Validation of up to seven TESS planet candidates through multi-colour transit photometry using MuSCAT2 data
Abstract
The TESS mission searches for transiting exoplanets by monitoring the brightness of hundreds of thousands of stars across the entire sky. M-type planet hosts are ideal targets for this mission due to their smaller size and cooler temperatures, which makes it easier to detect smaller planets near or within their habitable zones. Additionally, M~dwarfs have a smaller contrast ratio between the planet and the star, making it easier to measure the planet's properties accurately. Here, we report the validation analysis of 13 TESS exoplanet candidates orbiting around M dwarfs. We studied the nature of these candidates through a multi-colour transit photometry transit analysis using several ground-based instruments (MuSCAT2, MuSCAT3, and LCO-SINISTRO), high-spatial resolution observations, and TESS light curves. We present the validation of five new planetary systems: TOI-1883b, TOI-2274b, TOI2768b, TOI-4438b, and TOI-5319b, along with compelling evidence of a planetary nature for TOIs 2781b and 5486b. We also present an empirical definition for the Neptune desert boundaries. The remaining six systems could not be validated due to large true radius values overlapping with the brown dwarf regime or, alternatively, the presence of chromaticity in the MuSCAT2 light curves.
Cite
@article{arxiv.2409.07400,
title = {Validation of up to seven TESS planet candidates through multi-colour transit photometry using MuSCAT2 data},
author = {A. Peláez-Torres and E. Esparza-Borges and E. Pallé and H. Parviainen and F. Murgas and G. Morello and M. R. Zapatero-Osorio and J. Korth and N. Narita and A. Fukui and I. Carleo and R. Luque and N. Abreu García and K. Barkaoui and A. Boyle and V. J. S. Béjar and Y. Calatayud-Borras and D. V. Cheryasov and J. L. Christiansen and D. R. Ciardi and G. Enoc and Z. Essack and I. Fukuda and G. Furesz and D. Galán and S. Geraldía-González and S. Giacalone and H. Gill and E. J. Gonzales and Y. Hayashi and K. Ikuta and K. Isogai and T. Kagetani and Y. Kawai and K. Kawauchi and P. Klagyvik and T. Kodama and N. Kusakabe and A. Laza-Ramos and J. P. de Leon and J. H. Livingston and M. B. Lund and A. Madrigal-Aguado and P. Meni and M. Mori and S. Muñoz Torres and J. Orell-Miquel and M. Puig and G. Ricker and M. Sánchez-Benavente and A. B. Savel and J. E. Schlieder and R. P. Schwarz and R. Sefako and P. Sosa-Guillén and M. Stangret and C. Stockdale and M. Tamura and Y. Terada and J. D. Twicken and N. Watanabe and J. Winn and S. G. Zheltoukhov and C. Ziegler and Y. Zou},
journal= {arXiv preprint arXiv:2409.07400},
year = {2025}
}