Demography of Stellar Radio Population within 500 pc: A VLASS-Gaia DR3 Study

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 3 GHz radio emitters within 500 pc to obtain a homogeneous statistical sample of stellar radio sources. We have identi...

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Bibliographic Details
Published in:The Astronomical journal 2024-12, Vol.168 (6), p.288
Main Authors: Ayanabha, D., Narang, Mayank, Puravankara, Manoj, Shridharan, B., Tyagi, H., Banerjee, Bihan, Nayak, Prasanta K., Surya, Arun
Format: Article
Language:English
Subjects:
Brightness temperature
Coronal heating
Demography
Emission analysis
Emissions
Emitters
Gaia
M stars
Magnetic fields
Optical counterparts (astronomy)
Planetary magnetic fields
Population (statistical)
Radio astronomy
Radio continuum emission
Radio emission
Radio source catalogs
Radio sources (astronomy)
Sky surveys (astronomy)
Statistical sampling
Stellar coronas
Stellar magnetic fields
Stellar models
Stellar properties
Stellar structure
Wavelengths
X-ray emissions
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Summary: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 3 GHz radio emitters within 500 pc to obtain a homogeneous statistical sample of stellar radio sources. We have identified distinct populations of 3 GHz 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.
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/ad84e7