J/A+A/605/L11 YZ Ceti radial velocity curve (Astudillo-Defru+, 2017)
The HARPS search for southern extra-solar planets.
XLII. A system of Earth-mass planets around the nearby M dwarf YZ Ceti.
Astudillo-Defru N., Diaz R.F., Bonfils X., Almenara J.M., Delisle J.-B.,
Bouchy F., Delfosse X., Forveille T., Lovis C., Mayor M., Murgas F.,
Pepe F., Santos N.C., Segransan D., Udry S., Wunsche A.
<Astron. Astrophys. 605, L11 (2017)>
=2017A&A...605L..11A 2017A&A...605L..11A (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities
Keywords: stars: individual: YZ Cet - planetary systems -
stars: late-type - technique: radial velocities
Abstract:
Exoplanet surveys have shown that systems with multiple low-mass
planets on compact orbits are common. Except for a few cases, however,
the masses of these planets are generally unknown. At the very end of
the main sequence, host stars have the lowest mass and hence offer the
largest reflect motion for a given planet. In this context, we
monitored the low-mass (0.13M☉) M dwarf YZ Cet (GJ 54.1,
HIP 5643) intensively and obtained radial velocities and
stellar-activity indicators derived from spectroscopy and photometry,
respectively. We find strong evidence that it is orbited by at least
three planets in compact orbits (Porb=1.97, 3.06, 4.66 days), with
the inner two near a 2:3 mean-motion resonance. The minimum masses are
comparable to the mass of Earth (Msini=0.75±0.13, 0.98±0.14, and
1.14±0.17M{earth}), and they are also the lowest masses measured
by radial velocity so far. We note the possibility for a fourth planet
with an even lower mass of Msini=0.472±0.096 Mearth at
Porb=1.04-days. An n-body dynamical model is used to place further
constraints on the system parameters. At 3.6 parsecs, YZ Cet is the
nearest multi-planet system detected to date.
Description:
We acquired spectra with HARPS, a stabilized high-resolution
spectrograph specifically designed to compute precise radial
velocities. It is an ESO instrument installed at La Silla observatory.
Objects:
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RA (2000) DE Designation(s)
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01 12 30.64 -16 59 56.3 YZ Cet = V* YZ Cet
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb4.dat 73 213 Radial velocities time series for YZ Cet
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Byte-by-byte Description of file: tableb4.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d BJD Barycentric Julian date (BJD-2400000)
14- 21 F8.5 km/s RV Radial velocity
23- 29 F7.5 km/s sigma Radial velocity dispersion
31- 37 F7.5 km/s FWHM FWHM of the cross-correlation function
39- 46 F8.5 --- Contrast Contrast of the cross-correlation function
48- 56 F9.5 km/s BIS Bisector span of the cross-correlation function
58- 65 F8.5 --- S-index S-index
67- 73 F7.5 --- Ha Halpha index
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Acknowledgements:
Nicola Astudillo-Defru, nicola.astudillo(at)unige.ch
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(End) Patricia Vannier [CDS] 31-Aug-2017