We present the discovery of 118 new ultracool dwarf candidates, discovered using a new machine learning tool, named SMDET, applied to time series images from the Wide-field Infrared Survey Explorer.
astro-ph.SR
Posted inAstrochemistry, Astrogeology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Press Release
On The Age And Metallicity Of Planet-hosting Triple Star Systems
We present a statistical analysis of the ages and metallicities of triple stellar systems that are known to host exoplanets. With controversial cases disregarded, so far 27 of those systems […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Five New Eclipsing Binaries With Low-mass Companions
Precise space-based photometry from the Transiting Exoplanet Survey Satellite results in a huge number of exoplanetary candidates. However, the masses of these objects are unknown and must be determined by […]
Posted inAstrogeology, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Status Report
Early Planet Formation in Embedded Disks (eDisk) XVI: An Asymmetric Dust Disk Driving a Multi-component Molecular Outflow in the Young Class 0 Protostar GSS30 IRS3
We present the results of the ALMA Large Program Early Planet Formation in Embedded disks observations of the Class 0 protostar GSS30 IRS3. Our observations included 1.3 mm continuum with […]
Posted inAstropharmacy / Biotechnology, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Detailed Abundances of the Planet-hosting TOI-1173 A/B system: Possible Evidence of Planet Engulfment in a Very Wide Binary
Over the last decade, studies of large samples of binary systems identified chemical anomalies, and showed that they might be attributed to planet formation or planet engulfment. However, both scenarios […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Status Report, Stellar Cartography
Multiplicity Of Stars With Planets In The Solar Neighbourhood
Aims: We intended to quantify the impact of stellar multiplicity on the presence and properties of exoplanets.
![LEFT: M dwarf abundance distributions for Mg and Si separated according to the kinematic membership of stars in the thick disc (TD), thick disc-thin disc transition (TD-D), thin disc (D), and young disc (YD), following the criteria of Montes et al. (2018) (see text for details). Mean values for each population are indicated by vertical lines. RIGHT: Top panel: [Si/Fe] vs. firon. The target stars are in orange while the black points correspond to the firon values computed from the Adibekyan et al. (2012) abundances. The fit through the M dwarf values is denoted with a blue line. Bottom panel: Histogram for the firon values of our sample. -- astro-ph.SR](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/07/The-CARMENES-Search-For-Exoplanets-AroundM.png?resize=1200%2C716&ssl=1)
Posted inAstrochemistry, Astrogeology, Astronomy & Telescopes, Imaging & Spectroscopy, Status Report
The CARMENES Search For Exoplanets Around M Dwarfs: Magnesium And Silicon Abundances Of K7-M5.5 Stars
We present the abundances of magnesium (Mg) and silicon (Si) for 314 dwarf stars with spectral types in the interval K7.0-M5.5 (Teff range ~4200-3050 K) observed with the CARMENES high-resolution […]
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Interstellar, Status Report
Formation of S-bearing Complex Organic Molecules In Interstellar Clouds Via Ice Reactions With C2H2, HS, And Atomic H
The chemical network governing interstellar sulfur has been the topic of unrelenting discussion for the past decades due to the conspicuous discrepancy between its expected and observed abundances in different […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Magnetic Fields, Electromagnetism, bioelectricity,, Status Report, Stellar Cartography
Magnetic Fields of M Dwarfs from the Pleiades Open Cluster
Average magnetic field measurements are presented for 62 M-dwarf members of the Pleiades open cluster, derived from Zeeman-enhanced Fe I lines in the H-band. An MCMC methodology was employed to […]
![The [Mg/Si]-[C/O] diagram for the M dwarf sample (overlying orange dots) and GK dwarf sample (underlying colourful dots in density). An ODR fit is applied to the M dwarf sample, with the best fit shown in the solid line and 1σ and 2σ error intervals shown in dash and dot lines (in brown), respectively. The regression parameters are also shown on the plot. A Student’s t-test is also applied to test the significance of the slope different from zero, and the resultant p-value is less than 0.001. -- astro-ph.SR](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/07/Towards-Characterising-Rocky-Worlds.png?resize=1200%2C720&ssl=1)
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Icy Worlds, Status Report, Water/Hycean Worlds & Oceanography
Towards Characterising Rocky Worlds: Trends In Chemical Make-ups Of M dwarfs Versus GK dwarfs
Elemental abundances of Sun-like stars are crucial for understanding the detailed properties of their planets. However, measuring elemental abundances in M stars is challenging due to their faintness and pervasive […]