2018AJ....155...57C

Query : 2018AJ....155...57C

2018AJ....155...57C - Astron. J., 155, 57-57 (2018/February-0)

The K2-138 system: a near-resonant chain of five sub-Neptune planets discovered by citizen scientists.

CHRISTIANSEN J.L., CROSSFIELD I.J.M., BARENTSEN G., LINTOTT C.J., BARCLAY T., SIMMONS B.D., PETIGURA E., SCHLIEDER J.E., DRESSING C.D., VANDERBURG A., ALLEN C., McMASTER A., MILLER G., VELDTHUIS M., ALLEN S., WOLFENBARGER Z., COX B., ZEMIRO J., HOWARD A.W., LIVINGSTON J., SINUKOFF E., CATRON T., GREY A., KUSCH J.J.E., TERENTEV I., VALES M. and KRISTIANSEN M.H.

Abstract (from CDS):

K2-138 is a moderately bright (V = 12.2, K = 10.3) main-sequence K star observed in Campaign 12 of the NASA K2 mission. It hosts five small (1.6-3.3 R⊕) transiting planets in a compact architecture. The periods of the five planets are 2.35, 3.56, 5.40, 8.26, and 12.76 days, forming an unbroken chain of near 3:2 resonances. Although we do not detect the predicted 2-5 minute transit timing variations (TTVs) with the K2 timing precision, they may be observable by higher-cadence observations with, for example, Spitzer or CHEOPS. The planets are amenable to mass measurement by precision radial velocity measurements, and therefore K2-138 could represent a new benchmark system for comparing radial velocity and TTV masses. K2-138 is the first exoplanet discovery by citizen scientists participating in the Exoplanet Explorers project on the Zooniverse platform.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): eclipses - stars: individual: K2-138 - techniques: photometric - techniques: spectroscopic - techniques: spectroscopic

Simbad objects: 34

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Number of rows : 34
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 3167 PM* 00 34 57.5242131960 +04 22 53.284093032       8.4   K0V 128 0
2 CD-30 1812b Pl 04 25 29.0166589296 -30 36 01.610731368           ~ 104 1
3 L 591-6 PM* 04 28 35.7191141945 -25 10 09.297934937   13.6 11.962 11.629   M2.5V 64 0
4 K2-3 PM* 11 29 20.3917077216 -01 27 17.281697868   13.52 12.17 11.88   M1V 99 0
5 K2-18b Pl 11 30 14.5177445592 +07 35 18.255348492           ~ 303 0
6 HD 106315 * 12 13 53.3962381416 -00 23 36.553445304   9.402 8.951     F5V 62 0
7 K2-37 * 16 13 48.2446204272 -24 47 13.428497616           ~ 36 0
8 K2-32 PM* 16 49 42.2601799152 -19 32 34.151379684   13.28 12.31 12.11   ~ 66 0
9 Kepler-363 Er* 18 52 46.1054164776 +41 18 19.315610676   14.380 13.473 13.334   G5V 64 0
10 Kepler-350 Er* 19 01 40.7037733680 +39 42 22.016147364   14.669 13.884 13.903   F5 57 0
11 Kepler-192 Er* 19 11 40.2999391728 +45 35 34.425445272   15.237 14.223 14.041   G7 72 0
12 Kepler-254 Er* 19 12 39.5241024600 +45 48 59.394712176   16.896 15.958 15.953   ~ 71 0
13 Kepler-402 Er* 19 13 28.8534589176 +43 21 16.582563936   13.884 13.317 13.177   F2 75 0
14 Kepler-60 Er* 19 15 50.6983640712 +42 15 54.050260968   14.477 14.083 13.934   G2 132 1
15 Kepler-85 Er* 19 23 53.6255300424 +45 17 25.088907084   15.782 14.932 14.785   ~ 79 1
16 Kepler-275 Er* 19 29 55.1288580480 +38 30 53.670776796   16.109 15.382 15.344   ~ 58 0
17 Kepler-217 Ro* 19 32 09.0586262088 +46 16 39.067579920           F3V 65 0
18 Kepler-339 Er* 19 33 24.4114554120 +48 26 40.647612696   15.555 14.778 14.664   G7 60 0
19 Kepler-276 Er* 19 34 16.3567060728 +39 02 10.707604404       15.399   G7 63 0
20 Kepler-114 PM* 19 36 29.1357624552 +48 20 58.291722816   14.972 13.803 13.746   M0V 86 0
21 Kepler-23 Er* 19 36 52.5355328952 +49 28 45.252600204   14.190 13.547 13.71   G2V 98 1
22 Kepler-304 Er* 19 37 46.0342587552 +40 33 27.199163844       14.885   ~ 70 0
23 Kepler-215 Er* 19 39 53.6402937048 +45 12 49.220709192   14.273 13.736 13.636   G3 85 0
24 Kepler-80 Er* 19 44 27.0200680656 +39 58 43.594100688   16.303 15.201 14.866   M0V 177 1
25 Kepler-223 Er* 19 53 16.4202435936 +47 16 46.308434088   16.209 15.570 15.78   ~ 192 1
26 Kepler-79 Er* 20 02 04.1057010912 +44 22 53.646047436   14.55 13.98 14.00   F5 136 1
27 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0
28 K2-138d Pl 23 15 47.7686067840 -10 50 58.895461284           ~ 22 0
29 K2-138c Pl 23 15 47.7686067840 -10 50 58.895461284           ~ 19 0
30 K2-138f Pl 23 15 47.7686067840 -10 50 58.895461284           ~ 22 0
31 K2-138e Pl 23 15 47.7686067840 -10 50 58.895461284           ~ 22 0
32 K2-138b Pl 23 15 47.7686067840 -10 50 58.895461284           ~ 18 0
33 K2-138 * 23 15 47.7686067840 -10 50 58.895461284   13.01 12.21 12.12 11.40 ~ 75 0
34 2MASS J23154868-1050583 * 23 15 48.6749554368 -10 50 57.670767240           ~ 2 0

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