Buchumschlag

The K2-24 planetary system revisited by CHEOPS

Fuente: arXiv

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Bibliographische Detailangaben
Hauptverfasser:	Nascimbeni, V., Borsato, L., Leonardi, P., Sousa, S. G., Wilson, T. G., Fortier, A., Heitzmann, A., Mantovan, G., Luque, R., Zingales, T., Piotto, G., Alibert, Y., Alonso, R., Bárczy, T., Navascues, D. Barrado, Barros, S. C., Baumjohann, W., Beck, T., Benz, W., Billot, N., Biondi, F., Brandeker, A., Broeg, C., Busch, M. -D., Cameron, A. Collier, Correia, A. C. M., Csizmadia, Sz., Cubillos, P. E., Davies, M. B., Deleuil, M., Deline, A., Delrez, L., Demangeon, O. D. S., Demory, B. -O., Derekas, A., Edwards, B., Ehrenreich, D., Erikson, A., Fossati, L., Fridlund, M., Gandolfi, D., Gazeas, K., Gillon, M., Güdel, M., Günther, M. N., Helling, Ch., Isaak, K. G., Kerschbaum, F., Kiss, L., Korth, J., Lam, K. W. F., Laskar, J., Etangs, A. Lecavelier des, Leleu, A., Lendl, M., Magrin, D., Maxted, P. F. L., Merín, B., Mordasini, C., Olofsson, G., Ottensamer, R., Pagano, I., Pallé, E., Peter, G., Pollacco, D., Queloz, D., Ragazzoni, R., Rando, N., Rauer, H., Ribas, I., Santos, N. C., Scandariato, G., Ségransan, D., Simon, A. E., Smith, A. M. S., Southworth, R., Stalport, M., Sulis, S., Szabó, M. Gy., Udry, S., Ulmer, B., Van Grootel, V., Venturini, J., Villaver, E., Walton, N. A.
Format:	Preprint
Veröffentlicht:	2024
Schlagworte:	Earth and Planetary Astrophysics Solar and Stellar Astrophysics
Online-Zugang:	Acceder al recurso
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_version_	1866914982739836928
author	Nascimbeni, V. Borsato, L. Leonardi, P. Sousa, S. G. Wilson, T. G. Fortier, A. Heitzmann, A. Mantovan, G. Luque, R. Zingales, T. Piotto, G. Alibert, Y. Alonso, R. Bárczy, T. Navascues, D. Barrado Barros, S. C. Baumjohann, W. Beck, T. Benz, W. Billot, N. Biondi, F. Brandeker, A. Broeg, C. Busch, M. -D. Cameron, A. Collier Correia, A. C. M. Csizmadia, Sz. Cubillos, P. E. Davies, M. B. Deleuil, M. Deline, A. Delrez, L. Demangeon, O. D. S. Demory, B. -O. Derekas, A. Edwards, B. Ehrenreich, D. Erikson, A. Fossati, L. Fridlund, M. Gandolfi, D. Gazeas, K. Gillon, M. Güdel, M. Günther, M. N. Helling, Ch. Isaak, K. G. Kerschbaum, F. Kiss, L. Korth, J. Lam, K. W. F. Laskar, J. Etangs, A. Lecavelier des Leleu, A. Lendl, M. Magrin, D. Maxted, P. F. L. Merín, B. Mordasini, C. Olofsson, G. Ottensamer, R. Pagano, I. Pallé, E. Peter, G. Pollacco, D. Queloz, D. Ragazzoni, R. Rando, N. Rauer, H. Ribas, I. Santos, N. C. Scandariato, G. Ségransan, D. Simon, A. E. Smith, A. M. S. Southworth, R. Stalport, M. Sulis, S. Szabó, M. Gy. Udry, S. Ulmer, B. Van Grootel, V. Venturini, J. Villaver, E. Walton, N. A.
author_facet	Nascimbeni, V. Borsato, L. Leonardi, P. Sousa, S. G. Wilson, T. G. Fortier, A. Heitzmann, A. Mantovan, G. Luque, R. Zingales, T. Piotto, G. Alibert, Y. Alonso, R. Bárczy, T. Navascues, D. Barrado Barros, S. C. Baumjohann, W. Beck, T. Benz, W. Billot, N. Biondi, F. Brandeker, A. Broeg, C. Busch, M. -D. Cameron, A. Collier Correia, A. C. M. Csizmadia, Sz. Cubillos, P. E. Davies, M. B. Deleuil, M. Deline, A. Delrez, L. Demangeon, O. D. S. Demory, B. -O. Derekas, A. Edwards, B. Ehrenreich, D. Erikson, A. Fossati, L. Fridlund, M. Gandolfi, D. Gazeas, K. Gillon, M. Güdel, M. Günther, M. N. Helling, Ch. Isaak, K. G. Kerschbaum, F. Kiss, L. Korth, J. Lam, K. W. F. Laskar, J. Etangs, A. Lecavelier des Leleu, A. Lendl, M. Magrin, D. Maxted, P. F. L. Merín, B. Mordasini, C. Olofsson, G. Ottensamer, R. Pagano, I. Pallé, E. Peter, G. Pollacco, D. Queloz, D. Ragazzoni, R. Rando, N. Rauer, H. Ribas, I. Santos, N. C. Scandariato, G. Ségransan, D. Simon, A. E. Smith, A. M. S. Southworth, R. Stalport, M. Sulis, S. Szabó, M. Gy. Udry, S. Ulmer, B. Van Grootel, V. Venturini, J. Villaver, E. Walton, N. A.
