Spatially resolved spectroscopy of the exoplanet HR 8799 c

Abstract

HR 8799 is a multi-planet system detected in direct imaging, with three companions known so far. Here, we present spatially resolved VLT/NACO 3.88--4.10 micron spectroscopy of the middle planet, HR 8799 c, which has an estimated mass of ~10 Mjup, temperature of ~1100 K and projected separation of 38 AU. The spectrum shows some differences in the continuum from existing theoretical models, particularly longwards of 4 microns, implying that detailed cloud structure or non-equilibrium conditions may play an important role in the physics of young exoplanetary atmospheres.

4 pages, 4 figures, accepted for publication in ApJ Letters

References in corpus (11)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Optical Images of an Exosolar Planet 25 Light Years from Earth
• Synthetic Spectra and Colors of Young Giant Planet Atmospheres: Effects of Initial Conditions and Atmospheric Metallicity
• Direct Imaging and Spectroscopy of a Planetary Mass Candidate Companion to a Young Solar Analog
• Very high contrast IFU spectroscopy of AB Doradus C: 9 mag contrast at 0.2" without a coronagraph using spectral deconvolution
• A possible architecture of the planetary system HR 8799
• Exoplanet characterization with long slit spectroscopy
• Solar System Analogs Around IRAS-Discovered Debris Disks
• A comprehensive examination of the Eps Eri system -- Verification of a 4 micron narrow-band high-contrast imaging approach for planet searches
• Imaging search for the unseen companion to Eps Ind A -- Improving the detection limits with 4 micron observations
• Integral field spectroscopy of L 449-1 -- A test case for spectral differential imaging with SINFONI

Cited by in corpus (69)

