Proxima Centauri b is not a transiting exoplanet

@article{Jenkins2019ProximaCB,
  title={Proxima Centauri b is not a transiting exoplanet},
  author={James S. Jenkins and Joseph Harrington and Ryan C. Challener and Nicol{\'a}s T. Kurtovic and R. Ramirez and Jos{\'e} Pe{\~n}a and Kathleen J. McIntyre and Michael D. Himes and E. Rodr'iguez and Guillem Anglada-Escud'e and Stefan Dreizler and Aviv Ofir and Pablo A Pe{\~n}a Rojas and Ignasi Ribas and Patricio M. Rojo and David M. Kipping and R. Paul Butler and Pedro J. Amado and Cristina Rodr'iguez-L'opez and Eliza M.-R. Kempton and Enric Pall{\'e} and Felipe Murgas},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2019}
}
We report Spitzer Space Telescope observations during predicted transits of the exoplanet Proxima Centauri b. As the nearest terrestrial habitable-zone planet we will ever discover, any potential transit of Proxima b would place strong constraints on its radius, bulk density, and atmosphere. Subsequent transmission spectroscopy and secondary-eclipse measurements could then probe the atmospheric chemistry, physical processes, and orbit, including a search for biosignatures. However, our… 

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References

SHOWING 1-10 OF 62 REFERENCES

Searching for the Transit of the Earth-mass Exoplanet Proxima Centauri b in Antarctica: Preliminary Result

Proxima Centauri is known as the closest star to the Sun. Recently, radial velocity (RV) observations revealed the existence of an Earth-mass planet around it. With an orbital period of ∼11 days,

No Conclusive Evidence for Transits of Proxima b in MOST Photometry

The analysis of Proxima Centauri’s radial velocities recently led Anglada-Escudé et al. to claim the presence of a low-mass planet orbiting the Sun’s nearest star once every 11.2 days. Although the a

A Multi-year Search for Transits of Proxima Centauri. I. Light Curves Corresponding to Published Ephemerides

Proxima Centauri has become the subject of intense study since the radial-velocity (RV) discovery by Anglada-Escudé et al. of a planet orbiting this nearby M dwarf every ∼11.2 days. If Proxima

The habitability of Proxima Centauri b. I. Irradiation, rotation and volatile inventory from formation to the present

Proxima b is a planet with a minimum mass of 1.3 MEarth orbiting within the habitable zone (HZ) of Proxima Centauri, a very low-mass, active star and the Sun's closest neighbor. Here we investigate a

TESS Discovery of a Transiting Super-Earth in the pi Mensae System

The detection of a transiting planet around π Men (HD 39091), using data from the Transiting Exoplanet Survey Satellite (TESS), is reported, confirming the existence of the planet and leading to a mass determination of 4.82±0.85 M ⊕.

A super-Earth transiting a nearby low-mass star

Observations of the transiting planet GJ’1214b are reported, finding that the planetary mass and radius are consistent with a composition of primarily water enshrouded by a hydrogen–helium envelope that is only 0.05% of the mass of the planet.

A Candidate Transit Event around Proxima Centauri

We present a single candidate transit event around Proxima Centauri, found during a blind transit search using a robotic 30\,cm telescope at Las Campanas Observatory. The event lasted 1 hour, with an

MOST OBSERVATIONS OF OUR NEAREST NEIGHBOR: FLARES ON PROXIMA CENTAURI

We present a study of white-light flares from the active M5.5 dwarf Proxima Centauri using the Canadian microsatellite Microvariability and Oscillations of STars. Using 37.6 days of monitoring data

Toward detection of terrestrial planets in the habitable zone of our closest neighbor: proxima Centauri

Context. The precision of radial velocity (RV) measurements to detect indirectly planetary companions of nearby stars has improved to enable the discovery of extrasolar planets in the Neptune and

The Carnegie Planet Finder Spectrograph

The Carnegie Planet Finder Spectrograph is being constructed for use at the Magellan Telescopes at Las Campanas Observatory in Chile. Its primary scientific objective is the detection of extrasolar
...