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Journal Article

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

MPS-Authors

Brahm,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Espinoza,  N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rabus,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jordán,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Díaz,  M. R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rojas,  F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Vučković,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zapata,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cortés,  C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Drass,  H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jenkins,  J. S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lachaume,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pantoja,  B.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sarkis,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Soto,  M. G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Vasquez,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Henning,  Th
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jones,  M. I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019MNRAS.483.1970B
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Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D401-A
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.