SIMBAD references

2019MNRAS.487..268J - Mon. Not. R. Astron. Soc., 487, 268-274 (2019/July-3)

Proxima Centauri b is not a transiting exoplanet.

JENKINS J.S., HARRINGTON J., CHALLENER R.C., KURTOVIC N.T., RAMIREZ R., PENA J., McINTYRE K.J., HIMES M.D., RODRIGUEZ E., ANGLADA-ESCUDE G., DREIZLER S., OFIR A., PENA ROJAS P.A., RIBAS I., ROJO P., KIPPING D., BUTLER R.P., AMADO P.J., RODRIGUEZ-LOPEZ C., KEMPTON E.M.-R., PALLE E. and MURGAS F.

Abstract (from CDS):

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 photometric results rule out planetary transits at the 200 ppm level at 4.5 µm, yielding a 3σ upper radius limit of 0.4 R (Earth radii). Previous claims of possible transits from optical ground- and space-based photometry were likely correlated noise in the data from Proxima Centauri's frequent flaring. Our study indicates dramatically reduced stellar activity at near-to-mid infrared wavelengths, compared to the optical. Proxima b is an ideal target for space-based infrared telescopes, if their instruments can be configured to handle Proxima's brightness.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: activity - planetary systems

Simbad objects: 13

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2019.10.23-08:36:13

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