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opencc-by-4.0Nov 2023View details →

Hunting Down White Dwarf--Main Sequence Binaries Using Multi-Wavelength Observations

Identification of white dwarfs (WD) with main-sequence (MS) companions and characterization of their properties can put important constraints on our understanding of binary stellar evolution and guide the theoretical predictions for a wide range of interesting transient events relevant for, e.g., Rubin Observatory (LSST), ZTF, and LISA. In this study, we combine ultraviolet (UV) and optical color-magnitude diagrams (CMDs) to identify unresolved WD--MS binaries. In particular, we combine high-precision astrometric and photometric data in the optical from \gaia\ -DR3 and UV data from GALEX GR6/7 to identify 93 WD--MS candidates within 100 pc. Of these, 80 are newly identified. Using the Virtual Observatory SED Analyzer (VOSA) we fit the spectral energy distributions (SEDs) of all our candidates and derive stellar parameters, such as effective temperature, bolometric luminosity, and radius for both companions. We find that our identification method helps identify hotter and smaller WD companions (majority with ≥ 10,000 K and ≤ 0.02 R_Sun) relative to the WDs identified by past surveys. We infer that these WDs are relatively more massive (median ~0.76 M_Sun). We find that most of the MS companions in our binaries are of the K and M spectral types.

opencc-by-4.0Mar 2024View details →

Data from: De Novo Genome assembly of the Caucasian dwarf goby Knipowitschia cf. caucasica, a new alien Gobiidae invading the River Rhine

Background (Abstract from Paper) The Caucasian dwarf goby Knipowitschia cf. caucasica is a new invasive alien Gobiidae spreading in the Lower Rhine since 2019. Little is known about the invasion biology of the species and further investiga- tions to reconstruct the invasion history are lacking genomic resources. We assembled a high-quality chromosome-scale reference genome of Knipowitschia cf. caucasica by combining PacBio, Omni-C and Illumina technologies. The size of the assembled genome is 956.58 Mb with a N50 scaffold length of 43 Mb, which includes 92.3 % complete vertebrate/Actinopterygii Benchmarking Universal Single-Copy Orthologs. 98.96 % of the assembly sequence was assigned to 23 chromosome-level scaffolds, with a GC-content of 42.83 %. Repetitive elements account for 53.08 % of the genome. The chromosome-level genome contained 49,622 transcripts with 42,926 multi-exons, of which 45,512 genes were functionally annotated. In summary, the high-quality genome assembly provides a fundamental basis to understand the adaptive advantage of the species. The file provided here is the non-redundant repeat library (2,812 consensus sequences of repeat families).  Method: Repetitive elements were identified de novo with RepeatModeler version 2.0.1. Repetitive DNA and soft-masking was performed with RepeatMasker version 4.1.1 (Smit et al., 2013) using the repeat library previously identified via RepeatModeler and skipping the bacterial insertion element check (-no_is) and run with rmblastn version 2.10.0+ (Flynn et al., 2020).

Population of White Dwarfs - undersampled x1000

As generated by StellarMortis.

FIGURE 1 in A new species of African diurnal dwarf geckos (Gekkonidae: Lygodactylus) from the Lower Guinea rainforest

FIGURE 1: Habitats and geographical distribution of Lygodactylus lobeke sp. nov. on a hybrid map of the major vegetation divisions (Sayre et al. 2013) and 1 arc-second elevation map across tropical Africa (NASA 2000). Photos of habitats from (a) type locality (holotype) near Goumela, southeastern Cameroon, and (b) second locality (paratype) near Sanga Wanda, Mayombe National Park, Cabinda Province, Angola. Photographs by B.R. (a) and J.L-R. (b).

FIGURE 4 in A new species of African diurnal dwarf geckos (Gekkonidae: Lygodactylus) from the Lower Guinea rainforest

FIGURE 4: Lygodactylus lobeke sp. nov. type material in preservative. a) to d) female holotype (ZSM 56/2024): a) dorsal and b) ventral views; c) dorsal view of head, d) ventral view of (regenerated) tail tip. e) to h) male paratype (FKH 1259): e) dorsal and f) ventral views; g) dorsal view of head, h) ventral view of (regenerated) tail tip. Photographs by B.R. (a–d) and P. VP. (e–h).

