J/AJ/154/123 Radial velocity follow-up of the HD 3167 system (Gandolfi+, 2017)
The transiting multi-planet system HD 3167: A 5.7 M{earth} super-Earth and
an 8.3 M{earth} mini-Neptune.
Gandolfi D., Barragan O., Hatzes A.P., Fridlund M., Fossati L., Donati P.,
Johnson M.C., Nowak G., Prieto-Arranz J., Albrecht S., Dai F., Deeg H.,
Endl M., Grziwa S., Hjorth M., Korth J., Nespral D., Saario J.,
Smith A.M.S., Antoniciello G., Alarcon J., Bedell M., Blay P., Brems S.S.,
Cabrera J., Csizmadia S., Cusano F., Cochran W.D., Eigmuller P., Erikson A.,
Gonzalez Hernandez J.I., Guenther E.W., Hirano T., Suarez Mascareno A.,
Narita N., Palle E., Parviainen H., Patzold M., Persson C.M., Rauer H.,
Saviane I., Schmidtobreick L., Van Eylen V., Winn J.N., Zakhozhay O.V.
<Astron. J., 154, 123 (2017)>
=2017AJ....154..123G 2017AJ....154..123G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, K-type ; Exoplanets ; Radial velocities ; Spectroscopy
Keywords: planets and satellites: detection -
planets and satellites: individual (HD 3167b, HD 3167c) -
stars: fundamental parameters - stars: individual (HD 3167)
Abstract:
HD 3167 is a bright (V=8.9 mag) K0 V star observed by NASA's K2 space
mission during its Campaign 8. It has recently been found to host two
small transiting planets, namely, HD 3167b, an ultra-short-period
(0.96 days) super-Earth, and HD 3167c, a mini-Neptune on a relatively
long-period orbit (29.85 days). Here we present an intensive radial
velocity (RV) follow-up of HD 3167 performed with the FIES@NOT,
m, and HARPS-N@TNG spectrographs. We revise the system
parameters and determine radii, masses, and densities of the two
transiting planets by combining the K2 photometry with our
spectroscopic data. With a mass of 5.69±0.44 M⊕, a radius of
1.574±0.054 R⊕, and a mean density of 8.00-0.98+1.10 g/cm3,
HD 3167b joins the small group of ultra-short-period planets known to
have rocky terrestrial compositions. HD 3167c has a mass of
8.33-1.85+1.79 M⊕ and a radius of
2.740-0.100+0.106 R⊕, yielding a mean density of
2.21-0.53+0.56 g/cm3, indicative of a planet with a composition
comprising a solid core surrounded by a thick atmospheric envelope.
The rather large pressure scale height (∼350 km) and the brightness of
the host star make HD 3167c an ideal target for atmospheric
characterization via transmission spectroscopy across a broad range of
wavelengths. We found evidence of additional signals in the RV
measurements but the currently available data set does not allow us to
draw any firm conclusions on the origin of the observed variation.
Description:
We used the FIbre-fed Echelle Spectrograph (FIES; Frandsen & Lindberg
1999anot.conf...71F; Telting et al. 2014AN....335...41T 2014AN....335...41T) mounted at
the 2.56 m Nordic Optical Telescope (NOT) of Roque de los Muchachos
Observatory (La Palma, Spain) to acquire 37 high-resolution spectra
(R∼67000) in 12 different nights between July and September 2016.
We also acquired 50 spectra with the HARPS spectrograph (R∼115000;
Mayor et al. 2003Msngr.114...20M 2003Msngr.114...20M) and 32 spectra with the HARPS-N
spectrograph (R∼115000; Cosentino et al. 2012SPIE.8446E..1VC). HARPS
and HARPS-N are fiber-fed cross-dispersed echelle spectrographs
specifically designed to achieve very high-precision long-term RV
stabilities (<1 m/s). They are mounted at the ESO-3.6 m telescope of
La Silla observatory (Chile) and at the 3.58 m Telescopio Nazionale
Galileo (TNG) of Roque de los Muchachos Observatory (La Palma, Spain).
Objects:
------------------------------------------------
RA (ICRS) DE Designation(s)
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00 34 57.52 +04 22 53.3 HD 3167 = HIP 2736
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . this file
table5.dat 68 114 FIES, HARPS, and HARPS-N Radial Velocity
Measurements and Activity Indicators of HD 3167
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See also:
J/ApJ/787/47 : 106 Kepler ultra-short-period planets (Sanchis-Ojeda+, 2014)
J/ApJ/829/L9 : K2 LC of HD 3167 and Robo-AO image (Vanderburg+, 2016)
J/ApJS/224/2 : K2 EPIC stellar properties for 138600 targets (Huber+, 2016)
J/AJ/154/122 : Radial velocities for the HD 3167 system (Christiansen+, 2017)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Inst Instrument (HARPS, FIES, HARPS-N)
9- 19 F11.6 d BJD Barycentric Julian Date (TDB, BJD-2450000)
21- 27 F7.4 km/s RV [-0.0178/19.5317] Radial velocity (1)
29- 34 F6.4 km/s e_RV [0.0004/0.0031] Uncertainty in RV
36- 42 F7.4 km/s BIS [-0.0415/-0.0246]? Cross-correlation function
bisector span
44- 49 F6.4 km/s FWHM [6.7021/6.788]? Cross-correlation function
Full-Width at Half Maximum
51- 56 F6.3 [-] logRHK [-5.126/-4.995]? Log Ca II H & K chromospheric
activity index log R'HK
58- 62 F5.3 [-] e_logRHK [0.004/0.02]? Uncertainty in logRHK
64- 68 F5.1 --- S/N [60.5/159.0] Signal-to-noise ratio per pixel
at 5500 Å
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Note (1): System velocity:
γHAPRS = 19.52311±0.00029
γHAPRS-N = 19.51471±0.00036
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 08-Jun-2018