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  K2-161b: a low-density super-Neptune on an eccentric orbit

Brahm, R., Espinoza, N., Rabus, M., Jordán, A., Díaz, M. R., Rojas, F., et al. (2019). K2-161b: a low-density super-Neptune on an eccentric orbit. Monthly Notices of the Royal Astronomical Society, 483, 1970-1979.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D401-A Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D402-9
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2019MNRAS.483.1970B (Any fulltext)
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 Creators:
Brahm, R.1, Author
Espinoza, N.1, Author
Rabus, M.1, Author
Jordán, A.1, Author
Díaz, M. R.1, Author
Rojas, F.1, Author
Vučković, M.1, Author
Zapata, A.1, Author
Cortés, C.1, Author
Drass, H.1, Author
Jenkins, J. S.1, Author
Lachaume, R.1, Author
Pantoja, B.1, Author
Sarkis, P.1, Author
Soto, M. G.1, Author
Vasquez, S.1, Author
Henning, Th1, Author
Jones, M. I.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: techniques: photometric techniques: radial velocities planets and satellites: fundamental parameters stars: fundamental parameters stars: individual: K2-161 Astrophysics - Earth and Planetary Astrophysics Astrophysics - Solar and Stellar Astrophysics
 Abstract: We report the discovery of K2-161b, which was first identified as a planetary candidate from Kepler K2 photometry of Campaign 14, and whose planetary nature and orbital parameters were then confirmed with precision radial velocities. K2-161b is half as massive as Saturn (M_P= 0.179 ± 0.021 MJ), and has a radius of R_P= 0.840 ± 0.011 R_J, which translates into a bulk density of {ρ _P}=0.37 ± 0.05 g cm^{-3}. K2-161b transits its slightly evolved G-type host star (M_{\star }= 1.105 ± 0.019 M_{☉ }, R_{\star }= 1.669 ± 0.022 R_{☉ }) every 11.633 64 ± 0.000 10 d and presents a significantly eccentric orbit (e = 0.420 ± 0.034). We estimate a relatively short circularization time-scale of 1.8 Gyr for the planet, but given the advanced age of the system we expect the planet to be engulfed by its evolving host star in ̃1 Gyr before the orbit circularizes. The low density of the planet coupled to the brightness of the host star (J = 9.4) makes this system one of the best candidates known to date in the super-Neptune regime for atmospheric characterization via transmission spectroscopy, and to further study the transition region between ice and gas giant planets.

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 Dates: 2019
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 483 Sequence Number: - Start / End Page: 1970 - 1979 Identifier: -