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A Search for Self-lensing Binaries with TESS and Constraints on their Occurrence Rate
El-Badry, Kareem; Yamaguchi, Natsuko; Sorabella, Nicholas M.
Five self-lensing binaries (SLBs) have been discovered with Kepler light curves. They contain white dwarfs (WDs) in AU-scale orbits that gravitationally lens solar-type companions. Forming SLBs likely requires common envelope evolution when the WD progenitor is an AGB star and has a weakly bound envelope. No SLBs have yet been discovered with data…
Centering algorithm of an unresolved primary and satellite system
Peng, Q. Y.; Guo, B. F.; Hao, J. N.
Affected by the Earth's atmosphere, the image of a primary and satellite system may appear unresolved, such as the dwarf planet Haumea system. It is found by experiments that neither the two-dimensional Gaussian nor modified moment centering algorithms can accurately measure the photocenter of an image of unresolved primary and satellite system ob…
Investigation of a W UMa-type contact binary GZ And in a physical triple system
Zheng, Jie; Jiang, Lin-Qiao
GZ And is a variable star within the visually observed multiple-star system ADS 1693. Recent observations have yielded new light curves for GZ And, obtained using the Xinglong 85-cm telescope and the Transiting Exoplanet Survey Satellite (TESS) satellite. These light curves, along with radial velocity curves, were analyzed simultaneously to ascert…
Time-variable diffuse γ-ray foreground
Siegert, Thomas
While the data analysis of γ-ray telescopes has now become more robust, some signals may be misinterpretations of a time-variable foreground emission from the Solar system, induced by low-energy cosmic-ray interactions with asteroids. Our goal is to provide emission templates for this time-variable diffuse γ-ray foreground by considering the popul…
Common origin of trapped volatiles in oxidized icy moons and comets
Johnson, Robert E.; Oza, Apurva V.
Following spacecraft encounters with comets 67P/C-G and 1P/Halley, it was surprising that O2, expected to be a very minor species in their comas, was observed to outgas at a few percent abundance during their ice sublimation phases. This challenged the direct connection suggested between comets and material in the interstellar medium (I…
Measurement of the Taylor Microscale and the Effective Magnetic Reynolds Number in the Solar Wind With Cluster
Nakamura, R.; Narita, Y.; Matthaeus, W. H. +6 more
We use magnetic field data from the Cluster mission to estimate the value of the Taylor microscale and the effective magnetic Reynolds number in the interplanetary solar wind. Turbulent cascades can be characterized by the spatial scale at which dissipation begins to impact the local energy transfer, estimated by the Taylor microscale, as well as …
Quiescent black hole X-ray binaries as multi-messenger sources
Calore, Francesca; Kantzas, Dimitrios
The origin of Galactic cosmic rays (CRs) is unknown even though they have traditionally been connected to supernovae based on energetic arguments. In the past decades, Galactic black holes in X-ray binaries (BHXBs) have been proposed as candidate sources of CRs, which revises the CR paradigm. BHXBs launch two relativistic jets during their outburs…
The Gaia-ESO Survey: No sign of multiple stellar populations in open clusters from their sodium and oxygen abundances
Baratella, M.; Randich, S.; Bragaglia, A. +9 more
Context. The light element (anti-)correlations shown by globular clusters (GCs) are the main spectroscopic signature of multiple stellar populations. These internal abundance variations provide us with fundamental constraints on the formation mechanism of stellar clusters.
Aims: Using Gaia-ESO, the largest and most homogeneous survey of open …
Unveiling the nature of two dwarf novae: CRTS J080846.2+313106 and V416 Dra
Scaringi, Simone; Schwope, Axel; Anupama, G. C. +8 more
We present the analysis of optical photometric and spectroscopic observations of two non-magnetic cataclysmic variables, namely CRTS J080846.2+313106 and V416 Dra. We find CRTS J080846.2+313106 to vary with a period of 4.9116 ± 0.0003 h, which was not found in earlier studies and which we provisionally suggest is the orbital period of the system. …
Bright-rimmed clouds in IC 1396: I. Dynamics
Güsten, Rolf; Ishihara, Daisuke; Okada, Yoko +14 more
Aims. We investigate the dynamical and physical structures of bright-rimmed clouds (BRCs) in a nearby H II region. We focused on carbon- and oxygen-bearing species that trace photon-dominated regions (PDRs) and warm molecular cloud surfaces in order to understand the effect of UV radiation from the exciting stars on the cloud structure. Methods. W…