Hydrogen gas evaporating from the atmosphere of the hot-Neptune GJ436b absorbs over 50% of the stellar Lya emission during transit. Given the planet's atmospheric composition and energy-limited escape rate, this hydrogen outflow is expected to entrain heavier atoms such as C and O. We searched for C and Si in the escaping atmosphere of GJ436b using far-ultraviolet Hubble Space Telescope COS G130M observations made during the planet's extended H I transit. These observations show no transit absorption in the C II 1334,1335 angstrom and Si III 1206 angstrom lines integrated over [-100, 100] km s(-1), imposing 95% (2 sigma) upper limits of 14% (C II) and 60% (Si III) depth on the transit of an opaque disk and 22% (C II) and 49% (Si III) depth ...
International audienceThe M dwarf GJ 436 hosts a transiting warm Neptune known to experience atmosph...
International audienceExoplanets orbiting close to their parent stars may lose some fraction of thei...
Context. The quiet M2.5 star GJ 436 hosts a warm Neptune that displays an extended atmosphere that d...
Context. π Men c is the first planet to have been discovered by the Transiting Exoplanet Survey Sate...
International audienceTransit observations in the Lyman-α line of the hot-Jupiters HD 209458b and HD...
International audienceContext. The quiet M2.5 star GJ 436 hosts a warm Neptune that displays an exte...
One of the most well-studied exoplanets to date, HD 189733 b, stands out as an archetypal hot Jupite...
K2-18 b is a transiting mini-Neptune that orbits a nearby (38 pc), cool M3 dwarf and is located insi...
The heating by photoionization in the thermosphere of short-period exoplanets can drive hydrodynamic...
International audienceThe M dwarf GJ 436 hosts a transiting warm Neptune known to experience atmosph...
International audienceExoplanets orbiting close to their parent stars may lose some fraction of thei...
Context. The quiet M2.5 star GJ 436 hosts a warm Neptune that displays an extended atmosphere that d...
Context. π Men c is the first planet to have been discovered by the Transiting Exoplanet Survey Sate...
International audienceTransit observations in the Lyman-α line of the hot-Jupiters HD 209458b and HD...
International audienceContext. The quiet M2.5 star GJ 436 hosts a warm Neptune that displays an exte...
One of the most well-studied exoplanets to date, HD 189733 b, stands out as an archetypal hot Jupite...
K2-18 b is a transiting mini-Neptune that orbits a nearby (38 pc), cool M3 dwarf and is located insi...
The heating by photoionization in the thermosphere of short-period exoplanets can drive hydrodynamic...
International audienceThe M dwarf GJ 436 hosts a transiting warm Neptune known to experience atmosph...
International audienceExoplanets orbiting close to their parent stars may lose some fraction of thei...
Context. The quiet M2.5 star GJ 436 hosts a warm Neptune that displays an extended atmosphere that d...