Papers

FEATURED PAPERS

Symbiotic Stars in the Era of Modern Ground- and Space-Based Surveys
(Review)

Merc, J. (2025).
Galaxies, 13(3), 49

Publisher   ADS

Unequivocal detection of the tidal deformation of a red giant in a binary system via interferometry

Merc, J., Boffin H. M. J. (2024). A&A, 692, A218

Publisher   ADS

Accretion-induced flickering variability among symbiotic stars from space photometry with NASA TESS

Merc, J., Beck, P. G., Mathur, S., García, R. A. (2024). A&A, 683, A84

Publisher   ADS

2026

• Zakamska, N., Adamane Pallathadka, G., Bizyaev, D., Merc, J. et al. (2026). ASASSN-24fw: Candidate gas-rich circumsecondary disk occultation of a main-sequence star. Accepted in AJ
• Merc, J., Mikołajewska, J., Iłkiewicz, K. et al. (2026). Identification of new Galactic symbiotic stars with SALT - II. New discoveries and characterization of the sample. Accepted in Monthly Notices of the Royal Astronomical Society
• Merc, J., Mikołajewska, J., Gałan, C. et al. (2026). Blending-induced beating and emission in the symbiotic star Terz V 2513. Monthly Notices of the Royal Astronomical Society, 545, staf2094

2025

• Melo, A., Sanchez-Saez, P., Ivanov, V. D. et al. (2025). Spectroscopic Alerts for the Time-Domain Era. ESO Expanding Horizons White Paper
• Pala, A. F., Raddi, R., Rebassa-Mansergas, A. et al. (2025). White Dwarf Binaries: Probes of Future Astrophysics. ESO Expanding Horizons White Paper
• Amestoy, J., Godoy-Rivera, D., Beck, P. G. et al. (2025). Finding the sweet spot: Modelling of oscillating red giant binaries. Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, 483
• Zasche, P., Kučáková, H., Kára, J., Merc, J. et al. (2025). Six new doubly eclipsing quadruples in a 2+2 architecture. Astronomy & Astrophysics, 702, A234
• Boffin, H. M. J., Merc, J. (2025). Revisiting symbiotic binaries with interferometry: II. New PIONIER data. Astronomy & Astrophysics, 702, A151
• Merc, J., Guerrero, M. A., Toalá, J. A., Ortiz, R. (2025). CGCS 6306, another X-ray-emitting asymptotic giant branch star confirmed to be a symbiotic binary. Astronomy & Astrophysics, 699, A117
• Merc, J. (2025). Symbiotic stars in the era of modern ground- and space-based surveys. Galaxies, 13(3), 49
• Merc, J., Wyrzykowski, Ł., Beck, P. G. et al. (2025). Is the symbiotic recurrent nova T CrB late? Recent photometric evolution and comparison with past pre-outburst behaviour. Monthly Notices of the Royal Astronomical Society: Letters, 541, L14
• Merc, J., Mikołajewska, J., Petit, T. et al. (2025). V4141 Sgr: Outflows and repeated outbursts. Astronomy & Astrophysics Letters, 698, L4
• Wolf, M., Zasche, P., Zejda, M. et al. (2025). TESS light curves and period changes in low-mass eclipsing binary BB Persei. New Astronomy, 119, 102406
• Laversveiler, M., Gonçalves, D. R., Rocha-Pinto, H. J., Merc, J. (2025). The Local Group Symbiotic Star Population and its Tenuous Link with Type Ia Supernovae. Astronomy & Astrophysics, 698, A155
• Zasche, P., Henzl, Z., Mašek, M. et al. (2025). Three new 2+2 quadruple systems with changing inclination. Monthly Notices of the Royal Astronomical Society, 539, 1015
• Godoy-Rivera, D., Mathur, S., García, R. A., et al. (2025). Kepler meets Gaia DR3: Homogeneous extinction-corrected color-magnitude diagram and binary classification. Astronomy & Astrophysics, 696, A243
• Mulato, L., Merc, J., Charbonnel, S. et al. (2025). Search for new Galactic Wolf–Rayet stars using Gaia DR3: I. Candidate selection and the follow-up of the bright sample. Astronomy & Astrophysics, 695, A227
• Merc, J., Boffin, H. M. J. (2025). Revisiting symbiotic binaries with interferometry: I. The PIONIER archival collection. Astronomy & Astrophysics, 695, A61
• Howil, K., Wyrzykowski, Ł., Kruszyńska, K., et al. (2025). Uncovering the invisible: A study of Gaia18ajz, a candidate black hole revealed by microlensing. Astronomy & Astrophysics, 694, A94

