Indications for very high metallicity and absence of methane for the eccentric exo-Saturn WASP-117b.
L. Carone,Paul Mollière,Yifan Zhou,Jeroen Bouwman,Fei Yan,Robin Baeyens,Daniel Apai,Néstor Espinoza,Benjamin V. Rackham,Andrés Jordán,Daniel Angerhausen,Leen Decin,Monika Lendl,Olivia Venot,Thomas Henning +14 more
Reads0
Chats0
TLDR
In this paper, a near-infrared transmission spectrum of the exo-Saturn WASP-117b was analyzed with two independent pipelines, and the authors reported the robust detection of a water spectral feature.Abstract:
We investigate the atmospheric composition of the long period ($P_{\rm orb}=$ 10 days), eccentric exo-Saturn WASP-117b. WASP-117b could be in atmospheric temperature and chemistry similar to WASP-107b. In mass and radius WASP-117b is similar to WASP-39b, which allows a comparative study of these planets.
We analyze a near-infrared transmission spectrum of WASP-117b taken with Hubble Space Telescope/WFC3 G141, which was reduced with two independent pipelines. High resolution measurements were taken with VLT/ESPRESSO in the optical. We report the robust ($3\sigma$) detection of a water spectral feature. Using a 1D atmosphere model with isothermal temperature, uniform cloud deck and equilibrium chemistry, the Bayesian evidence of a retrieval analysis of the transmission spectrum indicates a preference for a high atmospheric metallicity ${\rm [Fe/H]}=2.58^{+0.26}_{-0.37}$ and clear skies. The data are also consistent with a lower-metallicity composition ${\rm [Fe/H]}<1.75$ and a cloud deck between $10^{-2.2} - 10^{-5.1}$ bar, but with weaker Bayesian preference. We retrieve a low CH$_4$ abundance of $<10^{-4}$ volume fraction within $1 \sigma$ and $<2\cdot 10^{-1}$ volume fraction within $3 \sigma$. We cannot constrain the equilibrium temperature between theoretically imposed limits of 700 and 1000~K. Further observations are needed to confirm quenching of CH$_4$ with $K_{zz}\geq 10^8$~cm$^2$/s. We report indications of Na and K in the VLT/ESPRESSO high resolution spectrum with substantial Bayesian evidence in combination with HST data.read more
Citations
More filters
batman: BAsic Transit Model cAlculatioN in Python
TL;DR: Batman as discussed by the authors is a Python package for modeling exoplanet transit light curves that uses C extension modules to speed up model calculation and is parallelized with OpenMP, which can calculate one million quadratic limb-darkened models in 30 seconds with a single 1.7 GHz Intel Core i5 processor.
Journal ArticleDOI
Stellar Obliquities in Exoplanetary Systems
TL;DR: A review of the measurement techniques, key findings, and theoretical interpretations related to the obliquities (spin-orbit angles) of planet-hosting stars can be found in this paper .
Journal ArticleDOI
ARES V: No Evidence For Molecular Absorption in the HST WFC3 Spectrum of GJ 1132 b
Lorenzo V. Mugnai,Darius Modirrousta-Galian,Billy Edwards,Quentin Changeat,Jeroen Bouwman,Giuseppe Morello,Giuseppe Morello,Ahmed Al-Refaie,Robin Baeyens,Michelle Fabienne Bieger,Doriann Blain,Amélie Gressier,Gloria Guilluy,Yassin Jaziri,Flavien Kiefer,Mario Morvan,William Pluriel,Mathilde Poveda,Nour Skaf,Niall Whiteford,Sam Wright,Kai Hou Yip,Tiziano Zingales,Benjamin Charnay,Pierre Drossart,Jérémy Leconte,Olivia Venot,Ingo Waldmann,Jean-Philippe Beaulieu,Jean-Philippe Beaulieu +29 more
TL;DR: In this article, a study on the spatially scanned spectroscopic observations of the transit of GJ 1132 b, a warm super-Earth (1.13 R$_\oplus$) that was obtained with the G141 grism (1125 - 1.650 $\mu$m) onboard the Hubble Space Telescope was presented.
Journal ArticleDOI
Transmission spectroscopy for the warm sub-Neptune HD3167c: evidence for molecular absorption and a possible high metallicity atmosphere
Thomas Mikal-Evans,Ian J. M. Crossfield,Björn Benneke,Laura Kreidberg,J. Moses,Caroline V. Morley,Daniel Thorngren,Paul Mollière,Kevin K. Hardegree-Ullman,John M. Brewer,Jessie L. Christiansen,David R. Ciardi,Diana Dragomir,Courtney D. Dressing,Jonathan J. Fortney,Varoujan Gorjian,Thomas P. Greene,Lea A. Hirsch,Andrew W. Howard,Steve B. Howell,Howard Isaacson,Molly R. Kosiarek,Jessica Krick,John H. Livingston,Joshua D. Lothringer,Farisa Y. Morales,Erik A. Petigura,Joshua E. Schlieder,Michael Werner +28 more
TL;DR: In this paper, the authors present a transmission spectrum for the warm (500-600K) sub-Neptune HD3167c obtained using the Hubble Space Telescope Wide Field Camera 3 infrared spectrograph.
