Now showing items 1-20 of 20

  • Atmospheric escape from HD 189733b observed in H i Lyman-α: Detailed analysis of HST/STIS September 2011 observations 

    Bourrier, V.; Lecavelier des Etangs, A.; Dupuy, H.; Ehrenreich, D.; Vidal-Madjar, A.; Hebrard, G.; Ballester, G.; Desert, J.-M.; Ferlet, R.; Sing, David K.; Wheatley, P.J. (EDP Sciences for European Southern Observatory (ESO), 2013)
    Observations of transits of the hot giant exoplanet HD 189733b in the unresolved H i Lyman-α line show signs of hydrogen escaping the upper atmosphere of the planet. New resolved Lyman-α observations obtained with the STIS ...
  • Determining atmospheric conditions at the terminator of the hot Jupiter HD 209458b 

    Sing, David K.; Vidal-Madjar, A.; Lecavelier des Etangs, A.; Desert, J.-M.; Ballester, G.; Ehrenreich, D. (IOP Publishing for American Astronomical Society, 2008)
    We present a theoretical model fit to the HST STIS optical transit transmission spectrum of HD 209458b. In our fit, we use the sodium absorption line profile along with the Rayleigh scattering by H2 to help determine the ...
  • The Earth as an extrasolar transiting planet: Earth's atmospheric composition and thickness revealed by Lunar eclipse observations 

    Vidal-Madjar, A.; Arnold, L.; Ehrenreich, D.; Ferlet, R.; Lecavelier des Etangs, A.; Bouchy, F.; Segransan, D.; Boisse, I.; Hebrard, G.; Moutou, C.; Desert, J.-M.; Sing, David K.; Cabanac, R.; Nitschelm, C.; Bonfils, X.; Delfosse, X.; Desort, M.; Diaz, R.F.; Eggenberger, A.; Forveille, T.; Lagrange, A.-M.; Lovis, C.; Pepe, F.; Perrier, C.; Pont, F.; Santos, N.C.; Udry, S. (EDP Sciences for European Southern Observatory (ESO), 2010)
    Context. An important goal within the quest for detecting an Earth-like extrasolar planet, will be to identify atmospheric gaseous bio-signatures. Aims. Observations of the light transmitted through the Earth’s atmosphere, ...
  • Erratum: The upper atmosphere of the exoplanet HD209458b revealed by the sodium D lines: temperature-pressure profile, ionization layer and thermosphere (Corrigendum). [Astronomy and Astrophysics (2011), 527, article A110, DOI: 10.1051/0004-6361/201015698] 

    Vidal-Madjar, A.; Huitson, Catherine M.; Lecavelier des Etangs, A.; Sing, David K.; Ferlet, R.; Desert, J.-M.; Hebrard, G.; Boisse, I.; Ehrenreich, D.; Moutou, C. (EDP Sciences for European Southern Observatory (ESO), 2011)
    An error was detected in the code used for the analysis of the HD209458b sodium profile (Vidal-Madjar et al. 2011). Here we present an updated T-P profile and briefly discuss the consequences.
  • Evaporation of the planet HD 189733b observed in H I Lyman-α 

    Lecavelier des Etangs, A.; Ehrenreich, D.; Vidal-Madjar, A.; Ballester, G.; Desert, J.-M.; Ferlet, R.; Hebrard, G.; Sing, David K.; Tchakoumegni, K.-O.; Udry, S. (EDP Sciences for European Southern Observatory (ESO), 2010)
    We observed three transits of the extrasolar planet HD 189733b in H i Lyman-α and in a few other lines in the ultraviolet with HST/ACS, in the search for atmospheric signatures. We detect a transit signature in the Lyman-α ...
  • The fresnel interferometric imager 

    Koechlin, Laurent; Serre, Denis; Deba, Paul; Pello, Roser; Peillon, Christelle; Duchon, Paul; Gomez de Castro, Ana Ines; Karovska, Margarita; Desert, J.-M.; Ehrenreich, D.; Hebrard, G.; Lecavelier des Etangs, A.; Ferlet, R.; Sing, David K.; Vidal-Madjar, A. (Springer Verlag, 2009)
    The Fresnel Interferometric Imager has been proposed to the European Space Agency (ESA) Cosmic Vision plan as a class L mission. This mission addresses several themes of the CV Plan: Exoplanet study, Matter in extreme ...
  • Gran Telescopio Canarias OSIRIS transiting exoplanet atmospheric survey: Detection of potassium in XO-2b from narrowband spectrophotometry 

