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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. (...) Udry, S. "Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements" (2018) Astronomy and Astrophysics. 619
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Abstract:

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.

Registro:

Documento: Artículo
Título:Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements
Autor: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.
Filiación:Institut für Astrophysik, Georg-August Universität Göttingen, Friedrich-Hund-Platz 1, Göttingen, 37077, Germany
Instituto de Astrofísica e Ciências Do Espaço, Universidade Do Porto, Rua das Estrelas, Porto, 4150-762, Portugal
University of Birmingham, Edgbaston, Birmingham, B152TT, United Kingdom
Université de Liège, Alleé du 6 Août 17, Liège, 4000, Belgium
European Southern Observatory, Alonso de Cordova 3107 Vitacura Casilla, Santiago, 19001, Chile
Departamento de Física e Astronomia, Faculdade de Ciências, Universidade Do Porto, Rua do Campo Alegre4169-007, Portugal
IMCCE, Observatoire de Paris, UPMC University Paris, Paris, France
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires, 1428, Argentina
CONICET, Universidad de Buenos Aires, Instituto de Astronomiá y Física Del Espacio, Buenos Aires, 1428, Argentina
Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge, CB30HE, United Kingdom
Hamburg Observatory, Hamburg University, Gojenbergsweg 112, Hamburg, 21029, Germany
Max Planck Institute for Astronomy, Königstuhl 17, Heidelberg, 69117, Germany
Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, Versoix, 1290, Switzerland
Palabras clave: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
Año:2018
Volumen:619
DOI: http://dx.doi.org/10.1051/0004-6361/201833709
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v619_n_p_Oshagh

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Citas:

---------- APA ----------
Oshagh, M., Triaud, A.H.M.J., Burdanov, A., Figueira, P., Reiners, A., Santos, N.C., Faria, J.,..., Udry, S. (2018) . Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements. Astronomy and Astrophysics, 619.
http://dx.doi.org/10.1051/0004-6361/201833709
---------- CHICAGO ----------
Oshagh, M., Triaud, A.H.M.J., Burdanov, A., Figueira, P., Reiners, A., Santos, N.C., et al. "Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements" . Astronomy and Astrophysics 619 (2018).
http://dx.doi.org/10.1051/0004-6361/201833709
---------- MLA ----------
Oshagh, M., Triaud, A.H.M.J., Burdanov, A., Figueira, P., Reiners, A., Santos, N.C., et al. "Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements" . Astronomy and Astrophysics, vol. 619, 2018.
http://dx.doi.org/10.1051/0004-6361/201833709
---------- VANCOUVER ----------
Oshagh, M., Triaud, A.H.M.J., Burdanov, A., Figueira, P., Reiners, A., Santos, N.C., et al. Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements. Astron. Astrophys. 2018;619.
http://dx.doi.org/10.1051/0004-6361/201833709