2016AJ....152..160B


Query : 2016AJ....152..160B

2016AJ....152..160B - Astron. J., 152, 160-160 (2016/December-0)

A 1.9 Earth radius rocky planet and the discovery of a non-transiting planet in the Kepler-20 system.

BUCHHAVE L.A., DRESSING C.D., DUMUSQUE X., RICE K., VANDERBURG A., MORTIER A., LOPEZ-MORALES M., LOPEZ E., LUNDKVIST M.S., KJELDSEN H., AFFER L., BONOMO A.S., CHARBONNEAU D., COLLIER CAMERON A., COSENTINO R., FIGUEIRA P., FIORENZANO A.F.M., HARUTYUNYAN A., HAYWOOD R.D., JOHNSON J.A., LATHAM D.W., LOVIS C., MALAVOLTA L., MAYOR M., MICELA G., MOLINARI E., MOTALEBI F., NASCIMBENI V., PEPE F., PHILLIPS D.F., PIOTTO G., POLLACCO D., QUELOZ D., SASSELOV D., SEGRANSAN D., SOZZETTI A., UDRY S. and WATSON C.

Abstract (from CDS):

Kepler-20 is a solar-type star (V = 12.5) hosting a compact system of five transiting planets, all packed within the orbital distance of Mercury in our own solar system. A transition from rocky to gaseous planets with a planetary transition radius of ∼1.6 R has recently been proposed by several articles in the literature. Kepler-20b (Rp ∼ 1.9 R) has a size beyond this transition radius; however, previous mass measurements were not sufficiently precise to allow definite conclusions to be drawn regarding its composition. We present new mass measurements of three of the planets in the Kepler-20 system that are facilitated by 104 radial velocity measurements from the HARPS-N spectrograph and 30 archival Keck/HIRES observations, as well as an updated photometric analysis of the Kepler data and an asteroseismic analysis of the host star (M* = 0.948±0.051M and R* = 0.964±0.018R). Kepler-20b is a 1.868–0.034+0.066R planet in a 3.7 day period with a mass of 9.70–1.44+1.41M, resulting in a mean density of 8.2–1.3+1.5g cm–3, indicating a rocky composition with an iron-to-silicate ratio consistent with that of the Earth. This makes Kepler-20b the most massive planet with a rocky composition found to date. Furthermore, we report the discovery of an additional non-transiting planet with a minimum mass of 19.96–3.61+3.08M and an orbital period of ∼34 days in the gap between Kepler-20f (P ∼ 11 days) and Kepler-20d (P ∼ 78 days).

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): planetary systems - planets and satellites: composition - stars: individual - techniques: radial velocities - techniques: radial velocities

VizieR on-line data: <Available at CDS (J/AJ/152/160): table1.dat>

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 CoRoT-7b Pl 06 43 49.4690164104 -01 03 46.826642700           ~ 402 1
2 * alf Cen Bb err 14 39 35.0 -60 50 15           ~ 44 2
3 Kepler-10 Ro* 19 02 43.0613892904 +50 14 28.701617339       11.00   G2V 204 1
4 Kepler-10b Pl 19 02 43.0613892904 +50 14 28.701617339           ~ 297 1
5 Kepler-20 Er* 19 10 47.5233433920 +42 20 19.301370684   13.278 12.630 12.478 11.64 G5V 169 1
6 Kepler-20b Pl 19 10 47.5233433920 +42 20 19.301370684           ~ 110 1
7 Kepler-20f Pl 19 10 47.5233433920 +42 20 19.301370684           ~ 63 1
8 Kepler-20d Pl 19 10 47.5233433920 +42 20 19.301370684           ~ 73 1
9 Kepler-20e Pl 19 10 47.5233433920 +42 20 19.301370684           ~ 56 1
10 Kepler-20c Pl 19 10 47.5233433920 +42 20 19.301370684           ~ 98 1
11 Kepler-20g Pl 19 10 47.5233433920 +42 20 19.301370684           ~ 12 0
12 Kepler-36b Pl 19 25 00.0428079600 +49 13 54.630900876           ~ 149 1
13 Kepler-36 Er* 19 25 00.0428079600 +49 13 54.630900876   12.795 12.174 12.094   F2 220 1
14 BD+38 3583b Pl 19 25 40.3885404552 +38 40 20.413186860           ~ 106 0
15 Kepler-78b Pl 19 34 58.0137407208 +44 26 53.960186940           ~ 140 1
16 HD 219134b Pl 23 13 16.9749603608 +57 10 06.083823619           ~ 104 0

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