    Sing, David K.; Desert, J.-M.; Fortney, J.J.; Lecavelier des Etangs, A.; Ballester, G.; Cepa, J.; Ehrenreich, D.; Lopez-Morales, M.; Pont, F.; Shabram, M.; Vidal-Madjar, A. (EDP Sciences, 2011)
    We present Gran Telescopio Canarias (GTC) optical transit narrowband photometry of the hot-Jupiter exoplanet XO-2b using the OSIRIS instrument. This unique instrument has the capabilities to deliver high-cadence narrowband ...
  • GTC OSIRIS transiting exoplanet atmospheric survey: Detection of sodium in XO-2b from differential long-slit spectroscopy 

    Sing, David K.; Huitson, Catherine M.; Lopez-Morales, M.; Pont, F.; Desert, J.-M.; Ehrenreich, D.; Wilson, Paul A.; Ballester, G.; Fortney, J.J.; Lecavelier des Etangs, A.; Vidal-Madjar, A. (Oxford University Press on behalf of the Royal Astronomical Society, 2012)
    We present two transits of the hot-Jupiter exoplanet XO-2b using the Gran Telescopio Canarias (GTC). The time series observations were performed using long-slit spectroscopy of XO-2 and a nearby reference star with the ...
  • Hint of a transiting extended atmosphere on 55 Cancri b 

    Ehrenreich, D.; Bourrier, V.; Bonfils, X.; Lecavelier des Etangs, A.; Hebrard, G.; Sing, David K.; Wheatley, P.J.; Vidal-Madjar, A.; Delfosse, X.; Udry, S.; Forveille, T.; Moutou, C. (EDP Sciences for European Southern Observatory (ESO), 2012)
    The naked-eye star 55 Cancri hosts a planetary system with five known planets, including a hot super-Earth (55 Cnc e) extremely close to its star and a farther out giant planet (55 Cnc b), found in milder irradiation ...
  • Magnesium in the atmosphere of the planet HD 209458 b: Observations of the thermosphere-exosphere transition region 

    Vidal-Madjar, A.; Huitson, Catherine M.; Bourrier, V.; Desert, J.-M.; Ballester, G.; Lecavelier des Etangs, A.; Sing, David K.; Ehrenreich, D.; Ferlet, R.; Hebrard, G.; McConnell, J.C. (EDP Sciences for European Southern Observatory (ESO), 2013)
    The planet HD 209458 b is one of the most well studied hot-Jupiter exoplanets. The upper atmosphere of this planet has been observed through ultraviolet/optical transit observations with H i observation of the exosphere ...
  • A non-isothermal theory for interpreting sodium lines in transmission spectra of exoplanets 

    Heng, Kevin; Wyttenbach, Aurélien; Lavie, Baptiste; Sing, David K.; Ehrenreich, D.; Lovis, C. (American Astronomical Society, 2015)
    We present a theory for interpreting the sodium lines detected in transmission spectra of exoplanetary atmospheres. Previous analyses employed the isothermal approximation and dealt only with the transit radius. By recognizing ...
  • Observation of the full 12-hour-long transit of the exoplanet HD80606b: Warm-Spitzer photometry and SOPHIE spectroscopy 

    Hebrard, G.; Desert, J.-M.; Diaz, R.F.; Boisse, I.; Bouchy, F.; Lecavelier des Etangs, A.; Moutou, C.; Ehrenreich, D.; Arnold, L.; Bonfils, X.; Delfosse, X.; Desort, M.; Eggenberger, A.; Forveille, T.; Gregorio, J.; Lagrange, A.-M.; Lovis, C.; Pepe, F.; Perrier, C.; Pont, F.; Queloz, D.; Santerne, A.; Santos, N.C.; Segransan, D.; Sing, David K.; Udry, S.; Vidal-Madjar, A. (EDP Sciences for European Southern Observatory (ESO), 2010)
    We present new observations of a transit of the 111.4-day-period exoplanet HD 80606b. Due to this long orbital period and to the orientation of the eccentric orbit (e = 0.9), HD 80606b's transits last for about 12 hours. ...
  • Search for Carbon Monoxide in the Atmosphere of the Transiting Exoplanet HD 189733b 

    Desert, J.-M.; Lecavelier des Etangs, A.; Hebrard, G.; Sing, David K.; Ehrenreich, D.; Ferlet, R.; Vidal-Madjar, A. (IOP Publishing for American Astronomical Society, 2009)
    Water, methane, and carbon monoxide are expected to be among the most abundant molecules besides molecular hydrogen in the hot atmosphere of close-in extrasolar giant planets. Atmospheric models for these planets predict ...
  • A search for methane in the atmosphere of GJ 1214b via GTC narrow-band transmission spectrophotometry 

