Detection of radio emission from stars via proper-motion searches

Abstract

We present a method for identifying radio stellar sources using their proper-motion. We demonstrate this method using the FIRST, VLASS, RACS-low and RACS-mid radio surveys, and astrometric information from Gaia Data Release 3. We find eight stellar radio sources using this method, two of which have not previously been identified in the literature as radio stars. We determine that this method probes distances of ~90pc when we use FIRST and RACS-mid, and ~250pc when we use FIRST and VLASS. We investigate the time baselines required by current and future radio sky surveys to detect the eight sources we found, with the SKA (6.7 GHz) requiring <3 years between observations to find all eight sources. We also identify nine previously known and 43 candidate variable radio stellar sources that are detected in FIRST (1.4 GHz) but are not detected in RACS-mid (1.37 GHz). This shows that many stellar radio sources are variable, and that surveys with multiple epochs can detect a more complete sample of stellar radio sources.

arXiv comment20 pages, 6 figures, 6 tables, accepted for publication in PASA

References in corpus (19)

• Astropy: A Community Python Package for Astronomy
• LOFAR: The LOw-Frequency ARray
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• The VizieR database of Astronomical Catalogues
• The Expanded Very Large Array -- a New Telescope for New Science
• Stellar and substellar companions of nearby stars from Gaia DR2 - Binarity from proper motion anomaly
• The Last of FIRST: The Final Catalog and Source Identifications
• A Quick Look at the $3$GHz Radio Sky I. Source Statistics from the Very Large Array Sky Survey
• Optical Counterparts for 70,000 Radio Sources: APM Identifications for the FIRST Radio Survey
• Radio Interferometric Planet Search I: First Constraints on Planetary Companions for Nearby, Low-Mass Stars from Radio Astrometry
• An all-sky optical catalogue of radio / X-ray sources
• The Large Bright Quasar Survey VII. The LBQS and FIRST Surveys
• Rotation, activity, and lithium abundance in cool binary stars
• The Million Optical - Radio/X-ray Associations (MORX) Catalogue
• Coherent radio emission from a population of RS Canum Venaticorum systems
• A Sample of Candidate Radio Stars in FIRST and SDSS
• An astrometric planetary companion candidate to the M9 Dwarf TVLM 513-46546
• Peculiar radio$-$X-ray relationship in active stars
• The detection of radio emission from known X-ray flaring star EXO 040830-7134.7

Cited by in corpus (1)

• Searching for Radio Transients with Inverted Spectra in Epoch 1 of VLASS and VCSS, and Identification of a Sample of Candidate Relativistic Nuclear Transients