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    HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star

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    HD207897 b A dense sub-Neptune transiting a nearby and bright K-type star.pdf (1.910Mb)
    Date
    2022
    Author
    Heidari, N.
    Boisse, I.
    Orell-Miquel, J.
    Hébrard, G.
    Acuña, L.
    Hara, N. C.
    Lillo-Box, J.
    Eastman, J. D.
    Arnold, L.
    Astudillo-Defru, N.
    Adibekyan, V.
    Bieryla, A.
    Bonfils, X.
    Bouchy, F.
    Barclay, T.
    Brasseur, C. E.
    Borgniet, S.
    Bourrier, V.
    Buchhave, L.
    Publisher
    Astronomy & Astrophysics
    Description
    Artículo de publicación WOS - SCOPUS
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    Abstract
    We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet Survey Satellite mission and radial velocity (RV) observations from the SOPHIE, Automated Planet Finder, and HIRES high-precision spectrographs. We used EXOFASTv2 to model the parameters of the planet and its host star simultaneously, combining photometric and RV data to determine the planetary system parameters. We show that the planet has a radius of 2.50 ± 0.08 RE and a mass of either 14.4 ± 1.6 ME or 15.9 ± 1.6 ME with nearly equal probability. The two solutions correspond to two possibilities for the stellar activity period. The density accordingly is either 5.1 ± 0.7 g cm−3 or 5.5 +0.8 −0.7 g cm−3 , making it one of the relatively rare dense sub-Neptunes. The existence of this dense planet at only 0.12 AU from its host star is unusual in the currently observed sub-Neptune (2 < RE < 4) population. The most likely scenario is that this planet has migrated to its current position.
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    http://repositoriodigital.ucsc.cl/handle/25022009/3056
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