2024

• Merc, J., Mikołajewska, J. (2024). Symbiotic stars, weird novae, and related embarrassing binaries. Nature Astronomy, 8, 1504
• Merc, J., Boffin, H. M. J. (2024). Unequivocal detection of the tidal deformation of a red giant in a binary system via interferometry. Astronomy & Astrophysics, 692, A218
• Wolf, M., Zasche, P., Kára, J., et al. (2024). Apsidal motion and TESS light curves of three southern close eccentric eclipsing binaries: GM Nor, V397 Pup, and PT Vel. Astronomy & Astrophysics, 690, A231
• Wu, Z., Dong, S., Yi, T., et al. (2024). Gaia22dkvLb: A Microlensing Planet Potentially Accessible to Radial-Velocity Characterization. Astronomical Journal, 168, 2, id. 62
• Zasche, P., Henzl, Z., Merc, J., et al. (2024). Eight new 2+2 doubly eclipsing quadruple systems detected. Astronomy & Astrophysics, 687, A6
• Gaia Collaboration, Panuzzo, P., Mazeh T., Arenou, F., et al. (2024). Discovery of a dormant 33 solar-mass black hole in pre-release Gaia astrometry. Astronomy & Astrophysics, 686, L2
• Merc, J., Velez, P., Charbonnel, S., et al. (2024). Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco. Astronomische Nachrichten, e20240017
• Merc, J., Love, T., Velez, P., et al. (2024). Spectroscopic classification of ASASSN-24by (AT 2024epj) as a classical nova in the LMC The Astronomer’s Telegram, 16545, 1
• Mainieri, A., Anderson, R. I., Brinchmann, J. et al. (2024). The Wide-field Spectroscopic Telescope (WST) Science White Paper.
• Merc, J., Beck, P. G., Mathur, S., García, R. A. (2024). Accretion-induced flickering variability among symbiotic stars from space photometry with NASA TESS. Astronomy & Astrophysics, 683, A84
• Zajaček, M., Czerny, B., Jaiswal, V. K., et al. (2024). Science with a small two-band UV-photometry mission III: Active Galactic Nuclei and nuclear transients. Space Science Reviews, 220, 29
• Krtička, J., Benáček, J., Budaj, J., et al. (2024). Science with a small two-band UV-photometry mission II: Observations of stars and stellar systems. Space Science Reviews, 220, 24
• Werner, N., Řípa, J., Thöne, C., et al. (2024). Science with a small two-band UV-photometry mission I: Mission description and follow-up observations of stellar transients. Space Science Reviews, 220, 11
• Beck, P. G., Grossmann, D. H., Steinwender, L., et al. (2024). Constraining stellar and orbital co-evolution through ensemble seismology of solar-like oscillators in binary systems: A census of oscillating red-giants and main-sequence stars in Gaia DR3 binaries. Astronomy & Astrophysics, 682, A7

2023

• Merc, J., Velez, P., Barker, H., et al. (2023). Gaia23clr: Outburst of the symbiotic star V2905 Sgr. The Astronomer’s Telegram, 16257, 1
• Nagy, Z., Park, S., Ábrahám, P., et al. (2023). The Gaia alerted fading of the FUor-type star Gaia21elv. Monthly Notices of the Royal Astronomical Society, 524, 3344
• Merc, J., Gális, R., Wolf, M., et al. (2023). Comprehensive analysis of a symbiotic candidate V503 Her. Astronomical Journal, 166, 65
• Zasche, P., Henzl, Z., Mašek, M., et al. (2023). Detection of seven 2+2 doubly eclipsing quadruple systems. Astronomy & Astrophysics, 675, A113
• Kára, J., Zharikov, S., Wolf, M., et al. (2023). The Z Camelopardalis-type star AY Piscium: stellar and accretion disk parameters. Astrophysical Journal, 950, 47
• Merc, J., Gális, R., Velez, P., et al. (2023). V618 Sgr: Galactic eclipsing symbiotic nova detected in repeated outbursts. Monthly Notices of the Royal Astronomical Society, 523, 163
• Petit, T., Merc, J., Gális, R., et al. (2023). DeGaPe 35: Amateur discovery of a new southern symbiotic star. New Astronomy, 98, 101943

