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  A hot Saturn on an eccentric orbit around the giant star K2-132

Jones, M. I., Brahm, R., Espinoza, N., Jordán, A., Rojas, F., Rabus, M., et al. (2018). A hot Saturn on an eccentric orbit around the giant star K2-132. Astronomy and Astrophysics, 613.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CD00-4 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CD01-3
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018A&A...613A..76J (Any fulltext)
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 Creators:
Jones, M. I.1, Author
Brahm, R.1, Author
Espinoza, N.1, Author
Jordán, A.1, Author
Rojas, F.1, Author
Rabus, M.1, Author
Drass, H.1, Author
Zapata, A.1, Author
Soto, M. G.1, Author
Jenkins, J. S.1, Author
Vučković, M.1, Author
Ciceri, S.1, Author
Sarkis, P.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: techniques: radial velocities planet-star interactions planets and satellites: general Astrophysics - Earth and Planetary Astrophysics
 Abstract: Although the majority of radial velocity detected planets have been found orbiting solar-type stars, a fraction of them have been discovered around giant stars. These planetary systems have revealed different orbital properties when compared to solar-type star companions. In particular, radial velocity surveys have shown that there is a lack of giant planets in close-in orbits around giant stars, in contrast to the known population of hot Jupiters orbiting solar-type stars. It has been theorized that the reason for this distinctive feature in the semimajor axis distribution is the result of the stellar evolution and/or that it is due to the effect of a different formation/evolution scenario for planets around intermediate-mass stars. However, in the past few years a handful of transiting short-period planets (P ≲ 10 days) have been found around giant stars, thanks to the high-precision photometric data obtained initially by the Kepler mission, and later by its two-wheel extension K2. These new discoveries have allowed us for the first time to study the orbital properties and physical parameters of these intriguing and elusive substellar companions. In this paper we report on an independent discovery of a transiting planet in field 10 of the K2 mission, also reported recently by Grunblatt et al. (2017, AJ, 154, 254). The host star has recently evolved to the giant phase, and has the following atmospheric parameters: Teff = 4878 ± 70 K, log g = 3.289 ± 0.004, and [Fe/H] = -0.11 ± 0.05 dex. The main orbital parameters of K2-132 b, obtained with all the available data for the system are: P = 9.1708 ± 0.0025 d, e = 0.290 ± 0.049, Mp = 0.495 ± 0.007 MJ and Rp = 1.089 ± 0.006 RJ. This is the fifth known planet orbiting any giant star with a &lt; 0.1, and the most eccentric one among them, making K2-132 b a very interesting object. Tables of the photometry and of the radial velocities are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/613/A76">http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/613/A76</A>

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 Dates: 2018
 Publication Status: Issued
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Title: Astronomy and Astrophysics
Source Genre: Journal
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Pages: - Volume / Issue: 613 Sequence Number: - Start / End Page: - Identifier: -