J/PASJ/68/92 Subaru NIR obs. of Pleiades stars in SEEDS survey (Konishi+, 2016)
A substellar companion to Pleiades HII 3441.
Konishi M., Matsuo T., Yamamoto K., Samland M., Sudo J., Shibai H.,
Itoh Y., Fukagawa M., Sumi T., Kudo T., Hashimoto J., Kuzuhara M.,
Kusakabe N., Abe L., Akiyama E., Brandner W., Brandt T.D., Carson J.C.,
Feldt M., Goto M., Grady C.A., Guyon O., Hayano Y., Hayashi M.,
Hayashi S.S., Henning T., Hodapp K.W., Ishii M., Iye M., Janson M.,
Kandori R., Knapp G.R., Kwon J., McElwain M.W., Mede K., Miyama S.,
Morino J.-I., Moro-Martin A., Ishimura T., Oh D., Pyo T.-S., Serabyn E.,
Schlieder J.E., Suenaga T., Suto H., Suzuki R., Takahashi Y.H., Takami M.,
Takato N., Terada H., Thalmann C., Turner E.L., Watanabe M.,
Wisniewski J.P., Yamada T., Takami H., Usuda T., Tamura M.
<Publ. Astron. Soc. Jap., 68, 92 (2016)>
=2016PASJ...68...92K 2016PASJ...68...92K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple; Photometry, infrared; Photometry, RI;
Stars, distances; Spectral types; Associations, stellar
Keywords: brown dwarfs - stars: imaging -
stars: individual (Pleiades HII 3441) - stars: low-mass -
Astrophysics: Earth and Planetary Astrophysics -
Astrophysics: Solar and Stellar Astrophysics
Abstract:
We find a new substellar companion to the Pleiades member star,
Pleiades HII 3441, using the Subaru telescope with adaptive optics.
The discovery is made as part of the high-contrast imaging survey to
search for planetary-mass and substellar companions in the Pleiades
and young moving groups. The companion has a projected separation of
0.49±0.02 (66±2au) and a mass of 68±5MJ based on three
observations in the J-, H-, and Ks-bands. The spectral type is
estimated to be M7 (∼2700K), and thus no methane absorption is
detected in the H band. Our Pleiades observations result in the
detection of two substellar companions including one previously
reported among 20 observed Pleiades stars, and indicate that the
fraction of substellar companions in the Pleiades is about
10.0+26.1-8.8%. This is consistent with multiplicity studies of
both the Pleiades stars and other open clusters.
Description:
We observed Pleiades HII 3441 as part of the SEEDS (Strategic
Exploration of Exoplanet and Disks with Subaru; Tamura 2009AIPC.1158...11T 2009AIPC.1158...11T)
survey.
Three observations were conducted for Pleiades HII 3441, on 2011
September 4, on 2014 October 11, and on 2015 January 8 with HiCIAO
along with AO188 on the Subaru telescope.
The supplement contains results of subsamples that we
obtained, including previously reported results of Pleiades stars
(Yamamoto+ 2013PASJ...65...90Y 2013PASJ...65...90Y).
Supplementary Table 1 represents our target list. Supplementary Table 2
shows the observing logs of data taken after September 2012, excluding
the ones reported in (Yamamoto+ 2013). Supplementary Table 3 is the
companion candidates list including their projected separation,
position angle (PA), and photometric results. The companion status is
determined by confirmation of their proper motion.
