Detection of transits of the nearby hot Neptune GJ 436 b

@article{Gillon2007DetectionOT,
  title={Detection of transits of the nearby hot Neptune GJ 436 b},
  author={Micha{\"e}l Gillon and Fr'ed'eric Pont and B-O. Demory and F. Mallmann and Michel Mayor and Tsevi Mazeh and Didier Queloz and Avi Shporer and St{\'e}phane Udry and Cern Geneve and Universit'e de Geneve and Switzerland. and Institut d'Astrophysique et de G'eophysique and Universit'e de Liege and Belgium and Observatoire Francois-Xavier Bagnoud - Ofxb and School of Cosmic Physics and Astronomy and Raymond and Beverly Sackler Faculty of Exact Sciences and Tel Aviv University and Tel Aviv and Israel and Laboratoire d'astrophysique and Ecole polytechnique f'ed'erale de Lausanne and Observatoire},
  journal={Astronomy \& Astrophysics},
  year={2007},
  volume={472},
  pages={L13-L16}
}
This Letter reports on the photometric detection of transits of the Neptune-mass planet orbiting the nearby M-dwarf star GJ 436. It is by far the closest, smallest, and least massive transiting planet detected so far. Its mass is slightly larger than Neptune’s at M = 22.6 ± 1.9 M⊕. The shape and depth of the transit lightcurves show that it is crossing the host star disc near its limb (impact parameter 0.84 ± 0.03) and that the planet size is comparable to that of Uranus and Neptune, R = 25 200… 

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References

SHOWING 1-10 OF 20 REFERENCES

A Neptune-Mass Planet Orbiting the Nearby M Dwarf GJ 436

We report precise Doppler measurements of GJ 436 (M2.5 V) obtained at Keck Observatory. The velocities reveal a planetary companion with orbital period of 2.644 days, eccentricity of 0.12 (consistent

HD 147506b: A Supermassive Planet in an Eccentric Orbit Transiting a Bright Star

We report the discovery of a massive (Mp = 9.04 ± 0.50 MJ) planet transiting the bright (V = 8.7) F8 star HD 147506, with an orbital period of 5.63341 ± 0.00013 days and an eccentricity of e = 0.520

The M Dwarf GJ 436 and its Neptune‐Mass Planet

We determine stellar parameters for the M dwarf GJ 436, which hosts a Neptune‐mass planet. We employ primarily spectral modeling at low and high resolution, examining the agreement between model and

Detection of an Extrasolar Planet Atmosphere

We report high-precision spectrophotometric observations of four planetary transits of HD 209458, in the region of the sodium resonance doublet at 589.3 nm. We find that the photometric dimming

The effect of red noise on planetary transit detection

Since the discovery of short-period exoplanets a decade ago, photometric surveys have been recognized as a feasible method to detect transiting hot Jupiters. Many transit surveys are now underway,

A Spitzer Spectrum of the Exoplanet HD 189733b

We report on the measurement of the 7.5-14.7 μm spectrum for the transiting extrasolar giant planet HD 189733b using the Infrared Spectrograph on the Spitzer Space Telescope. Although the

Planetary Radii across Five Orders of Magnitude in Mass and Stellar Insolation: Application to Transits

To aid in the physical interpretation of planetary radii constrained through observations of transiting planets, or eventually direct detections, we compute model radii of pure hydrogen-helium,

LIMITS TO CCD ENSEMBLE PHOTOMETRY PRECISION, AND PROSPECTS FOR ASTEROSEISMOLOGY

We report results of CCD ensemble, time-resolved photometry with the KPNO 2.1-m telescope yielding precision of 400 umag per minute of integration. Previous experience on 1-m class telescopes and

Masses and Radii of Low-Mass Stars: Theory Versus Observations

Eclipsing binaries with M-type components are still rare objects. Strong observational biases have made that today only a few eclipsing binaries with component masses below 0.6 M⊙ and well-determined

The angular sizes of dwarf stars and subgiants Surface brightness relations calibrated by interferometry

The availability of a number of new interferometric measurements of Main Sequence and subgiant stars makes it possible to calibrate the surface brightness relations of these stars using exclusively