E. A. Meier Valdés

JWST NIRSpec finds no clear signs of an atmosphere on TOI-1685 b

Chloe Fisher, M. J. Hooton, Amélie Gressier, Merlin Zgraggen et autres

ABSTRACT Determining the prevalence of atmospheres on terrestrial planets is a core objective in exoplanetary science. While M dwarf systems offer a promising opportunity, conclusive observations of terrestrial atmospheres have remained elusive, with many yielding flat transmission spectra. We observe four transits …

gb, us, fr, ch, de, se, au, dk, ca, ie (code pays fourni par la source)

Hot Rocks Survey IV: Emission from LTT 3780 b is consistent with a bare rock

Natalie H. Allen, Néstor Espinoza, Hannah Diamond-Lowe, João M. Mendonça et autres

It is an open question whether small planets around M dwarfs are able to maintain atmospheres. The Hot Rocks Survey aims to address this question by observing 9 rocky exoplanets orbiting M dwarfs with MIRI emission photometry to constrain the onset of …

Hot Rocks Survey

Mark Fortune, Neale P. Gibson, Hannah Diamond-Lowe, João M. Mendonça et autres

Time-series photometry at mid-infrared wavelengths is becoming a common technique to search for atmospheres around rocky exoplanets. This method constrains the brightness temperature of the planet to determine whether heat redistribution is taking place, which would be indicative of the presence of …

Hot Rocks Survey

E. A. Meier Valdés, Brice-Olivier Demory, Hannah Diamond-Lowe, João M. Mendonça et autres

A Disintegrating Rocky World Shrouded in Dust and Gas: Mid-infrared Observations of K2-22 b Using JWST

Nick Tusay, Jason T. Wright, Thomas G. Beatty, Steve Desch et autres

Abstract The disintegrating ultrashort period rocky exoplanet K2-22 b periodically emits dusty clouds in a dynamically chaotic process resulting in a variable transit depth from 0% to 1.3%. The effluents that sublimate off the surface and condense out in space are probably …

Hot Rocks Survey

E. A. Meier Valdés, Brice-Olivier Demory, Hannah Diamond-Lowe, João M. Mendonça et autres

Context . Terrestrial exoplanets orbiting nearby small cool stars, known as M dwarfs, are well suited for an atmospheric characterisation. Because the intense X-ray and UV (XUV) irradiation from M dwarf host stars is strong, orbiting exoplanets are thought to be unable …

Hot Rocks Survey I: A possible shallow eclipse for LHS 1478 b

Prune C. August, L. A. Buchhave, Hannah Diamond-Lowe, João M. Mendonça et autres

Context. M-dwarf systems offer an opportunity to study terrestrial exoplanetary atmospheres due to their small size and cool temperatures. However, the extreme conditions imposed by these host stars raise a question about whether their close-in rocky planets are able to retain any …

dk, us, fr, gb, ie, ch, de, se (code pays fourni par la source)

The CHEOPS view of the climate of WASP-3 b

G. Scandariato, L. Carone, Patricio E. Cubillos, P. F. L. Maxted et autres

Context. Hot Jupiters are giant planets subject to intense stellar radiation. The physical and chemical properties of their atmosphere make them the most amenable targets for atmospheric characterization. Aims. In this paper we analyze the photometry collected during the secondary eclipses of …

The CHEOPS view on the climate of WASP-3 b

G. Scandariato, L. Carone, P. E. Cubillos, P. F. L. Maxted et autres

Hot Jupiters are giant planets subject to intense stellar radiation. The physical and chemical properties of their atmosphere makes them the most amenable targets for the atmospheric characterization. In this paper we analyze the photometry collected during the secondary eclipses of the …

JWST reveals the rapid and strong day-side variability of 55 Cancri e

J. A. Patel, A. Brandeker, Daniel Kitzmann, D. J. M. Petit dit de la Roche et autres

Context . The nature of the close-in rocky planet 55 Cnce is puzzling, despite it having been observed extensively. Its optical and infrared occultation depths show temporal variability, in addition to a phase curve variability observed in the optical. Aims . We …

se, ch, us, gb, de, nl (code pays fourni par la source)

Detection of an Earth-sized exoplanet orbiting the nearby ultracool dwarf star SPECULOOS-3

M. Gillon, P. P. Pedersen, Benjamin V. Rackham, Georgina Dransfield et autres

be, ch, gb, us, fr, es, mx, jp, ru, Maroc, nl, de, cn (code pays fourni par la source)

Sulfur dioxide in the mid-infrared transmission spectrum of WASP-39b

Diana Powell, Adina D. Feinstein, Elspeth K. H. Lee, Michael Zhang et autres

Abstract The recent inference of sulfur dioxide (SO2) in the atmosphere of the hot (approximately 1,100 K), Saturn-mass exoplanet WASP-39b from near-infrared JWST observations1–3 suggests that photochemistry is a key process in high-temperature exoplanet atmospheres4. This is because of the low (<1 …

us, ch, gb, ca, ae, it, es, se, nl, at, fr, de, in, cl (code pays fourni par la source)