J/ApJ/817/L20 Wolf 1061 velocities and planet candidates (Wright+, 2016)
Three planets orbiting Wolf 1061.
Wright D.J., Wittenmyer R.A., Tinney C.G., Bentley J.S., Zhao J.
<Astrophys. J., 817, L20 (2016)>
=2016ApJ...817L..20W 2016ApJ...817L..20W (SIMBAD/NED BibCode)
ADC_Keywords: Radial velocities ; Stars, double and multiple ; Planets
Keywords: methods: data analysis; planets and satellites: detection;
stars: individual: (Wolf 1061, GJ 628); techniques: spectroscopic
Abstract:
We use archival HARPS spectra to detect three planets orbiting the M3
dwarf Wolf 1061 (GJ 628). We detect a 1.36M⊕ minimum-mass
planet with an orbital period P=4.888days (Wolf 1061b), a
4.25M⊕ minimum-mass planet with orbital period P=17.867days
(Wolf 1061c), and a likely 5.21M⊕ minimum-mass planet with
orbital period P=67.274days (Wolf 1061d). All of the planets are of
sufficiently low mass that they may be rocky in nature. The 17.867day
planet falls within the habitable zone for Wolf 1061 and the 67.274day
planet falls just outside the outer boundary of the habitable zone.
There are no signs of activity observed in the bisector spans,
cross-correlation FWHMs, calcium H & K indices, NaD indices, or
Hα indices near the planetary periods. We use custom methods to
generate a cross-correlation template tailored to the star. The
resulting velocities do not suffer the strong annual variation
observed in the HARPS DRS velocities. This differential technique
should deliver better exploitation of the archival HARPS data for the
detection of planets at extremely low amplitudes.
Description:
We have used the 148 publicly available HARPS (High Accuracy Radial
velocity Planet Searcher) spectra of Wolf 1061. The spectra span
380-680nm at resolution ∼110000. The observations were taken over
10.3yrs and typically have 900s exposure times and a median
signal-to-noise ratio (S/N) of 65pixel-1 at 6000Å.
Objects:
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RA (ICRS) DE Designation(s) (Period)
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16 30 18.06 -12 39 45.3 Wolf 1061 = GJ 628
16 30 18.05 -12 39 45.3 Wolf 1061b = Wolf 1061b (P=4.887)
16 30 18.05 -12 39 45.3 Wolf 1061c = Wolf 1061c (P=17.86)
16 30 18.05 -12 39 45.3 Wolf 1061d = Wolf 1061d (P=67.2)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 97 148 Wolf 1061 velocities from this work and HARPS,
cross-correlation FWHM, bisector spans, and
the S-index, Na D and Hα activity indices
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See also:
II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)
J/ApJ/807/45 : Habitable planets cand. around M dwarfs (Dressing+, 2015)
J/A+A/577/A132 : Stellar parameters of early M dwarfs (Maldonado+, 2015)
J/A+A/577/A128 : M dwarfs CARMENES input catalog. I (Alonso-Floriano+, 2015)
J/MNRAS/432/1203 : Rotation periods of M-dwarf stars (McQuillan+, 2013)
J/MNRAS/431/2063 : UV/X-ray activity of M dwarfs within 10pc (Stelzer+, 2013)
J/ApJ/767/95 : Improved parameters of smallest KIC stars (Dressing+, 2013)
J/A+A/551/L8 : Chromospheric activity of field stars (Pace, 2013)
J/A+A/549/A109 : HARPS XXXI. The M-dwarf sample (Bonfils+, 2013)
J/MNRAS/421/3189 : CaII and Hα data for dK5/dM4 stars (Houdebine, 2012)
J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010)
J/ApJ/704/975 : Rotational velocities for M dwarfs (Jenkins+, 2009)
J/ApJ/670/1367 : Gemini Deep Planet Survey (Lafreniere+, 2007)
J/A+A/392/215 : CORALIE survey for extrasolar planets. IX. (Santos+ 2002)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d JD Julian Date
15- 19 F5.2 m/s RVel [-7.4/7.4] Radial velocity from this paper
21- 24 F4.2 m/s e_RVel [0.4/4.2] Error in RVel
26- 30 F5.2 m/s HRVel [-6.8/9] HARPS data reduction software (DRS)
radial velocity
32- 35 F4.2 m/s e_HRVel [0.3/3.4] Error in HRVel
37- 40 I4 m/s FWHM [3394/3436] Full-width-half-maximum of
cross-correlation function (CCF)
42- 43 I2 m/s e_FWHM [19/27] Error in FWHM
45- 49 F5.1 m/s BIS [-11.8/6.1] Bisector of cross-correlation function
51- 53 F3.1 m/s e_BIS [0.9/8] Error in BIS
55- 60 F6.4 --- S [0.01/0.3] S-index value
62- 67 F6.4 --- e_S [0.0007/0.005] Error in S
69- 73 F5.3 --- NaD [4.4/9.6] NaD index value
75- 79 F5.3 --- e_NaD [0.02/0.1] Error in NaD
81- 88 F8.6 --- Ha [0.076/0.089] Hα index value
90- 97 F8.6 --- e_Ha [0/0.0003] Error in Ha
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 20-Apr-2016