GJ 581 update: Additional evidence for a Super-Earth in the habitable zone

  title={GJ 581 update: Additional evidence for a Super-Earth in the habitable zone},
  author={Steven S. Vogt and R. Paul Butler and Nader Haghighipour},
  journal={Astronomische Nachrichten},
ties We present an analysis of the significantly expanded HARPS 2011 radial velocity data set for GJ 581 that was presented by Forveille et al. (2011). Our analysis reaches substantially different conclusions regarding the evidence for a SuperEarth-mass planet in the star’s Habitable Zone. We were able to reproduce their reported χ 2 and RMS values only after removing some outliers from their models and refitting the trimmed down RV set. A suite of 4000 N-body simulations of their Keplerian… Expand
GJ 581d is a potentially habitable super-Earth in the multiple system of exoplanets orbiting a nearby M dwarf. We investigate this planet's long-term dynamics with an emphasis on its probable finalExpand
The impact of red noise in radial velocity planet searches: only three planets orbiting GJ 581?
We perform a detailed analysis of the latest HARPS and Keck radial velocity data for the planet-hosting red dwarf GJ581, which attracted a lot of attention in recent time. We show that these dataExpand
Dynamical stability of the Gliese 581 exoplanetary system
Using numerical methods we investigate the dynamical stability of the Gliese 581 exoplanetary system. The system is known to harbour four planets (b-e). The existence of another planet (g) in theExpand
An investigation into the radial velocity variability of GJ 581: On the significance of GJ 581g
We investigate the radial velocity variation of GJ 581 based on measurements from the HARPS and Keck HIRES spectrographs. A Fourier pre-whitening procedure is able to extract four planetary signalsExpand
Wobbling Ancient Binaries - Here Be Planets?
In the last few years, a number of planets have been proposed to orbit several post main-sequence binary star systems on the basis of observed variations in the timing of eclipses between the binaryExpand
A DEBRIS disk around the planet hosting M-star GJ 581 spatially resolved with Herschel
Debris disks have been found primarily around intermediate and solar mass stars (spectral types A-K) but rarely around low mass M-type stars. We have spatially resolved a debris disk around theExpand
Exomoon habitability and tidal evolution in low-mass star systems
Discoveries of extrasolar planets in the habitable zone (HZ) of their parent star lead to questions about the habitability of massive moons orbiting planets in the HZ. Around low-mass stars, the HZExpand
Stellar activity masquerading as planets in the habitable zone of the M dwarf Gliese 581
Reexamination of the radial velocity signals from a famous exoplanet system demands demotion of terrestrial candidates, as well as measuring stellar activity using the Hα line, which greatly diminishes the signal of GJ 581d while significantly boosting the signals of the other known super-Earth planets. Expand
Exomoons in the Habitable Zones of M Dwarfs
M dwarfs host most of the exoplanets in the local Milky Way. Some of these planets, ranging from sub-Earths to super-Jupiters, orbit in their stars' habitable zones (HZs), although many likelyExpand
Habitable zone lifetimes of exoplanets around main sequence stars.
The results show that exoplanet HD 85512b is no longer within the HZ, assuming it has an Earth analog atmosphere, and should be considered in future models of planetary habitability as setting an upper limit on the lifetime of any potential exoplanetary biosphere. Expand


Bayesian re-analysis of the radial velocities of Gliese 581. Evidence in favour of only four planetary companions
Aims. The Gliese 581 planetary system has received attention because it has been proposed to host a low-mass planet in its habitable zone. We re-analyse the radial velocity measurements reported toExpand
A new analysis of the GJ581 extrasolar planetary system
We have done a new analysis of the available observations of the GJ581 exoplanetary system. Today this system is controversial due to choices that can be done in the orbital determination. The mainExpand
Radial velocity planets de-aliased. A new, short period for Super-Earth 55 Cnc e
Radial velocity measurements of stellar reflex motion have revealed many extrasolar planets, but gaps in the observations produce aliases, spurious frequencies that are frequently confused with theExpand
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
Aliases of the first eccentric harmonic : Is GJ 581g a genuine planet candidate?
The radial velocity (RV) method for detecting extrasolar planets has been the most successful to date. The RV signal imprinted by a few Earth-mass planet around a cool star is at the limit of theExpand
Stability Analysis of the Planetary System Orbiting υ Andromedae. II. Simulations Using New Lick Observatory Fits
We present results of long-term numerical orbital integrations designed to test the stability of the three-planet system orbiting υ Andromedae and short-term integrations to test whether mutualExpand
The Lick-Carnegie Exoplanet Survey: A 3.1 M ⊕ Planet in the Habitable Zone of the Nearby M3V Star Gliese 581
We present 11 years of HIRES precision radial velocities (RVs) of the nearby M3V star Gliese 581, combining our data set of 122 precision RVs with an existing published 4.3-year set of 119 HARPSExpand
Systemic: A Testbed for Characterizing the Detection of Extrasolar Planets. I. The Systemic Console Package
We present the Systemic Console, a new all-in-one, general-purpose software package for the analysis and combined multiparameter fitting of Doppler radial velocity (RV) and transit timingExpand
The HARPS search for southern extra-solar planets. XI. Super-Earths (5 and 8 M{⊕}) in a 3-planet system
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”Expand
We present new precise HIRES radial velocity (RV) data sets of five nearby stars obtained at Keck Observatory. HD 31253, HD 218566, HD 177830, HD 99492, and HD 74156 are host stars of spectralExpand