CHARACTERIZING THE ATMOSPHERES OF THE HR8799 PLANETS WITH HST/WFC3

Rajan, Abhijith; Patience, Jennifer; Barman, Travis; Soummer, Rémi; Hagan, J. Brendan; Pueyo, Laurent; Choquet, Élodie; Konopacky, Quinn; Macintosh, Bruce; Marois, Christian

doi:10.1088/2041-8205/809/2/L33

Title: CHARACTERIZING THE ATMOSPHERES OF THE HR8799 PLANETS WITH HST/WFC3

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Abstract

We present results from a Hubble Space Telescope (HST) program characterizing the atmospheres of the outer two planets in the HR8799 system. The images were taken over 15 orbits in three near-infrared (near-IR) medium-band filters—F098M, F127M, and F139M—using the Wide Field Camera 3. One of the three filters is sensitive to a water absorption band inaccessible from ground-based observations, providing a unique probe of the thermal emission from the atmospheres of these young giant planets. The observations were taken at 30 different spacecraft rolls to enable angular differential imaging (ADI), and the full data set was analyzed with the Karhunen–Loéve Image Projection routine, an advanced image processing algorithm adapted to work with HST data. To achieve the required high contrast at subarcsecond resolution, we utilized the pointing accuracy of HST in combination with an improved pipeline designed to combine the dithered ADI data with an algorithm designed to both improve the image resolution and accurately measure the photometry. The results include F127M (J) detections of the outer planets, HR8799b and c, and the first detection of HR8799b in the water-band (F139M) filter. The F127M photometry for HR8799c agrees well with fitted atmospheric models, resolving the longstanding difficulty in consistently modelingmore » the near-IR flux of the planet.« less

Authors:

Rajan, Abhijith; Patience, Jennifer ^[1]; Barman, Travis ^[2]; Soummer, Rémi; Hagan, J. Brendan; Pueyo, Laurent; Choquet, Élodie ^[3]; Konopacky, Quinn ^[4]; Macintosh, Bruce ^[5]; Marois, Christian ^[6]

School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85282 (United States)
Department of Planetary Sciences and Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721 (United States)
Space Telescope Science Institute, Baltimore, MD 21218 (United States)
Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4 (Canada)
Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA 94305 (United States)
National Research Council of Canada Herzberg, Victoria, BC V9E 2E7 (Canada)

Publication Date:: Thu Aug 20 00:00:00 EDT 2015

OSTI Identifier:: 22518901

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal Letters

Additional Journal Information:: Journal Volume: 809; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION SPECTRA; ALGORITHMS; CAMERAS; DETECTION; IMAGE PROCESSING; IMAGES; MASS; NEAR INFRARED RADIATION; PHOTOMETRY; PLANETARY ATMOSPHERES; PLANETS; RESOLUTION; SPACE; SPACE VEHICLES; STARS; TELESCOPES; WATER

Citation Formats


                    Rajan, Abhijith, Patience, Jennifer, Barman, Travis, Soummer, Rémi, Hagan, J. Brendan, Pueyo, Laurent, Choquet, Élodie, Konopacky, Quinn, Macintosh, Bruce, and Marois, Christian. CHARACTERIZING THE ATMOSPHERES OF THE HR8799 PLANETS WITH HST/WFC3.  United States: N. p., 2015. 
        Web.  doi:10.1088/2041-8205/809/2/L33.

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                    Rajan, Abhijith, Patience, Jennifer, Barman, Travis, Soummer, Rémi, Hagan, J. Brendan, Pueyo, Laurent, Choquet, Élodie, Konopacky, Quinn, Macintosh, Bruce, & Marois, Christian. CHARACTERIZING THE ATMOSPHERES OF THE HR8799 PLANETS WITH HST/WFC3.  United States.  https://doi.org/10.1088/2041-8205/809/2/L33

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                    Rajan, Abhijith, Patience, Jennifer, Barman, Travis, Soummer, Rémi, Hagan, J. Brendan, Pueyo, Laurent, Choquet, Élodie, Konopacky, Quinn, Macintosh, Bruce, and Marois, Christian. 2015.  
        "CHARACTERIZING THE ATMOSPHERES OF THE HR8799 PLANETS WITH HST/WFC3".  United States.  https://doi.org/10.1088/2041-8205/809/2/L33.

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@article{osti_22518901,

  title        = {CHARACTERIZING THE ATMOSPHERES OF THE HR8799 PLANETS WITH HST/WFC3},

  author       = {Rajan, Abhijith and Patience, Jennifer and Barman, Travis and Soummer, Rémi and Hagan, J. Brendan and Pueyo, Laurent and Choquet, Élodie and Konopacky, Quinn and Macintosh, Bruce and Marois, Christian},

  abstractNote = {We present results from a Hubble Space Telescope (HST) program characterizing the atmospheres of the outer two planets in the HR8799 system. The images were taken over 15 orbits in three near-infrared (near-IR) medium-band filters—F098M, F127M, and F139M—using the Wide Field Camera 3. One of the three filters is sensitive to a water absorption band inaccessible from ground-based observations, providing a unique probe of the thermal emission from the atmospheres of these young giant planets. The observations were taken at 30 different spacecraft rolls to enable angular differential imaging (ADI), and the full data set was analyzed with the Karhunen–Loéve Image Projection routine, an advanced image processing algorithm adapted to work with HST data. To achieve the required high contrast at subarcsecond resolution, we utilized the pointing accuracy of HST in combination with an improved pipeline designed to combine the dithered ADI data with an algorithm designed to both improve the image resolution and accurately measure the photometry. The results include F127M (J) detections of the outer planets, HR8799b and c, and the first detection of HR8799b in the water-band (F139M) filter. The F127M photometry for HR8799c agrees well with fitted atmospheric models, resolving the longstanding difficulty in consistently modeling the near-IR flux of the planet.},

  doi          = {10.1088/2041-8205/809/2/L33},

  url          = {https://www.osti.gov/biblio/22518901},
  journal      = {Astrophysical Journal Letters},

  issn         = {2041-8205},

  number       = 2,

  volume       = 809,

  place        = {United States},

  year         = {Thu Aug 20 00:00:00 EDT 2015},

  month        = {Thu Aug 20 00:00:00 EDT 2015}

}

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