TUBITAK Destekli Projelerden Çıkan Yayınlar Topluluğu
Published January 1, 2019 | Version v1
Journal article Open

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

Creators

  • 1. Univ Hertfordshire, Ctr Astrophys Res, STRI, Coll Lane, Hatfield AL10 9AB, Herts, England
  • 2. St Petersburg State Univ, Fac Math & Mech, Univ Skij Pr 28, St Petersburg 198504, Russia
  • 3. Univ Geneva, Geneva Observ, Chemin Mailettes 51, CH-1290 Versoix, Switzerland
  • 4. Acton Sky Portal Private Observ, Acton, MA USA
  • 5. Univ Nacl Cordoba, Inst Astron Teor & Expt, Laprida 854,X5000BGR, Cordoba, Argentina
  • 6. Univ Dublin, Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland
  • 7. Ankara Univ, Fac Sci, Dept Astron & Space Sci, TR-06100 Ankara, Turkey
  • 8. Baronnies Provencales Observ, Hautes Alpes Parc Nat Reg Baronnies Provencales, F-05150 Moydans, France
  • 9. Warkauden Kassiopeia Ry, Taurus Hill Observ, Harkamaentie 88, FI-79480 Kangaslampi, Finland
  • 10. Univ Saskatchewan, Phys & Engn Phys Dept, 116 Sci Pl, Saskatoon, SK S7N 5E2, Canada
  • 11. Observ Vaison Romaine, 1075 RD 51, F-84110 Vaison La Romaine, France
  • 12. Natl Youth Space Ctr, Goheung 59567, Jeollanam Do, South Korea
  • 13. Vilnius Univ, Inst Theoret Phys & Astron, Sauletekio Al 3, LT-10257 Vilnius, Lithuania

Description

We homogeneously analyse similar to 3.2 x 10(5) photometric measurements for similar to 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 non-linear 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 ms(-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.

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