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Giant tidal tails of helium escaping the hot Jupiter HAT-P-32 b
Vanderburg, Andrew; Cochran, William D.; Endl, Michael +14 more
Capturing planets in the act of losing their atmospheres provides rare opportunities to probe their evolution history. This analysis has been enabled by observations of the helium triplet at 10,833 angstrom, but past studies have focused on the narrow time window right around the planet's optical transit. We monitored the hot Jupiter HAT-P-32 b us…
A low-mass planet candidate orbiting Proxima Centauri at a distance of 1.5 AU
Butler, R. Paul; Jenkins, James S.; Anglada-Escudé, Guillem +18 more
Our nearest neighbor, Proxima Centauri, hosts a temperate terrestrial planet. We detected in radial velocities evidence of a possible second planet with minimum mass mc sin ic = 5.8 ± 1.9 M⊕ and orbital period Pc = 5.21+0.26-0.22 years. The analysis of photometric data and spectrosc…
Evidence for a large exomoon orbiting Kepler-1625b
Teachey, Alex; Kipping, David M.
Exomoons are the natural satellites of planets orbiting stars outside our solar system, of which there are currently no confirmed examples. We present new observations of a candidate exomoon associated with Kepler-1625b using the Hubble Space Telescope to validate or refute the moon's presence. We find evidence in favor of the moon hypothesis, bas…