, especially in the composite spectra. The excess absorptio…
Gaia DR2 giants in the Galactic dust - I. Reddening across the whole dust layer and some properties of the giant clump
Gontcharov, George A.; Mosenkov, Aleksandr V.
We consider a complete sample of 101 810 giants with Gaia Data Realease 2 (DR2) parallaxes ϖ within the red clump domain of the Hertzsprung-Russell diagram in the space cylinder with a radius of 700 pc around the Sun and a height of |Z| = 1800 pc. We use the Gaia DR2 GBP, GRP, and Wide-field Infrared Survey Explorer W3 photom…
β Cephei Pulsations in the High-mass Eclipsing System CW Cephei
Hong, Kyeongsoo; Lee, Jae Woo
CW Cep is an early B-type eclipsing binary with mass measurement precisions better than 1%. We report the discovery of pulsation signatures in the Transiting Exoplanet Survey Satellite time-series data of the system observed during Sectors 17 and 18. Our binary modeling indicates that the target star is a partially eclipsing detached system with m…
Reconstructing Substorms via Historical Data Mining: Is It Really Feasible?
Sitnov, M. I.; Tsyganenko, N. A.; Stephens, G. K. +4 more
The evolution of the low-latitude magnetosphere over the substorm cycle is reconstructed based on a new high-resolution 3D representation of the magnetic field and nearest-neighbor data mining. The study covers radial distances 2.5-25 RE and employs a record-large pool of spacecraft data taken during 1995-2019. The magnetospheric state …
Dynamics of recent landslides (<20 My) on Mars: Insights from high-resolution topography on Earth and Mars and numerical modelling
Mangold, N.; Pajola, M.; Cremonese, G. +13 more
Landslides are common features found on steep slopes on Mars and the role of water in their formation is an open question. Our study focuses on three young martian landslides whose mechanism of formation is unknown and knowing their formation mechanism could give us key information on recent martian climate and/or tectonics. They are less than 5 k…
The orbital evolution of UFDs and GCs in an evolving Galactic potential
Bekki, Kenji; Armstrong, Benjamin M.; Ludlow, Aaron D.
We use the second Gaia data release to investigate the kinematics of 17 ultra-faint dwarf galaxies (UFDs) and 154 globular clusters (GCs) in the Milky Way, focusing on the differences between static and evolving models of the Galactic potential. An evolving potential modifies a satellite's orbit relative to its static equivalent, though the differ…
Gas clumping in the outskirts of the Virgo cluster
Walker, S. A.; Mirakhor, M. S.
Observations of the intracluster medium (ICM) in the outskirts of the Virgo cluster with Suzaku have found the gas mass fraction in the northern direction to be significantly above the expected level, indicating that there may be a very high level of gas clumping on small scales in this direction. Here we explore the XMM-Newton data in the outskir…
An improved model for the spectra of discs of nova-like variables
Hubeny, Ivan; Long, Knox S.
The spectra arising from the discs of nova-like variables show many of the features seen in stellar atmospheres. They are typically modelled either from an appropriated weighted set of stellar atmospheres or a disc atmosphere with energy is dissipated near the disc plane, with the effective temperature distribution expected from a steady-state acc…