contents	K2-24 is a planetary system composed of two transiting low-density Neptunians locked in an almost perfect 2:1 resonance and showing large TTVs, i.e., an excellent laboratory to search for signatures of planetary migration. Previous studies performed with K2, Spitzer and RV data tentatively claimed a significant non-zero eccentricity for one or both planets, possibly high enough to challenge the scenario of pure disk migration through resonant capture. With 13 new CHEOPS light curves (seven of planet -b, six of planet -c), we carried out a global photometric and dynamical re-analysis by including all the available literature data as well. We got the most accurate set of planetary parameters to date for the K2-24 system, including radii and masses at 1% and 5% precision (now essentially limited by the uncertainty on stellar parameters) and non-zero eccentricities $e_b=0.0498_{-0.0018}^{+0.0011}$, $e_c=0.0282_{-0.0007}^{+0.0003}$ detected at very high significance for both planets. Such relatively large values imply the need for an additional physical mechanism of eccentricity excitation during or after the migration stage. Also, while the accuracy of the previous TTV model had drifted by up to 0.5 days at the current time, we constrained the orbital solution firmly enough to predict the forthcoming transits for the next ~15 years, thus enabling an efficient follow-up with top-level facilities such as JWST or ESPRESSO.
format	Preprint
id	arxiv_https___arxiv_org_abs_2409_02995
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	The K2-24 planetary system revisited by CHEOPS Nascimbeni, V. Borsato, L. Leonardi, P. Sousa, S. G. Wilson, T. G. Fortier, A. Heitzmann, A. Mantovan, G. Luque, R. Zingales, T. Piotto, G. Alibert, Y. Alonso, R. Bárczy, T. Navascues, D. Barrado Barros, S. C. Baumjohann, W. Beck, T. Benz, W. Billot, N. Biondi, F. Brandeker, A. Broeg, C. Busch, M. -D. Cameron, A. Collier Correia, A. C. M. Csizmadia, Sz. Cubillos, P. E. Davies, M. B. Deleuil, M. Deline, A. Delrez, L. Demangeon, O. D. S. Demory, B. -O. Derekas, A. Edwards, B. Ehrenreich, D. Erikson, A. Fossati, L. Fridlund, M. Gandolfi, D. Gazeas, K. Gillon, M. Güdel, M. Günther, M. N. Helling, Ch. Isaak, K. G. Kerschbaum, F. Kiss, L. Korth, J. Lam, K. W. F. Laskar, J. Etangs, A. Lecavelier des Leleu, A. Lendl, M. Magrin, D. Maxted, P. F. L. Merín, B. Mordasini, C. Olofsson, G. Ottensamer, R. Pagano, I. Pallé, E. Peter, G. Pollacco, D. Queloz, D. Ragazzoni, R. Rando, N. Rauer, H. Ribas, I. Santos, N. C. Scandariato, G. Ségransan, D. Simon, A. E. Smith, A. M. S. Southworth, R. Stalport, M. Sulis, S. Szabó, M. Gy. Udry, S. Ulmer, B. Van Grootel, V. Venturini, J. Villaver, E. Walton, N. A. Earth and Planetary Astrophysics Solar and Stellar Astrophysics K2-24 is a planetary system composed of two transiting low-density Neptunians locked in an almost perfect 2:1 resonance and showing large TTVs, i.e., an excellent laboratory to search for signatures of planetary migration. Previous studies performed with K2, Spitzer and RV data tentatively claimed a significant non-zero eccentricity for one or both planets, possibly high enough to challenge the scenario of pure disk migration through resonant capture. With 13 new CHEOPS light curves (seven of planet -b, six of planet -c), we carried out a global photometric and dynamical re-analysis by including all the available literature data as well. We got the most accurate set of planetary parameters to date for the K2-24 system, including radii and masses at 1% and 5% precision (now essentially limited by the uncertainty on stellar parameters) and non-zero eccentricities $e_b=0.0498_{-0.0018}^{+0.0011}$, $e_c=0.0282_{-0.0007}^{+0.0003}$ detected at very high significance for both planets. Such relatively large values imply the need for an additional physical mechanism of eccentricity excitation during or after the migration stage. Also, while the accuracy of the previous TTV model had drifted by up to 0.5 days at the current time, we constrained the orbital solution firmly enough to predict the forthcoming transits for the next ~15 years, thus enabling an efficient follow-up with top-level facilities such as JWST or ESPRESSO.
title	The K2-24 planetary system revisited by CHEOPS
topic	Earth and Planetary Astrophysics Solar and Stellar Astrophysics
url	https://arxiv.org/abs/2409.02995