Ivanyuk O. Chemical composition and properties of F, G, K stars – planet host candidates

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0424U000061

Applicant for

Specialization

  • 01.03.02 - Астрофізика, радіоастрономія

26-02-2024

Specialized Academic Board

Д 26.208.01

Main Astronomical Observatory of the National Academy of Sciences of Ukraine

Essay

This dissertation examines F, G, K stars to explore the relationships among their chemical compositions, properties, and the existence of planets. The work with the Calan-Hertfordshire sample of stars estimated the stability of the results of the spectra reduction and the influence of uncertainties of various origins; conducted a fidelity and precision meta-analysis of the modern methods in stellar spectroscopy; determined stellar properties were used to determine parameters of the planets. The study of a young fast-rotating star PZ Tel A, which has not reached the main sequence yet and is in a binary system with a substellar companion, was also conducted, it estimated the age of the star using several independent methods, investigated the relationship between lithium abundance, age, and activity within the scope of modern evolutionary models; estimated an upper mass limit of the nearby substellar companion. Finally, the study of a faint distant star WTS-2 with a short-period hot Jupiter was performed, it established the methods of processing low-quality distorted observed spectra, independently confirmed using photometric methods; obtained characteristics allowed to derive the properties of the planet and its orbit, and to investigate its tidal interaction with the convective envelope of the host star.

Research papers

Birkby, J. L., Cappetta, M., Cruz, P., Koppenhoefer, J., Ivanyuk, O., Mustill, A. J., Hodgkin, S. T., Pinfield, D. J., Sipocz, B., Kovacs, G., Saglia, R., Pavlenko, Y., Barrado, D., Bayo, A., Campbell, D., Catalan, S., Fossati, L., Galvez-Ortiz, M.-C., Kenworthy, M., Lillo-Box, J., Martın, E. L., Mislis, D., de Mooij, E. J. W., Nefs, S. V., Snellen, I. A. G., Stoev, H., Zendejas, J., del Burgo, C., Barnes, J., Goulding, N., Haswell, C. A., Kuznetsov, M., Lodieu, N., Murgas, F., Palle, E., Solano, E., Steele, P., Tata, R. WTS-2 b: a hot Jupiter orbiting near its tidal destruction radius around a K dwarf. Mon. Not. R. Astron. Soc. 440, 1470–1489. (2014).

Ivanyuk, O. M., Jenkins, J. S., Pavlenko, Y. V., Jones, H. R. A., Pinfield, D. J. The metal-rich abundance pattern – spectroscopic properties and abundances for 107 main-sequence stars. Mon. Not. R. Astron. Soc. 468, 4151–4169. (2017).

Jenkins, J. S., Pavlenko, Y. V., Ivanyuk, O., Gallardo, J., Jones, M. I., Day-Jones, A. C., Jones, H. R. A., Ruiz, M. T., Pinfield, D. J., Yakovina, L. Benchmark cool companions: ages and abundances for the PZ Telescopii system. Mon. Not. R. Astron. Soc. 420, 3587–3598. (2012).

Jenkins, J. S., Jones, H. R. A., Tuomi, M., Murgas, F., Hoyer, S., Jones, M. I., Barnes, J. R., Pavlenko, Y. V., Ivanyuk, O., Rojo, P., Jordan, A., Day-Jones, A. C., Ruiz, M. T., Pinfield, D. J. A hot Uranus orbiting the super metal-rich star HD 77338 and the metallicity-mass connection. Astrophys. J. 766, 67. (2013).

Jenkins, J. S., Tuomi, M., Brasser, R., Ivanyuk, O., Murgas, F. Two super-Earths orbiting the solar analog HD 41248 on the edge of a 7:5 mean motion resonance. Astrophys. J. 771, 41. (2013).

Jenkins, J. S., Jones, H. R. A., Tuomi, M., Diaz, M., Cordero, J.P., Aguayo, A., Pantoja, B., Arriagada, P., Mahu, R., Brahm, R., Rojo, P., Soto, M. G., Ivanyuk, O., Becerra Yoma, N., Day-Jones, A. C., Ruiz, M. T., Pavlenko, Y. V., Barnes, J. R., Murgas, F., Pinfield, D. J., Jones, M. I., Lopez-Morales, M., Shectman, S., Butler, R.P., Minniti, D. New planetary systems from the Calan-Hertfordshire Extrasolar Planet Search. Mon. Not. R. Astron. Soc. 466, 443–473. (2017).

Monier, R., Khalack, V., Ivanyuk, O. The Abundance of Phosphorus in the HgMn Star 14 Sge. Research Notes of the American Astronomical Society. 5 (3), 54. (2021).

Pavlenko, Y. V., Jenkins, J. S., Ivanyuk, O. M., Jones, H. R. A., Kaminsky, B. M., Lyubchik, Y.P., Yakovina, L. A. A detailed study of Lithium in 107 CHEPS dwarf stars. Astron. and Astrophys. 611, A27. (2018).

Pavlenko, Y. V., Kaminsky, B.M., Jenkins, J. S., Ivanyuk, O. M., Jones, H. R. A., Lyubchik, Y.P. Masses, oxygen, and carbon abundances in CHEPS dwarf stars. Astron. and Astrophys. 621, A112. (2019).

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