Abstract
We report the detection of two superflares along with other eight relatively moderate flares in a close binary RS CVn-type system DV Psc using TESS data. The flare energies were found to be in the range of 0.24–23.97 × 1034 erg with a duration of a few minutes to an hour. Most of the flares were not during primary and secondary minima phases. The two superflares occurred at a phase of 0.1 and 0.55 and the stellar spot with a magnetic field B = 500-2000 G can explain the energetics. Since the period of the binary is increasing, we estimated the energy due to mass transfer and noted that accretion energy may provide energy for the flares. Based on the sample of flaring late-type star data, we noted that flares in DV Psc possibly may arrive from either of the stellar components as the correlation between Log E vs Log R does agree well with theoretical relation (E∝ R3). Based on the values of the rotation period for both stellar components, we conclude that DV Psc displays low flaring frequency for a fast rotator. The loop lengths were estimated to be around 3.65–4.55 × 1010 cm for superflare events which were ∼ three times less than the separation (1.40 × 1011 cm) between the stellar component but if both loops occur at a similar time, the loops may interact and can trigger the observed superflares. We conclude that a large stellar spot or interconnecting magnetic field of lines among binary companions may trigger the superflares.
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Acknowledgements
We thank the referee for the suggestions that improved the quality of the work. K.S. acknowledges the financial support from the SERB Core Research Grant project, the Government of India. Mamatha Rani acknowledges the support from the SRF INSPIRE (IF 170314) fellowship program, Government of India. The authors acknowledge also the TESS consortium for providing excellent observational data. Funding for the TESS mission is provided by NASAs Science Mission directorate. The data is publicly available from the Mikulski Archive for Space Telescopes.
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D.L and G.M have planned and wrote the paper. K.S has given insightful suggestions throughout the work and also helped to properly deliver the conclusion for the paper.
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Lahiri, D., Rani, G.M. & Sriram, K. A study of flare emission in DV Psc using TESS data. Astrophys Space Sci 368, 90 (2023). https://doi.org/10.1007/s10509-023-04243-w
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DOI: https://doi.org/10.1007/s10509-023-04243-w