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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 (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:
FileName Lrecl Records Explanations
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
See also: J/A+A/600/A13 : HARPS M dwarf sample magnetic activity (Astudillo-Defru+, 2017) Byte-by-byte Description of file: list.dat
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, 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
Byte-by-byte Description of file: tablea[12345].dat
Bytes Format Units Label Explanations
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
Note (1): not corrected for activity (Eq. 2).
History: From electronic version References: Pepe et al., Paper I 2004A&A...423..385P Santos et al., Paper II 2004A&A...426L..19S Lovis et al., Paper III 2005A&A...437.1121L Moutou et al., Paper IV 2005A&A...439..367M Udry et al., Paper V 2006A&A...447..361U Bonfils et al., Paper VI 2005A&A...443L..15B Lo Curto et al., Paper VII 2006A&A...451..345L Pepe et al., Paper VIII 2007A&A...462..769P Naef et al., Paper IX 2007A&A...470..721N Bonfils et al., Paper X 2007A&A...474..293B, Cat. J/A+A/474/293 Udry et al., Paper XI 2007A&A...469L..43U, Cat. J/A+A/469/L43 Santos et al., Paper XII 2007A&A...474..647S Mayor et al., Paper XIII 2009A&A...493..639M, Cat. J/A+A/493/639 Forveille et al., Paper XIV 2009A&A...493..645F, Cat. J/A+A/493/645 Moutou et al., Paper XV 2009A&A...496..513M, Cat. J/A+A/496/513 Correia et al., Paper XVI 2009A&A...496..521C, Cat. J/A+A/496/521 Bouchy et al., Paper XVII 2009A&A...496..527B, Cat. J/A+A/496/527 Mayor et al., Paper XVIII 2009A&A...507..487M, Cat. J/A+A/507/487 Correia et al., Paper XIX 2010A&A...511A..21C, Cat. J/A+A/511/A21 Hebrard et al., Paper XX 2010A&A...512A..46H, Cat. J/A+A/512/A46 Santos et al., Paper XXI 2010A&A...512A..47S, Cat. J/A+A/512/A47 Lo Curto et al., Paper XXII 2010A&A...512A..48L, Cat. J/A+A/512/A48 Naef et al., Paper XXIII 2010A&A...523A..15N, Cat. J/A+A/523/A15 Mordasini et al., Paper XXIV 2011A&A...526A.111M, Cat. J/A+A/526/A111 Santos et al., Paper XXV 2011A&A...526A.112S, Cat. J/A+A/526/A112 Forveille et al., Paper XXVI 2011A&A...526A.141F, Cat. J/A+A/526/A141 Moutou et al., Paper XXVII 2011A&A...527A..63M, Cat. J/A+A/527/A63 Lovis et al., Paper XXVIII 2011A&A...528A.112L, Cat. J/A+A/528/A112 Segransan et al., Paper XXIX 2011A&A...535A..54S Dumusque et al., Paper XXX 2011A&A...535A..55D, Cat. J/A+A/535/A55 Bonfils et al., Paper XXXI 2013A&A...549A.109B Lo Curto et al., Paper XXXII 2013A&A...551A..59L, Cat. J/A+A/551/A59 Delfosse et al., Paper XXXIII 2013A&A...553A...8D Bonfils et al., Paper XXXIV 2013A&A...556A.110B, Cat. J/A+A/556/A110 Santos et al., Paper XXXV 2014A&A...566A..35S, Cat. J/A+A/566/A35 Astudillo-Defru et al., Paper XXXVI 2015A&A...575A.119A, Cat. J/A+A/575/A119 Moutou et al., Paper XXXVII 2015A&A...576A..48M, Cat. J/A+A/576/A48 Diaz et al., Paper XXXVIII 2016A&A...585A.134D, Cat. J/A+A/585/A134 Mortier et al., Paper XXXIX 2016A&A...585A.135M, Cat. J/A+A/585/A135 Faria et al., Paper XL 2016A&A...589A..25F
(End) Patricia Vannier [CDS] 19-Jun-2017
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