• Images of a fourth planet orbiting HR 8799
• C/O ratio as a Dimension for Characterizing Exoplanetary Atmospheres
• Spectral and Photometric Diagnostics of Giant Planet Formation Scenarios
• Photometric characterization of exoplanets using angular and spectral differential imaging
• A Combined Subaru/VLT/MMT 1--5 Micron Study of Planets Orbiting HR 8799: Implications for Atmospheric Properties, Masses, and Formation
• Near-Infrared Spectroscopy of the Extrasolar Planet HR 8799 b
• Exoplanetary Atmospheres - Chemistry, Formation Conditions, and Habitability
• First light of the VLT planet finder SPHERE. III. New spectrophotometry and astrometry of the HR8799 exoplanetary system
• Orbital characterization of the βPictoris b giant planet
• Model atmospheres for massive gas giants with thick clouds: Application to the HR 8799 planets and predictions for future detections
• The International Deep Planet Survey I. The frequency of wide-orbit massive planets around A-stars
• First Light LBT AO Images of HR 8799 bcde at 1.65 and 3.3 Microns: New Discrepancies between Young Planets and Old Brown Dwarfs
• Review of small-angle coronagraphic techniques in the wake of ground-based second-generation adaptive optics systems
• First light of the VLT planet finder SPHERE. IV. Physical and chemical properties of the planets around HR8799
• Reconnaissance of the HR 8799 Exosolar System I: Near IR Spectroscopy
• M-band Imaging of the HR 8799 Planetary System Using an Innovative LOCI-based Background Subtraction Technique
• Clouds in the Coldest Brown Dwarfs: FIRE Spectroscopy of Ross 458C
• A survey of young, nearby, and dusty stars to understand the formation of wide-orbit giant planets
• High-contrast Imaging Search for Planets and Brown Dwarfs around the Most Massive Stars in the Solar Neighborhood
• Chemical Kinetics on Extrasolar Planets
• The near-infrared spectral energy distribution of β Pictoris b
• The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits: II- Survey description, results and performances
• Reconnaissance of the HR 8799 Exosolar System II: Astrometry and Orbital Motion
• Interpreting the photometry and spectroscopy of directly imaged planets: a new atmospheric model applied to beta Pictoris b and SPHERE observations
• Luminosity of young Jupiters revisited. Massive cores make hot planets
• First Results From VLT NACO Apodizing Phase Plate: 4-micron Images of the Exoplanet beta Pictoris b
• Gemini Planet Imager Spectroscopy of the HR 8799 planets c and d
• Infrared Non-detection of Fomalhaut b -- Implications for the Planet Interpretation
• Thermal Infrared MMTAO Observations of the HR 8799 Planetary System
• Direct Imaging Detection of Methane in the Atmosphere of GJ 504 b
• Spectroscopic characterization of HD 95086 b with the Gemini Planet Imager
• Near-Infrared Multi-Band Photometry of the Substellar Companion GJ 758 B
• Deep Thermal Infrared Imaging of HR 8799 bcde: New Atmospheric Constraints and Limits on a Fifth Planet
• GPI spectra of HR 8799 c, d, and e from 1.5 to 2.4$\mu$m with KLIP Forward Modeling
• A medium-resolution spectrum of the exoplanet HIP 65426 b
• On the Composition of Young, Directly Imaged Giant Planets
• Survival of a planet in short-period Neptunian desert under effect of photo-evaporation
• Could the planets around HR 8799 be brown dwarfs?
• Speckle Suppression with the Project 1640 Integral Field Spectrograph
• A search for a 5th planet around HR 8799 using the star-hopping RDI technique at VLT/SPHERE
• Characterization of the gaseous companion κ Andromedae b: New Keck and LBTI high-contrast observations
• Four-of-a-kind? Comprehensive atmospheric characterisation of the HR 8799 planets with VLTI/GRAVITY
• FIRE Spectroscopy of Five Late-type T Dwarfs Discovered with the Wide-field Infrared Survey Explorer
• New Brown Dwarf Companions to Young Stars in Scorpius-Centaurus
• A Multiplicity Census of Intermediate-Mass Stars in Scorpius-Centaurus
• Direct Imaging Constraints on the Putative Exoplanet 14 Her c
• Searching for young Jupiter analogs around AP Col: L-band high-contrast imaging of the closest pre-main sequence star
• VLT/NACO astrometry of the HR8799 planetary system. L'-band observations of the three outer planets
• The VAST Survey - IV. A wide brown dwarf companion to the A3V star $\zeta$ Delphini
• Astrophotonics: astronomy and modern optics
• The influence of non-isotropic scattering of thermal radiation on spectra of brown dwarfs and hot exoplanets
• Coronagraphic Low Order Wave Front Sensor : post-processing sensitivity enhancer for high performance coronagraphs
• High-contrast spectroscopy of SCR J1845-6357 B
• Simulated performance of the molecular mapping for young giant exoplanets with the Medium Resolution Spectrometer of JWST/MIRI
• Piercing the Glare: Direct Imaging Search for Planets in the Sirius System
• Multi-orbital-phase and multi-band characterization of exoplanetary atmospheres with reflected light spectra
• Direct Imaging of Exoplanets Beyond the Radial Velocity Limit: Application to the HD 134987 System
• Atmospheric characterization of cold exoplanets using a 1.5-m coronagraphic space telescope
• Direct imaging of extra-solar planets in star forming regions: Lessons learned from a false positive around IM Lup
• The compositions of the HR 8799 planets reflect accretion of both solids and metal-enriched gas
• Constraints on the nearby exoplanet $\epsilon$ Ind Ab from deep near/mid-infrared imaging limits
• A Broadband Scalar Vortex Coronagraph
• A New Method for Characterizing Very-Low-Mass Companions with Low Resolution Near-Infrared Spectroscopy
• Mapping the Skies of Ultracool Worlds: Detecting Storms and Spots with Extremely Large Telescopes
• JexoSim 2.0: End-to-End JWST Simulator for Exoplanet Spectroscopy -- Implementation and Case Studies
• Companions of Stars: From Other Stars to Brown Dwarfs to Planets: The Discovery of the First Methane Brown Dwarf
• The mid-infrared spectrum of $\beta$ Pictoris b. First VLTI/MATISSE interferometric observations of an exoplanet
• L-band Integral Field Spectroscopy of the HR 8799 Planetary System
• Direct Imaging of Irregular Satellite Disks in Scattered Light