Hst hot jupiter transmission spectral survey: Detection of water in HAT-P-1b from WFC3 near-IR spatial scan observations

We present Hubble Space Telescope near-infrared transmission spectroscopy of the transiting hot-Jupiter HAT-P-1b. We observed one transit with Wide Field Camera 3 using the G141 low-resolution grism to cover the wavelength range 1.0871.678 m. These time series observations were taken with the newly available spatial scan mode that increases the duty cycle by nearly a factor of two, thus improving the resulting photometric precision of the data. We measure a planet-to-star radius ratio of Rp/R =0.11709 0.00038 in the white light curve with the centre of transit occurring at 2456114.345 0.000133 (JD). We achieve S/N levels per exposure of 1840 (0.061 %) at a resolution of =19.2 nm (R 70) in the 1.1173 - 1.6549 m spectral region, providing the precision necessary to probe the transmission spectrum of the planet at close to the resolution limit of the instrument. We compute the transmission spectrum using both single target and dierential photometry with similar results. The resultant transmission spectrum shows a signicant absorption above the 5level matching the 1.4 m water absorption band. In solar composition models, the water absorption is sensitive to the 1 mbar pressure levels at the terminator. The detected absorption agrees with that predicted by an 1000 K isothermal model, as well as with that predicted by a planetary-averaged temperature model.

[1]  Jonathan Tennyson,et al.  Water vapour in the atmosphere of a transiting extrasolar planet , 2007, Nature.

[2]  Mark Clampin,et al.  INFRARED TRANSMISSION SPECTROSCOPY OF THE EXOPLANETS HD 209458b AND XO-1b USING THE WIDE FIELD CAMERA-3 ON THE HUBBLE SPACE TELESCOPE , 2013, 1302.1141.

[3]  Carl J. Grillmair,et al.  Strong water absorption in the dayside emission spectrum of the planet HD 189733b , 2008, Nature.

[4]  S. Aigrain,et al.  The prevalence of dust on the exoplanet HD 189733b from Hubble and Spitzer observations , 2012, 1210.4163.

[5]  J. Walsh,et al.  WFC3 SMOV proposal 11552: Calibration of the G141 grism , 2009 .

[6]  K. Lodders.  Alkali Element Chemistry in Cool Dwarf Atmospheres , 1999 .

[7]  M. Marley,et al.  Line and Mean Opacities for Ultracool Dwarfs and Extrasolar Planets , 2007, 0706.2374.

[8]  L. Koesterke,et al.  Sodium Absorption from the Exoplanetary Atmosphere of HD 189733b Detected in the Optical Transmission Spectrum , 2007, 0712.0761.

[9]  Gautam Vasisht,et al.  The presence of methane in the atmosphere of an extrasolar planet , 2008, Nature.

[10]  A. P. Showman,et al.  TRANSMISSION SPECTRA OF THREE-DIMENSIONAL HOT JUPITER MODEL ATMOSPHERES , 2009, 0912.2350.

[11]  D. Ehrenreich,et al.  SEARCH FOR CARBON MONOXIDE IN THE ATMOSPHERE OF THE TRANSITING EXOPLANET HD 189733b , 2009, 0903.3405.

[12]  N. Gibson,et al.  Hubble Space Telescope transmission spectroscopy of the exoplanet HD 189733b: high‐altitude atmospheric haze in the optical and near‐ultraviolet with STIS , 2011, 1103.0026.

[13]  C. G. Tinney,et al.  Catalog of nearby exoplanets , 2006 .

[14]  Chemistry of Low Mass Substellar Objects , 2006, astro-ph/0601381.

[15]  T. Brown.  Transmission Spectra as Diagnostics of Extrasolar Giant Planet Atmospheres , 2001, astro-ph/0101307.

[16]  T. Evans,et al.  An HST optical-to-near-IR transmission spectrum of the hot Jupiter WASP-19b: detection of atmospheric water and likely absence of TiO , 2013, 1307.2083.

[17]  Caltech,et al.  Probing the haze in the atmosphere of HD 189733b with HST/WFC3 transmission spectroscopy , 2012, 1201.6573.

[18]  J. Fortney,et al.  THE FLAT TRANSMISSION SPECTRUM OF THE SUPER-EARTH GJ1214b FROM WIDE FIELD CAMERA 3 ON THE HUBBLE SPACE TELESCOPE , 2011, 1111.5621.

[19]  Nikku Madhusudhan,et al.  C/O RATIO AS A DIMENSION FOR CHARACTERIZING EXOPLANETARY ATMOSPHERES , 2012, 1209.2412.

[20]  W. C. Bowman,et al.  SPITZER IRAC SECONDARY ECLIPSE PHOTOMETRY OF THE TRANSITING EXTRASOLAR PLANET HAT-P-1b , 2009, 0911.2218.

[21]  David Charbonneau,et al.  Hubble Space Telescope Time-Series Photometry of the Transiting Planet of HD?209458 , 2001 .

[22]  Marcell Tessenyi,et al.  Probing the extreme planetary atmosphere of WASP-12b , 2012, 1205.4736.

