High-Resolution Fiber-Fed Spectrograph for the 6-m Telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences: Assessment of Efficiency

Valyavin, G. G.; Мусаев, Ф. А.; Perkov, A.; Aitov, V. N.; Бычков, В. Д.; Drabek, S. V.; Shergin, V. S.; Sazonenko, D. A.; Kukushkin, D. E.; Галазутдинов, Г. А.; Emelyanov, E. V.; Yakopov, G. V.; Burlakova, T. E.; Bertaux, Jean-Loup; Tavrov, Alexander V.; Korablev, Oleg; Yushkin, M. V.; Valeev, A. F.; Gadelshin, D. R.; Kim, K.-M.; Han, Inwoo; Lee, B.-Ch.

doi:10.1134/s1990341320020157

Cited by 12 publications

(2 citation statements)

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“…A description of the general concept and optical layout of the spectrograph can be found in Valyavin et al [13][14][15][16]. In our solution, we followed the classical scheme known as the "white pupil" [17].…”

Section: A Fiber-fed High Resolution Planetary Spectrographmentioning

confidence: 99%

“…By using a 63-m fiber assembly, which feeds the light from the star accumulated in the prime focus of the 6-m telescope to a special thermally and mechanically isolated room with the spectrograph (see Valyavin et al [16] for details), the presently reached accuracy of the radial-velocity measurements for cool stars is up to 3 m/s. In the final configuration, the spectrograph is planned to be equipped with an interferometric control system based on a vacuumized and stabilized FabryPerot interferometer for yet higher, up to 50 cm/s accuracies.…”

Section: A Fiber-fed High Resolution Planetary Spectrographmentioning

confidence: 99%

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EXPLANATION: Exoplanet and Transient Event Investigation Project—Optical Facilities and Solutions

et al. 2022

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Over the past decades, the achievements in astronomical instrumentation have given rise to a number of novel advanced studies related to the analysis of large arrays of observational data. One of the most famous of these studies is a study of transient events in the near and far space and a search for exoplanets. The main requirements for such kinds of projects are a simultaneous coverage of the largest possible field of view with the highest possible detection limits and temporal resolution. In this study, we present a similar project aimed at creating an extensive, continuously updated survey of transient events and exoplanets. To date, the core of the project incorporates several 0.07–2.5 m optical telescopes and the 6-m BTA telescope of the Special Astrophysical Observatory of RAS (Russia), a number of other Russian observatories and the Bonhyunsan observatory of the Korea Astronomy and Space Science Institute (South Korea). Our attention is mainly focused on the description of two groups of small, wide-angle optical telescopes for primary detection. All the telescopes are originally designed for the goals of the project and may be of interest to the scientific community. A description is also given for a new, high-precision optical spectrograph for the Doppler studies of transient and exoplanet events detected within the project. We present here the philosophy, expectations and first results obtained during the first year of running the project.

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Section: A Fiber-fed High Resolution Planetary Spectrographmentioning

confidence: 99%

Section: A Fiber-fed High Resolution Planetary Spectrographmentioning

confidence: 99%

EXPLANATION: Exoplanet and Transient Event Investigation Project—Optical Facilities and Solutions

et al. 2022

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Peculiarities of radial velocity variability of lines in the spectrum of α Cyg supergiant

Рзаев

2023

Monthly Notices of the Royal Astronomical Society

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We use about 430 CCD spectra obtained in 1998–2001 and in 2007 to study temporal radial velocity variations of the ion, HeI, and Hβ lines in the spectrum of the α Cyg. We found that these variations are caused by pulsation-type motions. In case of the ion and He I lines, fluctuations occur in the fundamental radial mode with the period of about 12.5 ± 1.0 days and the amplitude of 5.0 ± 0.5 km s−1. The oscillation lasts about ∼34 ± 1 days. In the case of the H β line the radial velocity variability was studied separately for the blue and red halves of the line profile. Such a methodical approach allowed to discover three characteristic cases of radial velocity variability for the blue and red halves of the Hβ line profile. In 1999 and 2001, the period P and amplitude A variability parameters are the same for the blue and red halves, and hence for the line bisector too. In 1998, P and A are the same for the blue and red halves of the profile, however, there is a phase shift between the fluctuations of their radial velocity by 0.6P. In 2000, P and A are different for the two halves of the line profile. Relative to the center of the star’s mass, the average expansion rate for the atmospheric layers, where the H β line is formed, is about −10.0 km s−1. It varies over time with a semi-amplitude of around ±3.3 km s−1.

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Doppler confirmation of TESS planet candidate TOI−1408.01: grazing transit and likely eccentric orbit

Galazutdinov,

Baluev,

Valyavin

et al. 2023

Monthly Notices of the Royal Astronomical Society: Letters

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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 ∼1 RJup, significantly larger than in the current TESS solution. We also derive the planet mass of 1.69 ± 0.20 MJup and the orbital period ∼4.425 days, thus making this object a typical hot Jupiter, but with a significant orbital eccentricity of 0.259 ± 0.026. 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.

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High-Resolution Fiber-Fed Spectrograph for the 6-m Telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences: Assessment of Efficiency

Cited by 12 publications

References 12 publications

EXPLANATION: Exoplanet and Transient Event Investigation Project—Optical Facilities and Solutions

EXPLANATION: Exoplanet and Transient Event Investigation Project—Optical Facilities and Solutions

Peculiarities of radial velocity variability of lines in the spectrum of α Cyg supergiant

Doppler confirmation of TESS planet candidate TOI−1408.01: grazing transit and likely eccentric orbit

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