2009A&A...493..645F


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET12:08:38

2009A&A...493..645F - Astronomy and Astrophysics, volume 493, 645-650 (2009/1-2)

The HARPS search for southern extra-solar planets. XIV. Gl 176b, a super-Earth rather than a Neptune, and at a different period.

FORVEILLE T., BONFILS X., DELFOSSE X., GILLON M., UDRY S., BOUCHY F., LOVIS C., MAYOR M., PEPE F., PERRIER C., QUELOZ D., SANTOS N. and BERTAUX J.-L.

Abstract (from CDS):

A 10.24-day Neptune-mass planet was recently announced as orbiting the nearby M2 dwarf Gl 176, based on 28 radial velocities measured with the HRS spectrograph on the Hobby-Heberly Telescope. We obtained 57 radial velocities of Gl 176 with the ESO 3.6m telescope and the HARPS spectrograph, which is known for its sub-m/s stability. The median photon-noise standard error of our measurements is 1.1m/s, significantly lower than the 4.7m/s of the HET velocities, and the 4-year period over which they were obtained overlaps considerably with the epochs of the HET measurements. The HARPS measurements show no evidence of a signal at the period of the putative HET planet, suggesting that its detection was spurious. We do find, on the other hand, strong evidence of a lower mass 8.4MEarth planet, in a quasi-circular orbit and at the different period of 8.78 days. The host star has moderate magnetic activity and rotates on a 39-day period, which we confirm through modulation of both contemporaneous photometry and chromospheric indices. We detect that period, as well, in the radial velocities, but it is well removed from the orbital period and offers no cause for confusion. This new detection of a super-Earth (2MEarth<Msin(i)<10MEarth) around an M dwarf adds to the growing evidence that such planets are common around very low-mass stars. A third of the 20 known planets with Msin(i)<0.1MJup and 3 of the 7 known planets with Msin(i)<10MEarth orbit an M dwarf, in contrast to just 4 of the ∼300 known Jupiter-mass planets.

Abstract Copyright:

Journal keyword(s): stars: planetary systems - stars: late-type - stars: activity - stars: low-mass, brown dwarfs - stars: starspots - stars: individual: Gl 176

VizieR on-line data: <Available at CDS (J/A+A/493/645): table2.dat>

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 285968b Pl 04 42 55.7753203198 +18 57 29.394344631           ~ 35 1
2 HD 285968 PM* 04 42 55.7753203198 +18 57 29.394344631 12.668 11.49 9.951 8.931 7.702 M2.5V 268 2
3 BD-07 4003 BY* 15 19 26.8271336166 -07 43 20.190958776 13.403 11.76 10.560 9.461 8.911 M3V 550 2
4 CD-46 11540 LM* 17 28 39.9455601300 -46 53 42.693246243 12.177 10.973 9.407 8.337 7.006 M3V 216 1

    Equat.    Gal    SGal    Ecl

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2021.03.02-12:08:38

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