Poster Abstracts - Kepler - NASA

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POSTER ABSTRACTSP0204. POSTER SESSION ISPITZER EVIDENCE FOR A PLANET DRIVEN LATE HEAVY BOMBARDMENT IN η CORVIAT ~1 GYR. C.M. Lisse 1 , 1 Johns Hopkins University Applied Physics Laboratory, 11100 Johns HopkinsRoad, Laurel, MD 20723; carey.lisse@jhuapl.eduAbstract. We have analyzed Spitzer andNASA/IRTF 2 – 35 µm spectra of the warm,~350 K circumstellar dust around the nearby MSstar η Corvi (F2V, 1.4 ± 0.3 Gyr). The spectrashow clear evidence for warm, water- andcarbon-rich dust at ~3 AU from the central star,in the system’s Terrestrial Habitability Zone.Spectral features due to ultra-primitive cometarymaterial were found, in addition to features dueto impact produced silica and high temperaturecarbonaceous phases. At least 9 x 10 18 kg of 0.1– 100 µm warm dust is present in a collisionalequilibrium distribution with dn/da ~ a -3.5 , theequivalent of a 130 km radius KBO of 1.0 g/cm 3density and similar to recent estimates of themass delivered to the Earth at 0.6 – 0.8 Gyrduring the Late Heavy Bombardment. Weconclude that the parent body was a Kuiper-Beltbody or bodies which captured a large amount ofearly primitive material in the first Myrs of thesystem’s lifetime and preserved it in deep freezeat ~150 AU. At ~1.4 Gyr they were prompted bydynamical stirring of the parent Kuiper Belt intospiraling into the inner system, eventuallycolliding at 5-10 km/sec with a rocky planetarybody of mass ≤ M Earth at ~3 AU, delivering largeamounts of water (>0.1% of M Earth’s Oceans ) andcarbon-rich material. The Spitzer spectrum alsoclosely matches spectra reported for the Ureilitemeteorites of the Sudan Almahata Sitta fall in2008, suggesting that one of the Ureilite parentbodies was a KBO.1522011 Kepler Science Conference - NASA Ames Research Center
POSTER ABSTRACTSP0205. POSTER SESSION ITransit Spectroscopy of sub-Neptune-sized Planets GJ1214b and HD97658b with HST WFC3. P. R.McCullough 1 , 1 STScI (3700 San Martin Dr., Baltimore MD 21218, pmcc@stsci.edu).Abstract: We analyze 1.1-1.7 micron spectra of atransit of the super-Earth GJ1214b obtained 2011-4-18during re-commissioning of a technique for spatiallyscanning the Hubble Space Telescope (Figure 1).These are the first data of this type obtained with theHST instrument WFC3. Results are directly comparedto staring-mode observations with the same instrumentof the same target by Berta et al. [1]. Spatial scanningis expected to have some advantages over staringmodeobservations with existing HST instruments,especially for very bright stars, i.e. those that intrinsicallycan provide the highest sensitivity observations.We also describe a case study of the sub-Neptunesizedplanet HD 97658b in terms of proposed observationsand what they may reveal of that planet. We alsosummarize publicly-available descriptions of additionalHST programs that use the spatial-scanning technique(Table 1).References:[1] Berta, Z. K. et al. 2011, submitted to ApJ.Table 1HST program, Title, Investigators, Scanned Targets12181 The Atmospheric Structure of Giant HotExoplanets, Deming, L. D. et al., HD 209458 and HD18973312325 Photometry with Spatial Scans, MacKenty,J. W., & McCullough, P. R., GJ121412336 Scan Enabled Photometry, MacKenty, J. W.,McCullough, P. R., & Deustua, S., Vega and othercalibration stars12449 Atmospheric Composition of the ExoNeptuneHAT-P-11, Deming, L. D., et al., HAT-P-1112473 An Optical Transmission Spectral Survey ofhot-Jupiter Exoplanetary Atmospheres, Sing, D. K. etal., WASP-31, HAT-P-112495 Near-IR Spectroscopy of the Hottest KnownExoplanet, WASP-33b, Deming, L. D. et al., WASP-3312679 Luminosity-Distance Standards from Gaiaand HST, Riess, A., et al., Milky Way CepheidsFigure 1: The spatially scanned spectrum of the starGJ1214 is labeled with its 0 th and 1 st order light andcompared to a nominal staring-mode slitless spectrumof the same field (below the blue line). The scan was40 pixels high (4.8 arcsec).2011 Kepler Science Conference - NASA Ames Research Center 153
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Poster Abstracts - Kepler - NASA

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