2018AJ....155..222D


Query : 2018AJ....155..222D

2018AJ....155..222D - Astron. J., 155, 222-222 (2018/May-0)

Three small planets transiting the bright young field star K2-233.

DAVID T.J., CROSSFIELD I.J.M., BENNEKE B., PETIGURA E.A., GONZALES E.J., SCHLIEDER J.E., YU L., ISAACSON H.T., HOWARD A.W., CIARDI D.R., MAMAJEK E.E., HILLENBRAND L.A., CODY A.M., RIEDEL A., SCHWENGELER H.M., TANNER C. and ENDE M.

Abstract (from CDS):

We report the detection of three small transiting planets around the young K3 dwarf K2-233 (2MASS J15215519-2013539) from observations during Campaign 15 of the K2 mission. The star is relatively nearby (d = 69 pc) and bright (V = 10.7 mag, Ks = 8.4 mag), making the planetary system an attractive target for radial velocity follow-up and atmospheric characterization with the James Webb Space Telescope. The inner two planets are hot super-Earths (Rb = 1.40 ± 0.06 R, Rc = 1.34 ± 0.08 R), while the outer planet is a warm sub-Neptune (Rd = 2.6 ± 0.1 R). We estimate the stellar age to be 360–140+490 Myr based on rotation, activity, and kinematic indicators. The K2-233 system is particularly interesting given recent evidence for inflated radii in planets around similarly aged stars, a trend potentially related to photo-evaporation, core cooling, or both mechanisms.

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

Journal keyword(s): planetary systems - planets and satellites: gaseous planets - planets and satellites: physical evolution - planets and satellites: terrestrial planets - stars: individual: EPIC 249622103

Simbad objects: 13

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Number of rows : 13
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 HD 3167 PM* 00 34 57.5242131960 +04 22 53.284093032       8.4   K0V 86 0
2 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3411 0
3 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3050 0
4 BD+10 1799 * 08 26 27.8490900672 +10 04 49.334175156   9.42 8.92     F6 49 0
5 NGC 2632 OpC 08 40 13.0 +19 37 16           ~ 1546 0
6 HD 106315 * 12 13 53.3962381416 -00 23 36.553445304   9.402 8.951     F5V 44 0
7 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 439 2
8 HD 110463 BY* 12 41 44.5223098128 +55 43 28.822255644   9.250 8.265     K3Ve 113 0
9 BD-19 4086b Pl 15 21 55.1983073496 -20 13 53.990924232           ~ 6 0
10 BD-19 4086d Pl 15 21 55.1983073496 -20 13 53.990924232           ~ 9 0
11 BD-19 4086 * 15 21 55.1983073496 -20 13 53.990924232   11.81 10.88     K3 20 0
12 BD-19 4086c Pl 15 21 55.1983073496 -20 13 53.990924232           ~ 6 0
13 BD-02 5958 PM* 23 27 04.8376907739 -01 17 10.582653030   11.57 10.10 10.09 8.89 K6V 78 0

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