    Wilson, Paul A.; Colon, K.D.; Sing, David K.; Ballester, G.; Desert, J.-M.; Ehrenreich, D.; Ford, E.B.; Fortney, J.J.; Lecavelier des Etangs, A.; Lopez-Morales, M.; Morley, C.V.; Pettitt, Alex R.; Pont, F.; Vidal-Madjar, A. (Oxford University Press on behalf of the Royal Astronomical Society, 2014)
    We present narrow-band photometric measurements of the exoplanet GJ 1214b using the 10.4 m Gran Telescopio Canarias and the Optical System for Imaging and low Resolution Integrated Spectroscopy instrument. Using tuneable ...
  • Spin-orbit misalignment in the HD 80606 planetary system 

    Pont, F.; Hébrard, G.; Irwin, J. M.; Bouchy, F.; Moutou, C.; Ehrenreich, D.; Guillot, T.; Aigrain, Suzanne; Bonfils, X.; Berta, Z.; Boisse, I.; Burke, C.; Charbonneau, D.; Delfosse, X.; Desort, M.; Eggenberger, A.; Forveille, T.; Lagrange, A.-M.; Lovis, C.; Nutzman, P.; Pepe, F.; Perrier, C.; Queloz, D.; Santos, N.C.; Ségransan, D.; Udry, S.; Vidal-Madjar, A. (EDP Sciences, 2009)
    We recently reported the photometric and spectroscopic detection of the primary transit of the 111-day-period, eccentric extra-solar planet HD80606b, at Observatoire de Haute-Provence, France. The whole egress of the primary ...
  • A Spitzer search for water in the transiting exoplanet HD 189733b 

    Ehrenreich, D.; Hebrard, G.; Lecavelier des Etangs, A.; Sing, David K.; Desert, J.-M.; Bouchy, F.; Ferlet, R.; Vidal-Madjar, A. (IOP Publishing for American Astronomical Society, 2007)
    We present Spitzer Space Telescope observations of the extrasolar planet HD 189733b primary transit, obtained simultaneously at 3.6 and 5.8 μm with the Infrared Array Camera. The system parameters, including planetary ...
  • Temporal variations in the evaporating atmosphere of the exoplanet HD 189733b 

    Lecavelier des Etangs, A.; Bourrier, V.; Wheatley, P.J.; Dupuy, H.; Ehrenreich, D.; Vidal-Madjar, A.; Hebrard, G.; Ballester, G.; Desert, J.-M.; Ferlet, R.; Sing, David K. (EDP Sciences for European Southern Observatory (ESO), 2012)
    Atmospheric escape has been detected from the exoplanet HD 209458b through transit observations of the hydrogen Lyman-α line. Here we present spectrally resolved Lyman-α transit observations of the exoplanet HD 189733b at ...
  • TiO and VO broad band absorption features in the optical spectrum of the atmosphere of the hot-Jupiter HD 209458b 

    Desert, J.-M.; Vidal-Madjar, A.; Lecavelier des Etangs, A.; Sing, David K.; Ehrenreich, D.; Hebrard, G.; Ferlet, R. (EDP Sciences for European Southern Observatory (ESO), 2008)
    Aims. The presence of titanium oxide (TiO) and vanadium oxide (VO) gas phase species is searched for in the atmosphere of the hot Jupiter HD 209458b . Methods. We compared a model for the planet's transmitted spectrum to ...
  • Transit spectrophotometry of the exoplanet HD 189733b. II. New Spitzer observations at 3.6 μm 

    Desert, J.-M.; Sing, David K.; Vidal-Madjar, A.; Hebrard, G.; Ehrenreich, D.; Lecavelier des Etangs, A.; Parmentier, V.; Ferlet, R.; Henry, G. (EDP Sciences for European Southern Observatory (ESO), 2011)
    Context. We present a new primary transit observation of the hot-jupiter HD 189733b, obtained at 3.6 μm with the Infrared Array Camera (IRAC) onboard the Spitzer Space Telescope. Previous measurements at 3.6 microns suffered ...
  • The upper atmosphere of the exoplanet HD 209458 b revealed by the sodium D lines. Temperature-pressure profile, ionization layer, and thermosphere 

    Vidal-Madjar, A.; Sing, David K.; Lecavelier des Etangs, A.; Ferlet, R.; Desert, J.-M.; Hebrard, G.; Boisse, I.; Ehrenreich, D.; Moutou, C. (EDP Sciences for European Southern Observatory (ESO), 2011)
    A complete reassessment of the Hubble Space Telescope (HST) observations of the transits of the extrasolar planet HD 209458 b has provided a transmission spectrum of the atmosphere over a wide range of wavelengths. Analysis ...