FIGURE 3 in A new species of African diurnal dwarf geckos (Gekkonidae: Lygodactylus) from the Lower Guinea rainforest

FIGURE 3: Lygodactylus lobeke sp. nov. in life. (a) Chin and (c) precloacal region and proximal part of the tail of the female holotype. Precloacal region with 9 precloacal spots, corresponding to the precloacal pores in the male specimen. Arrowheads in (c) mark row of precloacal scales with spots. Original part of tail with double row of enlarged subcaudal scales, two of which are marked with circles. Inset: same, contrast enhanced. (b) Chin and (d) precloacal region and pseudo-escutcheon (yellow scales) of the male paratype. Precloacal region with 9 precloacal pores. Arrowheads in (d) mark row of precloacal pores. Photographs by B.R. (a, c) and P.VP. (b, d).

FIGURE 6 in A new species of African diurnal dwarf geckos (Gekkonidae: Lygodactylus) from the Lower Guinea rainforest

FIGURE 6: Lygodactylus lobeke sp. nov. female holotype in life: 'Mood dependent' colorations. (a) and (b) 'distress' coloration (compare coloration shortly after capture, see Fig. 2a); (c) 'neutral' coloration; (d) 'display' coloration; (e) 'pyjamas' coloration (resting at night on a leaf). Photographs by B.R.

FIGURE 2 in A new species of African diurnal dwarf geckos (Gekkonidae: Lygodactylus) from the Lower Guinea rainforest

FIGURE 2: Lygodactylus lobeke sp. nov. in life, shortly after capture. Female holotype: lateral (a) and dorsal views (b). Male paratype: lateral (c) and dorsal views (d). Photographs of holotype: ambient light, analog (Kodachrome 200) (2002), photographs of paratype: flash, digital (Canon EOS 6D Mark II) (2023). Photographs by B.R. (a, b) and P.VP. (c, d).

FIGURE 5 in A new species of African diurnal dwarf geckos (Gekkonidae: Lygodactylus) from the Lower Guinea rainforest

FIGURE 5: Phylogenetic relationships of Lygodactylus lobeke sp. nov. (Left) Maximum likelihood tree based on partitioned multigene analysis constructed with iQtree, including information from Gippner et al. (2021), plus all available samples of the L. scheffleri group, with collapsed groups defined by Gippner et al. (2021). (Right) Detailed phylogenetic placement of Lygodactylus lobeke sp. nov. within the L. scheffleri group. Support values are shown above (PP = Bayesian Inference posterior probabilities) and below (BS = Maximum Likelihood bootstrap values) the nodes.

Table A.11: M dwarfs + Planets

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Table A.10: M dwarfs + Ultracool dwarfs

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Table A.9: M dwarfs + White dwarfs

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Table A.8: M dwarfs + FGK stars

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opencc-by-4.0May 2022View details →

Catalogue of stars in Milky Way Dwarf Spheroidal Galaxies from Gaia EDR3

Pace, Erkal, and Li 2022.  Summary Table (including fits, csv, and npy file formats) (1) Catalogs (2) Diagnostic Plot Figures (3) Comparison Plot Figures v2 changes: <ul> <li>The input velocity of Tucana V had the incorrect sign and has been corrected.  All orbit models and values that depended on the velocity have been updated. </li> <li>the column "rhalf_sph_physical_mcmc_error" had the same values for each galaxy.</li> <li>The error columns (ep/em) for the following columns have been updated: average_density, m_l, mhalf, density_ratio. The errors are now the difference between the 16/84 confidence interval and the 50 confidence interval which follows the format of the rest of the summary file. </li> </ul> v3 changes: <ul> <li>The correlation errors between pmra, pmdec where incorrectly computed (named edr3_pmra_pmdec_error and  edr3_gauss_pmra_pmdec_error in the catalogs here) and have been fixed. Only the summary files have been updated. </li> </ul>

