SIMBAD references

2016ApJ...818...36P - Astrophys. J., 818, 36 (2016/February-2)

Two transiting low density sub-saturns from K2.

PETIGURA E.A., HOWARD A.W., LOPEZ E.D., DECK K.M., FULTON B.J., CROSSFIELD I.J.M., CIARDI D.R., CHIANG E., LEE E.J., ISAACSON H., BEICHMAN C.A., HANSEN B.M.S., SCHLIEDER J.E. and SINUKOFF E.

Abstract (from CDS):

We report the discovery and confirmation of K2-24 b and c, two sub-Saturn planets orbiting a bright (V = 11.3), metal-rich ([Fe/H] = 0.42±0.04 dex) G3 dwarf in the K2 Campaign 2 field. The planets are 5.68±0.56 R and 7.82±0.72 R and have orbital periods of 20.8851±0.0003 days and 42.3633±0.0006 days, near the 2:1 mean-motion resonance. We obtained 32 radial velocities with Keck/HIRES and detected the reflex motion due to K2-24 b and c. These planets have masses of 21.0±5.4 M and 27.0±6.9 M, respectively. With low densities of 0.63±0.25 g/cm3 and 0.31±0.12 g/cm3, respectively, the planets require thick envelopes of H/He to explain their large sizes and low masses. Interior structure models predict that the planets have fairly massive cores of 17.6 ± 4.3 M and 16.1 ± 4.2 M, respectively. They may have formed exterior to their present locations, accreted their H/He envelopes at large orbital distances, and migrated in as a resonant pair. The proximity to resonance, large transit depths, and host star brightness offers rich opportunities for TTV follow-up. Finally, the low surface gravities of the K2-24 planets make them favorable targets for transmission spectroscopy by Hubble Space Telescope, Spitzer, and James Webb Space Telescope.

Abstract Copyright:

Journal keyword(s): planets and satellites: detection - stars: individual: EPIC-203771098 - techniques: photometric - techniques: spectroscopic

Status at CDS:  

Simbad objects: 25

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2020.03.30-13:41:48

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