TUBITAK Destekli Projelerden Çıkan Yayınlar Topluluğu
Published January 1, 2022 | Version v1
Journal article Open

The ultra-hot-Jupiter KELT-16 b: dynamical evolution and atmospheric properties

Creators

  • 1. Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England
  • 2. Ankara Univ, Fac Sci, Astron & Space Sci Dept, TR-06100 Ankara, Turkey
  • 3. Univ Roma Tor Vergata, Dept Phys, Via Ric Sci 1, I-00133 Rome, Italy
  • 4. INAF OAS, Osservatorio Astrofis & Sci Spazio Bologna, Via P Gobetti 93-3, I-40129 Bologna, Italy
  • 5. INAF Brera Astron Observ, Via E Bianchi 46, I-23807 Merate, LC, Italy
  • 6. Pontificia Univ Catolica Chile, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile
  • 7. INAF Turin Astrophys Observ, Via Osservatorio 20, I-10025 Pino Torinese, Italy
  • 8. Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
  • 9. INAF Padova Astron Observ, Vicolo Osservatorio 5, I-35122 Padua, Italy
  • 10. Inst Invest Astron & Ciencias Planetarias, Campus Paulino del Barrio Ave Copayapu 485, Copiapo 1531772, Chile

Description

We present broad-band photometry of 30 planetary transits of the ultra-hot-Jupiter KELT-16 b, using five medium-class telescopes. The transits were monitored through standard B, V, R, I filters and four were simultaneously observed from different places, for a total of 36 new light curves. We used these new photometric data and those from the TESS space telescope to review the main physical properties of the ICELT-16 planetary system. Our results agree with previous measurements but are more precise. We estimated the mid-transit times for each of these transits and combined them with others from the literature to obtain 69 epochs, with a time baseline extending over more than 4 yr, and searched for transit time variations. We found no evidence for a period change, suggesting a lower limit for orbital decay at 8 Myr, with a lower limit on the reduced tidal quality factor of Q(*)' > (1.9 +/- 0.8) x 10(5) with 95 per cent confidence. We built up an observational, low-resolution transmission spectrum of the planet, finding evidence of the presence of optical absorbers, although with a low significance. Using TESS data, we reconstructed the phase curve finding that KELT-16 b has a phase offset of 25.25 +/- 14.03 degrees E, a day- and night-side brightness temperature of 3190 +/- 61 K and 2668 +/- 56 K, respectively. Finally, we compared the flux ratio of the planet over its star at the TESS and Spitzer wavelengths with theoretical emission spectra, finding evidence of a temperature inversion in the planet's atmosphere, the chemical composition of which is preferably oxygen-rich rather than carbon-rich.

Files

bib-77cd4e9f-c0c9-4d2f-80a6-46e3abe3978b.txt

Files (398 Bytes)

Name Size Download all
md5:8ceef34e3bc6d630677e684aea7a4e55
398 Bytes Preview Download