The CARMENES search for exoplanets around M dwarfs. Revisiting the GJ 317, GJ 463, and GJ 3512 systems and two newly discovered planets orbiting GJ 9773 and GJ 508.2

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Main Authors:	Morales, J. C., Ribas, I., Reffert, S., Perger, M., Dreizler, S., Anglada-Escudé, G., Béjar, V. J. S., Herrero, E., Kemmer, J., Kuzuhara, M., Lafarga, M., Livingston, J. H., Murgas, F., Ogunwale, B. B., Tal-Or, L., Trifonov, T., Vanaverbeke, S., Amado, P. J., Quirrenbach, A., Reiners, A., Caballero, J. A., Fernández, J. F. Agüí, Banegas, J., Chaturvedi, P., Dufoer, S., Hatzes, A. P., Henning, Th., Rodríguez-López, C., Schweitzer, A., Solano, E., Zechmeister, M., Harakawa, H., Kotani, T., Omiya, M., Sato, B., Tamura, M.
Format:	Preprint
Published:	2025
Subjects:	Earth and Planetary Astrophysics
Online Access:	Acceder al recurso
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_version_	1866908458861723648
author	Morales, J. C. Ribas, I. Reffert, S. Perger, M. Dreizler, S. Anglada-Escudé, G. Béjar, V. J. S. Herrero, E. Kemmer, J. Kuzuhara, M. Lafarga, M. Livingston, J. H. Murgas, F. Ogunwale, B. B. Tal-Or, L. Trifonov, T. Vanaverbeke, S. Amado, P. J. Quirrenbach, A. Reiners, A. Caballero, J. A. Fernández, J. F. Agüí Banegas, J. Chaturvedi, P. Dufoer, S. Hatzes, A. P. Henning, Th. Rodríguez-López, C. Schweitzer, A. Solano, E. Zechmeister, M. Harakawa, H. Kotani, T. Omiya, M. Sato, B. Tamura, M.
author_facet	Morales, J. C. Ribas, I. Reffert, S. Perger, M. Dreizler, S. Anglada-Escudé, G. Béjar, V. J. S. Herrero, E. Kemmer, J. Kuzuhara, M. Lafarga, M. Livingston, J. H. Murgas, F. Ogunwale, B. B. Tal-Or, L. Trifonov, T. Vanaverbeke, S. Amado, P. J. Quirrenbach, A. Reiners, A. Caballero, J. A. Fernández, J. F. Agüí Banegas, J. Chaturvedi, P. Dufoer, S. Hatzes, A. P. Henning, Th. Rodríguez-López, C. Schweitzer, A. Solano, E. Zechmeister, M. Harakawa, H. Kotani, T. Omiya, M. Sato, B. Tamura, M.
contents	Surveys for exoplanets indicate that the occurrence rate of gas giant planets orbiting late-type stars in orbits with periods shorter than 1000 days is lower than in the case of Sun-like stars. This is in agreement with planet formation models based on the core or pebble accretion paradigm. The CARMENES exoplanet survey has been conducting radial-velocity observations of several targets that show long-period trends or modulations that are consistent with the presence of giant planets at large orbital separations. We present an analysis of five such systems that were monitored with the CARMENES spectrograph, as well as with the IRD spectrograph. In addition, we used archival data to improve the orbital parameters of the planetary systems. We improve the parameters of three previously known planets orbiting the M dwarfs GJ 317, GJ 463, and GJ 3512. We also determine the orbital parameters and minimum mass of the planet GJ 3512 c, for which only lower limits had been given previously. Furthermore, we present the discovery of two new giant planets orbiting the stars GJ 9733 and GJ 508.2, although for the second one only lower limits to the orbital properties can be determined. The new planet discoveries add to the short list of known giant planets orbiting M-dwarf stars with subsolar metallicity at long orbital periods above 2000 days. These results reveal that giant planets appear to form more frequently in wide orbits than in close-in orbits around low-mass and lower metallicity stars.
format	Preprint
id	arxiv_https___arxiv_org_abs_2507_15516
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	The CARMENES search for exoplanets around M dwarfs. Revisiting the GJ 317, GJ 463, and GJ 3512 systems and two newly discovered planets orbiting GJ 9773 and GJ 508.2 Morales, J. C. Ribas, I. Reffert, S. Perger, M. Dreizler, S. Anglada-Escudé, G. Béjar, V. J. S. Herrero, E. Kemmer, J. Kuzuhara, M. Lafarga, M. Livingston, J. H. Murgas, F. Ogunwale, B. B. Tal-Or, L. Trifonov, T. Vanaverbeke, S. Amado, P. J. Quirrenbach, A. Reiners, A. Caballero, J. A. Fernández, J. F. Agüí Banegas, J. Chaturvedi, P. Dufoer, S. Hatzes, A. P. Henning, Th. Rodríguez-López, C. Schweitzer, A. Solano, E. Zechmeister, M. Harakawa, H. Kotani, T. Omiya, M. Sato, B. Tamura, M. Earth and Planetary Astrophysics Surveys for exoplanets indicate that the occurrence rate of gas giant planets orbiting late-type stars in orbits with periods shorter than 1000 days is lower than in the case of Sun-like stars. This is in agreement with planet formation models based on the core or pebble accretion paradigm. The CARMENES exoplanet survey has been conducting radial-velocity observations of several targets that show long-period trends or modulations that are consistent with the presence of giant planets at large orbital separations. We present an analysis of five such systems that were monitored with the CARMENES spectrograph, as well as with the IRD spectrograph. In addition, we used archival data to improve the orbital parameters of the planetary systems. We improve the parameters of three previously known planets orbiting the M dwarfs GJ 317, GJ 463, and GJ 3512. We also determine the orbital parameters and minimum mass of the planet GJ 3512 c, for which only lower limits had been given previously. Furthermore, we present the discovery of two new giant planets orbiting the stars GJ 9733 and GJ 508.2, although for the second one only lower limits to the orbital properties can be determined. The new planet discoveries add to the short list of known giant planets orbiting M-dwarf stars with subsolar metallicity at long orbital periods above 2000 days. These results reveal that giant planets appear to form more frequently in wide orbits than in close-in orbits around low-mass and lower metallicity stars.
title	The CARMENES search for exoplanets around M dwarfs. Revisiting the GJ 317, GJ 463, and GJ 3512 systems and two newly discovered planets orbiting GJ 9773 and GJ 508.2
topic	Earth and Planetary Astrophysics
url	https://arxiv.org/abs/2507.15516