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13 results for “Stars: low-mass”
Constraining the properties of dense neutron star cores: The case of the transient low-mass X-ray binary HETE J1900.1-2455
<p>This is a basic reproduction package for the paper "Constraining the properties of dense neutron star cores: The case of the transient low-mass X-ray binary HETE J1900.1-2455" by <a href="https://doi.org/10.1093/mnras/stab2202">N. Degenaar et al. (2021)</a>. It provides reduced data products, simulated data and scripts to allow the reproduction of the work performed in this paper. It also lists software used and data archives containing the public observational data.</p>
Asymmetric dark matter may alter the evolution of very low-mass stars and brown dwarfs
<p>MESA inlists and data files for "<a href="https://ui.adsabs.harvard.edu/?#abs/2011PhRvD..84j1302Z">Asymmetric dark matter may alter the evolution of very low-mass stars and brown dwarfs</a>"</p>
Supplement to "Transient Corotating Clumps Around Adolescent Low-Mass Stars From Four Years of TESS"
<p>This repository contains supplementary materials for the paper "Transient Corotating Clumps Around Adolescent Low-Mass Stars From Four Years of TESS", which will be submitted to the AAS journals in 2023.</p> <p><em>fig3_validation_plots.tar.gz</em> is a supplement to Figure 3 of the manuscript, and contains 240 pdf files for the 66 stars of interest.<br> <em>table1_MRT.csv</em> is a pipe-separated CSV version of Table 1 with all useful columns.<br> <em>table1_README.txt</em> is a README describing the columns in table1_MRT.csv and table1_short.csv.<br> <em>table1_short.csv</em> is a truncated version of <em>table_MRT.csv </em>with the columns displayed in the manuscript.</p>
Evolution models of helium white dwarf-main-sequence star merger remnants: the mass distribution of single low-mass white dwarfs
<p>Inlists and data for "<a href="https://ui.adsabs.harvard.edu/#abs/2018MNRAS.474..427Z/abstract">Evolution models of helium white dwarf-main-sequence star merger remnants: the mass distribution of single low-mass white dwarfs</a>"</p>
PTF1 J082340.04+081936.5: A Hot Subdwarf B Star with a Low-mass White Dwarf Companion in an 87-minute Orbit
<p>MESA inlists and run_star_extras associated with <a href="https://ui.adsabs.harvard.edu/?#abs/2017ApJ...835..131K">Kupfer et al. (2017)</a>. MESA version 8118.</p> <p>Publication DOI: <a href="https://doi.org/10.3847/1538-4357/835/2/131">10.3847/1538-4357/835/2/131</a></p>
X-ray Emission of Nearby Low-mass and Sun-like Stars with Directly Imageable Habitable Zones: X-ray Spectra and Light Curves
<p>This repository contains the X-ray light curves extracted from the XMM-Newton and Chandra observations and the best-fit X-ray spectral models (with and without emission lines) from all stars detected at high significance in Binder et al. (2024), ApJS, ..., ...</p> <p>Description of Files:</p> <h3>LightCurves.zip</h3> <p>Summary: Light curve files (327) for all stars detected at high significance; in FITS (BinTableHDU) format with 7-14 extensions. The following types of data are included:</p> <ul> <li>"*_source.lc" : EPIC/PN source light curves of stars detected with more than ~500 net counts in an XMM-Newton observation</li> <li>"*_bkg.lc" : EPIC/PN background light curves of stars detected with more than ~500 net counts in an XMM-Newton observation</li> <li>"*_sub_lc.fits" : Background-subtracted light curves of stars detected with more than ~50 net counts in a Chandra observation</li> </ul> <h3>Spectra.zip</h3> <p>Summary: Spectra (152) for all stars detected at high significance (with >500 net counts in Chandra observations and >2000 net counts in XMM-Newton observations) in ASCII (ECSV format). We provide both the continuum spectra and spectra containing line emission. For stars that exhibit X-ray count rate variability, we provide spectra for specific variability types (see Binder et al. 2024 for details). The following types of data are included:</p> <ul> <li>"*_continuum.dat" : Continuum-only best-fit spectra</li> <li>"*_lines.dat" : Best-fit spectra containing line emission</li> </ul>
Rotation Period Predictions for Low-mass Stars with Kinematic Information from Gaia DR3
