A Spitzer Search for Water in the Transiting Exoplanet HD189733b
arXiv:0709.0576 · doi:10.1086/522792
Abstract
We present Spitzer Space Telescope observations of the extrasolar planet HD189733b primary transit, obtained simultaneously at 3.6 and 5.8 microns with the Infrared Array Camera. The system parameters, including planetary radius, stellar radius, and impact parameter are derived from fits to the transit light curves at both wavelengths. We measure two consistent planet-to-star radius ratios, (Rp/Rs)[3.6m] = 0.1560 +/- 0.0008(stat) +/- 0.0002(syst) and (Rp/Rs)[5.8m] = 0.1541 +/- 0.0009(stat) +/- 0.0009(syst), which include both the random and systematic errors in the transit baseline. Although planet radii are determined at 1%-accuracy, if all uncertainties are taken into account the resulting error bars are still too large to allow for the detection of atmospheric constituants like water vapour. This illustrates the need to observe multiple transits with the longest possible out-of-transit baseline, in order to achieve the precision required by transmission spectroscopy of giant extrasolar planets.
arXiv commentAccepted in The Astrophysical Journal Letters
References in corpus (19)
- The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
- Analytic Lightcurves for Planetary Transit Searches
- Detection of an Extrasolar Planet Atmosphere
- A map of the day-night contrast of the extrasolar planet HD 189733b
- Detection of oxygen and carbon in the hydrodynamically escaping atmosphere of the extrasolar planet HD209458b
- ELODIE metallicity-biased search for transiting Hot Jupiters II. A very hot Jupiter transiting the bright K star HD189733
- Transmission Spectra as Diagnostics of Extrasolar Giant Planet Atmospheres
- Detection of transits of the nearby hot Neptune GJ 436 b
- Using Stellar Limb-Darkening to Refine the Properties of HD 209458b
- Hubble Space Telescope times-series photometry of the planetary transit of HD189733: no moon, no rings, starspots
- The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733
- Identification of Absorption Features in an Extrasolar Planet Atmosphere
- Accurate Spitzer infrared radius measurement for the hot Neptune GJ 436b
- A Sensitive Search for Variability in Late L Dwarfs: The Quest for Weather
- Infrared Transmission Spectra for Extrasolar Giant Planets
- Analysis of Spitzer Spectra of Irradiated Planets: Evidence for Water Vapor?
- Refined parameters of the planet orbiting HD 189733
- A posteriori detection of the planetary transit of HD189733b in the Hipparcos photometry
- A Spitzer Infrared Radius for the Transiting Extrasolar Planet HD209458b
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- Improved parameters for extrasolar transiting planets
- Detection of atmospheric haze on an extrasolar planet: The 0.55 - 1.05 micron transmission spectrum of HD189733b with the Hubble Space Telescope
- Disequilibrium Carbon, Oxygen, and Nitrogen Chemistry in the Atmospheres of HD 189733b and HD 209458b
- The prevalence of dust on the exoplanet HD 189733b from Hubble and Spitzer observations
- Rayleigh scattering in the transit spectrum of HD 189733b
- Detection of water absorption in the day side atmosphere of HD 189733 b using ground-based high-resolution spectroscopy at 3.2 microns
- Transits of Earth-Like Planets
- Transmission Spectra of Three-Dimensional Hot Jupiter Model Atmospheres
- Strong Water Absorption in the Dayside Emission Spectrum of the Planet HD 189733b
- Theoretical Spectra and Light Curves of Close-in Extrasolar Giant Planets and Comparison with Data
- Ground-based detection of sodium in the transmission spectrum of exoplanet HD209458b
- H2O and OH gas in the terrestrial planet-forming zones of protoplanetary disks
- Search for Carbon Monoxide in the atmosphere of the Transiting Exoplanet HD189733b
- Atmospheric Circulation of Hot Jupiters: A Shallow Three-Dimensional Model
- A new look at NICMOS transmission spectroscopy of HD189733, GJ-436 and XO-1: no conclusive evidence for molecular features
- Three Dimensional Radiative Hydrodynamical Simulations of the Highly Irradiated Short Period Exoplanet HD189733b
- Atmospheric escape from HD 189733b observed in HI Lyman-alpha: detailed analysis of HST/STIS September 2011 observations
- Impact of occultations of stellar active regions on transmission spectra: Can occultation of a plage mimic the signature of a blue sky?
- Instrumentation for the detection and characterization of exoplanets
- A Detection Of H-alpha In An Exoplanetary Exosphere
- Observation of the full 12-hour-long transit of the exoplanet HD80606b. Warm-Spitzer photometry and SOPHIE spectroscopy
- Water in HD 209458b's atmosphere from 3.6 - 8 microns IRAC photometric observations in primary transit
- Features in the Broadband Eclipse Spectra of Exoplanets: Signal or Noise?
- A Survey of Alkali Line Absorption in Exoplanetary Atmospheres
- Multiwavelength flux variations induced by stellar magnetic activity: effects on planetary transits
- The Earth as an extrasolar transiting planet: Earth's atmospheric composition and thickness revealed by Lunar eclipse observations
- Transiting Exoplanets with JWST
- Looking for the rainbow on exoplanets covered by liquid and icy water clouds
- Potassium detection in the clear atmosphere of a hot-Jupiter: FORS2 transmission spectroscopy of WASP-17b
- Transit spectrophotometry of the exoplanet HD189733b. II. New Spitzer observations at 3.6 microns
- The GTC exoplanet transit spectroscopy survey. IV. Confirmation of the flat transmission spectrum of HAT-P-32b
- A new look at Spitzer primary transit observations of the exoplanet HD189733b
- A New Concept for Spectro-photometry of Exoplanets with Space-based Telescopes
- Rotational quenching of rotationally-excited HO in collisions with He
- Defocussed Transmission Spectroscopy: A potential detection of sodium in the atmosphere of WASP-12b
- Probing the atmosphere of a sub-Jovian planet orbiting a cool dwarf
- Search for rings and satellites around the exoplanet CoRoT-9b using Spitzer photometry
- Evaluating Climate Variability Of The Canonical Hot Jupiters Hd 189733b & Hd 209458b Through Multi-epoch Eclipse Observations
- A blind method to detrend instrumental systematics in exoplanetary light-curves
- Detection and Characterization of Extrasolar Planets through Doppler Spectroscopy
- Is Beta Pic b the transiting planet of November 1981?
- Fe I in the β Pictoris circumstellar gas disk I. Physical properties of the neutral iron gas
- Emergent Exoplanet Flux: Review of the Spitzer Results
- The when and where of water in the history of the universe
- Thermosphere and exosphere of Hot-Jupiters