2022

• Merc, J., Barker, H., Gális, R. (2022). Gaia22eor: Symbiotic Star V2756 Sgr Detected in a Deep Eclipse. Research Notes of the AAS, 6, 253
• Schatz, H., Becerril Reyes, A. D., Best, A., et al. (2022). Horizons: Nuclear Astrophysics in the 2020s and Beyond. Journal of Physics G: Nuclear and Particle Physics, 49, 110502
• Merc, J., Barker, H., Velez, P., et al. (2022). Spectroscopic monitoring of bright Galactic nova ASASSN-22hw. The Astronomer's Telegram, 15435, 1
• Merc, J., Velez, P., Barker, H., et al. (2022). Gaia22bou: First recorded outburst of symbiotic star WRAY 15-1167. The Astronomer's Telegram, 15340, 1
• Merc, J., Charbonnel, S., Garde, O., Le Dû, P., Mulato, L., Petit, T., Gális, R. (2022). Low-resolution Optical Spectroscopy of Recently Discovered Accreting-only Symbiotic Star THA 15–31. Research Notes of the AAS, 6, 54
• Merc, J., Gális, R., Wolf, M., Velez, P., Bohlsen, T., Barlow, B. N. (2022). Hen 3-860: new southern eclipsing symbiotic star observed in the outburst. Monthly Notices of the Royal Astronomical Society, 510, 1404

2021

• Merc, J., Gális, R., Velez, P., Charbonnel, S., Garde, O., Le Dû, P., Mulato, L.; Petit, T. (2021). Brightening of SS73 141: Outburst of Z And-type? The Astronomer’s Telegram, 14874, 1
• Merc, J., Gális, R., Garde, O., Mulato, L., Le Dû, P., Charbonnel, S., Petit, T. (2021). Ongoing brightening of the eclipsing symbiotic star AR Pav. The Astronomer’s Telegram, 14837, 1
• Merc, J., Gális, R., Wolf, M., Velez, P., Buil, C., et al. (2021). Spectroscopic and photometric analysis of symbiotic candidates - I. Ten candidates on classical symbiotic stars. Monthly Notices of the Royal Astronomical Society, 506, 4151
• Mártonfi, P., Gális, R., Merc, J. (2021). Long-term photometric activity of AX Persei. Open European Journal on Variable Stars, 220, 26
• Merc, J., Gális, R., Vrašťák, M., Teyssier, F., Boyd, D., Leedjärv, L., Wolf, M. (2021). Symbiotic binaries as ideal targets for amateur observers. Open European Journal on Variable Stars, 220, 11
• Merc, J., Gális, R., Charbonnel, S., Garde, O., Le Dû, P., Mulato, L., Petit, T. (2021). TCP J18224935-2408280 is an outburst of a symbiotic star. The Astronomer’s Telegram, 14691, 1
• Wolf, M., Kučáková, H., Zasche, P., Hornoch, K., Kára, J., Merc, J., Zejda, M. (2021). Possible substellar companions in dwarf eclipsing binaries: SDSS J143547.87+373338.5, NSVS 7826147, and NSVS 14256825. Astronomy & Astrophysics, 647, A65
• Merc, J., Gális, R., Leedjärv, L., Wolf, M. (2021). Yellow symbiotic star AG Draconis in the scope of the New Online Database of Symbiotic Variables. The Golden Age of Cataclysmic Variables and Related Objects - V, Proceedings of Science, 368, 43
• Merc, J., Kalup, Cs., Rathour, R. S., Sánches Arias, J. P., Beck, P. G. (2021). Asteroseismology of the heartbeat star KIC 5006817. Contributions of the Astronomical Observatory Skalnaté Pleso, 51, 45
• Dubovský, P. A., Merc, J., Gális, R., Wolf, M. (2021). Spectroscopic confirmation of the active dwarf nature of 2MASS J07363415+6538548. Research Notes of the AAS, 5, 11

2020

• Merc, J., Gális, R., Wolf, M. (2020). Spectroscopic analysis of selected symbiotic candidates. WDS'20 Proceedings of Contributed Papers, 45
• Merc, J., Mikołajewska, J., Gromadzki, M., Gałan, C., Iłkiewicz, K., et al. (2020). Gaia18aen: First symbiotic star discovered by Gaia. Astronomy & Astrophysics, 644, A49
• Merc, J., Gális, R., Kára, J., Wolf, M., Vrašťák, M. (2020). The nature of the symbiotic candidate 2MASS J07363415+6538548 in the field of NGC 2403. Monthly Notices of the Royal Astronomical Society, 499, 2116
• Zasche, P., Wolf, M., Kučáková, H., Kára, J., Merc, J., Zejda, M., Skarka, M., Janík, J., Kurfürst, P. (2020). First apsidal motion and light curve analysis of 162 eccentric eclipsing binaries from LMC. Astronomy & Astrophysics, 640, A33
• Merc, J., Gális, R., Wolf, M. (2020). Galactic members in the New Online Database of Symbiotic Variables. Contributions of the Astronomical Observatory Skalnaté Pleso, 50, 426