<pre><strong>DR3_kine_prot_pred.csv:</strong> 17.6 million predicted periods for all stars with Gaia DR3 RVs. This data should only be used to vet periods and not directly as period measurements. Works best for stars with GBP-GRP > 1.5 and rotation period > 20 days. Do not work for fast-rotating low-mass stars. Column descriptions see below </pre> <p><strong>source_id</strong>: Gaia DR3 source_id</p> <p><strong>ra</strong>: Gaia DR3 ra measurements</p> <p><strong>dec</strong>: Gaia DR3 dec measurements</p> <p><strong>parallax</strong>: Gaia DR3 parallax measurements</p> <p><strong>bp_rp</strong>: Gaia DR3 G<sub>BP</sub>-G<sub>RP</sub> measurements</p> <p><strong>phot_g_mean_mag</strong>: Gaia DR3 G mag</p> <p><strong>abs_G</strong>: absolute Gaia G magnitude derived from Gaia DR3 G mag and parallax</p> <p><strong>ruwe</strong>: Gaia DR3 ruwe measurements </p> <p><strong>Prot_pred</strong>: Predicted periods using Gaia DR3 parameters and kinematics</p> <p> </p> <p><strong>vet_ztf_lowmass.csv</strong>: 65k vetted ZTF period measurements for stars with G<sub>BP</sub>-G<sub>RP</sub> > 1.5. Column descriptions see below</p> <p><strong>source_id</strong>: Gaia DR3 source_id</p> <p><strong>ra</strong>: Gaia DR3 ra measurements</p> <p><strong>dec</strong>: Gaia DR3 dec measurements</p> <p><strong>parallax</strong>: Gaia DR3 parallax measurements</p> <p><strong>bp_rp</strong>: Gaia DR3 G<sub>BP</sub>-G<sub>RP</sub> measurements</p> <p><strong>gmag</strong>: Gaia DR3 G mag</p> <p><strong>abs_G</strong>: absolute Gaia G magnitude derived from Gaia DR3 G mag and parallax</p> <p><strong>rv</strong>: Gaia DR3 rv measurements</p> <p><strong>Prot</strong>: measured and vetted periods from ZTF </p>
Spectral ANalog of Dwarfs (SAND) model atmospheres and Evolutionary Extension to SAND (SANDee) evolutionary models for low-mass stars and brown dwarfs
<p>Spectral ANalog of Dwarfs (SAND) is a new grid of model atmospheres for low-mass stars and brown dwarfs at a variety of chemical compositions, characteristic of various components of the Milky Way, including the galactic halo and globular clusters. The models were calculated using <strong>PHOENIX 15</strong></p> <p>A detailed description of SAND is available in RNAAS 2024 by Alvarado, Gerasimov, Burgasser, Brooks, Aganze and Theissen <a href="https://ui.adsabs.harvard.edu/abs/2024RNAAS...8..134A/abstract">[ADS]</a></p> <p>Evolutionary Extension to SAND (SANDee) is a new grid of evolutionary models that uses the SAND models for synthetic photometry and as atmosphere boundary conditions. SANDee is the first set of models that can reproduce the observed star/brown dwarf transition in globular clusters. SANDee models were calculated using <strong>MESA 23.05.1</strong></p> <p>A detailed description of SANDee is available in ApJ 2024 by Gerasimov, Bedin, Burgasser, Apai, Nardiello, Alvarado and Anderson <a href="https://ui.adsabs.harvard.edu/abs/2024arXiv240501634G/abstract">[ADS]</a></p> <p> </p> <p><strong>Directory structure:</strong></p> <pre><code>SAND.zip : SAND model atmospheres recommended : Subset of SAND atmospheres whose synthetic photometry maintains continuity as a function of temperature rest : The rest of SAND models (see notes on convergence below) SANDee.zip : SANDee evolutionary models BC : MESA atmosphere boundary condition tables for tau=100 at each chemistry MESA : MESA evolutionary models, organized first by chemistry, then by initial mass isogen.zip : Python script to generate model isochrones from SANDee and SAND models isogen.py : The script itself demo.ipynb : Jupyter notebook that demonstrates how the script can be used vega_bohlin_2004.dat : Standard spectrum of Vega for VEGAMAG photometry<br> Other *.dat : Transmission profiles for JWST filters used by the demo notebook custom.patch : Patch with author's changes to the MESA codebase HBL.mrt : Estimated true hydrogen-burning limits for each SAND/SANDee chemistry</code></pre>
Molecular gas budget of strongly magnified low-mass star-forming galaxies at cosmic noon Appendix
<p>Appendix of the article Molecular gas budget of strongly magnified low-mass star-forming galaxies at cosmic noon by V. Catán et al.</p>
A rich hydrocarbon chemistry and high C to O ratio in the inner disk around a very low-mass star
