A search for transit timing variations and orbital decay in WASP-46b

We present 12 new transit observations of the exoplanet WASP-46b obtained with the 1.54-m telescope at Estación Astrofísica de Bosque Alegre (EABA, Argentina) and the 0.40-m Horacio Ghielmetti and 2.15-m Jorge Sahade telescopes at Complejo Astronómico El Leoncito (CASLEO, Argentina). We analyse them...

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Detalles Bibliográficos
Publicado: 2018
Materias:
Planets and satellites: individual: WASP-46b
Stars: individual: WASP-46
Techniques: photometric
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v473_n4_p5126_Petrucci
http://hdl.handle.net/20.500.12110/paper_00358711_v473_n4_p5126_Petrucci
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00358711_v473_n4_p5126_Petrucci
record_format dspace
spelling paper:paper_00358711_v473_n4_p5126_Petrucci2023-06-08T15:01:48Z A search for transit timing variations and orbital decay in WASP-46b Planets and satellites: individual: WASP-46b Stars: individual: WASP-46 Techniques: photometric We present 12 new transit observations of the exoplanet WASP-46b obtained with the 1.54-m telescope at Estación Astrofísica de Bosque Alegre (EABA, Argentina) and the 0.40-m Horacio Ghielmetti and 2.15-m Jorge Sahade telescopes at Complejo Astronómico El Leoncito (CASLEO, Argentina). We analyse them together with 37 light curves from the literature to re-determine the physical parameters and search for additional planets via transit timing variations (TTVs). We consider the 31 transits with uncertainties in their mid-transit times (eT0) < 1 min, to perform the first homogeneous study of TTVs for the system, finding a dispersion of σ = 1.66 min over a 6 yr baseline. Since no periodic variations are found, our interpretation for this relatively high value of σ is that the stellar activity could be affecting the measured mid-transit times. This value of dispersion allows us to rule out the presence of additional bodies with masses larger than 2.3, 4.6, 7 and 9.3 M⊕ at the first-order meanmotion resonances 2:1, 3:2, 4:3 and 5:4 with the transiting planet, respectively. Despite the 6 yr baseline and a typical light-curve precision of 2 ×10-3, we find that we cannot significantly demonstrate a slow decrease of the orbital period of WASP-46b. We place a lower limit of Q* > 7 × 103 on the tidal quality factor and determine that an additional 6 yr baseline is required to rule out Q* < 105. © 2016 The Authors. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v473_n4_p5126_Petrucci http://hdl.handle.net/20.500.12110/paper_00358711_v473_n4_p5126_Petrucci
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: individual: WASP-46b
Stars: individual: WASP-46
Techniques: photometric
spellingShingle Planets and satellites: individual: WASP-46b
Stars: individual: WASP-46
Techniques: photometric
A search for transit timing variations and orbital decay in WASP-46b
topic_facet Planets and satellites: individual: WASP-46b
Stars: individual: WASP-46
Techniques: photometric
description We present 12 new transit observations of the exoplanet WASP-46b obtained with the 1.54-m telescope at Estación Astrofísica de Bosque Alegre (EABA, Argentina) and the 0.40-m Horacio Ghielmetti and 2.15-m Jorge Sahade telescopes at Complejo Astronómico El Leoncito (CASLEO, Argentina). We analyse them together with 37 light curves from the literature to re-determine the physical parameters and search for additional planets via transit timing variations (TTVs). We consider the 31 transits with uncertainties in their mid-transit times (eT0) < 1 min, to perform the first homogeneous study of TTVs for the system, finding a dispersion of σ = 1.66 min over a 6 yr baseline. Since no periodic variations are found, our interpretation for this relatively high value of σ is that the stellar activity could be affecting the measured mid-transit times. This value of dispersion allows us to rule out the presence of additional bodies with masses larger than 2.3, 4.6, 7 and 9.3 M⊕ at the first-order meanmotion resonances 2:1, 3:2, 4:3 and 5:4 with the transiting planet, respectively. Despite the 6 yr baseline and a typical light-curve precision of 2 ×10-3, we find that we cannot significantly demonstrate a slow decrease of the orbital period of WASP-46b. We place a lower limit of Q* > 7 × 103 on the tidal quality factor and determine that an additional 6 yr baseline is required to rule out Q* < 105. © 2016 The Authors.
title A search for transit timing variations and orbital decay in WASP-46b
title_short A search for transit timing variations and orbital decay in WASP-46b
title_full A search for transit timing variations and orbital decay in WASP-46b
title_fullStr A search for transit timing variations and orbital decay in WASP-46b
title_full_unstemmed A search for transit timing variations and orbital decay in WASP-46b
title_sort search for transit timing variations and orbital decay in wasp-46b
publishDate 2018
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v473_n4_p5126_Petrucci
http://hdl.handle.net/20.500.12110/paper_00358711_v473_n4_p5126_Petrucci
_version_ 1768544947783335936

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