2019

• Merc, J., Gális, R., Wolf, M. (2019). Symbiotic Variables in the Local Group and Beyond. WDS'19 Proceedings of Contributed Papers, 165
• Cabello, C., Csörnyei, G., Merc, J., Ferreiros, V., Pessev, P. (2019). Independent Study and Spectral Classification of a Sample of Poorly Studied High Proper Motion M-dwarf Candidate Stars. Contributions of the Astronomical Observatory Skalnaté Pleso, 49, 546
• Merc, J., Gális, R., Wolf, M. (2019). New Online Database of Symbiotic Variables: Symbiotics in X-rays. Astronomische Nachrichten, 340, 7, 598 (Editor’s Choice)
• Merc, J., Gális, R., Wolf, M. (2019). New Online Database of Symbiotic Variables. Eruptive Stars Information Letter, 41, 78
• Merc, J., Gális, R., Teyssier, F. (2019). Study of long-term spectroscopic variability of symbiotic stars based on observations of the ARAS Group. Contributions of the Astronomical Observatory Skalnaté Pleso, 49, 228
• Gális, R., Merc, J., Leedjärv, L. (2019). The current active stage of the symbiotic system AG Draconis. Contributions of the Astronomical Observatory Skalnaté Pleso, 49, 197
• Merc, J., Gális, R., Wolf, M., Leedjärv, L., Teyssier, F. (2019). The activity of the symbiotic binary Z Andromedae and its last outburst. Open European Journal on Variable Stars, 197, 23
• Gális, R., Merc, J., Leedjärv, L., Vrašťák, M., Karpov, S. (2019). The peculiar outburst activity of the symbiotic binary AG Draconis. Open European Journal on Variable Stars, 197, 15
• Merc, J., Gális, R., Teyssier, F., Boyd, D., Sims, W., Boussin, C., Campos, F. (2019). The symbiotic star AX Per is going into strong outburst. The Astronomer’s Telegram, 12660, 1
• Merc, J., Gális, R., Wolf, M. (2019). First release of the New Online Database of Symbiotic Variables. Research Notes of the AAS, 3, 28

2018

• Merc, J., Gális, R. (2018). CorrLAB: Correlation and Period Analysis Software. Astronomical Journal, 156, 111
• Merc, J., Gális, R., Vrašťák, M., Leedjärv, L. (2018). The fourth outburst during the ongoing active stage of AG Draconis has finished. Research Notes of the AAS, 2, 142
• Merc, J., Gális, R., Leedjärv, L. (2018). Recent outburst activity of the symbiotic binary AG Draconis. The Golden Age of Cataclysmic Variables and Related Objects - IV, Proceedings of Science, 315, 60
• Gális, R., Merc, J., Vrašták, M., Teyssier, F., Lester, T., Boyd, D., Sims, W., Leedjärv, L. (2018). The fourth outburst during the present active stage of symbiotic binary AG Dra. The Astronomer's Telegram, 11559, 1

2017

• Merc, J., Gális, R., Leedjärv, L. (2017). Recent outburst activity of the super-soft X-ray binary AG Draconis. Contributions of the Astronomical Observatory Skalnaté Pleso, 47, 192
• Gális, R., Merc, J., Leedjärv, L. (2017). Outburst activity of the symbiotic binary AG Dra. Open European Journal on Variable Stars, 180, 24

2016

• Merc, J., Gális, R. (2016). Korelačná analýza fotometrických a spektroskopických dát symbiotických systémov AG Dra a Z And. Prírodovedec č. 635, 197
• Gális, R., Hric, L., Leedjärv, L., Merc, J. (2016). Outburst activity of the symbiotic binary AG Dra. Open European Journal on Variable Stars, 176, 22
• Leedjärv, L., Gális, R., Hric, L., Merc, J., Burmeister, M. (2016). Spectroscopic view on the outburst activity of the symbiotic binary AG Draconis. Monthly Notices of the Royal Astronomical Society, 456 2558

