Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4
| dc.contributor.author | Baştürk, Özgür | |
| dc.contributor.department | Fen Fakültesi | tr_TR |
| dc.date.accessioned | 2020-02-18T11:01:48Z | |
| dc.date.available | 2020-02-18T11:01:48Z | |
| dc.date.issued | 2019 | |
| dc.description.abstract | We homogeneously analyse ∼3.2 × 105 photometric measurements for ∼1100 transit light curves belonging to 17 exoplanet hosts. The photometric data cover 16 years (2004–2019) and include amateur and professional observations. Old archival light curves 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 transit timing variation (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 of about −7.5 ± 2.2 m s−1 yr−1, 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 homogeneous TTV sample, including 10 ground-based EXPANSION light curves 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. © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society | tr_TR |
| dc.description.index | Scopus | |
| dc.description.index | Wos | |
| dc.identifier.endpage | 1312 | tr_TR |
| dc.identifier.issn/e-issn | 0035-8711 | |
| dc.identifier.issn/e-issn | 1365-2966 | |
| dc.identifier.issue | 1 | tr_TR |
| dc.identifier.startpage | 1294 | tr_TR |
| dc.identifier.uri | https://doi.org/10.1093/mnras/stz2620 | tr_TR |
| dc.identifier.uri | http://hdl.handle.net/20.500.12575/69745 | |
| dc.identifier.volume | 490 | tr_TR |
| dc.language.iso | en | tr_TR |
| dc.relation.isversionof | 10.1093/mnras/stz2620 | tr_TR |
| dc.relation.journal | Monthly Notices of the Royal Astronomical Society | tr_TR |
| dc.relation.publicationcategory | Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı | tr_TR |
| dc.rights | CC0 1.0 Universal | * |
| dc.rights.uri | http://creativecommons.org/publicdomain/zero/1.0/ | * |
| dc.title | Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4 | tr_TR |
| dc.type | Article | tr_TR |