Buchumschlag

CHEOPS observations confirm nodal precession in the WASP-33 system

Fuente: arXiv

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Bibliographische Detailangaben
Hauptverfasser:	Smith, A. M. S., Csizmadia, Sz., Van Grootel, V., Lendl, M., Persson, C. M., Olofsson, G., Ehrenreich, D., Günther, M. N., Heitzmann, A., Barros, S. C. C., Bonfanti, A., Brandeker, A., Cabrera, J., Demangeon, O. D. S., Fossati, L., Harre, J. -V., Hooton, M. J., Hoyer, S., Kalman, Sz., Salmon, S., Sousa, S. G., Szabó, Gy. M., Wilson, T. G., Alibert, Y., Alonso, R., Asquier, J., Bárczy, T., Barrado, D., Baumjohann, W., Benz, W., Billot, N., Borsato, L., Broeg, C., Cameron, A. Collier, Correia, A. C. M., Cubillos, P. E., Davies, M. B., Deleuil, M., Deline, A., Demory, B. -O., Derekas, A., Edwards, B., Egger, J. A., Erikson, A., Fortier, A., Fridlund, M., Gandolfi, D., Gazeas, K., Gillon, M., Güdel, M., Hasiba, J., Helling, Ch., Isaak, K. G., Kiss, L. L., Korth, J., Lam, K. W. F., Laskar, J., Etangs, A. Lecavelier des, Magrin, D., Maxted, P. F. L., Merín, B., Mordasini, C., Nascimbeni, V., Ottensamer, R., Pagano, I., Pallé, E., Peter, G., Piazza, D., Piotto, G., Pollacco, D., Queloz, D., Ragazzoni, R., Rando, N., Rauer, H., Ribas, I., Santos, N. C., Scandariato, G., Ségransan, D., Simon, A. E., Stalport, M., Sulis, S., Udry, S., Ulmer-Moll, S., Venturini, J., Villaver, E., Viotto, V., Walter, I., Walton, N. A., Wolf, S.
Format:	Preprint
Veröffentlicht:	2024
Schlagworte:	Earth and Planetary Astrophysics Solar and Stellar Astrophysics
Online-Zugang:	Acceder al recurso
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author	Smith, A. M. S. Csizmadia, Sz. Van Grootel, V. Lendl, M. Persson, C. M. Olofsson, G. Ehrenreich, D. Günther, M. N. Heitzmann, A. Barros, S. C. C. Bonfanti, A. Brandeker, A. Cabrera, J. Demangeon, O. D. S. Fossati, L. Harre, J. -V. Hooton, M. J. Hoyer, S. Kalman, Sz. Salmon, S. Sousa, S. G. Szabó, Gy. M. Wilson, T. G. Alibert, Y. Alonso, R. Asquier, J. Bárczy, T. Barrado, D. Baumjohann, W. Benz, W. Billot, N. Borsato, L. Broeg, C. Cameron, A. Collier Correia, A. C. M. Cubillos, P. E. Davies, M. B. Deleuil, M. Deline, A. Demory, B. -O. Derekas, A. Edwards, B. Egger, J. A. Erikson, A. Fortier, A. Fridlund, M. Gandolfi, D. Gazeas, K. Gillon, M. Güdel, M. Hasiba, J. Helling, Ch. Isaak, K. G. Kiss, L. L. Korth, J. Lam, K. W. F. Laskar, J. Etangs, A. Lecavelier des Magrin, D. Maxted, P. F. L. Merín, B. Mordasini, C. Nascimbeni, V. Ottensamer, R. Pagano, I. Pallé, E. Peter, G. Piazza, D. Piotto, G. Pollacco, D. Queloz, D. Ragazzoni, R. Rando, N. Rauer, H. Ribas, I. Santos, N. C. Scandariato, G. Ségransan, D. Simon, A. E. Stalport, M. Sulis, S. Udry, S. Ulmer-Moll, S. Venturini, J. Villaver, E. Viotto, V. Walter, I. Walton, N. A. Wolf, S.
author_facet	Smith, A. M. S. Csizmadia, Sz. Van Grootel, V. Lendl, M. Persson, C. M. Olofsson, G. Ehrenreich, D. Günther, M. N. Heitzmann, A. Barros, S. C. C. Bonfanti, A. Brandeker, A. Cabrera, J. Demangeon, O. D. S. Fossati, L. Harre, J. -V. Hooton, M. J. Hoyer, S. Kalman, Sz. Salmon, S. Sousa, S. G. Szabó, Gy. M. Wilson, T. G. Alibert, Y. Alonso, R. Asquier, J. Bárczy, T. Barrado, D. Baumjohann, W. Benz, W. Billot, N. Borsato, L. Broeg, C. Cameron, A. Collier Correia, A. C. M. Cubillos, P. E. Davies, M. B. Deleuil, M. Deline, A. Demory, B. -O. Derekas, A. Edwards, B. Egger, J. A. Erikson, A. Fortier, A. Fridlund, M. Gandolfi, D. Gazeas, K. Gillon, M. Güdel, M. Hasiba, J. Helling, Ch. Isaak, K. G. Kiss, L. L. Korth, J. Lam, K. W. F. Laskar, J. Etangs, A. Lecavelier des Magrin, D. Maxted, P. F. L. Merín, B. Mordasini, C. Nascimbeni, V. Ottensamer, R. Pagano, I. Pallé, E. Peter, G. Piazza, D. Piotto, G. Pollacco, D. Queloz, D. Ragazzoni, R. Rando, N. Rauer, H. Ribas, I. Santos, N. C. Scandariato, G. Ségransan, D. Simon, A. E. Stalport, M. Sulis, S. Udry, S. Ulmer-Moll, S. Venturini, J. Villaver, E. Viotto, V. Walter, I. Walton, N. A. Wolf, S.
