ATREIDES I. Embarking on a trek across the exo-Neptunian landscape with the TOI-421 system

@misc{bourrier2025atreidesembarkingtrek,
      title={ATREIDES I. Embarking on a trek across the exo-Neptunian landscape with the TOI-421 system},
      author={V. Bourrier and M. Steiner and A. Castro-González and D.J. Armstrong and M. Attia and S. Gill and M. Timmermans and J. Fernandez and F. Hawthorn and A.H.M.J. Triaud and F. Murgas and E. Palle and H. Chakraborty and K. Poppenhaeger and M. Lendl and D.R. Anderson and E.M. Bryant and E. Friden and J.V. Seidel and M.R. Zapatero Osorio and F. Eeles-Nolle and M. Lafarga and I.S. Lockley and J. Serrano Bell and R. Allart and A. Meech and A. Osborn and R.F. Díaz and M. A. Fetzner Keniger and G. Frame and A. Heitzmann and A. Ringham and P. Eggenberger and Y. Alibert and J.M. Almenara and A. Leleu and S.G. Sousa and S.J. Mercier and V. Adibekyan and M.P. Battley and E. Delgado Mena and W. Dethier and J.A. Egger and K. Barkaoui and D. Bayliss and A.Y. Burdanov and E. Ducrot and M. Ghachoui and M. Gillon and Y. Gómez Maqueo Chew and E. Jehin and P.P. Pedersen and F.J. Pozuelos and P.J. Wheatley and S. Zúniga-Fernández and Y. Carteret and H.M. Cegla and A.C.M. Correia and Y.T. Davis and L. Doyle and D. Ehrenreich and N.C. Hara and B. Lavie and J. Lillo-Box and C. Lovis and A.C. Petit and N.C. Santos and M.G. Scott and J. Venturini and E.-M. Ahrer and S. Aigrain and S.C.C. Barros and E. Gillen and X. Luo and C. Mordasini and K. Al Moulla and F. Pepe and A.G.M. Pietrow},
      year={2025},
      eprint={2509.15746},
      archivePrefix={arXiv},
      primaryClass={astro-ph.EP},
      url={https://arxiv.org/abs/2509.15746},
}