J/ApJ/749/134 HAT-P-17 radial velocities and light curves (Howard+, 2012)
HAT-P-17b,c: a transiting, eccentric, hot Saturn and a long-period, cold
Jupiter.
Howard A.W., Bakos G.A., Hartman J., Torres G., Shporer A., Mazeh T.,
Kovacs G., Latham D.W., Noyes R.W., Fischer D.A., Johnson J.A., Marcy G.W.,
Esquerdo G.A., Beky B., Butler R.P., Sasselov D.D., Stefanik R.P.,
Perumpilly G., Lazar J., Papp I., Sari P.
<Astrophys. J., 749, 134 (2012)>
=2012ApJ...749..134H 2012ApJ...749..134H
ADC_Keywords: Photometry ; Radial velocities ; Stars, double and multiple ;
Planets
Keywords: planetary systems - stars: individual (HAT-P-17, GSC 2717-00417) -
techniques: photometric - techniques: spectroscopic
Abstract:
We report the discovery of HAT-P-17b,c, a multi-planet system with an
inner transiting planet in a short-period, eccentric orbit and an
outer planet in a 4.4 yr, nearly circular orbit. The inner planet,
HAT-P-17b, transits the bright V=10.54 early K dwarf star
GSC 2717-00417, with an orbital period P=10.338523±0.000009 days,
orbital eccentricity e=0.342±0.006, transit epoch
Tc=2454801.16943±0.00020 (BJD: barycentric Julian dates throughout
the paper are calculated from Coordinated Universal Time (UTC)), and
transit duration 0.1690±0.0009 days. HAT-P-17b has a mass of
0.534±0.018MJ and radius of 1.010±0.029RJ yielding a mean
density of 0.64±0.05g/cm3. This planet has a relatively low
equilibrium temperature in the range 780-927K, making it an attractive
target for follow-up spectroscopic studies. The outer planet,
HAT-P-17c, has a significantly longer orbital period P2=1610±20d
and a minimum mass m2sini2=1.31+0.18-0.15MJ. The orbital
inclination of HAT-P-17c is unknown as transits have not been observed
and may not be present. The host star has a mass of
0.86±0.04M☉, radius of 0.84±0.02R☉, effective
temperature 5246±80K, and metallicity [Fe/H]=0.00±0.08. HAT-P-17
is the second multi-planet system detected from ground-based transit
surveys.
Description:
For HAT-P-17, we obtained eight observations with the
Harvard-Smithsonian Center for Astrophysics (CfA) Digital Speedometer
(DS) mounted on the FLWO 1.5m telescope between September and November
of 2007. The velocity measurements showed an rms residual of 0.60km/s,
consistent with no detectable RV variation within the precision of the
measurements. Given the significant transit detection by HATNet, and
the encouraging DS results that rule out obvious false positives, we
proceeded with the follow-up of this candidate by obtaining
high-resolution, high-S/N spectra to characterize the RV variations,
and to refine the determination of the stellar parameters. For this we
used HIRES on the Keck I telescope located on Mauna Kea, Hawaii,
between 2007 October and 2010 April. The width of the spectrometer
slit was 0.86", resulting in a resolving power of l/dl∼55000, with a
wavelength coverage of ∼3800-8000Å.
In order to permit a more accurate modeling of the light curve, we
conducted additional photometric observations using a variety of
facilities, including: the KeplerCam CCD camera on the FLWO 1.2m
telescope, the 0.6m Schmidt telescope of Konkoly Observatory at the
Piszkesteto Mountain Station, and the 0.46m and 1.0m telescopes at
Wise Observatory. We observed three transit events of HAT-P-17 with
the FLWO 1.2m telescope on the nights of 2007 December 14, 2008
October 19, and 2009 October 16 (in Sloan z and i bands), while the
event on 2008 September 8 was observed simultaneously at Konkoly
Observatory and with the two telescopes at Wise Observatory (in I and
R bands).
Objects:
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RA (2000) DE Designation(s) (Period)
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21 38 08.73 +30 29 19.4 HAT-P-17 = TYC 2717-417-1 (P=10.338523)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 50 43 Relative radial velocities, bisector spans, and
activity index measurements of HAT-P-17
table3.dat 38 2795 High-precision differential photometry of HAT-P-17
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See also:
J/A+A/558/A106 : Transit hosts and surface gravity (Mortier+, 2013)
J/A+A/558/A86 : HAT-P-42b and HAT-P-43b ri light curves (Boisse+, 2013)
J/ApJ/735/24 : HAT-P-30 follow-up photometry (Johnson+, 2011)
J/ApJ/725/2017 : Sloan i-band light curve of HAT-P-24 (Kipping+, 2010)
J/ApJ/696/1950 : Sloan iz light curves of HAT-P-10 (Bakos+, 2009)
J/ApJ/706/785 : HAT-P-12 light curve (Hartman+, 2009)
http://exoplanets.org/ : Exoplanet orbit database
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-2450000)
12- 18 F7.2 m/s RV [-104/57]? Radial velocity (1)
20- 23 F4.2 m/s e_RV [1/3]? RV 1σ uncertainty (2)
25- 30 F6.2 m/s BS [-22/11]? Bisector span
32- 35 F4.2 m/s e_BS [4/8]? BS 1σ uncertainty
37- 42 F6.4 --- S [0.0044/0.005]? Relative chromospheric
activity index (3)
44- 50 F7.5 --- e_S ? 1σ uncertainty in S
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Note (1): The zero point of these velocities is arbitrary. An overall
offset γrel fitted to these velocities in Section 3.3 has not
been subtracted.
Note (2): Internal errors excluding the component of astrophysical jitter
considered in Section 3.3.
Note (3): Relative chromospheric activity index, not calibrated to the
scale of Vaughan et al. (1978PASP...90..267V 1978PASP...90..267V).
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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- 10 F10.5 d BJD Barycentric Julian Date (BJD-2450000)
12- 19 F8.5 mag mag [-0.013/0.034] Differential magnitude (1)
21- 27 F7.5 mag e_mag [0.0003/0.002] The 1σ error in mag
29- 36 F8.5 mag Omag [7.39/10.02] Original, observed magnitude (2)
38 A1 --- Filt [IRiz] Filter used (I for Konkoly Schmidt 0.6m,
R for Wise 0.46m and 1m, and z or i for
KeplerCam/FLWO 1.2m)
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Note (1): The out-of-transit level has been subtracted. These magnitudes
have been subjected to the EPD and TFA procedures, carried out
simultaneously with the transit fit.
Note (2): Without 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] 27-Nov-2013