Systematic Search for Cataclysmic Variables in Radio Surveys: First Radio Detection of IX Velorum
Abstract
We present a systematic search for radio emission from cataclysmic variables (CVs) across four wide-field radio surveys in the 0.7-4 GHz frequency range: VLASS; RACS; VAST; and EMU. We generated a reliable catalog of 2225 optically-identified CV candidates using a multi-stage cross-match, combined with systematic and manual verification; 1374 are matched to Gaia sources within the radio surveys' footprints. Among these, we detected six CVs in at least one epoch (at 1e16.5-1e17.5 erg/s/Hz, consistent with the typical population of radio-detected CVs); five had been detected in radio before. IX Vel, the closest nova-like CV, is detected in radio for the first time and shows quasi-persistent low-level emission across a 10 hr EMU (943.5 MHz) observation. Given most epochs detected no CV, we stacked images without radio detections to better constrain time-averaged brightnesses. We created co-added images and placed upper limits on low-level radio emission from each of the 423 individual CVs within the VAST footprint. To constrain the median brightness for the entire CV population, we combined all Gaia-matched CVs in each survey into single population-wide stacked images, detecting no statistically significant emission. Finally, we created population-wide image stacks of the CVs within 100 pc, using 14 epochs from 5 CVs in EMU to constrain their median persistent specific luminosity to <3e14 erg/s/Hz.
Related
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BibTeX
@misc{rao2026systematic,
title = {{Systematic Search for Cataclysmic Variables in Radio Surveys: First Radio Detection of IX Velorum}},
author = {Suhasini S. Rao and Gregory R. Sivakoff and Craig O. Heinke and Akash Anumarlapudi and Laura Driessen and David L. Kaplan Patrick A. Woudt},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.07448},
eprint = {2611.07448},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.07448},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Systematic Search for Cataclysmic Variables in Radio Surveys: First Radio Detection of IX Velorum
AU - Suhasini S. Rao
AU - Gregory R. Sivakoff
AU - Craig O. Heinke
AU - Akash Anumarlapudi
AU - Laura Driessen
AU - David L. Kaplan Patrick A. Woudt
PY - 2026
DA - 2026/11/05
PB - arXiv
DO - 10.48550/arxiv.2611.07448
UR - https://arxiv.org/abs/2611.07448
AB - We present a systematic search for radio emission from cataclysmic variables (CVs) across four wide-field radio surveys in the 0.7-4 GHz frequency range: VLASS; RACS; VAST; and EMU. We generated a reliable catalog of 2225 optically-identified CV candidates using a multi-stage cross-match, combined with systematic and manual verification; 1374 are matched to Gaia sources within the radio surveys' footprints. Among these, we detected six CVs in at least one epoch (at 1e16.5-1e17.5 erg/s/Hz, consistent with the typical population of radio-detected CVs); five had been detected in radio before. IX Vel, the closest nova-like CV, is detected in radio for the first time and shows quasi-persistent low-level emission across a 10 hr EMU (943.5 MHz) observation. Given most epochs detected no CV, we stacked images without radio detections to better constrain time-averaged brightnesses. We created co-added images and placed upper limits on low-level radio emission from each of the 423 individual CVs within the VAST footprint. To constrain the median brightness for the entire CV population, we combined all Gaia-matched CVs in each survey into single population-wide stacked images, detecting no statistically significant emission. Finally, we created population-wide image stacks of the CVs within 100 pc, using 14 epochs from 5 CVs in EMU to constrain their median persistent specific luminosity to <3e14 erg/s/Hz.
ER -