J/AJ/164/215 Candidate members of Cep-Her, RSG-5 and CH-2 (Bouma+, 2022)
Kepler and the Behemoth; Three Mini-Neptunes in a 40 Million Year Old
Association.
Bouma L.G., Kerr R., Curtis J.L., Isaacson H., Hillenbrand L.A.,
Howard A.W., Kraus A.L., Bieryla A., Latham D.W., Petigura E.A., Huber D.
<Astron. J., 164, 215 (2022)>
=2022AJ....164..215B 2022AJ....164..215B
ADC_Keywords: Clusters, open; Positional data; Parallaxes, trigonometric;
Optical;
Keywords: Stellar associations ; Exoplanet evolution ; Open star clusters
; Stellar ages
Abstract:
Stellar positions and velocities from Gaia are yielding a new view of
open cluster dispersal. Here we present an analysis of a group of
stars spanning Cepheus (l=100°) to Hercules (l=40°), hereafter
the Cep-Her complex. The group includes four Kepler objects of
interest: Kepler-1643b (Rp=2.32±0.13R⊕, P=5.3days),
KOI-7368b (Rp=2.22±0.12R⊕, P=6.8days), KOI-7913Ab
(Rp=2.34±0.18R⊕, P=24.2days), and Kepler-1627 Ab
(Rp=3.85±0.11R⊕, P=7.2days). The latter Neptune-sized planet
is in part of the Cep-Her complex called the δLyr cluster. Here
we focus on the former three systems, which are in other regions of
the association. Based on kinematic evidence from Gaia, stellar
rotation periods from TESS, and spectroscopy, these three objects are
also ∼40 million years (Myr) old. More specifically, we find that
Kepler-1643 is 46-7+9Myr old, based on its membership in a dense
subcluster of the complex called RSG-5. KOI-7368 and KOI-7913 are
36-8+10Myr old, and are in a diffuse region that we call CH-2.
Based on the transit shapes and high-resolution imaging, all three
objects are most likely planets, with false-positive probabilities of
6x10-9, 4x10-3, and 1x10-4 for Kepler-1643, KOI-7368, and
KOI-7913, respectively. These planets demonstrate that mini-Neptunes
with sizes of ∼2 Earth radii exist at ages of 40Myr.
Description:
Table2 contains 338 candidate Cep-Her members with weights D>0.02
observed by Kepler. Table2 was created by cross-matching candidate
Cep-Her members (selected using Gaia EDR3) against a Kepler to Gaia
DR2 cross-match.
Table3 contains spatial, kinematic, astrometric, and rotation period
information for the 173 candidate RSG-5 members and 37 candidate CH-2
members described in Section 2.2.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 119 338 Candidate Cep-Her members observed by Kepler
table3.dat 131 210 Rotation periods and kinematics for candidate
RSG-5 and CH-2 members
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See also:
J/AJ/106/1059 : Lithium in the Pleiades (Soderblom+, 1993)
J/A+A/372/862 : Lithium abundances in IC 2602 and IC 2391 (Randich+, 2001)
J/A+A/439/1137 : PHOENIX model chromospheres of M dwarfs (Fuhrmeister+, 2005)
J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)
J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)
J/AJ/147/146 : Spectroscopy of Tuc-Hor candidate members (Kraus+, 2014)
J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014)
J/ApJ/804/146 : Atmospheric parameters for nearby B-F stars (David+, 2015)
J/AJ/152/8 : Impact of stellar mult. on planetary systems I. (Kraus+, 2016)
J/ApJ/822/86 : False positive probabilities Q1-Q17 DR24 KOIs (Morton+, 2016)
J/MNRAS/461/794 : Scorpius-Centaurus K-Type Stars (Pecaut+, 2016)
J/AJ/152/113 : Pleiades members K2 light curves. I. Periods (Rebull+, 2016)
J/A+A/595/A22 : 9 new open clusters within 500pc from the Sun (Roser+, 2016)
J/ApJ/842/83 : Praesepe members rotational periods K2 LCs (Douglas+, 2017)
J/AJ/154/109 : California-Kepler Survey. III. Planet radii (Fulton+, 2017)
J/AJ/154/107 : California-Kepler Survey. I. 1305 stars (Petigura+, 2017)
J/ApJ/836/77 : Library of high-S/N optical spectra of FGKM stars (Yee+, 2017)
J/ApJ/855/115 : Lithium abundances of KOIs from CKS spectra (Berger+, 2018)
J/A+A/613/A63 : Lithium content for 148 Pleiades stars (Bouvier+, 2018)
J/A+A/618/A93 : Gaia DR2 open clusters in the Milky Way (Cantat-Gaudin+, 2018)
J/MNRAS/476/908 : Chromospheric activity in 4 open clusters (Fang+, 2018)
J/A+A/616/A10 : 46 open clusters GaiaDR2 HRdiagrams (Gaia Collaboration, 2018)
J/AJ/155/89 : California-Kepler Survey (CKS). IV. Planets (Petigura+, 2018)
J/A+A/612/A99 : Gaia-ESO Survey in 7 open star cluster fields (Randich+, 2018)