Talks

2025

• October 2025 - Merc, J., Jones, D., Escorza A. et al. The all-aspects-peculiar K 1-6: A zombie nebula that just won’t rest in peace (IAC Severo Ochoa line monthly meeting, La Laguna, Tenerife, Spain)
• September 2025 - Merc, J. Outbursts of new and known symbiotic binaries with Gaia Science Alerts. (The 16th Gaia Science Alerts and ACME Time-Domain Workshop, La Laguna, Tenerife, Spain)
• September 2025 - Merc, J. When a PN isn’t a PN: Symbiotic stars and their relatives in Gaia data. (Asymmetric Post-main-sequence Nebulae 9, Granada, Spain)
• September 2025 - Merc, J. Optical spectroscopy of symbiotic binaries: From discovery to diagnostics. (WST 20 minutes time-domain talks , held online)
• September 2025 - Merc, J. Symbiotic stars and related objects in the era of large surveys and machine-learning (Invited talk). (The Golden Age of Cataclysmic Variables and Related Objects - VII, Palermo, Italy)
• July 2025 - Merc, J., Beck, P. G., Mathur, S., García, R. A. Short-term variability of symbiotic binaries observed with TESS. (Binary Stars in the Space Era, Keele, UK)
• July 2025 - Merc, J., Boffin, H. M. J. Interferometry of a tidally deformed giant: Prospects for symbiotic stars. (European Astronomical Society Annual Meeting 2025, Cork, Ireland)
• January 2025 - Merc, J. Symbiotic binaries: Do we understand them now, in the Gaia era? (Seminar at the Instituto de Astrofísica de Andalucía, Granada, Spain)

2024

• November 2024 - Merc, J. Revisiting mass transfer and accretion in symbiotic binaries in the Gaia era. (IAC Research Division Seminar, La Laguna, Tenerife, Spain)
• October 2024 - Merc, J. Symbiotic stars in the era of modern ground- and space-based surveys (Invited talk). (Hot Stars: Life with Circumstellar Matter, Almaty, Kazakhstan)
• August 2024 - Merc, J. Symbiotic binaries in the era of space-based surveys. (Seminar of Dr. Karl Remeis Observatory, Bamberg, Germany)
• July 2024 - Merc, J., Mulato, L. Validation of Gaia DR3 symbiotic candidates and search for new symbiotic sources. (European Astronomical Society Annual Meeting 2024, Padova, Italy)
• June 2024 - Merc, J., Beck, P. G., Mathur, S., García, R. A. Variability of symbiotic stars from the New Online Database of Symbiotic Variables with NASA TESS. (Symbiotic stars, weird novae, and related embarrassing binaries, Prague, Czech Republic)

2023

• October 2023 - Merc, J. Symbiotic binaries observed from space with Gaia and TESS. (Seminar of the Astronomical Institute of Charles University. Prague, Czech Republic)
• October 2023 - Merc, J. Detecting symbiotic stars in outbursts. (14th ORP Gaia Science Alerts Workshop 2023, Valletta, Malta)
• July 2023 - Merc, J. Large-scale photometric surveys in the study of symbiotic stars. (European Astronomical Society Annual Meeting 2023, Kraków, Poland)
• June 2023 - Mártonfi, P., Gális, R., Merc, J. Long-term evolution of colour indices of the symbiotic system AX Persei. (Bezovec 2023: Conference of young astronomers, Nová Lehota, Slovakia)
• May 2023 - Merc, J., Beck, P. G., Mathur, S., Garcia, R. A. Analyzing the short-term variability of symbiotic stars with TESS. (IAC Severo Ochoa line monthly meeting, La Laguna, Tenerife, Spain)
• May 2023 - Merc, J. Symbiotic binaries in the era of Gaia and other surveys. (IAC Research Division Seminar, La Laguna, Tenerife, Spain)
• March 2023 - Merc, J. Symbiotic binaries in the era of Gaia and other surveys. (Seminar of the Institute of Astronomy of Nicolaus Copernicus University in Toruń, Poland)

2022

• October 2022 - Merc, J. Symbiotic binaries: A 100-year-old puzzle. (Seminar of the Institute of Theoretical Physics and Astrophysics, Brno, Czech Republic)
• October 2022 - Merc, J., Nagy, Zs., Kóspál, A., et al. Gaia's first symbiotic nova and first extragalactic symbiotic star. (13th ORP Gaia Science Alerts Workshop 2022, Pula, Sardinia, Italy)
• July 2022 - Merc, J. Symbiotic binaries: Results of the ongoing pro-am collaboration (Invited talk). (OHP 2022 Spectroscopy Meeting, Saint-Michel-l'Observatoire, France)
• July 2022 - Merc, J. Symbiotic binaries: Ideal targets for amateur observers (Invited talk). (OHP 2022 Spectroscopy Meeting, Saint-Michel-l'Observatoire, France)
• June 2022 - Merc, J. New Online Database of Symbiotic Variables as a tool for understanding the symbiotic population. (Meeting of students of astronomy and astrophysics from Czech and Slovak universities. Ostrava, Czech Republic)
• May 2022 - Merc, J. Symbiotic binaries: Ideal targets for amateur observers (Invited talk). (VEGA 2022 International Spectroscopy Symposium. Haunsberg, Austria)

