Doppler confirmation of TESS planet candidate TOI1408.01: grazing transit and likely eccentric orbit
| Autor: | Galazutdinov, G. A., Baluev, R. V., Valyavin, G., Aitov, V., Gadelshin, D., Valeev, A., Sendzikas, E., Sokov, E., Mitiani, G., Burlakova, T., Yakunin, I., Antonyuk, K. A., Vlasyuk, V., Romanyuk, I., Rzaev, A., Yushkin, M., Ivanova, A., Tavrov, A., Korablev, O. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Monthly Notices of the Royal Astronomical Society: Letters 2023 September 5 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnrasl/slad127 |
| Popis: | We report an independent Doppler confirmation of the TESS planet candidate orbiting an F-type main sequence star TOI-1408 located 140 pc away. We present a set of radial velocities obtained with a high-resolution fiber-optic spectrograph FFOREST mounted at the SAO RAS 6-m telescope (BTA-6). Our self-consistent analysis of these Doppler data and TESS photometry suggests a grazing transit such that the planet obscures its host star by only a portion of the visible disc. Because of this degeneracy, the radius of TOI-1408.01 appears ill-determined with lower limit about $\sim$1 R$_{\rm Jup}$, significantly larger than in the current TESS solution. We also derive the planet mass of $1.69\pm0.20$~$M_{\rm Jup}$ and the orbital period $\sim4.425$ days, thus making this object a typical hot Jupiter, but with a significant orbital eccentricity of $0.259\pm0.026$. Our solution may suggest the planet is likely to experience a high tidal eccentricity migration at the stage of intense orbital rounding, or may indicate possible presence of other unseen companions in the system, yet to be detected. Comment: 5 pages, 3 figures |
| Databáze: | arXiv |
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