Journal ArticleDOI
Grid of pseudo-2D chemistry models for tidally locked exoplanets – I. The role of vertical and horizontal mixing
TL;DR: In this paper, a sequence of post-processed forward models for a large grid of synchronously rotating gaseous exoplanets, where they vary the effective temperature (between 400 and 2600 K), surface gravity, and rotation rate, were applied to analyze the chemistry of exoplanet atmospheres over a large parameter space.
References
More filters
Journal ArticleDOI
Astropy: A community Python package for astronomy
Thomas P. Robitaille,Erik Tollerud,Perry Greenfield,Michael Droettboom,Erik Bray,Tom Aldcroft,Matt Davis,Adam Ginsburg,Adrian M. Price-Whelan,Wolfgang Kerzendorf,A. Conley,Neil H. M. Crighton,Kyle Barbary,Demitri Muna,Henry C. Ferguson,Frédéric Grollier,Madhura Parikh,Prasanth H. Nair,Hans Moritz Günther,Christoph Deil,Julien Woillez,Simon Conseil,Roban Kramer,J. Turner,Leo Singer,R. T. Fox,Benjamin A. Weaver,Victor Zabalza,Zachary I. Edwards,K. Azalee Bostroem,Douglas Burke,Andrew R. Casey,Steven M. Crawford,Nadia Dencheva,Justin Ely,Tim Jenness,Kathleen Labrie,Pey Lian Lim,Francesco Pierfederici,Andrew Pontzen,Andy Ptak,Brian L. Refsdal,Mathieu Servillat,Ole Streicher +43 more
TL;DR: Astropy as discussed by the authors is a Python package for astronomy-related functionality, including support for domain-specific file formats such as flexible image transport system (FITS) files, Virtual Observatory (VO) tables, common ASCII table formats, unit and physical quantity conversions, physical constants specific to astronomy, celestial coordinate and time transformations, world coordinate system (WCS) support, generalized containers for representing gridded as well as tabular data, and a framework for cosmological transformations and conversions.
Journal ArticleDOI
emcee: The MCMC Hammer
TL;DR: The emcee algorithm as mentioned in this paper is a Python implementation of the affine-invariant ensemble sampler for Markov chain Monte Carlo (MCMC) proposed by Goodman & Weare (2010).
Journal ArticleDOI
The Chemical Composition of the Sun
TL;DR: The solar chemical composition is an important ingredient in our understanding of the formation, structure, and evolution of both the Sun and our Solar System as discussed by the authors, and it is an essential refer...
Journal ArticleDOI
Studies in astronomical time series analysis. II - Statistical aspects of spectral analysis of unevenly spaced data
TL;DR: This paper studies the reliability and efficiency of detection with the most commonly used technique, the periodogram, in the case where the observation times are unevenly spaced to retain the simple statistical behavior of the evenly spaced case.
Journal ArticleDOI
emcee: The MCMC Hammer
TL;DR: This document introduces a stable, well tested Python implementation of the affine-invariant ensemble sampler for Markov chain Monte Carlo (MCMC) proposed by Goodman & Weare (2010).
Related Papers (5)
SciPy 1.0: fundamental algorithms for scientific computing in Python.
Pauli Virtanen,Ralf Gommers,Travis E. Oliphant,Matt Haberland,Matt Haberland,Tyler Reddy,David Cournapeau,Evgeni Burovski,Pearu Peterson,Warren Weckesser,Jonathan Bright,Stefan van der Walt,Matthew Brett,Joshua Wilson,K. Jarrod Millman,Nikolay Mayorov,Andrew Nelson,Eric Jones,Robert Kern,Eric B. Larson,CJ Carey,Ilhan Polat,Yu Feng,Eric Moore,Jake Vanderplas,Denis Laxalde,Josef Perktold,Robert Cimrman,Ian Henriksen,Ian Henriksen,E. A. Quintero,Charles R. Harris,Anne M. Archibald,Antônio H. Ribeiro,Fabian Pedregosa,Paul van Mulbregt,SciPy . Contributors +36 more
A continuum from clear to cloudy hot-Jupiter exoplanets without primordial water depletion
David K. Sing,Jonathan J. Fortney,Nikolay Nikolov,Hannah R. Wakeford,Tiffany Kataria,Thomas M. Evans,Suzanne Aigrain,Gilda E. Ballester,Adam Burrows,Drake Deming,Jean-Michel Desert,Neale P. Gibson,Gregory W. Henry,Catherine M. Huitson,Heather Knutson,Alain Lecavelier des Etangs,Frederic Pont,Adam P. Showman,Alfred Vidal-Madjar,Michael H. Williamson,Paul Wilson +20 more