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 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 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 2017PASP..129c4002B). The
photometric data were obtained using our implementation of the EVEREST
algorithm (Luger et al., 2016AJ....152..100L 2016AJ....152..100L).
Objects:
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RA (2000) DE Designation(s)
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12 08 39.93 -08 44 49.7 K2-132 = EPIC 228754001
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File Summary:
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FileName Lrecl Records Explanations
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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
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD Barycentric Julian Date
16- 23 F8.6 --- Rflux Detrended K2 photometry (relative flux)
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Acknowledgements:
Matias Jones, mjones(at)eso.org
(End) Patricia Vannier [CDS] 12-Jun-2018