J/ApJ/754/37 HD 192263 radial velocities and photometry (Dragomir+, 2012)
The HD 192263 system: planetary orbital period and stellar variability
disentangled.
Dragomir D., Kane S.R., Henry G.W., Ciardi D.R., Fischer D.A., Howard A.W.,
Jensen E.L.N., Laughlin G., Mahadevan S., Matthews J.M., Pilyavsky G.,
von Braun K., Wang S.X., Wright J.T.
<Astrophys. J., 754, 37 (2012)>
=2012ApJ...754...37D 2012ApJ...754...37D
ADC_Keywords: Stars, variable ; Radial velocities ; Photometry, uvby ;
Planets ; Stars, double and multiple
Keywords: planetary systems; stars: activity; stars: individual: HD 192263;
starspots; techniques: photometric; techniques: radial velocities
Abstract:
As part of the Transit Ephemeris Refinement and Monitoring Survey, we
present new radial velocities and photometry of the HD 192263 system.
Our analysis of the already available Keck-HIRES and CORALIE radial
velocity measurements together with the five new Keck measurements we
report in this paper results in improved orbital parameters for the
system. We derive constraints on the size and phase location of the
transit window for HD 192263b, a Jupiter-mass planet with a period of
24.3587±0.0022 days. We use 10 years of Automated Photoelectric
Telescope photometry to analyze the stellar variability and search for
planetary transits. We find continuing evidence of spot activity with
periods near 23.4 days. The shape of the corresponding photometric
variations changes over time, giving rise to not one but several
Fourier peaks near this value. However, none of these frequencies
coincides with the planet's orbital period and thus we find no
evidence of star-planet interactions in the system. We attribute the
∼23 day variability to stellar rotation. There are also indications of
spot variations on longer (8 years) timescales. Finally, we use the
photometric data to exclude transits for a planet with the predicted
radius of 1.09RJ, and as small as 0.79RJ.
Description:
A total of 181 CORALIE (an echelle spectrograph on the 1.2m Swiss
telescope at La Silla, Chile) RV measurements have been reported in
Santos et al. (2003, Cat. J/A+A/406/373), of which those included in
Santos et al. (2000A&A...356..599S 2000A&A...356..599S) are a subset. In addition there
are 31 published Keck measurements (Butler et al. 2006,
Cat. J/ApJ/646/505; Vogt et al. 2000ApJ...536..902V 2000ApJ...536..902V). To these we add
five new Keck observations, acquired between 2006 and 2011. All Keck
observations were made with the HIRES echelle spectrograph on the 10m
Keck I telescope.
We acquired 985 photometric observations using the T11 0.8m Automatic
Photometric Telescope (APT), located at Fairborn Observatory in
southern Arizona. The data span just over a decade, from 2001 April 13
to 2011 November 23. Measurements were obtained simultaneously in the
Stroemgren b and y passbands by two EMI 9124QB photomultiplier tubes.
The individual b and y differential magnitudes are averaged to obtain
the quantity Δ(b+y)/2. The observing and data reduction
procedures are identical to those described in Henry
(1999PASP..111..845H 1999PASP..111..845H) for the T8 0.8m APT.
Objects:
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RA (2000) DE Designation(s) (Period)
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20 13 59.85 -00 52 00.7 HD 192263 = V* V1703 Aql (P=24.3587)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 20 181 CORALIE radial velocities
table3.dat 24 36 Keck radial velocities
table5.dat 24 985 Photometric observations of HD 192263 from the
T11 0.8m Automatic Photometric Telescope (APT)
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See also:
J/A+A/552/A119 : Planet-star and moon-planet interaction (Saur+, 2013)
J/A+A/552/A27 : Stellar activity and kinematics of FGK stars (Murgas+, 2013)
J/ApJ/745/24 : A search for new companions with CHARA (Raghavan+, 2012)
J/ApJ/733/68 : Exoplanet masses derived from RVs (Brown+, 2011)
J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)
J/ApJ/716/1336 : Stability analysis of single-planet (Kopparapu+, 2010)
J/A+A/521/A40 : Stroemgren photometry of Milky Way stars (Arnadottir+, 2010)
J/A+A/521/A12 : Radial velocities of nearby late-type stars (Maldonado+, 2010)
J/ApJ/705/1226 : Planet-bearing stars in Spitzer (Bryden+, 2009)
J/ApJ/694/1085 : Radii of exoplanet host stars (van Belle+, 2009)
J/ApJ/666/475 : Extrasolar planet taxonomy (Marchi+, 2007)
J/ApJ/649/1010 : Habitability of known exoplanetary systems (Jones+, 2006)
J/ApJ/646/505 : Catalog of nearby exoplanets (Butler+, 2006)
J/ApJ/646/523 : Exoplanet systems with stellar companions (Raghavan+, 2006)
J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)
J/A+A/406/373 : Radial velocities of HD 192263 (Santos+, 2003)
J/A+A/398/363 : Statistical properties of exoplanets II (Santos+, 2003)
J/ApJS/141/503 : Radial Velocities for 889 late-type stars (Nidever+, 2002)
J/A+AS/142/275 : Stellar activity of late-type stars (Strassmeier+ 2000)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d BJD Barycentric Julian Date; (BJD-2440000)
14- 16 I3 m/s RVel [-98/70] Radial velocity
18- 20 I3 m/s e_RVel [4/15] Uncertainty in RVel
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d BJD Barycentric Julian Date (BJD-2440000)
14- 19 F6.2 m/s RVel [-56.5/47.8] Radial velocity
21- 24 F4.2 m/s e_RVel [0.8/2.2] Uncertainty in RVel
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d HJD Heliocentric Julian Date; (HJD-2400000)
12- 17 F6.4 mag P-C1(by) [0.51/0.57] Program star - Comparison star 1
differential magnitude Δ(b+y)/2 (1)
19- 24 F6.4 mag C1-C2(by) [0.06/0.1] Comparison star 1 - Comparison star 2
differential magnitude Δ(b+y)/2 (1)
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Note (1): Two comparison stars were considered for the differential photometry:
Comparison star 1 (C1) = HD 193328 (V=7.48, B-V=0.12, A2)
Comparison star 2 (C2) = HD 193225 (V=7.35, B-V=0.29, F0).
Typical precision of a single relative flux measurement from T11 is
0.0010-0.0020, depending on the quality of the night and the air amss
of the observations.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 28-Feb-2014