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

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Mancini L., Southworth J., Naponiello L., BAŞTÜRK Ö., Barbato D., Biagiotti F., ...Daha Fazla

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, cilt.509, sa.1, ss.1447-1464, 2022 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 509 Sayı: 1
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1093/mnras/stab2691
  • Dergi Adı: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, INSPEC, Metadex, zbMATH, DIALNET, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.1447-1464
  • Anahtar Kelimeler: methods: data analysis, techniques: photometric, stars: fundamental parameters, stars: individual: KELT-16, planetary systems, TRANSITING EXTRASOLAR PLANETS, HIGH-PRECISION PHOTOMETRY, PHYSICAL-PROPERTIES, TIDAL DISSIPATION, TIMING VARIATIONS, ORBITAL DECAY, DETECTION LIMITS, WASP-12 B, SYSTEM, PERIOD
  • Ankara Üniversitesi Adresli: Evet

Özet

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.