2021

• November 2021 - Merc, J., Gális, R., Wolf, M. et al. Spectroscopic and photometric analysis of symbiotic candidates (53. konference o výzkumu proměnných hvězd a exoplanet. Prague, Czech Republic)
• November 2021 - Merc, J., Gális, R., Wolf, M. Search for outbursting symbiotic stars using the Gaia Science Alerts (12th Gaia Science Alerts workshop and the First ORP Time-Domain meeting. Heraklion, Greece)
• September 2021 - Merc, J., Gális, R., Wolf, M. et al. Spectroscopic and photometric analysis of symbiotic candidates: Lessons learned from the ongoing campaign (Bezovec 2021: Conference of young astronomers, Nová Lehota, Slovakia)
• September 2021 - Merc, J., Mikołajewska, J., Gromadzki, M., Gałan, C., Iłkiewicz, K., et al. Gaia18aen: First symbiotic binary discovered by Gaia (Bezovec 2021: Conference of young astronomers, Nová Lehota, Slovakia)
• September 2021 - Merc, J., Gális, R., Wolf, M. New Online Database of Symbiotic Variables as a tool for understanding the symbiotic population. (ChETEC MC+WG Main Meeting, Lisbon, Portugal)
• September 2021 - Merc, J., Mikołajewska, J., Gromadzki, M., Gałan, C., Iłkiewicz, K., et al. Gaia18aen: First symbiotic binary discovered by Gaia (25th Conference of Slovak Physicists. Bratislava, Slovakia, held online)
• May 2021 - Merc, J. Is it a symbiotic binary?! (Seminar of the Astronomical Institute of Charles University. Prague, Czech Republic, held online)
• March 2021 - Merc, J., Gális, R., Wolf, M. Symbiotic binaries and where to find them. (AstroWorkshop FMFI UK, Bratislava, Slovakia, held online)
• January 2021 - Merc, J., Mikołajewska, J., Gromadzki, M., Gałan, C., Iłkiewicz, K., et al. Gaia18aen: First symbiotic binary discovered by Gaia (11th OPTICON Gaia Science Alerts Workshop. Poland/United Kingdom, held online)

2020

• December 2020 - Merc, J. Symbiotic binaries: The mystery of cool giants and hot dwarfs. (Seminar of Stellar Physic Department of AI ASCR. Ondřejov, Czech Republic, held online)
• October 2020 - Merc, J., Gális, R., Vrašťák, M., Teyssier, F., Leedjärv, L., Wolf, M. Symbiotic binaries as ideal targets for amateur observers. (52. konference o výzkumu proměnných hvězd a exoplanet. Prague, Czech Republic, held online)
• October 2020 - Merc, J. Symbiotic binaries: A story of giants and dwarfs. (Seminar of the Astronomical Institute of Charles University. Prague, Czech Republic, held online)
• October 2020 - Merc, J., Gális, R. Symbiotic binaries at P. J. Šafárik University. (Bezovec 2020: Astronomical Research in Slovakia. Hlohovec, Slovakia, held online)
• September 2020 - Merc, J., Gális, R., Wolf, M. Characterizing the symbiotic population using the Gaia data. (International Annual Meeting of the German Astronomical Society. Germany, held online)
• September 2020 - Merc, J., Gális, R., Wolf, M. Spectroscopic analysis of selected symbiotic candidates. (Week of Doctoral Students 2020 focused on physical study branches. Prague, Czech Republic, held online)
• September 2020 - Merc, J., Gális, R., Leedjärv, L. Symbiotic binaries in the scope of the ChETEC project. (ChETEC Period 4 Main Event. Split, Croatia, held online)
• August 2020 - Kalup, Cs., Merc, J., Rathour, R. S., Sánches Arias, J. P., Beck, P. Asteroseismology of red giant KIC 5006817 (ERASMUS Summer School, GAIA & TESS: Tools for understanding of the Local Universe. Brno, Czech Republic, held online)

