2016ApJ...818...36P


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.10CEST21:41:24

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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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 GJ 3470 b Pl 07 59 05.8395618539 +15 23 29.240025256           ~ 141 1
2 Ross 905b Pl 11 42 11.0932 +26 42 23.653           ~ 573 1
3 HATS-7b Pl 13 55 25.6669508861 -21 12 27.722673542           ~ 19 0
4 HAT-P-26b Pl 14 12 37.5329989220 +04 03 36.117671696           ~ 95 1
5 EPIC 203772026 * 16 10 17.2581432344 -24 59 13.512160933           ~ 1 0
6 K2-24 PM* 16 10 17.6977179986 -24 59 25.258944730   12.22 11.28     ~ 14 0
7 K2-24c Pl 16 10 17.6977179986 -24 59 25.258944730           ~ 17 0
8 K2-24b Pl 16 10 17.6977179986 -24 59 25.258944730           ~ 13 0
9 HD 149026b Pl 16 30 29.6184841164 +38 20 50.310893575           ~ 293 1
10 Kepler-30b Pl 19 01 08.0746750853 +38 56 50.218666290           ~ 54 1
11 KOI-7.01 Pl 19 02 27.6981397378 +50 08 08.703759444           ~ 83 1
12 KOI-244.01 Pl 19 06 33.2143323702 +39 29 16.357969502           ~ 56 1
13 KOI-277.02 Pl 19 25 00.0430855076 +49 13 54.631289830           ~ 113 1
14 CoRoT-8b Pl 19 26 21.2426686221 +01 25 35.178176730           ~ 42 1
15 KOI-157.03 Pl 19 48 27.6228219845 +41 54 32.902654079           ~ 97 1
16 KOI-3.01 Pl 19 50 50.2474562793 +48 04 51.097364378           ~ 271 1
17 KOI-1574.02 Pl 19 51 40.0490992347 +46 57 54.427022288           ~ 31 1
18 KOI-137.03 Pl 19 52 19.0688249829 +44 44 46.807526602           ~ 58 1
19 KOI-137.01 Pl 19 52 19.0688249829 +44 44 46.807526602           ~ 56 1
20 Kepler-18 Ro* 19 52 19.0688249829 +44 44 46.807526602       13.93   ~ 95 1
21 KOI-137.02 Pl 19 52 19.0688249829 +44 44 46.807526602           ~ 53 1
22 Kepler-79d Pl 20 02 04.1057596467 +44 22 53.646600034           ~ 52 1
23 BD-15 6290 BY* 22 53 16.7323107416 -14 15 49.303409936 12.928 11.749 10.192 9.013 7.462 M3.5V 849 1
24 BD-15 6290c Pl 22 53 16.73352 -14 15 49.3186           ~ 167 1
25 WASP-59b Pl 23 18 29.54 +24 53 21.4           ~ 25 1

    Equat.    Gal    SGal    Ecl

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2020.04.10-21:41:24

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