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2017AJ....153..271S - Astron. J., 153, 271-271 (2017/June-0)

K2-66b and K2-106b: two extremely hot sub-Neptune-size planets with high densities.

SINUKOFF E., HOWARD A.W., PETIGURA E.A., FULTON B.J., CROSSFIELD I.J.M., ISAACSON H., GONZALES E., CREPP J.R., BREWER J.M., HIRSCH L., WEISS L.M., CIARDI D.R., SCHLIEDER J.E., BENNEKE B., CHRISTIANSEN J.L., DRESSING C.D., HANSEN B.M.S., KNUTSON H.A., KOSIAREK M., LIVINGSTON J.H., GREENE T.P., ROGERS L.A. and LEPINE S.

Abstract (from CDS):

We report precise mass and density measurements of two extremely hot sub-Neptune-size planets from the K2 mission using radial velocities, K2 photometry, and adaptive optics imaging. K2-66 harbors a close-in sub-Neptune-sized (2.49–0.24+0.34R) planet (K2-66b) with a mass of 21.3±3.6M. Because the star is evolving up the subgiant branch, K2-66b receives a high level of irradiation, roughly twice the main-sequence value. K2-66b may reside within the so-called "photoevaporation desert," a domain of planet size and incident flux that is almost completely devoid of planets. Its mass and radius imply that K2-66b has, at most, a meager envelope fraction (<5%) and perhaps no envelope at all, making it one of the largest planets without a significant envelope. K2-106 hosts an ultra-short-period planet (P = 13.7 hr) that is one of the hottest sub-Neptune-size planets discovered to date. Its radius (1.82–0.14+0.20R) and mass (9.0±1.6M) are consistent with a rocky composition, as are all other small ultra-short-period planets with well-measured masses. K2-106 also hosts a larger, longer-period planet (Rp = 2.77–0.23+0.37R, P = 13.3 days) with a mass less than 24.4M at 99.7% confidence. K2-66b and K2-106b probe planetary physics in extreme radiation environments. Their high densities reflect the challenge of retaining a substantial gas envelope in such extreme environments.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): planetary systems - planets and satellites: detection - planets and satellites: dynamical evolution and stability - planets and satellites: formation - techniques: radial velocities - techniques: spectroscopic - techniques: spectroscopic

Simbad objects: 19

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2019.10.16-07:58:25

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