Objects:
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RA (ICRS) DE Designation(s)
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03 44 43.95 +25 29 57.4 Pleiades HII 3441 = Cl Melotte 22 3441
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File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tables1.dat 92 39 Target list
tables2.dat 92 36 Observing logs taken after September 2012
(for 21 stars)
tables3.dat 75 68 Companion candidate list
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/297 : NOMAD Catalog (Zacharias+ 2005)
J/A+A/299/696 : Pleiades field Membership probabilities (Schilbach+, 1995)
J/A+A/323/139 : K magnitude of Pleiades low-mass binaries (Bouvier+ 1997)
J/A+A/332/575 : Pleiades member list (Belikov+ 1998)
J/AJ/123/1570 : alpha Persei and Praesepe Clusters (Patience+, 2002)
J/A+A/400/891 : IZ photometry of Pleiades brown dwarfs (Moraux+, 2003)
J/MNRAS/380/712 : ZYJHK photometry in Pleiades (Lodieu+, 2007)
J/A+A/492/277 : Analysis of Collinder 69 stars with VOSA (Bayo+, 2008)
J/ApJS/181/62 : Survey of young solar analogs (Metchev+, 2009)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/ApJ/794/159 : Statistical analysis of exoplanet surveys (Brandt+, 2014)
Byte-by-byte Description of file: tables1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name Main name of the source
19 A1 --- f_Name d: Previously reported
in Yamamoto+ 2013PASJ...65...90Y 2013PASJ...65...90Y
21- 27 A7 --- HD HD identification
29- 30 I2 h RAh Hour of right ascension (J2000)
32- 33 I2 min RAm Minute of right ascension (J2000)
35- 38 F4.1 s RAs Second of right ascension (J2000)
40 A1 --- DE- Sign of declination (J2000)
41- 42 I2 deg DEd Degree of declination (J2000)
44- 45 I2 arcmin DEm Arcminute of declination (J2000)
47- 50 F4.1 arcsec DEs Arcsecond of declination (J2000)
52- 53 A2 --- SpT Spectral type
55- 62 A8 --- Group Group (2)
64- 68 F5.1 pc Dist [11.7/135] Distance
70- 74 F5.2 mag Rmag [4.7/12.5] NOMAD R magnitude
(Zacharias+ 2005, I/297)
76- 80 F5.2 mag Jmag [4.7/10.7] 2MASS J-band magnitude
82- 86 F5.2 mag Hmag [4.5/10.2] 2MASS H-band magnitude
88- 92 F5.2 mag Ksmag [4.3/10.1] 2MASS Ks-band magnitude
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Note (2): We focused on young stars whose ages are well known. Each target
belongs to one of the moving groups (MG) or associations as follows:
Pleiades = Pleiades open cluster (120Myr, 135pc; Yamamoto+ 2013PASJ...65...90Y 2013PASJ...65...90Y)
UMa = Ursa Major MG (500Myr, 25pc; King+ 2003AJ....125.1980K 2003AJ....125.1980K)
ONA = Octans-Near association (<100Myr, 90pc;
Zuckerman+ 2013ApJ...778....5Z 2013ApJ...778....5Z
AB Dor = AB Doradus MG (50Myr, 30pc; Lopez-Santiago+ 2006ApJ...643.1160L 2006ApJ...643.1160L)
One target (GJ 212) is considered to belong to either Hercules-Lyra
association (200Myr, <25pc; Lopez-Santiago+ 2006ApJ...643.1160L 2006ApJ...643.1160L) or
Local association (20-150Myr: Montes+ 2001, J/MNRAS/328/45).
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Byte-by-byte Description of file: tables2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name Name of the source
19- 29 A11 "date" Date Date of observation (UT)
30 A1 --- --- [,]
32- 33 I2 d Date2 ? Second day of observation if any
35 A1 --- f_Date [a] a: extremely poor condition
37- 46 A10 --- Mode Mode (SDI=spectral differential imaging ;
ADI=angular differential imaging or
DI=direct imaging)
48- 55 A8 --- Filt Filter(s) (1)
57- 66 A10 s sExp sub exposure(s)
68- 77 A10 --- Coadd Coadd
79- 92 A14 min Exp Total exposure(s)
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Note (1): The H band is divided into two narrow bands (HS: 1.486-1.628um and
HL: 1.643-1.788um) in the SDI mode.
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Byte-by-byte Description of file: tables3.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Name of the source (1)
19- 21 A3 --- CC Companion candidate number
23 A1 --- f_CC [c-e] Flag on CC (2)
25- 37 A13 --- Status Status (3)
38 A1 --- f_Status [f] Flag on Status (2)
40- 50 A11 "date" Date Date of observation (UT)
51 A1 --- --- [,]
53- 53 I1 d Date2 ? Second day of observation if any
55- 60 F6.3 arcsec Sep [0.15/12.7]? Separation (4)
61 A1 --- f_Sep [as] Flag on Sep (2)
63- 67 F5.1 deg PA [14/354]? Position angle (4)
68 A1 --- f_PA [as] Flag on PA (2)
70- 74 F5.2 mag Hmag [6.3/21.4]? Subaru/HiCIAO H-band magnitude (4)
75 A1 --- f_Hmag [as] Flag on Hmag (2)
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Note (1): BD+01 565 is very likely a misprint for BD-01 565; corrected at CDS.
Note (2): Flag as follows:
a = Data were not suitable for accurate measurements due to poor condition.
c = This object locates very close to CC2. It has a possibility of artifacts.
d = Yamamoto+ (2013PASJ...65...90Y 2013PASJ...65...90Y) could not conclude the companion status
of these objects.
e = Previously reported in Yamamoto+ (2013PASJ...65...90Y 2013PASJ...65...90Y), and only the
latest properties are shown.
f = This was judged by comparison with the previous work
(Ammler-von Eiff+ 2016, J/A+A/591/A84).
s = This CC was not detected in the second epoch.
Note (3): Status as follows:
BG = background objects
FG = foreground objects
C = Companions
U = Undefined objects
Note (4): Typical uncertainties of separation, PA, and photometric results
are 0.01"-0.03", 0.1-1.0°, and 0.1-0.9mag.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 06-Apr-2021