2017AJ....153...64M


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.28CET14:08:06

2017AJ....153...64M - Astron. J., 153, 64-64 (2017/February-0)

Zodiacal exoplanets in time (ZEIT). IV. Seven transiting planets in the Praesepe cluster.

MANN A.W., GAIDOS E., VANDERBURG A., RIZZUTO A.C., ANSDELL M., MEDINA J.V., MACE G.N., KRAUS A.L. and SOKAL K.R.

Abstract (from CDS):

Open clusters and young stellar associations are attractive sites to search for planets and to test theories of planet formation, migration, and evolution. We present our search for, and characterization of, transiting planets in the 800 Myr old Praesepe (Beehive, M44) Cluster from K2 light curves. We identify seven planet candidates, six of which we statistically validate to be real planets, the last of which requires more data. For each host star, we obtain high-resolution NIR spectra to measure its projected rotational broadening and radial velocity, the latter of which we use to confirm cluster membership. We combine low-resolution spectra with the known cluster distance and metallicity to provide precise temperatures, masses, radii, and luminosities for the host stars. Combining our measurements of rotational broadening, rotation periods, and our derived stellar radii, we show that all planetary orbits are consistent with alignment to their host star's rotation. We fit the K2 light curves, including priors on stellar density to put constraints on the planetary eccentricities, all of which are consistent with zero. The difference between the number of planets found in Praesepe and Hyades (8 planets, ≃800 Myr) and a similar data set for Pleiades (0 planets, ≃125 Myr) suggests a trend with age, but may be due to incompleteness of current search pipelines for younger, faster-rotating stars. We see increasing evidence that some planets continue to lose atmosphere past 800 Myr, as now two planets at this age have radii significantly larger than their older counterparts from Kepler.

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 - stars: fundamental parameters - stars: low-mass - open clusters and associations: individual: M44 - open clusters and associations: individual: M44

Simbad objects: 28

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Number of rows : 28

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 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2928 0
2 K2-25b Pl? 04 13 05.6134710701 +15 14 52.013808246           ~ 22 0
3 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2607 0
4 NAME Tau-Aur Region SFR 04 30 +25.0           ~ 1189 1
5 NGC 2168 OpC 06 08 54 +24 20.0           ~ 452 0
6 GJ 3470 b Pl 07 59 05.8395618539 +15 23 29.240025256           ~ 131 1
7 EPIC 211916756.01 Pl? 08 37 27.0563002037 +18 58 36.022931591           ~ 14 0
8 K2-95 * 08 37 27.0563002037 +18 58 36.022931591   19.86 17.27     M2.0 28 0
9 K2-100b Pl? 08 38 24.3004849747 +20 06 21.828303951           ~ 10 0
10 K2-100 Ro* 08 38 24.3004849747 +20 06 21.828303951   11.085 10.521     G0V 53 0
11 K2-104 LM* 08 38 32.8360254043 +19 46 25.591362599   18.46 16.26     M1V 26 0
12 K2-104b Pl? 08 38 32.8360254043 +19 46 25.591362599           ~ 6 0
13 K2-102b Pl? 08 40 13.4532692251 +19 46 43.712129004           ~ 4 0
14 K2-102 Ro* 08 40 13.4532692251 +19 46 43.712129004   14.318 13.200     K3V 34 0
15 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1192 0
16 EPIC 211913977.01 Pl? 08 41 22.5783122210 +18 56 01.949079322           ~ 8 0
17 K2-101 Ro* 08 41 22.5783122210 +18 56 01.949079322   13.970 12.957     K3V 31 0
18 EPIC 211901114 * 08 41 35.6914360530 +18 44 34.979358145   19.59 17.14     M2.7 17 0
19 EPIC 211901114.01 Pl? 08 41 35.6914360530 +18 44 34.979358145           ~ 3 0
20 K2-103b Pl? 08 41 38.4894143572 +17 38 24.084663344           ~ 4 0
21 K2-103 LM* 08 41 38.4894143572 +17 38 24.084663344           K7V 22 0
22 NGC 2682 OpC 08 51 18 +11 48.0           ~ 1998 0
23 Ross 905b Pl 11 42 11.0932 +26 42 23.653           ~ 560 1
24 K2-33b Pl? 16 10 14.7378782154 -19 19 09.407200797           ~ 24 0
25 NAME Upper Sco Association As* 16 12 -23.4           ~ 972 1
26 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2964 0
27 NGC 6774 OpC 19 16 42 -16 17.0           ~ 72 0
28 NGC 6811 OpC 19 37 17 +46 23.3   7.47 6.8     ~ 235 0

    Equat.    Gal    SGal    Ecl

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2020.01.28-14:08:06

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