J/A+A/571/A37 KOI-1257 photometric and velocimetric data (Santerne+, 2014)
SOPHIE velocimetry of Kepler transit candidates.
XII. KOI-1257 b: a highly eccentric three-month period transiting exoplanet.
Santerne A., Hebrard G., Deleuil M., Havel M., Correia A.C.M.,
Almenara J.-M., Alonso R., Arnold L., Barros S.C.C., Behrend R.,
Bernasconi L., Boisse I., Bonomo A.S., Bouchy F., Bruno G.,
Damiani C., Diaz R.F., Gravallon D., Guillot T., Labrevoir O.,
Montagnier G., Moutou C., Rinner C., Santos N.C., Abe L., Audejean M.,
Bendjoya P., Gillier C., Gregorio J., Martinez P., Michelet J.,
Montaigut R., Poncy R., Rivet J.-P., Rousseau G., Roy R., Suarez O.,
Vanhuysse M., Verilhac D.
<Astron. Astrophys. 571, A37 (2014)>
=2014A&A...571A..37S 2014A&A...571A..37S
ADC_Keywords: Stars, double and multiple ; Photometry, CCD ; Radial velocities ;
Line Profiles
Keywords: planetary systems - techniques: photometric -
techniques: radial velocities - techniques: spectroscopic -
methods: data analysis - stars: individual: KOI-1257 Ab
Abstract:
In this paper we report a new transiting warm giant planet: KOI-1257b.
It was first detected in photometry as a planet-candidate by the
Kepler space telescope and then validated thanks to a radial velocity
follow-up with the SOPHIE spectrograph. It orbits its host star with a
period of 86.647661d±3s and a high eccentricity of 0.772±0.045.
The planet transits the main star of a metal-rich, relatively old
binary system with stars of mass of 0.99±0.05M☉ and
0.70±0.07M☉ for the primary and secondary, respectively. This
binary system is constrained thanks to a self-consistent modelling of
the Kepler transit light curve, the SOPHIE radial velocities, line
bisector and full-width half maximum (FWHM) variations, and the
spectral energy distribution. However, future observations are needed
to confirm it. The PASTIS fully-Bayesian software was used to validate
the nature of the planet and to determine which star of the binary
system is the transit host. By accounting for the dilution from the
binary both in photometry and in radial velocity, we find that the
planet has a mass of 1.45±0.35Mjup, and a radius of
0.94±0.12Rjup, and thus a bulk density of 2.1±1.2g/cm3. The
planet has an equilibrium temperature of 511±50K, making it one of
the few known members of the warm-Jupiter population. The HARPS-N
spectrograph was also used to observe a transit of KOI-1257b,
simultaneously with a joint amateur and professional photometric
follow-up, with the aim of constraining the orbital obliquity of the
planet. However, the Rossiter-McLaughlin effect was not clearly
detected, resulting in poor constraints on the orbital obliquity of
the planet.
Objects:
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RA (ICRS) DE Designation(s)
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19 24 54.04 +44 55 38.6 2MASS J19245404+4455385 = KOI-1257
19 32 21.59 +69 39 40.2 σ Dra = HD 185144
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
phot.dat 35 450 Photometric observations of KOI-1257
rvkoi.dat 78 41 SOPHIE and HARPS-N radial velocities of KOI-1257
rvconst.dat 61 299 SOPHIE radial velocities of the constant star
HD185144
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See also:
J/A+A/528/A63 : Velocitometry transit of KOI-428b (Santerne+, 2011)
J/A+A/544/L12 : Velocitometry transit of KOI-13 (Santerne+, 2012)
Byte-by-byte Description of file: phot.dat
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Bytes Format Units Label Explanations
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1- 7 F7.5 d Time Barycentric Dynamical Julian Date (BJD-2456560)
10- 15 F6.4 --- Flux [0.9776/1.0232] Normalised flux
18- 23 F6.4 --- e_Flux Uncertainty on the normalised flux
25- 35 A11 --- Inst Instrument (1)
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Note (1): the instruments are:
--------------------------------------
Inst IAUcode Aper. fRatio Filter
--------------------------------------
OHP-T120 511 1.2m f/5 r
IAC80 954 80cm f/11.3 clear
ROTAT 511 60cm f/3.2 R
MOOS J43 50cm f/3 clear
Engarouines A14 50cm f/3 R
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Byte-by-byte Description of file: rvkoi.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d Time Barycentric Dynamical Julian Date
15- 21 F7.4 km/s RV [3.1/10.2] Radial velocity value
23- 28 F6.4 km/s e_RV [0.01/0.05] Radial velocity uncertainty
30- 36 F7.4 km/s Vspan Bisector span as defined in Boisse et al.
(2011A&A...528A...4B 2011A&A...528A...4B)
38- 43 F6.4 km/s e_Vspan [0.02/0.09] Uncertainty on Vspan
45- 51 F7.4 km/s FWHM Full Width Half Maximum of the CCF
53- 58 F6.4 km/s e_FWHM FWHM uncertainty
60- 63 I4 s Texp Exposure time
65- 66 I2 --- SNR [8/22] Signal-to-noise ratio per pixel at 550nm
68 I1 --- Moon [0/1] Presence of the Moon flag
70- 78 A9 --- Inst Instrument ("HARPS-N" or "SOPHIE HE")
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Byte-by-byte Description of file: rvconst.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d Time Barycentric Dynamical Julian Date
15- 21 F7.4 km/s RV Radial velocity value
23- 28 F6.4 km/s e_RV Radial velocity uncertainty
30- 36 F7.4 km/s Vspan Bisector span as defined in Boisse et al.
(2011A&A...528A...4B 2011A&A...528A...4B)
38- 43 F6.4 km/s e_Vspan Uncertainty on Vspan
45- 50 F6.4 km/s FWHM Full Width Half Maximum of the CCF
52- 57 F6.4 km/s e_FWHM FWHM uncertainty
59- 61 I3 --- SNR Signal-to-noise ratio per pixel at 550nm
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Acknowledgements:
Alexandre Santerne, alexandre.santerne(at)astro.up.pt
References:
Ehrenreich et al., Paper I 2011A&A...525A..85E 2011A&A...525A..85E
Santerne et al., Paper II 2011A&A...528A..63S 2011A&A...528A..63S, Cat. J/A+A/528/A63
Bouchy et al., Paper III 2011A&A...533A..83B 2011A&A...533A..83B
Santerne et al., Paper IV 2011A&A...536A..70S 2011A&A...536A..70S
Bonomo et al., Paper V 2012A&A...538A..96B 2012A&A...538A..96B
Santerne et al., Paper VI 2012A&A...544L..12S 2012A&A...544L..12S, Cat. J/A+A/544/L12
Santerne et al., Paper VII 2012A&A...545A..76S 2012A&A...545A..76S
Diaz et al., Paper VIII 2013A&A...551L...9D 2013A&A...551L...9D
Moutou et al., Paper IX 2013A&A...558L...6M 2013A&A...558L...6M
Barros et al., Paper X 2014A&A...561L...1B 2014A&A...561L...1B
Deleuil et al., Paper XI 2014A&A...564A..56D 2014A&A...564A..56D
(End) Alexandre Santerne [CAUP, Portugal], Patricia Vannier [CDS] 04-Nov-2014