J/AJ/159/44 RV curve of the metal-rich exoplanet host star XO-7 (Crouzet+, 2020)
XO-7b: a transiting hot Jupiter with a massive companion on a wide orbit.
Crouzet N., Healy B.F., Hebrard G., McCullough P.R., Long D., Montanes-
Rodriguez P., Ribas I., Vilardell F., Herrero E., Garcia-Melendo E.,
Conjat M., Foote J., Garlitz J., Vo P., Santos N.C., de Bruijne J.,
Osborn H.P., Dalal S., Nielsen L.D.
<Astron. J., 159, 44 (2020)>
=2020AJ....159...44C 2020AJ....159...44C
ADC_Keywords: Radial velocities; Stars, G-type; Exoplanets; Optical
Keywords: Exoplanet astronomy ; Exoplanets ; Extrasolar gas giants ;
Hot Jupiters ; Transits ; Transit photometry ; Transit instruments ;
Exoplanet systems ; High resolution spectroscopy ; Surveys ;
Visible astronomy ; Radial velocity
Abstract:
Transiting planets orbiting bright stars are the most favorable
targets for follow-up and characterization. We report the discovery of
the transiting hot Jupiter XO-7b and of a second, massive companion on
a wide orbit around a circumpolar, bright, and metal-rich G0 dwarf
(V=10.52, Teff=6250±100K, [Fe/H]=0.432±0.057dex). We
conducted photometric and radial velocity follow-up with a team of
amateur and professional astronomers. XO-7b has a period of
2.8641424±0.0000043days, a mass of 0.709±0.034MJ, a radius
of 1.373±0.026RJ, a density of 0.340±0.027g/cm3, and an
equilibrium temperature of 1743±23K. Its large atmospheric scale
height and the brightness of the host star make it well suited to
atmospheric characterization. The wide-orbit companion is detected as
a linear trend in radial velocities with an amplitude of ∼100m/s over
two years, yielding a minimum mass of 4MJ; it could be a planet, a
brown dwarf, or a low-mass star. The hot Jupiter orbital parameters
and the presence of the wide-orbit companion point toward a
high-eccentricity migration for the hot Jupiter. Overall, this system
will be valuable to understand the atmospheric properties and
migration mechanisms of hot Jupiters and will help constrain the
formation and evolution models of gas giant exoplanets.
Description:
Radial velocity (RV) measurements were obtained between 2016 July 23
and 2018 July 4 with the SOPHIE spectrograph at the 193cm telescope of
Observatoire de Haute-Provence (OHP), France. We used its
High-Resolution mode (resolving power R=75000). Exposure times were
around 13min allowing signal-to-noise ratios of around 27 per pixel at
550nm to be reached on most of the exposures.
Objects:
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RA (ICRS) DE Designation(s)
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18 29 54.93 +85 13 59.6 XO-7 = TYC 4652-1593-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 32 49 Radial velocity measurements of the host star XO-7
obtained with the SOPHIE spectrograph
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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)
III/231 : The Tycho-2 Spectral Type Catalog (Wright+, 2003)
II/328 : AllWISE Data Release (Cutri+, 2013)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
VI/135 : All-sky spectrally matched Tycho2 stars (Pickles+, 2010)
J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)
J/A+A/487/373 : Spectroscopic parameters of 451 HARPS-GTO stars (Sousa+, 2008)
J/A+A/505/853 : HD16760 radial velocity curve (Bouchy+, 2009)
J/ApJ/707/446 : HAT-P-13 photometry follow-up (Bakos+, 2009)
J/A+A/513/A69 : HD9446 radial velocity curve (Hebrard+, 2010)
J/A+A/523/A88 : A Jupiter-mass companion around HD 109246 (Boisse+, 2010)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/A+A/538/A113 : Extrasolar planets Radial velocities of 8 stars (Diaz+ 2012)
J/A+A/545/A55 : Extrasolar planets Radial velocities 5 stars (Boisse+, 2012)
J/ApJ/757/18 : Radial velocities 16 hot Jupiter host stars (Albrecht+, 2012)
J/A+A/556/A150 : SWEETCat I. Stellar parameters for host stars (Santos+, 2013)
J/A+A/563/A22 : Radial velocities of 3 new hot Jupiters (Moutou+, 2014)
J/ApJ/785/126 : HIRES radial velocity measurements (Knutson+, 2014)
J/ApJ/809/77 : Transiting Exoplanet Survey Satellite (TESS) (Sullivan+, 2015)
J/A+A/585/A46 : Extrasolar planets Radial velocities 5 stars (Bouchy+, 2016)
J/A+A/588/A145 : Radial velocities 8 stars with giant planets (Hebrard+, 2016)
J/A+A/591/A55 : Five transiting Jupiters discovered using WASP (Maxted+, 2016)
J/A+A/600/A30 : Limb-darkening for TESS satellite (Claret, 2017)
J/A+A/601/A9 : HD17674, HD29021, and HD42012 radial velocities (Rey+, 2017)
J/A+A/618/A103 : Gl617A and Gl96 radial velocity curves (Hobson+, 2018)
J/AJ/156/216 : Differential photometry & RVs of HATS-59 (Sarkis+, 2018)
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 --- BJD [57593/58304] Reduced Barycentric Julian Date;
BJD-2400000
12- 18 F7.5 --- Phase [0.05/0.95] Orbital phase (1)
20- 26 F7.3 km/s RV [-13.2/-12.8] Radial velocity
28- 32 F5.3 km/s e_RV [0.008/0.03] Error on RV (σ)
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Note (1): The orbital phase is 0 at mid-transit.
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History:
From electronic version of the journal
(End) Prepared by Coralie Fix [CDS], 31-Mar-2020