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Searching for outbursts from Symbiotic Binaries in GOTO and ATLAS data

G. Ramsay, K. Ackley, S. Belkin, P. Chote, D. Coppejans, M. J. Dyer, R. Eyles-Ferris, B. Godson, D. Jarvis, Y. Julakanti, L. Kelsey, M. R. Kennedy, T. L. Killestein, A. Kumar, A. Levan, S. Littlefair, J. Lyman, M. Magee, S. Mandhai, D. Mata Sánchez, S. Mattila, J. McCormac, J. Mullaney, D. O'Neill, C. Phillips, K. Pu, M. Pursiainen, A. Sahu, S. Moran, M. Shrestha, E. Stanway, R. Starling, Y. Sun, K. Ulaczyk, L. Vincetti, B. Warwick, E. Wickens, K. Wiersema, D. Steeghs, D. K. Galloway, V. S. Dhillon, P. O'Brien, K. Noysena, R. Kotak, R. P. Breton, L. K. Nuttall, B. Gompertz, J. Casares, D. Pollacco

Abstract

Symbiotic Binaries contain a white dwarf accreting material from a red giant star through a wind. We present the results of a search for outbursts from Symbiotic Binaries using photometric data obtained using the GOTO all-sky survey taken from 2023 onwards. After identifying ten candidate outbursting systems, we used ATLAS photometry to characterise their photometric behaviour before 2023, leaving five systems which showed photometric behaviour consistent with an outburst. The ATLAS data showed how important the photometric history of an object is in determining whether a photometric feature is a likely outburst event. The outburst from LMC N67 is the first reported Z And-type outburst from a Symbiotic binary in the LMC. OGLE SMC-LPV-4044 and HK Sco show previously unreported outbursts. QW Sge and V4141 Sgr show outbursts starting in 2024, which have already been reported and are ongoing. By better identifying and characterising Z And-type outbursts from many systems, it will be possible to better understand the physics of these events, which are still not fully understood.

Searching for outbursts from Symbiotic Binaries in GOTO and ATLAS data

Abstract

Symbiotic Binaries contain a white dwarf accreting material from a red giant star through a wind. We present the results of a search for outbursts from Symbiotic Binaries using photometric data obtained using the GOTO all-sky survey taken from 2023 onwards. After identifying ten candidate outbursting systems, we used ATLAS photometry to characterise their photometric behaviour before 2023, leaving five systems which showed photometric behaviour consistent with an outburst. The ATLAS data showed how important the photometric history of an object is in determining whether a photometric feature is a likely outburst event. The outburst from LMC N67 is the first reported Z And-type outburst from a Symbiotic binary in the LMC. OGLE SMC-LPV-4044 and HK Sco show previously unreported outbursts. QW Sge and V4141 Sgr show outbursts starting in 2024, which have already been reported and are ongoing. By better identifying and characterising Z And-type outbursts from many systems, it will be possible to better understand the physics of these events, which are still not fully understood.
Paper Structure (9 sections, 2 figures, 1 table)

This paper contains 9 sections, 2 figures, 1 table.

Table of Contents

  1. Introduction
  2. Observations
  3. Results
  4. LHA 120-N 67
  5. OGLE SMC-LPV-4044
  6. HK Sco
  7. QW Sge
  8. V4141 Sgr
  9. Discussion and Conclusions

Figures (2)

  • Figure 1: The GOTO (green points), ATLAS cyan (blue) and ATLAS (orange) photometry of V407 Cyg. It shows a high amplitude quasi-periodicity on a period of $\sim$750 d. The scatter in the o-band photometry is likely due to the source being near saturated.
  • Figure 2: The GOTO L-band (green points); ATLAS c-band (blue) and ATLAS o-band (orange) points of the SBs which showed likely outbursts in GOTO data.