J/A+A/618/A115 HD 147379 radial velocities (Kaminski+, 2018)
The CARMENES search for exoplanets around M dwarfs.
A Neptune-mass planet traversing the habitable zone around HD 180617.
Kaminski A., Trifonov T., Caballero J.A., Quirrenbach A., Ribas I.,
Reiners A., Amado P.J., Zechmeister M., Dreizler S., Perger M., Tal-Or L.,
Bonfils X., Mayor M., Astudillo-Defru N., Bauer F.F., Bejar V.J.S.,
Cifuentes C., Colome J., Cortes-Contreras M., Delfosse X., Diez-Alonso E.,
Forveille T., Guenther E.W., Hatzes A.P., Henning Th., Jeffers S.V.,
Kuerster M., Lafarga M., Luque R., Mandel H., Montes D., Morales J.C.,
Passegger V.M., Pedraz S., Reffert S., Sadegi S., Schweitzer A., Seifert W.,
Stahl O., Udry S.
<Astron. Astrophys. 618, A115 (2018)>
=2018A&A...618A.115K 2018A&A...618A.115K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities
Keywords: planetary systems - stars: late-type - stars: low-mass -
stars: individual: HD 180617
Abstract:
Despite their activity, low-mass stars are of particular importance
for the search of exoplanets by the means of Doppler spectroscopy, as
planets with lower masses become detectable. We report on the
discovery of a planetary companion around HD 180617, a bright
J=5.58mag, low-mass M=0.45☉ star of spectral type M2.5 V. The
star, located at a distance of 5.9pc, is the primary of the high
proper motion binary system containing vB 10, a star with one of the
lowest masses known in most of the twentieth century. Our analysis is
based on new radial velocity (RV) measurements made at red-optical
wavelengths provided by the high-precision spectrograph CARMENES,
which was designed to carry out a survey for Earth-like planets around
M dwarfs. The available CARMENES data are augmented by archival
Doppler measurements from HIRES and HARPS. Altogether, the RVs span
more than 16 years. The modeling of the RV variations, with a
semi-amplitude of K=2.85-0.25/+0.16m/s yields a Neptune-like planet
with a minimum mass of 12.2-1.4/+1.0M⊕ on a 105.90-0.10/+0.09d
circumprimary orbit, which is partly located in the host star's
habitable zone. The analysis of time series of common activity
indicators does not show any dependence on the detected RV signal. The
discovery of HD 180617 b not only adds information to a currently
hardly filled region of the mass-period diagram of exoplanets around M
dwarfs, but the investigated system becomes the third known binary
consisting of M dwarfs and hosting an exoplanet in an S-type
configuration. Its proximity makes it an attractive candidate for
future studies.
Description:
We analyzed radial velocity data from the CARMENES VIS channel,
HIRES/Keck, and HARPS. All the RVs are corrected for barycentric
motion and secular acceleration.
The CARMENES measurements were taken in the context of the CARMENES
search for exoplanets around M dwarfs. The CARMENES instrument
consists of two channels: the VIS channel obtains spectra at a
resolution of R=94600 in the wavelength range 520-960nm, while the NIR
channel yields spectra of R=80400 covering 960-1710nm. Both channels
are calibrated in wavelength with hollow-cathode lamps and use
temperature- and pressure-stabilized Fabry-Perot etalons to
interpolate the wavelength solution and simultaneously monitor the
spectrograph drift during nightly operations (Bauer et al.,
2015A&A...581A.117B 2015A&A...581A.117B).
Objects:
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RA (2000) DE Designation(s)
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19 16 55.26 +05 10 08.0 HD180617 = GJ 752 A
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 34 420 HD 147379 radial velocities
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See also:
J/A+A/577/A128 : CARMENES input catalog of M dwarfs I (Alonso-Floriano+, 2015)
J/A+A/597/A47 : CARMENES input catalog of M dwarfs II (Cortes-Contreras+ 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d JD Julian date of observation
13- 18 F6.2 m/s RV Radial velocity
20- 23 F4.2 m/s e_RV Radial velocity uncertainty
25- 34 A10 -- Inst Instrument
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Acknowledgements:
Adrian Kaminski, A.Kaminski(at)lsw.uni-heidelberg.de
(End) Adrian Kaminski [LWS, Heidelberg], Patricia Vannier [CDS] 03-Aug-2018