Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4

We homogeneously analyse ∼3.2 × 10⁵ photometric measurements for ∼1100 transit lightcurves belonging to 17 exoplanet hosts. The photometric data cover 16 years 2004–2019 and include amateur and professional observations. Old archival lightcurves were reprocessed using up-to-date exoplanetary paramet...

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Detalles Bibliográficos
Autores principales: Fernández Lajús, Eduardo Eusebio, Di Sisto, Romina Paula
Formato: Articulo
Lenguaje:Inglés
Publicado: 2019
Materias:
Ciencias Astronómicas
Planetary systems
Techniques: photometric
Techniques: radial velocities
Methods: data analysis
Methods: statistical
Surveys
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125194
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125194
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Planetary systems
Techniques: photometric
Techniques: radial velocities
Methods: data analysis
Methods: statistical
Surveys
spellingShingle Ciencias Astronómicas
Planetary systems
Techniques: photometric
Techniques: radial velocities
Methods: data analysis
Methods: statistical
Surveys
Fernández Lajús, Eduardo Eusebio
Di Sisto, Romina Paula
Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4
topic_facet Ciencias Astronómicas
Planetary systems
Techniques: photometric
Techniques: radial velocities
Methods: data analysis
Methods: statistical
Surveys
description We homogeneously analyse ∼3.2 × 10⁵ photometric measurements for ∼1100 transit lightcurves belonging to 17 exoplanet hosts. The photometric data cover 16 years 2004–2019 and include amateur and professional observations. Old archival lightcurves were reprocessed using up-to-date exoplanetary parameters and empirically debiased limb-darkening models. We also derive self-consistent transit and radial-velocity fits for 13 targets. We confirm the nonlinear TTV trend in the WASP-12 data at a high significance, and with a consistent magnitude. However, Doppler data reveal hints of a radial acceleration about ( − 7.5 ± 2.2) m/s/yr, indicating the presence of unseen distant companions, and suggesting that roughly 10 per cent of the observed TTV was induced via the light-travel (or Roemer) effect. For WASP-4, a similar TTV trend suspected after the recent TESS observations appears controversial and model-dependent. It is not supported by our homogeneus TTV sample, including 10 ground-based EXPANSION lightcurves obtained in 2018 simultaneously with TESS. Even if the TTV trend itself does exist in WASP-4, its magnitude and tidal nature are uncertain. Doppler data cannot entirely rule out the Roemer effect induced by possible distant companions.
format Articulo
Articulo
author Fernández Lajús, Eduardo Eusebio
Di Sisto, Romina Paula
author_facet Fernández Lajús, Eduardo Eusebio
Di Sisto, Romina Paula
author_sort Fernández Lajús, Eduardo Eusebio
title Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4
title_short Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4
title_full Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4
title_fullStr Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4
title_full_unstemmed Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4
title_sort homogeneously derived transit timings for 17 exoplanets and reassessed ttv trends for wasp-12 and wasp-4
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/125194
work_keys_str_mv AT fernandezlajuseduardoeusebio homogeneouslyderivedtransittimingsfor17exoplanetsandreassessedttvtrendsforwasp12andwasp4
AT disistorominapaula homogeneouslyderivedtransittimingsfor17exoplanetsandreassessedttvtrendsforwasp12andwasp4
bdutipo_str Repositorios
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