2019

• September 2019 - Merc, J., Gális, R., Wolf, M. New Online Database of Symbiotic Variables. (Universe of Binaries, Binaries in the Universe, Telč, Czech Republic)
• September 2019 - Merc, J., Gális, R., Leedjärv, L., Wolf, M. Yellow symbiotic star AG Draconis in the scope of the New Online Database of Symbiotic Variables (Invited talk). (The Golden Age of Cataclysmic Variables and Related Objects IV, Palermo, Italy)
• June 2019 – Ferreiros, V., Merc, J., Csörnyei, G., Cabello, C., Pessev, P. Spectral Clasification of a Sample of Poorly Studied High Proper Motion M-dwarf Candidate Stars (ERASMUS/OPTICON Summer School, Observational Astrophysics: from proposals to publication, Stará Lesná, Slovakia)
• June 2019 - Merc, J., Gális, R., Wolf, M. Symbiotic variables in the Local Group and beyond. (Week of Doctoral Students 2019 focused on physical study branches, Prague, Czech Republic)
• June 2019 - Merc, J., Gális, R., Teyssier, F., Boyd, D., Leedjärv, L., Wolf, M. Spectroscopic study of (up to) four outbursts of the four symbiotic stars in the recent four years. (Conference about succeses of stellar astronomy "Bezovec 2019", Slovakia)
• June 2019 - Merc, J., Gális, R., Wolf, M. New Online Database of Symbiotic Variables. (Conference about succeses of stellar astronomy "Bezovec 2019", Slovakia)
• May 2019 - Merc, J., Gális, R., Wolf, M. New Online Database of Symbiotic Variables: Symbiotics in X-rays. (16th INTEGRAL/BART Workshop, Karlovy Vary, Czech Republic)
• January 2019 - Merc, J., Gális, R., Wolf, M., Leedjärv, L. Symbiotic binaries, more than a century old puzzle. (Tříkrálová konference 2019: Setkání českých a slovenských fyziků, Prague, Czech Republic)

2018

• December 2018 - Merc, J., Gális, R., Leedjärv, L. AG Draconis, a mystery older than the Republic. (Seminár Katedry teoretickej fyziky a astrofyziky PF UPJŠ, Košice, Slovakia)
• December 2018 - Merc, J., Gális, R., Wolf, M., Leedjärv, L., Teyssier, F. The activity of the symbiotic binary Z Andromedae and its last outburst. (50. konference o výzkumu proměnných hvězd a exoplanet, Brno, Czech Republic)
• November 2018 - Merc, J., Gális, R., Leedjärv, L. The activity of the symbiotic binaries AG Dra, AG Peg and Z And observed by amateur astronomers. (Astronoomia seminarid, Tartu Observatoorium, Tõravere, Estonia)
• September 2018 - Merc, J., Gális, R., Teyssier, F. - Study of long-term spectroscopic variability of symbiotic stars based on observations of the ARAS Group. (Observing techniques, instrumentation and science for metre-class telescopes II, Stará Lesná, Slovakia)

2017

• September 2017 - Merc, J.,Gális, R., Leedjärv, L. Recent outburst activity of the symbiotic binary AG Draconis. (The Golden Age of Cataclysmic Variables and Related Objects IV, Palermo, Italy)
• June 2017 - Merc, J., Gális, R. CorrLAB - Correlation and period analysis software. (Conference about successes of stellar astronomy “Bezovec 2017″, Slovakia)

2015

• December 2015 – Merc, J., Gális, R., Leedjärv, L. Correlation analysis of photometric and spectroscopic data of symbiotic systems AG Dra and Z And. (International meeting on variable star research “Kolos 2015″, Slovakia)
• June 2015 – Merc, J., Gális, R., Leedjärv, L. Spectroscopic research of symbiotic binary star AG Dra. (Conference about successes of stellar astronomy “Bezovec 2015″, Slovakia)

Posters

2025

• September 2025 - Merc, J., Wyrzykowski, Ł., Beck, P. G. et al. Monitoring T CrB with the BHTOM telescope network. (The 16th Gaia Science Alerts and ACME Time-Domain Workshop, La Laguna, Tenerife, Spain)
• September 2025 - Merc, J., Jones, D., Escorza, A., Boffin, H. M. J., Sowicka, P. Triple central star of PN K 1-6 and its puzzling variability. (Asymmetric Post-main-sequence Nebulae 9, Granada, Spain)
• July 2025 - Merc, J., Boffin, H. M. J. Interferometric constraints on mass transfer in symbiotic binaries. (European Astronomical Society Annual Meeting 2025, Cork, Ireland)
• July 2025 - Merc, J., Mulato, L., Charbonnel, S., Garde, S., Le Dû, P., Petit, T. Search for new Galactic Wolf-Rayet stars using Gaia DR3. (European Astronomical Society Annual Meeting 2025, Cork, Ireland)

