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… 

Figures and Tables from this paper

No Transits of Proxima Centauri Planets in High-Cadence TESS Data

Proxima Centauri is our nearest stellar neighbor and one of the most well-studied stars in the sky. In 2016, a planetary companion was detected through radial velocity measurements. Proxima Centauri

Characterizing the possible interior structures of the nearby Exoplanets Proxima Centauri b and Ross-128 b

We developed a new numerical model to constrain the interior structure of rocky Exoplanets, and applied it to the nearby planets Proxima Centauri b and Ross-128 b. The recently measured elemental

Three-dimensional Climate Simulations for the Detectability of Proxima Centauri b

The discovery of a planet orbiting around Proxima Centauri, the closest star to the Sun, opens new avenues for the remote observations of the atmosphere and surface of an exoplanet, Proxima b. To

An Earth-like Stellar Wind Environment for Proxima Centauri c

A new planet has been recently discovered around Proxima Centauri. With an orbital separation of ∼1.44 au and a minimum mass of about , Proxima c is a prime direct imaging target for atmospheric

A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887

TLDR
Monitoring the nearby red dwarf star GJ 887, Jeffers et al. detected periodic radial velocity signals, indicating the presence of two planets on orbits with periods of about 9 and 22 days and a further candidate planet (see the Perspective by Davies).

Identification and Mitigation of a Vibrational Telescope Systematic with Application to Spitzer

We observed Proxima Centauri with the Spitzer Space Telescope Infrared Array Camera five times in 2016 and 2017 to search for transits of Proxima Centauri b. Following standard analysis procedures,

Estimating Planetary Mass with Deep Learning

While thousands of exoplanets have been confirmed, the known properties about individual discoveries remain sparse and depend on detection technique. To utilize more than a small section of the

Thermal and Orbital Evolution of Low-mass Exoplanets

The thermal, orbital, and rotational dynamics of tidally loaded exoplanets are interconnected by intricate feedback. The rheological structure of the planet determines its susceptibility to tidal

Efficiency of the oxygenic photosynthesis on Earth-like planets in the habitable zone

Oxygenic photosynthesis is the most important biochemical process in Earth biosphere and likely very common on other habitable terrestrial planets, given the general availability of its input

Distinguishing multicellular life on exoplanets by testing Earth as an exoplanet

TLDR
Comparing Earth to other planetary bodies and hypothesizing that Earth's directional reflectance will be between strongly backscattering rocky bodies with no weathering and cloudy bodies with more isotropic scattering suggests that Earth is in line with Mars and Venus, while empirical results put Earth in linewith Venus.

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

TLDR
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 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

Harps-N: the new planet hunter at TNG

The Telescopio Nazionale Galileo (TNG)[9] hosts, starting in April 2012, the visible spectrograph HARPS-N. It is based on the design of its predecessor working at ESO's 3.6m telescope, achieving
...