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Detection of Millimeter-Wavelength Flares from Two Accreting White Dwarf Systems in the SPT-3G Galactic Plane Survey

Fuente: arXiv

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Main Authors:	Wan, Y., Vieira, J. D., Chichura, P. M., Maccarone, T. J., Anderson, A. J., Ansarinejad, B., Anumarlapudi, A., Archipley, M., Balkenhol, L., Barry, P. S., Benabed, K., Bender, A. N., Benson, B. A., Bianchini, F., Bleem, L. E., Bouchet, F. R., Bryant, L., Camphuis, E., Campitiello, M. G., Carlstrom, J. E., Chang, C. L., Chaubal, P., Chokshi, A., Chou, T. -L., Coerver, A., Crawford, T. M., Daley, C., de Haan, T., Dibert, K. R., Dobbs, M. A., Doohan, M., Doussot, A., Dutcher, D., Everett, W., Feng, C., Ferguson, K. R., Fichman, K., Foster, A., Galli, S., Gambrel, A. E., Gardner, R. W., Ge, F., Goeckner-Wald, N., Gualtieri, R., Guidi, F., Guns, S., Halverson, N. W., Hivon, E., Holder, G. P., Holzapfel, W. L., Hood, J. C., Hryciuk, A., Huang, N., Kaplan, D. L., Keruzore, F., Khalife, A. R., Knox, L., Korman, M., Kornoelje, K., Kuo, C. -L., Levy, K., Lowitz, A. E., Lu, C., Lynch, G. P., Maniyar, A., Martsen, E. S., Menanteau, F., Millea, M., Montgomery, J., Nakato, Y., Natoli, T., Noble, G. I., Omori, Y., Ouellette, A., Pan, Z., Paschos, P., Phadke, K. A., Pollak, A. W., Prabhu, K., Quan, W., Rahimi, M., Rahlin, A., Reichardt, C. L., Rouble, M., Ruhl, J. E., Schiappucci, E., Simpson, A., Sobrin, J. A., Stark, A. A., Stephen, J., Tandoi, C., Thorne, B., Trendafilova, C., Umilta, C., Vitrier, A., Whitehorn, N., Wu, W. L. K., Young, M. R., Zebrowski, J. A.
Format:	Preprint
Published:	2025
Subjects:	Solar and Stellar Astrophysics Astrophysics of Galaxies
Online Access:	Acceder al recurso
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author	Wan, Y. Vieira, J. D. Chichura, P. M. Maccarone, T. J. Anderson, A. J. Ansarinejad, B. Anumarlapudi, A. Archipley, M. Balkenhol, L. Barry, P. S. Benabed, K. Bender, A. N. Benson, B. A. Bianchini, F. Bleem, L. E. Bouchet, F. R. Bryant, L. Camphuis, E. Campitiello, M. G. Carlstrom, J. E. Chang, C. L. Chaubal, P. Chokshi, A. Chou, T. -L. Coerver, A. Crawford, T. M. Daley, C. de Haan, T. Dibert, K. R. Dobbs, M. A. Doohan, M. Doussot, A. Dutcher, D. Everett, W. Feng, C. Ferguson, K. R. Fichman, K. Foster, A. Galli, S. Gambrel, A. E. Gardner, R. W. Ge, F. Goeckner-Wald, N. Gualtieri, R. Guidi, F. Guns, S. Halverson, N. W. Hivon, E. Holder, G. P. Holzapfel, W. L. Hood, J. C. Hryciuk, A. Huang, N. Kaplan, D. L. Keruzore, F. Khalife, A. R. Knox, L. Korman, M. Kornoelje, K. Kuo, C. -L. Levy, K. Lowitz, A. E. Lu, C. Lynch, G. P. Maniyar, A. Martsen, E. S. Menanteau, F. Millea, M. Montgomery, J. Nakato, Y. Natoli, T. Noble, G. I. Omori, Y. Ouellette, A. Pan, Z. Paschos, P. Phadke, K. A. Pollak, A. W. Prabhu, K. Quan, W. Rahimi, M. Rahlin, A. Reichardt, C. L. Rouble, M. Ruhl, J. E. Schiappucci, E. Simpson, A. Sobrin, J. A. Stark, A. A. Stephen, J. Tandoi, C. Thorne, B. Trendafilova, C. Umilta, C. Vitrier, A. Whitehorn, N. Wu, W. L. K. Young, M. R. Zebrowski, J. A.