contents	Aims: We aim to observe the transits and occultations of WASP-33b, which orbits a rapidly-rotating $δ$ Scuti pulsator, with the goal of measuring the orbital obliquity via the gravity-darkening effect, and constraining the geometric albedo via the occultation depth. Methods: We observed four transits and four occultations with CHEOPS, and employ a variety of techniques to remove the effects of the stellar pulsations from the light curves, as well as the usual CHEOPS systematic effects. We also performed a comprehensive analysis of low-resolution spectral and Gaia data to re-determine the stellar properties of WASP-33. Results: We measure an orbital obliquity 111.3 +0.2 -0.7 degrees, which is consistent with previous measurements made via Doppler tomography. We also measure the planetary impact parameter, and confirm that this parameter is undergoing rapid secular evolution as a result of nodal precession of the planetary orbit. This precession allows us to determine the second-order fluid Love number of the star, which we find agrees well with the predictions of theoretical stellar models. We are unable to robustly measure a unique value of the occultation depth, and emphasise the need for long-baseline observations to better measure the pulsation periods.
format	Preprint
id	arxiv_https___arxiv_org_abs_2412_08557
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	CHEOPS observations confirm nodal precession in the WASP-33 system Smith, A. M. S. Csizmadia, Sz. Van Grootel, V. Lendl, M. Persson, C. M. Olofsson, G. Ehrenreich, D. Günther, M. N. Heitzmann, A. Barros, S. C. C. Bonfanti, A. Brandeker, A. Cabrera, J. Demangeon, O. D. S. Fossati, L. Harre, J. -V. Hooton, M. J. Hoyer, S. Kalman, Sz. Salmon, S. Sousa, S. G. Szabó, Gy. M. Wilson, T. G. Alibert, Y. Alonso, R. Asquier, J. Bárczy, T. Barrado, D. Baumjohann, W. Benz, W. Billot, N. Borsato, L. Broeg, C. Cameron, A. Collier Correia, A. C. M. Cubillos, P. E. Davies, M. B. Deleuil, M. Deline, A. Demory, B. -O. Derekas, A. Edwards, B. Egger, J. A. Erikson, A. Fortier, A. Fridlund, M. Gandolfi, D. Gazeas, K. Gillon, M. Güdel, M. Hasiba, J. Helling, Ch. Isaak, K. G. Kiss, L. L. Korth, J. Lam, K. W. F. Laskar, J. Etangs, A. Lecavelier des Magrin, D. Maxted, P. F. L. Merín, B. Mordasini, C. Nascimbeni, V. Ottensamer, R. Pagano, I. Pallé, E. Peter, G. Piazza, D. Piotto, G. Pollacco, D. Queloz, D. Ragazzoni, R. Rando, N. Rauer, H. Ribas, I. Santos, N. C. Scandariato, G. Ségransan, D. Simon, A. E. Stalport, M. Sulis, S. Udry, S. Ulmer-Moll, S. Venturini, J. Villaver, E. Viotto, V. Walter, I. Walton, N. A. Wolf, S. Earth and Planetary Astrophysics Solar and Stellar Astrophysics Aims: We aim to observe the transits and occultations of WASP-33b, which orbits a rapidly-rotating $δ$ Scuti pulsator, with the goal of measuring the orbital obliquity via the gravity-darkening effect, and constraining the geometric albedo via the occultation depth. Methods: We observed four transits and four occultations with CHEOPS, and employ a variety of techniques to remove the effects of the stellar pulsations from the light curves, as well as the usual CHEOPS systematic effects. We also performed a comprehensive analysis of low-resolution spectral and Gaia data to re-determine the stellar properties of WASP-33. Results: We measure an orbital obliquity 111.3 +0.2 -0.7 degrees, which is consistent with previous measurements made via Doppler tomography. We also measure the planetary impact parameter, and confirm that this parameter is undergoing rapid secular evolution as a result of nodal precession of the planetary orbit. This precession allows us to determine the second-order fluid Love number of the star, which we find agrees well with the predictions of theoretical stellar models. We are unable to robustly measure a unique value of the occultation depth, and emphasise the need for long-baseline observations to better measure the pulsation periods.
title	CHEOPS observations confirm nodal precession in the WASP-33 system
topic	Earth and Planetary Astrophysics Solar and Stellar Astrophysics
url	https://arxiv.org/abs/2412.08557