VLASS stellar radio sources and Gaia counterparts

In this work, we have carried out a systematic analysis of the Very Large Array Sky Survey (VLASS) quick look catalogs together with Gaia DR3 to identify the optical counterparts of 3GHz radio emitters within 500pc to obtain a homogeneous statistical sample of stellar radio sources. We have identified distinct populations of 3GHz emitters across the Gaia DR3 color-magnitude diagram. We also present candidate sources (transient, highly variable, or background artifacts) that can be confirmed by follow-up observations. A majority of the detected sources constitute main-sequence G-, K-, and M-type stars, including ultracool dwarfs. Pinning down the origin of radio emission from these populations can help us gain further insights into the origin of stellar and planetary magnetic fields. By analyzing the variation of brightness temperature of the sources with their spectral type, we have tentatively associated possible emission mechanisms with different object types. We inspected the correlation between quiescent radio and X-ray emission for our sample, which can provide crucial insights into the current understanding of the Gudel-Benz relationship, which is essential for modeling steady radio emission and coronal heating. This VLASS-Gaia DR3 analysis acts as a pilot study for follow-up observations at multiple wavelengths to better understand stellar structure, model flaring activities, and detect radio emission caused by star-planet interactions.

Cone search capability for table J/AJ/168/288/table1 (Very Large Array Survey, Gaia DR3 coordinates, and photometric information for radio sources analyzed in this study along with their classified category)

Identifier
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/AJ/168/288
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/168/288
Related Identifier https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/168/288
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/AJ/168/288
Provenance
Creator Ayanabha D.; Narang M.; Puravankara M.; Shridharan B.; Tyagi H.,Banerjee B.; Nayak P.K.; Surya A.
Publisher CDS
Publication Year 2025
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Cosmology; Interstellar medium; Natural Sciences; Observational Astronomy; Physics