opencc-by-4.0Oct 2021View details →

The Demographics of Giant Exoplanets and Brown Dwarfs in Wide Stellar Binaries

While numerous exoplanets have now been uncovered in stellar binaries, the impact of companion stars on planet formation and evolution is still not understood. In this talk, I will present results of population trends seen among the known sample of planets in wide multiple star systems, which allows us to investigate the effects of stellar binarity on the resulting planetary architectures. In particular, observations of stars hosting close-in giant planets and brown dwarfs find an excess of binary companions on few hundred AU separations, and different planet demographics for these systems, suggesting that such binaries may provide favourable conditions for the formation of the observed inner companions. I will show results from simulations of self-gravitating protoplanetary disks adapted to binary-star environments, which show that certain binary configurations may trigger gravitational fragmentation and lead to the formation of giant planets in otherwise-stable disks.

opencc-zeroNov 2021View details →

Applying the metallicity-dependent binary fraction to double white dwarf formation, Implications for LISA, results

This dataset contains data created by post-processing pipeline to produce the figures from Thiele+2021 Created using <a href="https://github.com/rodluger/showyourwork">showyourwork</a> from <a href="https://github.com/katiebreivik/hush/tree/ae41b3fbc87d9ef411fec9fd464958c6ab367a2e">this GitHub repo</a> using the following command: <pre><code class="language-bash">cd src/figures && python src/figures/pipeline.py</code></pre>

opennotspecifiedDec 2010View details →

Figure 1 in Morphometrics confirm taxonomic deflation in dwarf lemurs (Primates: Cheirogaleidae), as suggested by genetics

Figure 1. Sampling localities. Sampling sites of both the field samples and the museum specimens included in the analyses of this study are marked with circles. The colours indicate that individuals found at the respective site were classified as Cheirogaleus medius (yellow), Cheirogaleus major (red), and Cheirogaleus crossleyi (blue), or could not be clearly classified (white) by the analyses presented in this study. The Sambava locality is marked by two circles, as two different species were collected at this site. The asterisks denote sites that were newly sampled for this study.

dryad32/100

A new remarkable dwarf sedge (Carex phylloscirpoid, Cyperaceae) from Northern Chile, with insights on the evolution of Austral section Racemosae

We describe a new remarkable dwarf and apparently acaulescent species of Carex (Cyperaceae) from the Andes of northern Chile: Carex phylloscirpoides. Morphological and molecular data (two nuclear and three plastid DNA regions) were used to study the phylogenetic placement and systematic relationships of this species, which resulted in its assignment to section Racemosae. However, despite being related to the other three species of the section present in the Southern Cone based on phylogenetic evidence, it displays a number of unusual morphological features. In addition, it is geographically disjunct and genetically differentiated from them. A conservation assessment was performed which resulted in the proposal of the Critically Endangered category at the global level under IUCN guidelines. We discuss the biogeographic and ecological peculiarities of the new species and its allies, with emphasis in the high number of acaulescent sedges present in South America. The features of C. phylloscirpoides emphasize its unique evolutionary position and its rarity highlights its conservation importance, especially in the context of the South American Andean flora.

opencc-zeroDec 2021View details →

opencc-by-4.0Jan 2022View details →

Birth cluster simulations of planetary systems with multiple super-Earths: initial conditions for white dwarf pollution drivers

We provide the output parameters from our planetary system simulations around white dwarf main-sequence progenitors (1.5, 2.0 and 2.5 solar mass stars) embedded in a birth star cluster containing 8,000 stars. The data can serve the community as initial conditions for subsequent evolution simulations, e.g. to further investigate the role of eccentric planets in the pollution of white dwarfs. The planetary systems, consisting solely of super-Earths with 0.01 Jovian masses, were started in three different orbital configurations. The 3P model contains 3 planets with initial semimajor axes between 2.00 and 18.63 AU. We also simulated two 7-planet system models with different orbital spacing. The 7PC model represents a compact planetary system with 7 planets between 2.00 and 18.63 AU. The 7PW model represents a wide planetary system with 7 planets between 2.00 and 56.87 AU. The three planetary system models were distributed around 193 stars with 1.5 solar masses, around 114 stars with 2.0 solar masses and around 101 stars with 2.5 solar masses, and numerically integrated for 100 Myr considering the gravitational forces from the neighbouring stars in the star cluster. See the publication Stock et al. (2022) for further information.