J/A+A/612/A95 K2-141 b radial velocity and light curve (Barragan+, 2018)
K2-141 b: a 5-MEarth super-Earth Transiting a K7 V star every 6.7 h.
Barragan O., Gandolfi D., Dai F., Livingston J., Persson C.M., Hirano T.,
Narita N., Csizmadia Sz., Winn J.N., Nespral D., Prieto-Arranz J.,
Smith A.M.S., Nowak G., Albrecht S., Antoniciello G., Bo Justesen A.,
Cabrera J., Cochran W.D., Deeg H.., Eigmuller P., Endl M., Erikson A.,
Fridlund M., Fukui A., Grziwa S., Guenther E., Hatzes A.P., Hidalgo D.,
Johnson M.C., Korth J., Palle E., Patzold M., Rauer H., Tanaka Y.,
Van Eylen V.
<Astron. Astrophys. 612, A95 (2018)>
=2018A&A...612A..95B 2018A&A...612A..95B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Stars, K-type ; Planets ;
Photometry ; Radial velocities
Keywords: planetary systems -
planets and satellites: individual: EPIC 246393474 b -
stars: fundamental parameters -
stars: individual: EPIC 246393474 - techniques: photometric -
techniques: radial velocities
Abstract:
We report on the discovery of K2-141 b (EPIC 246393474 b), an
ultra-short-period super-Earth on a 6.7-hour orbit transiting an
active K7 V star based on data from K2 campaign 12. We confirmed the
planet's existence and measured its mass with a series of follow-up
observations: seeing-limited MuSCAT imaging, NESSI high-resolution
speckle observations, and FIES and HARPS high-precision
radial-velocity monitoring. K2-141 b has a mass of
5.31±0.46M⊕ and radius of 1.54+0.10-0.09R⊕,
yielding a mean density of 8.00+1.83-1.45g/cm3 and suggesting a
rocky-iron composition. Models indicate that iron cannot exceed ∼70%
of the total mass. With an orbital period of only 6.7 hours, K2-141 b
is the shortest-period planet known to date with a precisely
determined mass.
Description:
Light curve and radial velocities for K2-141 (EPIC 246393474). Light
curve comes from campaing 12 of the extended Kepler mission, K2.
Radial velocity data was obtained with HARPS at th3 3.6m telescope,
ESO. FIES data comes from observations at the Nordic Optical Telescope
(NOT).
Objects:
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RA (2000) DE Designation(s)
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23 23 39.97 -01 11 21.4 K2-141 = 2MASS J23233996-0111215
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rvharps.dat 62 25 HARPS RV measurements
rvfies.dat 36 9 FIES RV measurements
lck2.dat 26 3353 K2 data
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Byte-by-byte Description of file: rvharps.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d BJD Time (BJD-2450000)
13- 19 F7.4 km/s RV Radial velocity
21- 26 F6.4 km/s e_RV Radial velocity error
28- 33 F6.4 km/s BIS Bisector
35- 40 F6.4 km/s FWHM Full Width Half Maximum
42- 46 F5.3 --- S S-index
48- 52 F5.3 --- e_S S-index error
54- 57 I4 s Texp Exposure time
59- 62 F4.1 --- SN Signal-to-Noise at 5500Å
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Byte-by-byte Description of file: rvfies.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d BJD Time (BJD-2450000)
13- 19 F7.4 km/s RV Radial velocity
21- 26 F6.4 km/s e_RV Radial velocity error
28- 31 I4 s Texp Exposure time
33- 36 F4.1 --- SN Signal-to-Noise at 5500Å
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Byte-by-byte Description of file: lck2.dat
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Bytes Format Units Label Explanations
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1- 14 F14.9 d BJD Time (BJD-2450000)
16- 26 F11.9 --- Flux Normalized stellar flux
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Acknowledgements:
Oscar Barragan, oscaribv(at)gmail.com
(End) Oscar Barragan [UniTo, Italy], Patricia Vannier [CDS] 22-Jan-2018