[23]  Kevin France,et al.  OBSERVATIONS OF MASS LOSS FROM THE TRANSITING EXOPLANET HD 209458b , 2010, 1005.1633.

[24]  E. Agol,et al.  Analytic Light Curves for Planetary Transit Searches , 2002, astro-ph/0210099.

[25]  Frederic Pont,et al.  The effect of red noise on planetary transit detection , 2006, astro-ph/0608597.

[26]  The GROUSE project - II. Detection of the Ks-band secondary eclipse of exoplanet HAT-P-1b , 2011, 1103.0035.

[27]  M. Holman,et al.  Accepted for publication in The Astrophysical Journal Preprint typeset using L ATEX style emulateapj v. 10/09/06 IMPROVED PARAMETERS FOR EXTRASOLAR TRANSITING PLANETS , 2008 .

[28]  B. Fegley,et al.  Atmospheric Chemistry in Giant Planets, Brown Dwarfs, and Low-Mass Dwarf Stars: I. Carbon, Nitrogen, and Oxygen , 2002 .

[29]  Cambridge,et al.  HAT-P-20b–HAT-P-23b: FOUR MASSIVE TRANSITING EXTRASOLAR PLANETS , 2010, 1008.3388.

[30]  R. Freedman,et al.  CHEMICAL CONSEQUENCES OF THE C/O RATIO ON HOT JUPITERS: EXAMPLES FROM WASP-12b, CoRoT-2b, XO-1b, AND HD 189733b , 2012, The Astrophysical journal.

[31]  David K. Sing,et al.  Stellar limb-darkening coefficients for CoRot and Kepler , 2009, 0912.2274.

[32]  C. Moutou,et al.  Hubble Space Telescope time-series photometry of the planetary transit of HD 189733: no moon, no rings, starspots , 2007, 0707.1940.

[33]  Mark Taylor,et al.  Astronomical Data Analysis Software and Systems XXII , 2013 .

[34]  A. Burrows,et al.  Chemical Equilibrium Abundances in Brown Dwarf and Extrasolar Giant Planet Atmospheres , 1999 .

[35]  Jonathan Tennyson,et al.  BLIND EXTRACTION OF AN EXOPLANETARY SPECTRUM THROUGH INDEPENDENT COMPONENT ANALYSIS , 2013, 1301.4041.

[36]  Adam Burrows,et al.  PHOTOMETRIC AND SPECTRAL SIGNATURES OF THREE-DIMENSIONAL MODELS OF TRANSITING GIANT EXOPLANETS , 2010, 1005.0346.

[37]  Lotfi Ben-Jaffel,et al.  Hubble Space Telescope detection of oxygen in the atmosphere of exoplanet HD 189733b , 2013, 1303.4232.

[38]  R. Gilliland,et al.  Detection of an Extrasolar Planet Atmosphere , 2001, astro-ph/0111544.

[39]  A. Burrows,et al.  THEORETICAL TRANSIT SPECTRA FOR GJ 1214b AND OTHER “SUPER-EARTHS” , 2012, 1203.1921.

[40]  Princeton,et al.  Theoretical Transmission Spectra during Extrasolar Giant Planet Transits , 1999, astro-ph/9912241.

[41]  B. Scott Gaudi,et al.  EXOFAST: A Fast Exoplanetary Fitting Suite in IDL , 2012, 1206.5798.

[42]  M. Asplund,et al.  Limb darkening laws for two exoplanet host stars derived from 3D stellar model atmospheres Comparison with 1D models and HST light curve observations , 2012, 1202.0548.

[43]  A. Burrows,et al.  Atomic and Molecular Opacities for Brown Dwarf and Giant Planet Atmospheres , 2006, astro-ph/0607211.

[44]  P. J. Wheatley,et al.  Temporal variations in the evaporating atmosphere of the exoplanet HD 189733b , 2012, 1206.6274.

[45]  B. Fegley,et al.  Atmospheric Chemistry in Giant Planets, Brown Dwarfs, and Low-Mass Dwarf Stars. II. Sulfur and Phosphorus , 2005, astro-ph/0511136.

[46]  Daniel Durand,et al.  Astronomical Data Analysis Software and Systems XI , 2009 .

[47]  Jonathan J. Fortney,et al.  The effect of condensates on the characterization of transiting planet atmospheres with transmission spectroscopy , 2005, astro-ph/0509292.

[48]  S. Albrecht,et al.  Ground-based detection of sodium in the transmission spectrum of exoplanet HD209458b , 2008, 0805.0789.

[49]  Carnegie,et al.  HAT-P-1b: A Large-Radius, Low-Density Exoplanet Transiting One Member of a Stellar Binary* ** , 2007 .

[50]  K. Lodders.  Titanium and Vanadium Chemistry in Low-Mass Dwarf Stars , 2002 .

[51]  R. Paul Butler,et al.  Measurement of the Spin-Orbit Angle of Exoplanet HAT-P-1b , 2008, 0806.1734.

[52]  M. Mayor,et al.  An extended upper atmosphere around the extrasolar planet HD209458b , 2003, Nature.