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  Asteroseismology of iota Draconis and Discovery of an Additional Long-period Companion

Hill, M., Kane, S., Campante, T., Li, Z., Dalba, P., Brandt, T., et al. (2021). Asteroseismology of iota Draconis and Discovery of an Additional Long-period Companion. The Astronomical Journal, 162(5): 211. doi:10.3847/1538-3881/ac1b31.

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 Creators:
Hill, M.L., Author
Kane, S.R., Author
Campante, T.L., Author
Li, Z., Author
Dalba, P.A., Author
Brandt, T.D., Author
White, T.R., Author
Pope, B.J.S., Author
Stassun, K.G., Author
Fulton, B.J., Author
Corsaro, E., Author
Li, T., Author
Ong, J.M.J., Author
Bedding, T.R., Author
Bossini, D., Author
Buzasi, D.L., Author
Chaplin, W.J., Author
Cunha, M.S., Author
García, R.A., Author
Breton, S.N., Author
Hon, M., AuthorHuber, D., AuthorJiang, Chen1, Author              Kayhan, C., AuthorKuszlewicz, James S.2, Author              Mathur, S., AuthorSerenelli, A., AuthorStello, D., Author more..
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              
2Max Planck Research Group in Stellar Ages and Galactic Evolution (SAGE), Max Planck Institute for Solar System Research, Max Planck Society, ou_2265636              

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Free keywords: Photometry; Radial velocity; Exoplanet dynamics; Exoplanets; Exoplanet astronomy; Exoplanet systems; Exoplanet detection methods; Planet hosting stars; Asteroseismology; Stellar astronomy; Planetary dynamics; Detection
 Abstract: Giant stars as known exoplanet hosts are relatively rare due to the potential challenges in acquiring precision radial velocities and the small predicted transit depths. However, these giant host stars are also some of the brightest in the sky and so enable high signal-to-noise ratio follow-up measurements. Here, we report on new observations of the bright (V ~ 3.3) giant star ι Draconis (ι Dra), known to host a planet in a highly eccentric ~511 day period orbit. TESS observations of the star over 137 days reveal asteroseismic signatures, allowing us to constrain the stellar radius, mass, and age to ~2%, ~6%, and ~28%, respectively. We present the results of continued radial-velocity monitoring of the star using the Automated Planet Finder over several orbits of the planet. We provide more precise planet parameters of the known planet and, through the combination of our radial-velocity measurements with Hipparcos and Gaia astrometry, we discover an additional long-period companion with an orbital period of ∼68+60−36 yr. Mass predictions from our analysis place this substellar companion on the border of the planet and brown dwarf regimes. The bright nature of the star combined with the revised orbital architecture of the system provides an opportunity to study planetary orbital dynamics that evolve as the star moves into the giant phase of its evolution.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Title: The Astronomical Journal
Source Genre: Journal
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Publ. Info: Bristol, England : IOP Publishing
Pages: - Volume / Issue: 162 (5) Sequence Number: 211 Start / End Page: - Identifier: ISSN: 1538-3881
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_4