Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
96
datasets available to search
ShareScore release 0.7.1
Dataset results
96 results for “binary star”
{Core-Collapse Supernovae in Binaries as the Origin of Galactic Hyper-Runaway Stars
<p>Several stars detected moving at velocities near to or exceeding the Galactic escape speed likely originated in the Milky Way disc. We quantitatively explore the `binary supernova scenario' hypothesis, wherein these stars are ejected at large peculiar velocities when their close, massive binary companions undergo a core-collapse supernova and the binary is disrupted. We perform an extensive suite of binary population synthesis simulations evolving massive systems to determine the assumptions and parameters which most impact the ejection rate of fast stars. In a simulation tailored to eject fast stars, we find hyper-runaway star progenitor binaries composed of a massive (~30 M<sub>sun</sub>) primary and a ~3-4 M<sub>sun</sub> companion on an orbital period that shrinks to <1 day prior to the core collapse following a common envelope phase. The black hole remnant formed from the primary must receive a natal kick >1000 km/s to disrupt the binary and eject the companion at a large velocity. We compare the fast stars produced in these simulations to a contemporary census of early-type Milky Way hyper-runaway star candidates. We find that these rare objects may be produced in sufficient number only when poorly-constrained binary evolution parameters related to the strength of post-core collapse black hole natal kicks and common envelope efficiency are adjusted to values currently unsupported -- but not excluded -- by the literature. We discuss observational implications that may constrain the existence of these putative progenitor systems.</p>
The input files and associated data products for "Modeling High Mass X-ray Binaries to Double Neutron Stars through Common Envelope Evolution"
<p>Simulations were made using the version 12115 of the MESA code together with the x86_64-linux-20190830 MESA SDK. "template.zip" provides the MESA inlist files to reproduce our simulations. "CE_1.zip" provides our simulated results for a grid of binary systems with common envelope ejection efficiencies set to be 1.0. Different folders indicate the binary systems with different initial parameters. Inside each folder information can be found for binary properties in the "history.data" file. Each folder also contains the "result.txt" file with the terminal output of the simulation. "CE_3.zip", "CE_0.3.zip" and "CE_0.1.zip" are the same as "CE_1.zip" but with common envelope ejection efficiencies set to be 3.0, 0.3 and 0.1, respectively.</p>
Binary neutron-star simulation SXS:NSNS:0001
Simulation of a neutron-star binary system evolved by the <a href="https://www.black-holes.org/code/SpEC.html">SpEC code</a>.
Black-hole neutron-star binary simulation SXS:BHNS:0006
Simulation of a black-hole neutron-star binary system evolved by the <a href="https://www.black-holes.org/code/SpEC.html">SpEC code</a>.
Black-hole neutron-star binary simulation SXS:BHNS:0005
Simulation of a black-hole neutron-star binary system evolved by the <a href="https://www.black-holes.org/code/SpEC.html">SpEC code</a>.
Understanding The Unique Binary - Plaskett's Star
<p>In this work, I study the X-ray behaviour of the unique binary O-star system HD 47129, commonly known as Plaskett's star. With close orbit (orbital period ~14 days) and high mass loss, it becomes a colliding wind binary system. The secondary star has a bipolar magnetic field of ~3 kG and a centrifugally supported magnetosphere with a fast rotational period(~1 day). In O stars, shocks in unstable winds (due to very high mass-loss) are responsible for the production of million-degree plasma and the post-shock plasma cools initially via X-ray emission. So X-rays are tracers of stellar mass loss and sensitive diagnostics of stellar-wind physics. In a magnetic O star, plasma trapped in the magnetosphere will produce thermal X-ray emission, which will modulate as per the (magnetic) star’s rotation period (~1.2 day in our case). Previous literature used 29ks XMM data which had low resolution. I will present the analysis of archival Chandra data of 320 ks and obtain spectra, flux variability and other important results constraining X-ray emission properties of the system, along with a review of other telescope data. Further, I will discuss future observational ideas needed to probe different parts of this unique system.</p>
Effects of close binary evolution on the main-sequence morphology of young star clusters
<p>Star cluster animation to show their evolution in the Hertzsprung-Russell diagram.</p>
Black-hole neutron-star binary simulation SXS:BHNS:0008
Simulation of a black-hole neutron-star binary system evolved by the <a href="https://www.black-holes.org/code/SpEC.html">SpEC code</a>.
Black-hole neutron-star binary simulation SXS:BHNS:0010
Simulation of a black-hole neutron-star binary system evolved by the <a href="https://www.black-holes.org/code/SpEC.html">SpEC code</a>.
