Analysis of the Most Precise Light Curves of HAT-P-36 Detrended from Spot Signals

• Autorzy: Yalçınkaya S. , Baştürk Ö. , El Helweh F. , Esmer E. M. , Yörükoğlu O. , Yılmaz M. , Şenavcı H. V. , Kılıçoğlu T. , Selam S. O.

Identyfikatory

DOI

10.32023/0001-5237/71.3.3

• Języki publikacji: EN

Abstrakty

EN

We study the most precise light curves of the planet-host HAT-P-36 that we obtained from the ground primarily with a brand-new 80 cm telescope (T80) very recently installed at Ankara University Kreiken Observatory (AUKR), Turkey and also from the space with Transiting Exoplanet Survey Satellite (TESS). The main objective of the study is to analyze the Transit Timing Variations (TTV) observed in the hot-Jupiter type planet HAT-P-36 b, a strong candidate for orbital decay. Our analysis is based on our own observations as well as those acquired by professional and amateur observers since its discovery. HAT-P-36 displays out-of-transit variability as well as light curve anomalies during the transits of its planet due to stellar spots. We collected and detrended from these anomalies all complete transit light curves we had access to. We modeled transits with EXOFAST and measured the mid-transit times forming a homogeneous data set for a TTV analysis. We found an increase in the orbital period of HAT-P-36 b at a rate of 0.014 s per year from the best fitting quadratic function. This increase is only found in the TTV constructed from the mid-transit times measured from detrended light curves. We refined the values of the system parameters by modeling with EXOFASTv2 the Spectral Energy Distribution of the host star, its archival radial velocity observations from multiple instruments, and the most precise transit light curves from the space and ground covering a wide range of wavelengths. We also analyzed the out-of-transit variability from TESS observations to search for potential rotational modulations through a frequency analysis. We report a statistically significant periodicity in the TESS light curve at 4.22±0.02 d, which might have been caused by instrumental systematics but should be tracked in the future observations of the target.

Słowa kluczowe

EN

stars: individual: HAT-P-36; planetary systems; methods: observational; techniques: photometric

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2021
• Tom: Vol. 71, No. 3
• Strony: 223--242
• Opis fizyczny: Bibliogr. 47 poz., tab., wykr.

Twórcy

autor

Yalçınkaya S.

• Ankara University, Faculty of Science, Astronomy & Space Sciences Department, Tandogan, TR-06100, Ankara, Turkey

autor

Baştürk Ö.

• Ankara University, Faculty of Science, Astronomy & Space Sciences Department, Tandogan, TR-06100, Ankara, Turkey

autor

El Helweh F.

• Bilkent University, Science Faculty, Physics Department, TR-06800 Ankara, Turkey

autor

Esmer E. M.

• Ankara University, Faculty of Science, Astronomy & Space Sciences Department, Tandogan, TR-06100, Ankara, Turkey

autor

Yörükoğlu O.

• Ankara University, Faculty of Science, Astronomy & Space Sciences Department, Tandogan, TR-06100, Ankara, Turkey

autor

Yılmaz M.

• Ankara University, Faculty of Science, Astronomy & Space Sciences Department, Tandogan, TR-06100, Ankara, Turkey

autor

Şenavcı H. V.

• Ankara University, Faculty of Science, Astronomy & Space Sciences Department, Tandogan, TR-06100, Ankara, Turkey

autor

Kılıçoğlu T.

• Ankara University, Faculty of Science, Astronomy & Space Sciences Department, Tandogan, TR-06100, Ankara, Turkey

autor

Selam S. O.

• Ankara University, Faculty of Science, Astronomy & Space Sciences Department, Tandogan, TR-06100, Ankara, Turkey

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)