Confirming long-period transiting exoplanets with TESS and CHEOPS. The case of HD 22946 d

Rok, strany: 2024, 150 - 156

Due to the limited observing duration of the Transiting Exoplanet Survey Satellite (TESS) primary mission, which observed the majority of the near-ecliptic sectors for only 27 days, planets on long periods produce only single transits. However, thanks to its extended mission, TESS re-observed the same fields 2 years later, and in many cases was able to re-detect a second transit. These ‘duotransit’ cases require follow-up in order to uncover the true orbital period due to the gap, which causes a set of aliases. The Characterising Exoplanet Satellite (CHEOPS) space observatory can be used to follow-up duotransit targets and to determine their true orbital periods and other characteristics. We investigated the HD 22946 planetary system with a similar aim. Based on the combined TESS and CHEOPS observations, we successfully determined the true orbital period of the planet d to be 47.42489 ± 0.00011 d, and derived precise radii of the planets in the system. Planet d, as a warm sub-Neptune, is very interesting because there are only a few similar confirmed exoplanets to date.

ISO 690:

Garai, Z., Osborn, H., Tuson, A., Ulmer-Moll, S., The Cheops Consortium, . 2024. Confirming long-period transiting exoplanets with TESS and CHEOPS. The case of HD 22946 d. In Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 54, no.2, pp. 150-156. 1335-1842. DOI: https://doi.org/10.31577/caosp.2024.54.2.150

APA:

Garai, Z., Osborn, H., Tuson, A., Ulmer-Moll, S., The Cheops Consortium, . (2024). Confirming long-period transiting exoplanets with TESS and CHEOPS. The case of HD 22946 d. Contributions of the Astronomical Observatory Skalnaté Pleso, 54(2), 150-156. 1335-1842. DOI: https://doi.org/10.31577/caosp.2024.54.2.150

Vydavateľ: Astronomical Institute, Slovak Academy of Sciences

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