author_facet	Wan, Y. Vieira, J. D. Chichura, P. M. Maccarone, T. J. Anderson, A. J. Ansarinejad, B. Anumarlapudi, A. Archipley, M. Balkenhol, L. Barry, P. S. Benabed, K. Bender, A. N. Benson, B. A. Bianchini, F. Bleem, L. E. Bouchet, F. R. Bryant, L. Camphuis, E. Campitiello, M. G. Carlstrom, J. E. Chang, C. L. Chaubal, P. Chokshi, A. Chou, T. -L. Coerver, A. Crawford, T. M. Daley, C. de Haan, T. Dibert, K. R. Dobbs, M. A. Doohan, M. Doussot, A. Dutcher, D. Everett, W. Feng, C. Ferguson, K. R. Fichman, K. Foster, A. Galli, S. Gambrel, A. E. Gardner, R. W. Ge, F. Goeckner-Wald, N. Gualtieri, R. Guidi, F. Guns, S. Halverson, N. W. Hivon, E. Holder, G. P. Holzapfel, W. L. Hood, J. C. Hryciuk, A. Huang, N. Kaplan, D. L. Keruzore, F. Khalife, A. R. Knox, L. Korman, M. Kornoelje, K. Kuo, C. -L. Levy, K. Lowitz, A. E. Lu, C. Lynch, G. P. Maniyar, A. Martsen, E. S. Menanteau, F. Millea, M. Montgomery, J. Nakato, Y. Natoli, T. Noble, G. I. Omori, Y. Ouellette, A. Pan, Z. Paschos, P. Phadke, K. A. Pollak, A. W. Prabhu, K. Quan, W. Rahimi, M. Rahlin, A. Reichardt, C. L. Rouble, M. Ruhl, J. E. Schiappucci, E. Simpson, A. Sobrin, J. A. Stark, A. A. Stephen, J. Tandoi, C. Thorne, B. Trendafilova, C. Umilta, C. Vitrier, A. Whitehorn, N. Wu, W. L. K. Young, M. R. Zebrowski, J. A.
contents	Blind discoveries of millimeter-wave (mm-wave) transient events in non-targeted surveys, as opposed to follow-up or pointed observations, have only become possible in the past decade using cosmic microwave background surveys. Here we present the first results from the SPT-3G Galactic Plane Survey -- the first dedicated high-sensitivity, wide-field, time-domain, mm-wave survey of the Galactic Plane, conducted with the South Pole Telescope (SPT) using the SPT-3G camera. The survey field covers approximately 100 $\text{deg}^2$ near the Galactic center. In 2023 and 2024, this survey consists of roughly 1,500 individual 20-minute observations in three bands centered at 95, 150, and 220 GHz, with plans for more observations in the coming years. We report the detection of two transient events exceeding a 5$σ$ threshold in both the 95 and 150 GHz bands in the first two years of SPT-3G Galactic Plane Survey data. Both events are unpolarized and exhibit durations of approximately one day, with peak flux densities at 150 GHz of at least 50 mJy. The peak isotropic luminosities at 150 GHz are on the order of $10^{31}~\text{erg}~\text{s}^{-1}$. Both events are associated with previously identified accreting white dwarfs. Magnetic reconnection in the accretion disk is a likely explanation for the observed millimeter flares. In the future, we plan to expand the transient search in the Galactic Plane by lowering the detection threshold, enabling single-band detections, analyzing lightcurves on a range of timescales, and including additional data from future observations.