2024

• September 2024 - Mártonfi, P., Gális, R., Merc, J. Advanced analysis of the light curves of the symbiotic system AX Persei. (Binary and Multiple Stars in the Era of Big Sky Surveys, Litomyšl, Czech Republic)
• July 2024 - Godoy-Rivera, D.,Mathur, S., Garía, R. A. et al. Kepler meets Gaia: Binary Systems, Color-Magnitude Diagram, and Kinematic Analysis. (8th TESS/15th Kepler Asteroseismic Science Consortium Workshop, Porto, Portugal)
• July 2024 - Merc, J., Beck, P. G., Mathur, S., García, R. A. Accretion-induced variability of interacting red giant binaries masquerading as oscillations. (European Astronomical Society Annual Meeting 2024, Padova, Italy)
• June 2024 - Merc, J. Symbiotic stars in Gaia DR3. (Symbiotic stars, weird novae, and related embarrassing binaries, Prague, Czech Republic)
• June 2024 - Merc, J., Gális, R., Wolf, M. et al. Pro-am collaboration in the classification of symbiotic candidates from the New Online Database of Symbiotic Variables. (Symbiotic stars, weird novae, and related embarrassing binaries, Prague, Czech Republic)
• June 2024 - Gális, R., Merc, J., Leedjärv, L. Active stages of the symbiotic system AG Draconis. (Symbiotic stars, weird novae, and related embarrassing binaries, Prague, Czech Republic)
• June 2024 - Mártonfi, P., Gális, R., Merc, J. Emission lines in the spectra of the symbiotic system AX Persei. (Symbiotic stars, weird novae, and related embarrassing binaries, Prague, Czech Republic)

2023

• September 2023 - Merc, J., Gális, R., Wolf, M., Mulato, L. Symbiotic stars in Gaia DR3. (The Milky Way Revealed by Gaia: The Next Frontier, Barcelona, Spain)
• July 2023 - Merc, J., Beck, P. G., Mathur, S., Garcia, R. A. Accretion-induced variability of interacting red giant binaries masquerading as oscillations. (TESS/Kepler Asteroseismic Science Consortium Workshop, Honolulu, Hawaiʻi, USA)
• July 2023 - Beck, P. G.,, Grossmann, D. H., Steinwender, L., et al. Constraining advanced stellar evolution from ensemble asteroseismology of binaries. (TESS/Kepler Asteroseismic Science Consortium Workshop, Honolulu, Hawaiʻi, USA)
• July 2023 - Merc, J., Gális, R., Wolf, M., Mulato, L. Symbiotic stars in Gaia DR3. (European Astronomical Society Annual Meeting 2023, Kraków, Poland)
• July 2023 - Gális, R., Merc, J., Leedjärv, L. Recent active and quiescent stages of the symbiotic star AG Draconis. (European Astronomical Society Annual Meeting 2023, Kraków, Poland)
• July 2023 - Mártonfi, P., Gális, R., Merc, J. Colour indices and the new ephemeris of the symbiotic system AX Persei. (European Astronomical Society Annual Meeting 2023, Kraków, Poland)

2022

• August 2022 – Kára, J., Zharikov, S., Wolf, M., et al. Light curve modelling and Doppler Tomography of AY Psc. (EUROWD22: 22nd European Workshop on White Dwarfs, Tübingen, Germany)
• June 2022 - Merc, J., Gális, R., Wolf, M. Search for outbursting symbiotic stars using the Gaia Science Alerts. (European Astronomical Society Annual Meeting 2022, Valencia, Spain)

2021

• June 2021 – Gális, R., Merc, J., Leedjärv, L. Active and quiescent stages of the symbiotic system AG Draconis. (European Astronomical Society Annual Meeting 2021, Leiden, Netherlands, held online)
• June 2021 - Merc, J., Mikołajewska, J., Gromadzki, M., Gałan, C., Iłkiewicz, K., et al. Gaia18aen: First symbiotic binary discovered by Gaia (European Astronomical Society Annual Meeting 2021, Leiden, Netherlands, held online)
• March 2021 – Merc, J., Gális, R., Wolf, M. Characterising cool giants in symbiotic binaries using the Gaia EDR3 data. (The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, held online)

2020

• September 2020 – Merc, J., Gális, R., Wolf, M. New Online Database of Symbiotic Variables. (Royal Astronomical Society Early Career Poster Exhibition. United Kingdom, held online)
• June 2020 – Merc, J., Gális, R., Teyssier, F. A need for long-term spectroscopic data in the investigation of symbiotic binaries. (European Astronomical Society Annual Meeting 2020, Leiden, Netherlands, held online)
• June 2020 – Merc, J., Gális, R., Wolf, M. Characterizing the symbiotic population using the Gaia data. (European Astronomical Society Annual Meeting 2020, Leiden, Netherlands, held online)
• June 2020 – Gális, R., Merc, J., Leedjärv, L. Clumpy environment around accreting compact objects in symbiotic systems. (European Astronomical Society Annual Meeting 2020, Leiden, Netherlands, held online)

2019

• June 2019 – Gális, R., Merc, J., Leedjärv, L. Accretion-related winds in the symbiotic stars with Z And-type outburst activity. (European Week of Astronomy and Space Science 2019, Lyon, France)