2009A&A...493..639M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST20:37:11

2009A&A...493..639M - Astronomy and Astrophysics, volume 493, 639-644 (2009/1-2)

The HARPS search for southern extra-solar planets. XIII. A planetary system with 3 super-Earths (4.2, 6.9, and 9.2 M).

MAYOR M., UDRY S., LOVIS C., PEPE F., QUELOZ D., BENZ W., BERTAUX J.-L., BOUCHY F., MORDASINI C. and SEGRANSAN D.

Abstract (from CDS):

We report the detection of a planetary system with three Super-Earths orbiting HD40307. HD40307 is a K2V metal-deficient star at a distance of only 13 parsec, which is part of the HARPS GTO high-precision planet-search programme. The three planets on circular orbits have very low minimum masses of 4.2, 6.9, and 9.2 Earth masses and periods of 4.3, 9.6, and 20.5 days, respectively. The planet with the shortest period is the lowest mass planet detected to-date orbiting a main sequence star. The detection of the correspondingly low amplitudes of the induced radial-velocity variations is secured completely by the 135 high-quality HARPS observations illustrated by the radial-velocity residuals around the 3-Keplerian solution of only 0.85m/s. Activity and bisector indicators exclude any significant perturbations of stellar intrinsic origin, which supports a planetary interpretation. In contrast to most planet-host stars, HD40307 has a significantly sub-solar metallicity ([Fe/H]=-0.31), which suggests that very light planets might have a different dependence on host star metallicity than gas giant planets. In addition to the 3 planets close to the central star, a small drift in the radial-velocity residuals implies the presence of another companion in the system, the nature of which is still unknown.

Abstract Copyright:

Journal keyword(s): stars: individual: HD40307 - stars: planetary systems - techniques: radial velocities - methods: observational

VizieR on-line data: <Available at CDS (J/A+A/493/639): table1.dat>

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 HD 40307b Pl 05 54 04.2409953924 -60 01 24.491747849           ~ 42 1
2 HD 40307d Pl 05 54 04.2409953924 -60 01 24.491747849           ~ 28 1
3 HD 40307c Pl 05 54 04.2409953924 -60 01 24.491747849           ~ 26 1
4 HD 40307 PM* 05 54 04.2409953924 -60 01 24.491747849 8.814 8.097 7.147 6.597 6.119 K2.5V 192 1
5 HD 69830 PM* 08 18 23.9469692487 -12 37 55.810202572   6.74 5.95     G8:V 452 2
6 Ross 905 PM* 11 42 11.0933874353 +26 42 23.658083337   12.06 10.613 10.272 8.24 M3V 471 1
7 PSR B1257+12 Psr 13 00 03.1075 +12 40 55.155           ~ 463 1
8 BD-07 4003c Pl 15 19 26.8269 -07 43 20.189           ~ 96 1
9 BD-07 4003 BY* 15 19 26.8271336166 -07 43 20.190958776 13.403 11.76 10.560 9.461 8.911 M3V 519 2
10 HD 181433 PM* 19 25 09.5672280149 -66 28 07.676289768   9.42 8.38     K3III-IV 98 1
11 HD 181433b Pl 19 25 09.56785 -66 28 07.6764           ~ 26 1
12 BD-15 6290 BY* 22 53 16.7323107416 -14 15 49.303409936 12.928 11.749 10.192 9.013 7.462 M3.5V 829 1
13 BD-15 6290d Pl 22 53 16.73352 -14 15 49.3186           ~ 134 1

    Equat.    Gal    SGal    Ecl

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2019.10.22-20:37:11

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