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J/A+A/613/A76  Relative radial velocities and K2 fluxes of K2-132 (Jones+, 2018)

A hot Saturn on an eccentric orbit around the giant star K2-132. Jones M.I., Brahm R., Espinoza N., Jordan A., Rojas F., Rabus M., Drass H., Zapata A., Soto M.G., Jenkins J.S., Vuckovic M., Ciceri S., Sarkis P. <Astron. Astrophys. 613, A76 (2018)> =2018A&A...613A..76J (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ; Photometry Keywords: techniques: radial velocities - planet-star interactions - planets and satellites: general Abstract: Although the majority of radial velocity detected planets have been found orbiting solar-type stars, a fraction of them have been discovered around giant stars. These planetary systems have revealed different orbital properties when compared to solar-type star companions. In particular, radial velocity surveys have shown that there is a lack of giant planets in close-in orbits around giant stars, in contrast to the known population of hot Jupiters orbiting solar-type stars. It has been theorized that the reason for this distinctive feature in the semimajor axis distribution is the result of the stellar evolution and/or that it is due to the effect of a different formation/evolution scenario for planets around intermediate-mass stars. However, in the past few years a handful of transiting short-period planets (P≲10-days) have been found around giant stars, thanks to the high-precision photometric data obtained initially by the Kepler mission, and later by its two-wheel extension K2. These new discoveries have allowed us for the first time to study the orbital properties and physical parameters of these intriguing and elusive substellar companions. In this paper we report on an independent discovery of a transiting planet in field 10 of the K2 mission, also reported recently by Grunblatt et al. (2017AJ....154..254G). The host star has recently evolved to the giant phase, and has the following atmospheric parameters: Teff=4878±70K, logg=3.289±0.004, and [Fe/H]=-0.11±0.05dex. The main orbital parameters of K2-132 b, obtained with all the available data for the system are: P=9.1708±0.0025d, e=0.290±0.049, Mp=0.495±0.007MJ and Rp=1.089±0.006RJ. This is the fifth known planet orbiting any giant star with a<0.1, and the most eccentric one among them, making K2-132 b a very interesting object. Description: Here we present relative radial velocity measurements and detrended and normalized photometric data of K2-132 used to detect the planet transits. These velocities were computed from FEROS and HARPS spectra, using the CERES pipeline (see Brahm et al. 2017PASP..129c4002B). The photometric data were obtained using our implementation of the EVEREST algorithm (Luger et al., 2016AJ....152..100L). Objects: ------------------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------------------ 12 08 39.93 -08 44 49.7 K2-132 = EPIC 228754001 ------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 34 13 Relative radial velocities of K2-132 table3.dat 23 2403 Detrended and normalized photometric data of K2-132
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 13 F13.7 d BJD Barycentric Julian Date (BJD-2400000) 15- 21 F7.4 km/s RV Relative radial velocity 23- 28 F6.4 km/s e_RV 1sigma uncertainty in RV 30- 34 A5 --- Inst Instrument (HARPS or FEROS)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 13 F13.5 d BJD Barycentric Julian Date 16- 23 F8.6 --- Rflux Detrended K2 photometry (relative flux)
Acknowledgements: Matias Jones, mjones(at)eso.org
(End) Patricia Vannier [CDS] 12-Jun-2018
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