J/A+A/702/A121 Time series data of GJ 536 (Suarez Mascareno+, 2025)
A second low-mass planet orbiting the nearby M-dwarf GJ 536.
Suarez Mascareno A., del Burgo C., Delisle J.-B., Gonzalez Hernandez J.I.,
Hara N.C., Mestre J.M., Nari N., Rebolo R., Stefanov A.K., Burt J.A.
<Astron. Astrophys. 702, A121 (2025)>
=2025A&A...702A.121S 2025A&A...702A.121S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ;
Photometry
Keywords: planets and satellites: detection - stars: low-mass -
planetary systems - stars: individual: GJ 536
Abstract:
GJ 536 is a low-mass star, located 10pc away from the Sun, that hosts
a low-mass planet orbiting with a period of 8.71 days. Based on an
analysis of the radial velocity (RV) time series obtained from the
available data of the spectrographs HARPS, HARPS-N, CARMENES and
HIRES, we announce the discovery of a second low-mass planet orbiting
the star. We performed a RV global analysis on RV, spectroscopic
activity indicators, and ASAS photometry, within the multidimensional
Gaussian process framework, updated the parameters of GJ 536 b, and
found significant evidence of the presence of a second planet.
GJ 536 c is a low-mass planet (mp*sini=5.89±0.70M⊕),
orbiting with a period of 32.761±0.015 days, at a distance of
0.1617±0.0028au from its parent star. It induces an RV
semi-amplitude of 1.80±0.20m/s. Given its distance to the star, it
receives a flux of 1.692±0.069F⊕, for an equilibrium
temperature of 290.5±9.5K. We update the mass of the planet GJ 536 b
to mp*sini=6.37±0.38M⊕. The orbits of both planets are
consistent with circular. We explored the use of statistical Doppler
imaging on the photometric and RV data, and find a tentative projected
obliquity of the stellar rotation axis of 58+16-19deg. Current
evidence does not support the presence of additional planets with
masses>5M⊕for orbital periods up to 100days, or >10M⊕
for periods up to 1000 days.
Description:
Spectroscopic and photometric time series of GJ 536 obtained with
HARPS, HARPS-N, CARMENES, HIRES, and ASAS-3.
Objects:
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RA (2000) DE Designation(s)
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14 01 03.18 -02 39 17.5 GJ 536 = HD 122303
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
spec.dat 120 236 Spectroscopic data
phot.dat 32 352 Photometric data
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See also:
J/A+A/597/A108 : GJ 536 HARPS and HARPS-N data (Suarez Mascareno+, 2017)
Byte-by-byte Description of file: spec.dat
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Bytes Format Units Label Explanations
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3- 10 F8.3 d BJD Barycentric Julian date (BJD-2450000)
17- 21 F5.2 m/s dRV Relative radial velocity
29- 32 F4.2 m/s e_dRV Relative radial velocity uncertainty
36- 43 F8.6 --- Smw ?=0 S-index (1)
47- 54 F8.6 --- e_Smw ?=0 S-index uncertainty (1)
60- 65 F6.2 m/s dFWHM ?=0 Relative FWHM variation (2)
72- 76 F5.2 m/s e_dFWHM ?=0 Relative FWHM variation uncertainty (2)
83- 87 F5.1 --- CRX ?=0 Chromatic RV slope (2)
95- 98 F4.1 --- e_CRX ?=0 Chromatic RV slope uncertainty (2)
103-109 F7.3 km/s BERV ?=0 Barycentric Earth Radial Velocity (2)
120 A1 --- Inst [01234] Instrument (3)
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Note (1): CARMENES data do not have S-index measurement
Note (2): HIRES data do not have FWHM, Chromatic slope, or Barycentric RV
measurements
Note (3): Instruments as follows:
0 = HARPS pre-upgrade
1 = HARPS post-upgrade
2 = HARPS-N
3 = CARMENES
4 = HIRES
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Byte-by-byte Description of file: phot.dat
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Bytes Format Units Label Explanations
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2- 10 F9.4 d BJD Barycentric Julian date (BJD-2450000)
17- 21 F5.1 10-3 dFLUX Relative flux variations (in ppt)
29- 32 F4.1 10-3 e_dFLUX Relative flux variations uncertainty (in ppt)
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Acknowledgements:
Alejandro Suarez Mascareno, asm(at)iac.es
(End) Patricia Vannier [CDS] 11-Sep-2025