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Peering into the Young Planetary System AB Pic. Atmosphere, Orbit, Obliquity & Second Planetary Candidate
P. Palma-Bifani, G. Chauvin, M. Bonnefoy +24
We aim to revisit the system AB Pic which has a known companion at the exoplanet/ brown-dwarf boundary. We based this study on a rich set of observations to investigate the compani…
A dayside thermal inversion in the atmosphere of WASP-19b
A. S. Rajpurohit, F. Allard, D. Homeier +2
Observations of ultra-hot Jupiters indicate the existence of thermal inversion in their atmospheres with day-side temperatures greater than 2200 K. Various physical mechanisms such…
The GJ 504 system revisited. Combining interferometric, radial velocity, and high contrast imaging data
M. Bonnefoy, K. Perraut, A. -M. Lagrange +79
The G-type star GJ504A is known to host a 3 to 35 MJup companion whose temperature, mass, and projected separation all contribute to make it a test case for the planet formation th…
Spectral and atmospheric characterization of 51 Eridani b using VLT/SPHERE
M. Samland, P. Mollière, M. Bonnefoy +37
51 Eridani b is an exoplanet around a young (20 Myr) nearby (29.4 pc) F0-type star, recently discovered by direct imaging. Being only 0.5" away from its host star it is well suited…
High-precision stellar limb-darkening in exoplanetary transits
Giuseppe Morello, Angelos Tsiaras, Ian D. Howarth +1
Characterization of the atmospheres of transiting exoplanets relies on accurate measurements of the extent of the optically thick area of the planet at multiple wavelengths with a…
The UK Met Office GCM with a sophisticated radiation scheme applied to the hot Jupiter HD 209458b
David S. Amundsen, Nathan J. Mayne, Isabelle Baraffe +6
To study the complexity of hot Jupiter atmospheres revealed by observations of increasing quality, we have adapted the UK Met Office global circulation model (GCM), the Unified Mod…
Variability in a Young, L/T Transition Planetary-Mass Object
Beth A. Biller, Johanna Vos, Mariangela Bonavita +15
As part of our ongoing NTT SoFI survey for variability in young free-floating planets and low mass brown dwarfs, we detect significant variability in the young, free-floating plane…
High-contrast imaging of Sirius~A with VLT/SPHERE: Looking for giant planets down to one astronomical unit
A. Vigan, C. Gry, G. Salter +4
Sirius has always attracted a lot of scientific interest, especially after the discovery of a companion white dwarf at the end of the 19th century. Very early on, the existence of…
A Precise Water Abundance Measurement for the Hot Jupiter WASP-43b
Laura Kreidberg, Jacob L. Bean, Jean-Michel Désert +13
The water abundance in a planetary atmosphere provides a key constraint on the planet's primordial origins because water ice is expected to play an important role in the core accre…
Thermal structure of an exoplanet atmosphere from phase-resolved emission spectroscopy
Kevin B. Stevenson, Jean-Michel Desert, Michael R. Line +13
Exoplanets that orbit close to their host stars are much more highly irradiated than their Solar System counterparts. Understanding the thermal structures and appearances of these…
Physical and orbital properties of Beta Pictoris b
M. Bonnefoy, G. -D. Marleau, R. Galicher +13
The intermediate-mass star Beta Pictoris is known to be surrounded by a structured edge-on debris disk within which a gas giant planet was discovered orbiting at 8-10 AU. The physi…
Discovery of a wide planetary-mass companion to the young M3 star GU Psc
Marie-Eve Naud, Étienne Artigau, Lison Malo +11
We present the discovery of a co-moving planetary-mass companion ~42" (~2000 AU) from a young M3 star, GU Psc, likely member of the young AB Doradus Moving Group (ABDMG). The compa…
Hubble Space Telescope Near-IR Transmission Spectroscopy of the Super-Earth HD 97658b