J/AJ/155/196 : Analysis of K2 LCs members of USco & ρOph (Rebull+, 2018)
J/ApJS/235/38 : Kepler planetary cand VIII. DR25 reliability (Thompson+, 2018)
J/A+A/620/A172 : Solar neighbourhood young stars 3D mapping (Zari+, 2018)
J/AJ/158/77 : Candidates & members of Pisces-Eridanus stream (Curtis+, 2019)
J/A+A/623/A112 : The Sco OB2 population from Gaia DR2 data (Damiani+, 2019)
J/AJ/158/122 : Local structure &star formation history of MW (Kounkel+, 2019)
J/ApJ/870/32 : Kinematics in young star clusters & associations (Kuhn+, 2019)
J/A+A/625/A135 : Galactic interstellar dust Gaia2MASS 3Dmaps (Lallement+, 2019)
J/A+A/622/L13 : Stellar stream in Gaia DR2 discovery (Meingast+, 2019)
J/A+A/625/L13 : TESS light curve of beta Pictoris (Zieba+, 2019)
J/AJ/160/239 : Cluster difference imaging photo. survey. II. (Bouma+, 2020)
J/ApJ/904/140 : Ruprecht 147 members & rot. data 5 other cl. (Curtis+, 2020)
J/ApJ/903/96 : MUTA; the µTau Association (Gagne+, 2020)
J/A+A/634/A1 : NGC 1068 GRAVITY reconstructed image (GRAVITY+, 2020)
J/MNRAS/496/2422 : Abundances 42 Pisces-Eridanus stream stars (Hawkins+, 2020)
J/MNRAS/495/4924 : Exoplanets in Southern open clusters (Nardiello+, 2020)
J/AJ/159/273 : Taurus members & nonmembers with K2 data (Rebull+, 2020)
J/A+A/638/A9 : A census of the near-by Psc-Eri stellar stream (Roeser+, 2020)
J/AJ/162/197 : Photo., rotation & Li in open cluster NCG2516 (Bouma+, 2021)
J/A+A/649/A6 : Gaia Catalogue of Nearby Stars-GCNS (Gaia collaboration, 2021)
J/A+A/647/A137 : 800pc tital tail of Hyades (Jerabkova+, 2021)
J/A+A/645/A84 : Coronae of nearby star clusters (Meingast+, 2021)
J/AJ/161/171 : THYME. V. Discovering stellar association (Tofflemire+, 2021)
J/AJ/163/121 : Radial velocity and light curve of Kepler 1627A (Bouma+, 2022)
J/AJ/163/156 : THYME. VI. TOI-1227 radial velocity (Mann+, 2022)
J/AJ/163/179 : The California-Kepler Survey. X. (Petigura+, 2022)
J/AJ/164/80 : Periods & supporting data UCL/LCC non/members (Rebull+, 2022)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- DR2 Gaia DR2 source identifier
21- 39 I19 --- EDR3 Gaia EDR3 source identifier
41- 48 I8 --- KIC Kepler Input catalog identifier
50- 58 F9.5 deg RAdeg [280/302] EDR3 Right Ascension
(ICRS at Epoch=2016.5)
60- 67 F8.5 deg DEdeg [36/52] EDR3 Declination (ICRS at Epoch=2016.5)
69- 73 F5.3 --- weight [0.02/0.54] Strength of connectivity to other
candidate cluster members
75- 79 F5.2 km/s vl* [-8.15/8.93] Longitudinal galactic velocity,
vl*cos(b)
81- 86 F6.2 km/s vb [-10.73/3.24] Latitudinal galactic velocity
88- 94 F7.1 pc X [-8092/-7983] Galactocentric X position coordinate
96-100 F5.1 pc Y [245/373] Galactocentric Y position coordinate
102-106 F5.1 pc Z [53/143] Galactocentric Z position coordinate
108-112 F5.3 arcsec Offset [0.003/0.92] Separation between KIC and Gaia DR2
positions
114-119 F6.3 mag Dmag [-0.05/0.04] G-band difference between EDR3 and
DR2 source match
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- EDR3 Gaia EDR3 source identifier
21- 29 F9.5 deg RAdeg [284/306] Gaia EDR3 Right Ascension
(ICRS at Epoch=2016.5)
31- 38 F8.5 deg DEdeg [41/53] Gaia EDR3 Declination
(ICRS at Epoch=2016.5)
40- 45 F6.4 mas plx [2.8/4.03] Gaia EDR3 parallax
47- 51 F5.3 --- RUWE [0.74/3.37] Gaia EDR3 renormalized unit
weight error
53- 57 F5.3 --- weight [0.001/0.74] Strength of connectivity to other
candidate cluster members
59- 62 F4.2 km/s vl* [2.09/6] Longitudinal galactic velocity,
vlcos(b)
64- 68 F5.2 km/s vb [-3.98/-1.64] Latitudinal galactic velocity
70- 76 F7.1 pc X [-8101/-8047] Galactocentric X position
coordinate
78- 82 F5.1 pc Y [231/350] Galactocentric Y position coordinate
84- 88 F5.1 pc Z [40/105] Galactocentric Z position coordinate
90- 95 F6.3 mag BP-RP [-0.43/3.49] Gaia BP-RP color, minus E(BP-RP)
97-102 F6.3 mag GMAG [-0.68/12.96] Absolute G-band magnitude,
corrected for extinction
104-108 A5 --- Cluster Cluster, RSG-5 or CH-2
110-115 F6.3 d Prot-A [0.61/29.5]? Adopted rotation period if available
117-122 F6.3 d Prot-T [0.61/13.4]? TESS rotation period if available
124-129 F6.3 d Prot-Z [0.69/29.5]? ZTF rotation period if available
131-131 I1 --- Confused [0/1] Boolean flag; 1=stars are photometrically
blended
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 02-Dec-2022