format	Preprint
id	arxiv_https___arxiv_org_abs_2509_08962
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Detection of Millimeter-Wavelength Flares from Two Accreting White Dwarf Systems in the SPT-3G Galactic Plane Survey Wan, Y. Vieira, J. D. Chichura, P. M. Maccarone, T. J. Anderson, A. J. Ansarinejad, B. Anumarlapudi, A. Archipley, M. Balkenhol, L. Barry, P. S. Benabed, K. Bender, A. N. Benson, B. A. Bianchini, F. Bleem, L. E. Bouchet, F. R. Bryant, L. Camphuis, E. Campitiello, M. G. Carlstrom, J. E. Chang, C. L. Chaubal, P. Chokshi, A. Chou, T. -L. Coerver, A. Crawford, T. M. Daley, C. de Haan, T. Dibert, K. R. Dobbs, M. A. Doohan, M. Doussot, A. Dutcher, D. Everett, W. Feng, C. Ferguson, K. R. Fichman, K. Foster, A. Galli, S. Gambrel, A. E. Gardner, R. W. Ge, F. Goeckner-Wald, N. Gualtieri, R. Guidi, F. Guns, S. Halverson, N. W. Hivon, E. Holder, G. P. Holzapfel, W. L. Hood, J. C. Hryciuk, A. Huang, N. Kaplan, D. L. Keruzore, F. Khalife, A. R. Knox, L. Korman, M. Kornoelje, K. Kuo, C. -L. Levy, K. Lowitz, A. E. Lu, C. Lynch, G. P. Maniyar, A. Martsen, E. S. Menanteau, F. Millea, M. Montgomery, J. Nakato, Y. Natoli, T. Noble, G. I. Omori, Y. Ouellette, A. Pan, Z. Paschos, P. Phadke, K. A. Pollak, A. W. Prabhu, K. Quan, W. Rahimi, M. Rahlin, A. Reichardt, C. L. Rouble, M. Ruhl, J. E. Schiappucci, E. Simpson, A. Sobrin, J. A. Stark, A. A. Stephen, J. Tandoi, C. Thorne, B. Trendafilova, C. Umilta, C. Vitrier, A. Whitehorn, N. Wu, W. L. K. Young, M. R. Zebrowski, J. A. Solar and Stellar Astrophysics Astrophysics of Galaxies Blind discoveries of millimeter-wave (mm-wave) transient events in non-targeted surveys, as opposed to follow-up or pointed observations, have only become possible in the past decade using cosmic microwave background surveys. Here we present the first results from the SPT-3G Galactic Plane Survey -- the first dedicated high-sensitivity, wide-field, time-domain, mm-wave survey of the Galactic Plane, conducted with the South Pole Telescope (SPT) using the SPT-3G camera. The survey field covers approximately 100 $\text{deg}^2$ near the Galactic center. In 2023 and 2024, this survey consists of roughly 1,500 individual 20-minute observations in three bands centered at 95, 150, and 220 GHz, with plans for more observations in the coming years. We report the detection of two transient events exceeding a 5$σ$ threshold in both the 95 and 150 GHz bands in the first two years of SPT-3G Galactic Plane Survey data. Both events are unpolarized and exhibit durations of approximately one day, with peak flux densities at 150 GHz of at least 50 mJy. The peak isotropic luminosities at 150 GHz are on the order of $10^{31}~\text{erg}~\text{s}^{-1}$. Both events are associated with previously identified accreting white dwarfs. Magnetic reconnection in the accretion disk is a likely explanation for the observed millimeter flares. In the future, we plan to expand the transient search in the Galactic Plane by lowering the detection threshold, enabling single-band detections, analyzing lightcurves on a range of timescales, and including additional data from future observations.
title	Detection of Millimeter-Wavelength Flares from Two Accreting White Dwarf Systems in the SPT-3G Galactic Plane Survey
topic	Solar and Stellar Astrophysics Astrophysics of Galaxies
url	https://arxiv.org/abs/2509.08962