The HARPS search for southern extra-solar planets. XI. Super-Earths (5 and 8 M{⊕}) in a 3-planet system

@article{Udry2007TheHS,
  title={The HARPS search for southern extra-solar planets. XI. Super-Earths (5 and 8 M\{⊕\}) in a 3-planet system},
  author={St{\'e}phane Udry and Xavier Bonfils and Xavier Delfosse and Thierry Forveille and Michel Mayor and Christian Perrier and François Bouchy and Christophe Lovis and Francesco A. Pepe and Didier Queloz and Joseph L. Geneve and Universit'e de Geneve and Switzerland. and Centro de Astronomia e Astrof'isica da Universidade de Lisboa and Portugal and Laboratoire d'astrophysique and Observatoire de Grenoble and Universit'e Joseph Fourier and France. and Institut d'astrophysique de Paris and Service d'A'eronomie du Cnrsipsl and Verrieres-le-Buisson},
  journal={Astronomy and Astrophysics},
  year={2007},
  volume={469}
}
This Letter reports on the detection of two super-Earth planets in the Gl 581 system, which is already known to harbour a hot Neptune. One of the planets has a mass of 5 M⊕ and resides at the “warm” edge of the habitable zone of the star. It is thus the known exoplanet that most resembles our own Earth. The other planet has a 7.7 M⊕ mass and orbits at 0.25 AU from the star, close to the “cold” edge of the habitable zone. These two new light planets around an M3 dwarf further confirm the… Expand

Figures and Tables from this paper

The HARPS search for southern extra-solar planets: XVIII. An Earth-mass planet in the GJ 581 planetary system
The GJ 581 planetary system was already known to harbour three planets, including two presumably rocky planets which straddle its habitable zone. We report here the detection of an additional planetExpand
The HARPS search for southern extra-solar planets - XXXIV. A planetary system around the nearby M dwarf GJ 163, with a super-Earth possibly in the habitable zone
The meter-per-second precision achieved by today velocimeters enables the search for 1 10 M planets in the habitable zone of cool stars. This paper reports on the detection of 3 planets orbiting GJExpand
The HARPS search for southern extra-solar planets - XXXVI. Planetary systems and stellar activity of the M dwarfs GJ 3293, GJ 3341, and GJ 3543
Context. Planetary companions of a fixed mass induce reflex motions with a larger amplitude around lower-mass stars, which adds to making M dwarfs excellent targets for extra-solar planet searches.Expand
The HARPS search for southern extra-solar planets. XIII. A planetary system with 3 Super-Earths (4
Received ; accepted To be inserted later Abstract. This paper reports on the detection of a planetary system with three Super-Earths orbiting HD 40307. HD 40307 is a K2 V metal-deficient star at aExpand
The HARPS search for southern extra-solar planets. XVII. Super-Earth and Neptune-mass planets in m
We report on the detection of two new multiple planet systems orbiting solar-like stars HD 47 186 and HD 181 433. The first system contains a hot Neptune of 22.78 M⊕ with a 4.08-day period and aExpand
Prized results from HARPS - Low-mass/habitable/transiting planets orbiting M dwarfs
Searching for planets around stars with different masses probes the outcome of planetary formation for different initial conditions. The low-mass M dwarfs are also the most frequent stars in ourExpand
The HARPS search for southern extra-solar planets - XIX. Characterization and dynamics of the GJ 876 planetary system
Precise radial-velocity measurements for data acquired with the HARPS spectrograph infer that three planets orbit the M4 dwarf star GJ876. In particular, we confirm the existence of planet d, whichExpand
A ∼5 M SUPER-EARTH ORBITING GJ 436? THE POWER OF NEAR-GRAZING TRANSITS
Most of the presently identified exoplanets have masses similar to that of Jupiter and therefore are assumed to be gaseous objects. With the ever-increasing interest in discovering lower massExpand
The HARPS search for Earth-like planets in the habitable zone - I. Very low-mass planets around HD 20794, HD 85512, and HD 192310
Context. In 2009 we started an intense radial-velocity monitoring of a few nearby, slowly-rotating and quiet solar-type stars within the dedicated HARPS-Upgrade GTO program. Aims. The goal of thisExpand
The M dwarf planet search programme at the ESO VLT + UVES. A search for terrestrial planets in the h
We present radial velocity (RV) measurements of our sample of 40 M dwarfs from our planet search programme with VLT+UVES begun in 2000. Although with our RV precision down to 2–2.5 m/s and timebaseExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 20 REFERENCES
The HARPS search for southern extra-solar planets - VI. A Neptune-mass planet around the nearby M dwarf Gl 581
We report the discovery of a Neptune-mass planet around Gl 581 (M3V, M = 0.31 ), based on precise Doppler measurements with the HARPS spectrograph at La Silla Observatory. The radial velocitiesExpand
The HARPS search for southern extra-solar planets. XVII. Super-Earth and Neptune-mass planets in m
We report on the detection of two new multiple planet systems orbiting solar-like stars HD 47 186 and HD 181 433. The first system contains a hot Neptune of 22.78 M⊕ with a 4.08-day period and aExpand
Discovery of a cool planet of 5.5 Earth masses through gravitational microlensing
TLDR
The detection of a cool, sub-Neptune-mass planets may be more common than gas giant planets, as predicted by the core accretion theory, and is suggested to name OGLE-2005-BLG-390Lb, indicating a planetary mass companion to the lens star of the microlensing event. Expand
A ~7.5 M⊕ Planet Orbiting the Nearby Star, GJ 876*
High-precision, high-cadence radial velocity monitoring over the past 8 yr at the W. M. Keck Observatory reveals evidence for a third planet orbiting the nearby (4.69 pc) dM4 star GJ 876. TheExpand
The Core Accretion Model Predicts Few Jovian-Mass Planets Orbiting Red Dwarfs
The favored theoretical explanation for giant planet formation—in both our solar system and others—is the core accretion model (although it still has some serious difficulties). In this scenario,Expand
Rapid Formation of Super-Earths around M Dwarf Stars
While the recent microlensing discoveries of super-Earths orbiting two M dwarf stars have been taken as support for the core accretion mechanism of giant planet formation, we show here that theseExpand
Toward a Deterministic Model of Planetary Formation. III. Mass Distribution of Short-Period Planets around Stars of Various Masses
The origin of a recently discovered close-in Neptune-mass planet around GJ 436 poses a challenge to the current theories of planet formation. On the basis of the sequential accretion hypothesis andExpand
Toward a Deterministic Model of Planetary Formation. II. The Formation and Retention of Gas Giant Planets around Stars with a Range of Metallicities
The apparent dependence of detection frequency of extrasolar planets on the metallicity of their host stars is investigated with Monte Carlo simulations using a deterministic core-accretion planetExpand
Spectroscopic [Fe/H] for 98 extra-solar planet-host stars. Exploring the probability of planet formation
We present stellar parameters and metallicities, obtained from a detailed spectroscopic analysis, for a large sample of 98 stars known to be orbited by planetary mass companions (almost all knownExpand
M stars as targets for terrestrial exoplanet searches and biosignature detection.
TLDR
It is concluded that attempts at remote sensing of biosignatures and nonbiological markers from M star planets are important, not as tests of any quantitative theories or rational arguments, but instead because they offer an inspection of the residues from a Gyr-long biochemistry experiment in the presence of extreme environmental fluctuations. Expand
...
1
2
...