Heather A. Knutson, Diana Dragomir, Laura Kreidberg +7
Recent results from the Kepler mission indicate that super-Earths (planets with masses between 1-10 times that of the Earth) are the most common kind of planet around nearby Sun-li…
A global cloud map of the nearest known brown dwarf
I. J. M. Crossfield, B. Biller, J. E. Schlieder +9
Brown dwarfs -- substellar bodies more massive than planets but not massive enough to initiate the sustained hydrogen fusion that powers self-luminous stars -- are born hot and slo…
A featureless transmission spectrum for the Neptune-mass exoplanet GJ 436b
Heather A. Knutson, Björn Benneke, Drake Deming +1
GJ 436b is a warm-- approximately 800 K--extrasolar planet that periodically eclipses its low-mass (half the mass of the Sun) host star, and is one of the few Neptune-mass planets…
Clouds in the atmosphere of the super-Earth exoplanet GJ 1214b
Laura Kreidberg, Jacob L. Bean, Jean-Michel Désert +7
Recent surveys have revealed that planets intermediate in size between Earth and Neptune ("super-Earths") are among the most common planets in the Galaxy. Atmospheric studies are t…
Transmission Spectroscopy of the Hot-Jupiter WASP-12b from 0.7 to 5 microns
Kevin B. Stevenson, Jacob L. Bean, Andreas Seifahrt +5
Since the first report of a potentially non-solar carbon-to-oxygen ratio (C/O) in its dayside atmosphere, the highly irradiated exoplanet WASP-12b has been under intense scrutiny a…
Ground-Based Transit Spectroscopy of the Hot-Jupiter WASP-19b in the Near-Infrared
Jacob L. Bean, Jean-Michel Désert, Andreas Seifahrt +4
We present ground-based measurements of the transmission and emission spectra of the hot-Jupiter WASP-19b in nine spectroscopic channels from 1.25 to 2.35 microns. The measurements…
The near-infrared spectral energy distribution of β Pictoris b
M. Bonnefoy, A. Boccaletti, A. -M. Lagrange +9
A gas giant planet has previously been directly seen orbiting at 8-10 AU within the debris disk of the ~12 Myr old star β Pictoris. The β Pictoris system offers the rare opportunit…
The Flat Transmission Spectrum of the Super-Earth GJ1214b from Wide Field Camera 3 on the Hubble Space Telescope
Zachory K. Berta, David Charbonneau, Jean-Michel Désert +7
Capitalizing on the observational advantage offered by its tiny M dwarf host, we present HST/WFC3 grism measurements of the transmission spectrum of the super-Earth exoplanet GJ121…
The Optical and Near-Infrared Transmission Spectrum of the Super-Earth GJ1214b: Further Evidence for a Metal-Rich Atmosphere
Jacob L. Bean, Jean-Michel Désert, Petr Kabath +7
We present an investigation of the transmission spectrum of the 6.5 M_earth planet GJ1214b based on new ground-based observations of transits of the planet in the optical and near-…
A Spitzer Transmission Spectrum for the Exoplanet GJ 436b, Evidence for Stellar Variability, and Constraints on Dayside Flux Variations
Heather A. Knutson, Nikku Madhusudhan, Nicolas B. Cowan +10
In this paper we describe a uniform analysis of eight transits and eleven secondary eclipses of the extrasolar planet GJ 436b obtained in the 3.6, 4.5, and 8.0 micron bands using t…
A ground-based transmission spectrum of the super-Earth exoplanet GJ1214b
Jacob L. Bean, Eliza Miller-Ricci Kempton, Derek Homeier
In contrast to planets with masses similar to that of Jupiter and higher, the bulk compositions of planets in the so-called super-Earth regime cannot be uniquely determined from a…
On the possibility of detecting extrasolar planets' atmospheres with the Rossiter-McLaughlin-effect
S. Dreizler, A. Reiners, D. Homeier +1
The detection of extrasolar planets' atmospheres requires very demanding observations. For planets that can not be spatially separated from their host stars, i.e. the vast majority…