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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2019
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Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/125194 |
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I19-R120-10915-125194 |
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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 |
_version_ |
1764820451364700160 |