Black-hole neutron-star binary simulation SXS:BHNS:0009
Simulation of a black-hole neutron-star binary system evolved by the <a href="https://www.black-holes.org/code/SpEC.html">SpEC code</a>.
Black-hole neutron-star binary simulation SXS:BHNS:0008
Simulation of a black-hole neutron-star binary system evolved by the <a href="https://www.black-holes.org/code/SpEC.html">SpEC code</a>.
Black Hole - Neutron Star Binary Mergers
Gravitational radiation waveforms for black hole-neutron star coalescence calculations. The physical input is Newtonian physics, an ideal gas equation of state with varying compressibility (through the index gamma), and point-mass gravitational radiation back reaction, which is switched off in the simulation once the star is tidally disrupted. All the simulations are 3D, done using SPH.
Star-Forming Galaxies High-Mass X-Ray Binaries Catalog
Based on a homogeneous set of X-ray, infrared and ultraviolet observations from Chandra, Spitzer, GALEX and 2MASS archives, the authors studied populations of high-mass X-ray binaries (HMXBs) in a sample of 29 nearby star-forming galaxies and their relation with the star formation rate (SFR). In agreement with previous results, the authors find that HMXBs are a good tracer of the recent star formation activity in the host galaxy and their collective luminosity and number scale with the SFR, in particular, L<sub>X</sub> ~ 2.6 x 10<sup>39</sup> x SFR. However, the scaling relations still bear a rather large dispersion of rms ~ 0.4 dex, which the authors believe is of a physical origin. This table contains the catalog of 1055 compact X-ray sources detected within the D25 ellipse for galaxies of this sample which the authors used to construct the average X-ray luminosity function (XLF) of HMXBs with substantially improved statistical accuracy and better control of systematic effects than achieved in previous studies. The XLF follows a power law with slope of 1.6 in the log(L<sub>X</sub>) ~ 35 - 40 luminosity range with a moderately significant evidence for a break or cut-off at L<sub>X</sub> ~ 10<sup>40</sup> erg/s. As before, the authors did not find any features at the Eddington limit for a neutron star or a stellar mass black hole. In their paper, the authors discuss the implications of their results for the theory of binary evolution. In particular, they estimate the fraction of compact objects that once during their lifetime experienced an X-ray active phase powered by accretion from a high mass companion and obtain a rather large number, f<sub>X</sub> ~ 0.2 x (0.1 Myr/tau<sub>x</sub>), where tau<sub>x</sub> is the life time of the X-ray active phase. This is about 4 orders of magnitude more frequent than in low-mass X-ray binaries (LMXBs). The authors also derive constrains on the mass distribution of the secondary star in HMXBs. Note that, in their paper, the authors estimate that ~ 300 of the 1055 sources are likely to be background AGNs (cosmic X-ray background or CXB sources) and that the majority (<~ 700) of the remaining ~ 750 sources are young HMXB systems associated with star formation in their host galaxies. This table was created by the HEASARC in March 2012 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/MNRAS/419/2095">CDS Catalog J/MNRAS/419/2095</a> file hmxb.dat. This is a service provided by NASA HEASARC .
An observed population of intermediate-mass helium stars that have been stripped in binaries - Raw Spectroscopic Data
<p>This repository contains the raw spectroscopic data obtained for the stars described in the manuscript "An observed population of intermediate-mass helium stars stripped in binaries" by Drout, Götberg, Ludwig, Groh, de Mink, O'Grady and Smith. All data was obtained with the Magellan Echellette spectrograph (MagE) on the 6.5-meter Magellan-Baade telescope at Las Campanas Observatory, Chile. We organize the data as follows: </p><ul><li>Calibrations.tar.gz contains relevant calibration files. Specifically, bias frames, red flats, blue flats, and frames that can be used for echelle order-defintion in the MagE pipeline. </li><li>Files of the form Star1.tar.gz, Star2.tar.gz, etc. contain all of the individual science frames for each star that were used to make the final combined spectra published in Drout, Götberg, et al. as well as Thorium-Argon lamps taken immediately before or after each science frame. <br><br> </li></ul>
Binary Neutron Star Merger
Numerically-generated gravitational waveforms for binary neutron stars.
Binary neutron-star simulation SXS:NSNS:0001
<p>Simulation of a neutron-star binary system evolved by the <a href="https://www.black-holes.org/code/SpEC.html">SpEC code</a>.</p>
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.