Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements

One of the most powerful methods used to estimate sky-projected spin-orbit angles of exoplanetary systems is through a spectroscopic transit observation known as the RossiterMcLaughlin (RM) effect. So far mostly single RM observations have been used to estimate the spin-orbit angle, and thus there h...

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Autores principales:	Oshagh, M., Triaud, A.H.M.J., Burdanov, A., Figueira, P., Reiners, A., Santos, N.C., Faria, J., Boue, G., Diáz, R.F., Dreizler, S., Boldt, S., Delrez, L., Ducrot, E., Gillon, M., Guzman Mesa, A., Jehin, E., Khalafinejad, S., Kohl, S., Serrano, L., Udry, S.
Formato:	JOUR
Materias:	Planets and satellites: Detection Planets and satellites: Fundamental parameters Stars: Activity Starspots Techniques: Photometric Techniques: Radial velocities Astrophysics Photometry Planets Satellites Stars Planets and satellites: detections Planets and satellites: fundamental parameters Stars: activity Techniques: photometric Techniques: radial velocities Orbits
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00046361_v619_n_p_Oshagh
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00046361_v619_n_p_Oshagh
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spelling	todo:paper_00046361_v619_n_p_Oshagh2023-10-03T14:01:22Z Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements Oshagh, M. Triaud, A.H.M.J. Burdanov, A. Figueira, P. Reiners, A. Santos, N.C. Faria, J. Boue, G. Diáz, R.F. Dreizler, S. Boldt, S. Delrez, L. Ducrot, E. Gillon, M. Guzman Mesa, A. Jehin, E. Khalafinejad, S. Kohl, S. Serrano, L. Udry, S. Planets and satellites: Detection Planets and satellites: Fundamental parameters Stars: Activity Starspots Techniques: Photometric Techniques: Radial velocities Astrophysics Photometry Planets Satellites Stars Planets and satellites: detections Planets and satellites: fundamental parameters Stars: activity Starspots Techniques: photometric Techniques: radial velocities Orbits One of the most powerful methods used to estimate sky-projected spin-orbit angles of exoplanetary systems is through a spectroscopic transit observation known as the RossiterMcLaughlin (RM) effect. So far mostly single RM observations have been used to estimate the spin-orbit angle, and thus there have been no studies regarding the variation of estimated spin-orbit angle from transit to transit. Stellar activity can alter the shape of photometric transit light curves and in a similar way they can deform the RM signal. In this paper we present several RM observations, obtained using the HARPS spectrograph, of known transiting planets that all transit extremely active stars, and by analyzing them individually we assess the variation in the estimated spin-orbit angle. Our results reveal that the estimated spin-orbit angle can vary significantly (up to ∼42°) from transit to transit, due to variation in the configuration of stellar active regions over different nights. This finding is almost two times larger than the expected variation predicted from simulations. We could not identify any meaningful correlation between the variation of estimated spin-orbit angles and the stellar magnetic activity indicators. We also investigated two possible approaches to mitigate the stellar activity influence on RM observations. The first strategy was based on obtaining several RM observations and folding them to reduce the stellar activity noise. Our results demonstrated that this is a feasible and robust way to overcome this issue. The second approach is based on acquiring simultaneous high-precision short-cadence photometric transit light curves using TRAPPIST/SPECULOOS telescopes, which provide more information about the stellar active region's properties and allow a better RM modeling. © 2018 ESO. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v619_n_p_Oshagh
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Planets and satellites: Detection Planets and satellites: Fundamental parameters Stars: Activity Starspots Techniques: Photometric Techniques: Radial velocities Astrophysics Photometry Planets Satellites Stars Planets and satellites: detections Planets and satellites: fundamental parameters Stars: activity Starspots Techniques: photometric Techniques: radial velocities Orbits
spellingShingle	Planets and satellites: Detection Planets and satellites: Fundamental parameters Stars: Activity Starspots Techniques: Photometric Techniques: Radial velocities Astrophysics Photometry Planets Satellites Stars Planets and satellites: detections Planets and satellites: fundamental parameters Stars: activity Starspots Techniques: photometric Techniques: radial velocities Orbits Oshagh, M. Triaud, A.H.M.J. Burdanov, A. Figueira, P. Reiners, A. Santos, N.C. Faria, J. Boue, G. Diáz, R.F. Dreizler, S. Boldt, S. Delrez, L. Ducrot, E. Gillon, M. Guzman Mesa, A. Jehin, E. Khalafinejad, S. Kohl, S. Serrano, L. Udry, S. Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements
topic_facet	Planets and satellites: Detection Planets and satellites: Fundamental parameters Stars: Activity Starspots Techniques: Photometric Techniques: Radial velocities Astrophysics Photometry Planets Satellites Stars Planets and satellites: detections Planets and satellites: fundamental parameters Stars: activity Starspots Techniques: photometric Techniques: radial velocities Orbits
description	One of the most powerful methods used to estimate sky-projected spin-orbit angles of exoplanetary systems is through a spectroscopic transit observation known as the RossiterMcLaughlin (RM) effect. So far mostly single RM observations have been used to estimate the spin-orbit angle, and thus there have been no studies regarding the variation of estimated spin-orbit angle from transit to transit. Stellar activity can alter the shape of photometric transit light curves and in a similar way they can deform the RM signal. In this paper we present several RM observations, obtained using the HARPS spectrograph, of known transiting planets that all transit extremely active stars, and by analyzing them individually we assess the variation in the estimated spin-orbit angle. Our results reveal that the estimated spin-orbit angle can vary significantly (up to ∼42°) from transit to transit, due to variation in the configuration of stellar active regions over different nights. This finding is almost two times larger than the expected variation predicted from simulations. We could not identify any meaningful correlation between the variation of estimated spin-orbit angles and the stellar magnetic activity indicators. We also investigated two possible approaches to mitigate the stellar activity influence on RM observations. The first strategy was based on obtaining several RM observations and folding them to reduce the stellar activity noise. Our results demonstrated that this is a feasible and robust way to overcome this issue. The second approach is based on acquiring simultaneous high-precision short-cadence photometric transit light curves using TRAPPIST/SPECULOOS telescopes, which provide more information about the stellar active region's properties and allow a better RM modeling. © 2018 ESO.
format	JOUR
author	Oshagh, M. Triaud, A.H.M.J. Burdanov, A. Figueira, P. Reiners, A. Santos, N.C. Faria, J. Boue, G. Diáz, R.F. Dreizler, S. Boldt, S. Delrez, L. Ducrot, E. Gillon, M. Guzman Mesa, A. Jehin, E. Khalafinejad, S. Kohl, S. Serrano, L. Udry, S.
author_facet	Oshagh, M. Triaud, A.H.M.J. Burdanov, A. Figueira, P. Reiners, A. Santos, N.C. Faria, J. Boue, G. Diáz, R.F. Dreizler, S. Boldt, S. Delrez, L. Ducrot, E. Gillon, M. Guzman Mesa, A. Jehin, E. Khalafinejad, S. Kohl, S. Serrano, L. Udry, S.
author_sort	Oshagh, M.
title	Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements
title_short	Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements
title_full	Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements
title_fullStr	Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements
title_full_unstemmed	Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements
title_sort	activity induced variation in spin-orbit angles as derived from rossiter-mclaughlin measurements
url	http://hdl.handle.net/20.500.12110/paper_00046361_v619_n_p_Oshagh
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Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements

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