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2024

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Title: Detailed cool star flare morphology with CHEOPS and TESS
Authors: G. BRUNO, I. PAGANO, G. SCANDARIATO, H.-G. FLOREN, A. BRANDEKER, G. OLOFSSON, P. F. L. MAXTED, A. FORTIER, S. G. SOUSA, S. SULIS, V. VAN GROOTEL, Z. GARAI, A. BOLDOG, L. KRISKOVICS, GY. M. SZABO, D. GANDOLFI, Y. ALIBERT, R. ALONSO, T. BARCZY, D. BARRADO Y NAVASCUES, S. C. C. BARROS, W. BAUMJOHANN, M. BECK, T. BECK, W. BENZ, N. BILLOT, L. BORSATO, C. BROEG, A. COLLIER CAMERON, SZ. CSIZMADIA, P. E. CUBILLOS, M. B. DAVIES, M. DELEUIL, A. DELINE, L. DELREZ, O. D. S. DEMANGEON, B.-O. DEMORY, D. EHRENREICH, A. ERIKSON, J. FARINATO, L. FOSSATI, M. FRIDLUND, M. GILLON, M. GUEDEL, M. N. GUNTHER, A. HEITZMANN, CH. HELLING, S. HOYER, K. G. ISAAK, L. L. KISS, K. W. F. LAM, J. LASKAR, A. LECAVELIER DES ETANGS, M. LENDL, D. MAGRIN, C. MORDASINI, V. NASCIMBENI, R. OTTENSAMER, E. PALLE, G. PETER, G. PIOTTO, D. POLLACCO, D. QUELOZ, R. RAGAZZONI, N. RANDO, F. RATTI, H. RAUER, I. RIBAS, N. C. SANTOS, M. SARAJLIC, D. SEGRANSAN, A. E. SIMON, V. SINGH, A. M. S. SMITH, M. STALPORT, N. THOMAS, S. UDRY, B. ULMER, J. VENTURINI, E. VILLAVER, N. WALTON, T. G. WILSON
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Description: White-light stellar flares are crucial for estimating high-energy irradiation of exoplanet atmospheres, especially in the habitable zone. Using high-cadence data from CHEOPS and TESS, we studied the morphology of white-light flares in a sample of 130 stars, comparing high- and low-cadence results. Our algorithm separated complex flares to compare them with simple flares and examined amplitudes and periodicities in quasi-periodic pulsation candidates (QPP). Complex flares accounted for a significant part (about 30%) of events, with high-impulse flares more common than low-cadence data suggested. Simple and complex flares differed in duration but not in peak luminosity. Statistical analyses hinted at log-normal rather than power-law distributions for flare parameters, supporting diverse formation scenarios. QPP findings were consistent with prior studies, revealing a possible pre-flare dip.
Reference: Astronomy & Astrophysics, Vol. 686, A239, 27 pp.