J/AJ/164/238 Radial velocity of GJ 463 with HRS and HIRES (Endl+, 2022)
A Jupiter Analog Orbiting The Nearby M Dwarf GJ 463.
Endl M., Robertson P., Cochran W.D., MacQueen P.J., Bowler B.P.,
Franson K.E.,Holcomb R.,Beard C.,Isaacson H.,Howard A.W.,Lubin J.
<Astron. J., 164, 238 (2022)>
=2022AJ....164..238E 2022AJ....164..238E
ADC_Keywords: Stars, M-type; Exoplanets; Spectra, optical; Radial velocities
Keywords: Exoplanets ; Extrasolar gaseous planets
Abstract:
We report the detection of a long-period giant planetary companion to
the nearby M3V star GJ463 (=Ross690). The detection is based on over
ten years of highly-precise radial velocity measurements with the High
Resolution Spectrograph at the Hobby-Eberly Telescope and the HIRES
spectrograph at Keck. With an orbital period of 10yr and a minimum
mass of 1.55±0.15MJup, GJ463b has a comparable orbital period to
Jupiter and hence qualifies as a Jupiter analog around a low-mass
star. We demonstrate that the radial velocity signal is not produced
by a magnetic activity cycle of the host star. GJ463 was observed with
TESS, and we searched the light curve for any possible signals of
stellar or planetary origin, but detected none. This planet is a
candidate for possible direct detection with the coronagraph of the
upcoming Nancy Grace Roman Space Telescope. We compared Gaia EDR3 with
Hipparcos astrometry and detected a significant acceleration, which is
likely caused by this long-period planetary companion at
a=3.53±0.07au.
Description:
GJ463 was included in the M-dwarf radial velocity (RV) survey at the
Hobby-Eberly Telescope (HET). We used the High Resolution Spectrograph
(HRS) and a temperature-stabilized molecular iodine (I2) vapor cell
for simultaneous wavelength calibration and reconstruction of the
shape and asymmetry of the instrumental profile during the
observation. We collected 55 RV measurements from April 2008 to June
2013.
The second set of spectra we obtained with the High Resolution Echelle
Spectrometer (HIRES) spectrograph at the Keck I telescope. Again, we
employed the I2-cell calibration method for precise RV measurements.
We obtained 19 RV measurements with Keck/HIRES from 2010 January to
2022 January.
Objects:
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RA (2000) DE Designation(s) (Period)
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12 23 00.16 +64 01 50.9 GJ 463 = ASCC 129462 (P=3448d)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 29 70 Differential radial velocities for GJ 463
from HET/HRS and Keck/HIRES
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
J/A+A/327/1039 : Structure and evolution of low-mass stars (Chabrier+ 1997)
J/MNRAS/367/1329 : Elemental abundances for 176 stars (Reddy+, 2006)
J/MNRAS/432/1203 : Rotation periods of M-dwarf stars (McQuillan+, 2013)
J/ApJ/764/3 : Hα indices in M low-mass stars (Robertson+, 2013)
J/ApJS/216/7 : Planets Around Low-Mass Stars (PALMS). IV. (Bowler+, 2015)
J/ApJ/807/45 : Habitable planets orbiting M dwarfs (Dressing+, 2015)
J/A+A/594/A63 : International Deep Planet Survey results (Galicher+, 2016)
J/ApJ/834/85 : Hα emission in nearby M dwarfs (Newton+, 2017)
J/AJ/155/265 : Dolar neighborhood. XLIV. RECONS discoveries (Henry+, 2018)
J/A+A/612/A49 : 324 CARMENES M dwarfs velocities (Reiners+, 2018)
J/A+A/631/A125 : 54 massive companions detected with SOPHIE (Kiefer+, 2019)
J/A+A/625/A68 : Radii and masses of the CARMENES targets (Schweitzer+, 2019)
J/AJ/159/241 : TESS-Keck Survey I HD332231 Radial Velocities (Dalba+, 2020)
J/ApJS/254/42 : Hipparcos-Gaia (EDR3) Catalog Accelerations (Brandt, 2021)
J/A+A/649/A6 : Gaia Catalogue of Nearby Stars (Gaia collaboration, 2021)
J/A+A/645/A7 : Determining true mass of RV exoplanets Gaia (Kiefer+, 2021)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d BJD [2454578/2459602] Barycentric Julian Date
14- 18 F5.1 m/s dRVel [-28.9/43.9] Differential radial velocity (1)
20- 23 F4.1 m/s e_dRVel [3/11] Uncertainty in dRVel
25- 29 A5 --- Inst Instrument; HIRES or HRS
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Note (1): Note that both data sets have arbitrary velocity offsets
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 25-Jan-2023