<p>This dataset includes selected portions of the JWST/MIRI spectrum of the J160532 disk analyzed in the paper by Tabone et al. (2023), to be published by Nature Astronomy. The original observational data are part of the Guaranteed Time Observation-MIRI programme ‘MIRI EC Protoplanetary and Debris Disks Survey’ (ID 1282) with number 47 and will become public on August 1st, 2023 on the MAST database https://archive.stsci.edu/. In addition, this release contains the best-fit slab models. Some basic information about the models can be found in the headers.</p> <p>The dataset consists of two data files. The first file contains the continuum subtracted JWST/MIRI spectrum of J160532 in the 12.5-14.7 <span class="math-tex">\(\mu\text{m}\)</span> region shown in Fig. 1 (right panel) of Tabone et al. (2023) where C2H2 emission is seen as a broad bump and prominent narrower features. The best-fit slab models correspond to the highly optically thick C2H2 component I and the optically thinner C2H2 component II. The second file is the continuum subtracted JWST/MIRI spectrum in the 14.6-16.1 <span class="math-tex">\(\mu\text{m}\)</span> region shown in Fig. 2 of Tabone et al. (2023) where C6H6 (benzene), CO2, and C4H2 features are detected. The best-fit slab models for the three species are also provided. Fig. 1 (righ panel) and Fig. 2 of Tabone et al. (2023) can be reproduced using the two Python scripts.</p>
Probing fossil magnetic field effects in the core of evolved low-mass stars using mixed-mode frequencies
<p>The recent discovery of the moderate differential rotation between the core and the envelope of intermediate-mass (IM) main-sequence and evolved stars, and the population of IM red giants presenting a surprisingly low-amplitude of their mixed modes (i.e. modes that behave as acoustic modes in their external envelope and as gravity modes in their core) could both be the signature of a strong magnetic field trapped inside the radiative regions of IM stars. Indeed, stars more massive than 1.1 solar mass are known to develop a convective core during their main sequence. The field generated by the dynamo triggered by this convection could be the progenitor of a strong fossil magnetic field trapped inside the core of the star for the rest of its evolution. In this context, the mixed modes observed thanks to space-based asteroseismology can constitute an excellent probe of the deepest layers in IM evolved stars: such magnetic fields may impact their propagation inside the core of these stars, and these perturbations should be visible in asteroseismic data. To unravel which constraints can be obtained from these observations, we theoretically investigate the effects of a plausible mixed magnetic field with various amplitudes on the mixed-mode frequencies of red giants. Applying a perturbative method, we estimate the magnetic splitting of the frequencies of simulated mixed dipolar modes that depends on the magnetic field strength and its configuration. A complete asymptotic analysis is derived, showing the potential of asteroseismology to probe the magnetism at each depth as this is done for stellar rotation. The effects of the mass and the metallicity of the stars are also explored. Finally, we infer an upper limit for the strength of the field and the associated lower limit for the timescale of its action to redistribute angular momentum in stellar interiors.</p>
Effects of Rotationally Induced Mixing in Compact Binary Systems with Low-mass Secondaries and in Single Solar-type Stars
<p>MESA inlists associated with <a href="https://ui.adsabs.harvard.edu/#abs/2012ApJ...755...95C/abstract">Chatzopoulos et al. (2012)</a>. MESA version 3647.</p> <p>Publication DOI: <a href="https://www.doi.org/10.1088/0004-637X/755/2/95">10.1088/0004-637X/755/2/95</a></p>
Database of Skyrme, RMF and Gogny Nuclear Interaction Parameters and Nuclear and Low-Mass Neutron Star Properties
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Allen Brain Atlas
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International Brain Laboratory public data
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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.