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Start Over Subject brown-dwarfs Content Level Research
1. Discovery of Brown Dwarfs mining the 2MASS and SDSS databases
ID:
ivo://edu.euro-vo.org/extern/asterics_browndwarfs
Title:
Discovery of Brown Dwarfs mining the 2MASS and SDSS databases
Date:
27 Dec 2024 08:31:05
Publisher:
The GAVO DC team
Description:
Brown dwarfs are objects occupying the gap between the least massive stars and the most massive planets. They are intrinsically faint objects so their detection is not straighforward and, in fact, was almost impossible until the advent of global surveys at deep optical and near-infrared bands like SDSS, 2MASS or DENIS among others. We propose here to mine the 2MASS-PSC and SDSS-DR9 databases to identify T-type brown dwarfs through an appropriate combination of colours in the optical and the infra-red, an approach that perfectly fits into the Virtual Observatory.
2. Identifying Brown Dwarf candidates in 2MASS and SDSS
ID:
ivo://edu.gavo.org/hd/brown_dwarfs
Title:
Identifying Brown Dwarf candidates in 2MASS and SDSS
Date:
03 Apr 2025 09:45:51
Publisher:
The GAVO DC team
Description:
This tutorial is a comprehensive scientific usecase in which brown dwarf candidates in 2MASS and SDSS are identyfied. The surveys are queried using ADQL, and unncertainties in the data are solved with TOPCAT and Aladin.
3. The Fifth Catalogue of Nearby Stars (CNS5)
ID:
ivo://org.gavo.dc/cns5/q/cone
Title:
The Fifth Catalogue of Nearby Stars (CNS5)
Short Name:
CNS5
Date:
27 Dec 2024 08:31:04
Publisher:
The GAVO DC team
Description:
The Fifth Catalogue of Nearby Stars (CNS5) aims to provide the most volume-complete sample of stars in the solar neighbourhood. The CNS5 is compiled based on trigonometric parallaxes from Gaia EDR3 and Hipparcos, and supplemented with astrometric data from Spitzer and ground-based surveys carried out in the infrared. The CNS5 catalogue is statistically complete down to 19.7 mag in G-band and 11.8 mag in W1-band absolute magnitudes, corresponding to a spectral type of L8. Continuous updates of observational data for nearby stars from all sources were collected and evaluated. For all known stars in the 25 pc sphere around the Sun, the best values of positions in space, velocities, and magnitudes in different filters are presented.
4. Ultracool Dwarf Companion Catalogue UCDC
ID:
ivo://org.gavo.dc/ucdc/q/cone
Title:
Ultracool Dwarf Companion Catalogue UCDC
Short Name:
UCDC cone
Date:
27 Dec 2024 08:31:03
Publisher:
The GAVO DC team
Description:
The Ultracool Dwarf Companion Catalogue consists of 278 multiple systems, 32 of which are newly discovered, each with at least one spectroscopically confirmed Ultracool Dwarf, within a 100 pc volume-limited sample. This catalogue is compiled using the Gaia Catalogue of Nearby Stars for stellar primaries and the Gaia Ultracool Dwarf Sample for low-mass companions and includes 241 doubles, 33 triples, and 4 higher-order systems established from positional, proper motion, and parallax constraints.