J/ApJ/724/866 Follow-up observations of HAT-P-15 (Kovacs+, 2010)
HAT-P-15b: a 10.9 day extrasolar planet transiting a solar-type star.
Kovacs G., Bakos G.A., Hartman J.D., Torres G., Noyes R.W., Latham D.W.,
Howard A.W., Fischer D.A., Johnson J.A., Marcy G.W., Isaacson H.,
Sasselov D.D., Stefanik R.P., Esquerdo G.A., Fernandez J.M., Lazar B.B.J.,
Papp I., Sari P.
<Astrophys. J., 724, 866-877 (2010)>
=2010ApJ...724..866K 2010ApJ...724..866K
ADC_Keywords: Photometry, SDSS ; Planets ; Stars, double and multiple ;
Stars, G-type
Keywords: planetary systems - stars: individual (HAT-P-15) -
techniques: photometric - techniques: spectroscopic
Abstract:
We report the discovery of HAT-P-15b, a transiting extrasolar planet
in the "period valley," a relatively sparsely populated period regime
of the known extrasolar planets. The host star, GSC 2883-01687, is a
G5 dwarf with V=12.16. It has a mass of 1.01±0.04M☉, radius of
1.08±0.04R☉, effective temperature 5568±90K, and metallicity
[Fe/H]=+0.22±0.08. The planetary companion orbits the star with a
period P=10.863502±0.000027 days, transit epoch
Tc=2454638.56019±0.00048(BJD), and transit duration
0.2285±0.0015days. It has a mass of 1.946±0.066MJ and radius of
1.072±0.043RJ yielding a mean density of 1.96±0.22g/cm3. At an
age of 6.8+2.5-1.6Gyr, the planet is H/He-dominated and
theoretical models require about 2% (10M{earth}) worth of heavy
elements to reproduce its measured radius. With an estimated
equilibrium temperature of ∼820K during transit, and ∼1000K at
occultation, HAT-P-15b is a potential candidate to study moderately
cool planetary atmospheres by transmission and occultation
spectroscopy.
Description:
The transits of HAT-P-15b were detected with the HAT-6 telescope in
Arizona and the HAT-9 telescope in Hawaii. The region around GSC
2883-01687, a field internally labeled as G170, was observed on a
nightly basis between 2005 September and 2006 February. We gathered
8538 images with an exposure time of 5 minutes.
To obtain high-resolution and high-S/N spectra for characterizing the
RV variations and to determine the stellar parameters with higher
precision, we used the HIRES instrument on the Keck I telescope
located on Mauna Kea, Hawaii. We obtained 24 exposures with an iodine
cell and one iodine-free template. The observations were made on 21
nights during a number of observing runs between 2007 August 24 and
2009 December 28.
Photometric follow-up observations of HAT-P-15 were obtained in the
Sloan z filter in 2007 dec 18, 2007 dec 29 and 2008 Jan 9 and in Sloan
i filter in 2008 Oct 17.
Objects:
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RA (2000) DE Designation(s) (Period)
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04 24 59.54 +39 27 38.3 HAT-P-15 = GSC 2883-01687 (P=10.8635)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 52 25 Relative RV, bisector, and activity indices of
HAT-P-15
table3.dat 40 1789 Photometric follow-up of HAT-P-15
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See also:
II/271 : TASS Mark IV patches photometric catalog, version 2 (Droege+, 2007)
III/159 : Ca II H and K Measurements Made at MWO (Duncan+ 1991)
J/MNRAS/422/2024 : X-ray-age relation and exoplanet (Jackson+, 2012)
J/MNRAS/414/108 : Calibrator of exoplanet-host stars (Beust+, 2011)
J/MNRAS/411/L46 : Exoplanet magnetic fields (Vidotto+, 2011)
J/MNRAS/414/1278 : Eccentricities of transiting planets (Pont+, 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.5 d BJD Barycentric Julian Date (BJD-2454000)
11 A1 --- f_BJD Flag on BJD (1)
13- 19 F7.2 m/s RV ? Radial velocity (2)
21- 24 F4.2 m/s e_RV ? RV uncertainty (3)
26- 32 F7.2 m/s BS Bisector span (BS)
34- 38 F5.2 m/s e_BS BS uncertainty
40- 45 F6.4 --- S Mount Wilson activity S-index (4)
47- 52 F6.3 [-] logR'HK R'HK chromospheric activity index (4)
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Note (1): Flag as follows:
a = The exposure on BJD 2454339.13623 was iodine-free, therefore, no RV
item is given.
b = On BJD 2454370.97691, the scattered moonlight affected the derived
parameters very strongly, including RV. As a result, we left out this
observation from the analysis.
Note (2): The fitted zero point that is on an arbitrary scale (denoted as
γrel in Section 4.2) has been subtracted from the velocities.
Note (3): Formal errors, given by the data reduction pipeline.
Note (4): Activity indices calibrated to the scale of Duncan et al. (1991,
Cat. III/159).
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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 F12.5 d BJD Barycentric Julian Date (BJD-2400000)
14- 21 F8.5 mag mag Relative magnitude in Filt (1)
23- 29 F7.5 mag e_mag Error in mag
31- 38 F8.5 mag Rmag Raw magnitude in Filt (2)
40 A1 --- Filt [iz] Filter used in observation
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Note (1): The out-of-transit level has been subtracted. These magnitudes
have resulted from the EPD (External Parameter Decorrelation; see
Bakos et al. 2010ApJ...710.1724B 2010ApJ...710.1724B) and TFA (Trend Filtering Algorithm,
see Kovacs et al. 2005MNRAS.356..557K 2005MNRAS.356..557K) procedures, carried out
simultaneously with the transit fit.
Note (2): These are raw magnitude values without the application of the EPD
and TFA procedures.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 02-Aug-2012