Star-spot activity, orbital obliquity, transmission spectrum, physical properties, and TTVs of the HATS-2 planetary system

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Hauptverfasser:	Biagiotti, F., Mancini, L., Southworth, J., Tregloan-Reed, J., Naponiello, L., Jørgensen, U. G., Bach-Møller, N., Basilicata, M., Bonavita, M., Bozza, V., Burgdorf, M. J., Dominik, M., Jaimes, R. Figuera, Henning, Th., Hinse, T. C., Hundertmark, M., Khalouei, E., Longa-Peña, P., Peixinho, N., Rabus, M., Rahvar, S., Sajadian, S., Skottfelt, J., Snodgrass, C., Jongen, Y., Vignes, J. -P.
Format:	Preprint
Veröffentlicht:	2024
Schlagworte:	Earth and Planetary Astrophysics Solar and Stellar Astrophysics
Online-Zugang:	Acceder al recurso
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_version_	1866909131397398528
author	Biagiotti, F. Mancini, L. Southworth, J. Tregloan-Reed, J. Naponiello, L. Jørgensen, U. G. Bach-Møller, N. Basilicata, M. Bonavita, M. Bozza, V. Burgdorf, M. J. Dominik, M. Jaimes, R. Figuera Henning, Th. Hinse, T. C. Hundertmark, M. Khalouei, E. Longa-Peña, P. Peixinho, N. Rabus, M. Rahvar, S. Sajadian, S. Skottfelt, J. Snodgrass, C. Jongen, Y. Vignes, J. -P.
author_facet	Biagiotti, F. Mancini, L. Southworth, J. Tregloan-Reed, J. Naponiello, L. Jørgensen, U. G. Bach-Møller, N. Basilicata, M. Bonavita, M. Bozza, V. Burgdorf, M. J. Dominik, M. Jaimes, R. Figuera Henning, Th. Hinse, T. C. Hundertmark, M. Khalouei, E. Longa-Peña, P. Peixinho, N. Rabus, M. Rahvar, S. Sajadian, S. Skottfelt, J. Snodgrass, C. Jongen, Y. Vignes, J. -P.
contents	Our aim in this paper is to refine the orbital and physical parameters of the HATS-2 planetary system and study transit timing variations and atmospheric composition thanks to transit observations that span more than ten years and that were collected using different instruments and pass-band filters. We also investigate the orbital alignment of the system by studying the anomalies in the transit light curves induced by starspots on the photosphere of the parent star. We analysed new transit events from both ground-based telescopes and NASA's TESS mission. Anomalies were detected in most of the light curves and modelled as starspots occulted by the planet during transit events. We fitted the clean and symmetric light curves with the JKTEBOP code and those affected by anomalies with the PRISM+GEMC codes to simultaneously model the photometric parameters of the transits and the position, size, and contrast of each starspot. We found consistency between the values we found for the physical and orbital parameters and those from the discovery paper and ATLAS9 stellar atmospherical models. We identified different sets of consecutive starspot-crossing events that temporally occurred in less than five days. Under the hypothesis that we are dealing with the same starspots, occulted twice by the planet during two consecutive transits, we estimated the rotational period of the parent star and, in turn the projected and the true orbital obliquity of the planet. We find that the system is well aligned. We identified the possible presence of transit timing variations in the system, which can be caused by tidal orbital decay, and we derived a low-resolution transmission spectrum.
format	Preprint
id	arxiv_https___arxiv_org_abs_2403_04476
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Star-spot activity, orbital obliquity, transmission spectrum, physical properties, and TTVs of the HATS-2 planetary system Biagiotti, F. Mancini, L. Southworth, J. Tregloan-Reed, J. Naponiello, L. Jørgensen, U. G. Bach-Møller, N. Basilicata, M. Bonavita, M. Bozza, V. Burgdorf, M. J. Dominik, M. Jaimes, R. Figuera Henning, Th. Hinse, T. C. Hundertmark, M. Khalouei, E. Longa-Peña, P. Peixinho, N. Rabus, M. Rahvar, S. Sajadian, S. Skottfelt, J. Snodgrass, C. Jongen, Y. Vignes, J. -P. Earth and Planetary Astrophysics Solar and Stellar Astrophysics Our aim in this paper is to refine the orbital and physical parameters of the HATS-2 planetary system and study transit timing variations and atmospheric composition thanks to transit observations that span more than ten years and that were collected using different instruments and pass-band filters. We also investigate the orbital alignment of the system by studying the anomalies in the transit light curves induced by starspots on the photosphere of the parent star. We analysed new transit events from both ground-based telescopes and NASA's TESS mission. Anomalies were detected in most of the light curves and modelled as starspots occulted by the planet during transit events. We fitted the clean and symmetric light curves with the JKTEBOP code and those affected by anomalies with the PRISM+GEMC codes to simultaneously model the photometric parameters of the transits and the position, size, and contrast of each starspot. We found consistency between the values we found for the physical and orbital parameters and those from the discovery paper and ATLAS9 stellar atmospherical models. We identified different sets of consecutive starspot-crossing events that temporally occurred in less than five days. Under the hypothesis that we are dealing with the same starspots, occulted twice by the planet during two consecutive transits, we estimated the rotational period of the parent star and, in turn the projected and the true orbital obliquity of the planet. We find that the system is well aligned. We identified the possible presence of transit timing variations in the system, which can be caused by tidal orbital decay, and we derived a low-resolution transmission spectrum.
title	Star-spot activity, orbital obliquity, transmission spectrum, physical properties, and TTVs of the HATS-2 planetary system
topic	Earth and Planetary Astrophysics Solar and Stellar Astrophysics
url	https://arxiv.org/abs/2403.04476