J/A+A/602/A88 5 M dwarfs radial velocity curves (Astudillo-Defru+, 2017)
The HARPS search for southern extra-solar planets ?
XLI. A dozen planets around the M dwarfs GJ 3138, GJ 3323, GJ 273, GJ 628, and
GJ 3293.
Astudillo-Defru N., Forveille T., Bonfils X., Segransan D., Bouchy F.,
Delfosse X., Lovis C., Mayor M., Murgas F., Pepe F., Santos N.C., Udry S.,
Wunsche A.
<Astron. Astrophys. 602, A88 (2017)>
=2017A&A...602A..88A 2017A&A...602A..88A (SIMBAD/NED BibCode)
ADC_Keywords: Stars, M-type ; Stars, double and multiple ; Planets ;
Radial velocities
Keywords: stars: individual: GJ 3138, GJ 3323, GJ 273, GJ 628, GJ 3293 -
stars: planetary systems - stars: late-type -
planets and satellites: detection - technique: radial velocities
Abstract:
Low mass stars are currently the best targets for searches for rocky
planets in the habitable zone of their host star. Over the last 13
years, precise radial velocities measured with the HARPS spectrograph
have identified over a dozen super-Earths and Earth-mass planets
(msini≤10M☉) around M dwarfs, with a well understood selection
function. This well defined sample informs on their frequency of
occurrence and on the distribution of their orbital parameters, and
therefore already constrains our understanding of planetary formation.
The subset of these low-mass planets that were found within the
habitable zone of their host star also provide prized targets for
future atmospheric biomarkers searches.
We are working to extend this planetary sample to lower masses and
longer periods through dense and long-term monitoring of the radial
velocity of a small M dwarf sample.
We obtained large numbers of HARPS spectra for the M dwarfs GJ 3138,
GJ 3323, GJ 273, GJ 628 and GJ 3293, from which we derived radial
velocities (RVs) and spectroscopic activity indicators. We searched
them for variabilities, periodicities, Keplerian modulations and
correlations, and attribute the radial-velocity variations to
combinations of planetary companions and stellar activity.
We detect 12 planets, of which 9 are new with masses ranging from 1.17
to 10.5M☉. Those planets have relatively short orbital periods
(P<40d), except two of them with periods of 217.6 and 257.8 days.
Among these systems, GJ 273 harbor two planets with masses close to
the one of the Earth. With a distance of 3.8 parsec only, GJ 273 is
the second nearest known planetary system - after Proxima Centauri -
with a planet orbiting the circumstellar habitable zone.
Description:
We obtained spectra of the five targets with HARPS, a cross-dispersed
echelle spectrograph fibre-fed by the 3.6m telescope at ESO/La Silla
Observatory (Chile).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 58 5 List of studied stars
tablea1.dat 74 199 Radial velocities time series for GJ 3138
tablea2.dat 74 154 Radial velocities time series for GJ 3323
tablea3.dat 74 280 Radial velocities time series for GJ 273
tablea4.dat 74 187 Radial velocities time series for GJ 628
tablea5.dat 74 207 Radial velocities time series for GJ 3293
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See also:
J/A+A/600/A13 : HARPS M dwarf sample magnetic activity (Astudillo-Defru+, 2017)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Name Star name
11- 12 I2 h RAh Right ascension (J2000)
14- 15 I2 min RAm Right ascension (J2000)
17- 21 F5.2 s RAs Right ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
27- 28 I2 arcmin DEm Declination (J2000)
30- 33 F4.1 arcsec DEs Declination (J2000)
35- 38 A4 --- SpType Spectral type from Hawley et al.
(1996AJ....112.2799H 1996AJ....112.2799H, Cat. III/198)
40- 41 I2 d Prot ?=- Rotational period From Astudillo-Defru et
al. (2017, Cat. J/A+A/600/A13), where the
typical error is 8.7%
43- 46 F4.1 d Prot2 ?=- Rotational period (this work), from the
periodogram of activity indices
48- 58 A11 --- FileName Name of the table with radial velocity data
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Byte-by-byte Description of file: tablea[12345].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- 22 F9.5 km/s RV Radial velocity (1)
24- 30 F7.5 km/s sigma Radial velocity dispersion
32- 38 F7.5 km/s FWHM FWHM of the cross-correlation function
40- 47 F8.5 --- Contrast Contrast of the cross-correlation function
49- 57 F9.5 km/s BIS ?=99 Bisector span of the cross-correlation
function
59- 66 F8.5 --- S-index ?=99 S-index
68- 74 F7.5 --- Ha ?=9 Hα index
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Note (1): not corrected for activity (Eq. 2).
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History:
From electronic version
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(End) Patricia Vannier [CDS] 19-Jun-2017