Search Publications
A Near-infrared Transmission Spectrum for the Warm Saturn HAT-P-12b
Deming, Drake; Knutson, Heather; Line, Michael R. +2 more
We present a Hubble Space Telescope Wide Field Camera-3 (WFC3) transmission spectrum for the transiting exoplanet HAT-P-12b. This warm (1000 K) sub-Saturn-mass planet has a smaller mass and a lower temperature than the hot Jupiters that have been studied so far. We find that the planet's measured transmission spectrum lacks the expected water abso…
The COS/UVES Absorption Survey of the Magellanic Stream. II. Evidence for a Complex Enrichment History of the Stream from the Fairall 9 Sightline
Richter, Philipp; Bland-Hawthorn, Joss; Fox, Andrew J. +5 more
We present a multi-wavelength study of the Magellanic Stream (MS), a massive gaseous structure in the Local Group that is believed to represent material stripped from the Magellanic Clouds. We use ultraviolet, optical and radio data obtained with HST/COS, VLT/UVES, FUSE, GASS, and ATCA to study metal abundances and physical conditions in the Strea…
QSO Absorption Systems Detected in Ne VIII: High-metallicity Clouds with a Large Effective Cross Section
Sembach, K. R.; Lehner, N.; Jenkins, E. B. +5 more
Using high-resolution, high signal-to-noise ultraviolet spectra of the z em = 0.9754 quasar PG1148+549 obtained with the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope, we study the physical conditions and abundances of Ne VIII+O VI absorption line systems at z abs = 0.68381, 0.70152, 0.72478. In addition to …
Crater-based dating of geological units on Mars: Methods and application for the new global geological map
Tanaka, Kenneth L.; Platz, Thomas; Michael, Gregory +2 more
The new, post-Viking generation of Mars orbital imaging and topographical data provide significant higher-resolution details of surface morphologies, which induced a new effort to photo-geologically map the surface of Mars at 1:20,000,000 scale. Although from unit superposition relations a relative stratigraphical framework can be compiled, it was…
Constraints on dark energy with the LOSS SN Ia sample
Filippenko, Alexei V.; Li, Weidong; Ganeshalingam, Mohan
We present a cosmological analysis of the Lick Observatory Supernova Search (LOSS) Type Ia supernova (SN Ia) photometry sample introduced by Ganeshalingam et al. These supernovae (SNe) provide an effective anchor point to estimate cosmological parameters when combined with data sets at higher redshift. The data presented by Ganeshalingam et al. ha…
Quiet Sun magnetic fields observed by Hinode: Support for a local dynamo
Solanki, S. K.; Lagg, A.; Buehler, D.
Context. The Hinode mission has revealed copious amounts of horizontal flux covering the quiet Sun. Local dynamo action has been proposed to explain the presence of this flux.
Aims: We sought to test whether the quiet Sun flux detected by Hinode is due to a local or the global dynamo by studying long-term variations in the polarisation signal…
The polarized gamma-ray burst GRB 061122
Covino, S.; Götz, D.; Bošnjak, Ž. +2 more
We report on the polarization measure, obtained with IBIS on board INTEGRAL, of the prompt emission of GRB 061122. Over an 8 s interval containing the brightest part of the gamma-ray burst (GRB) we put a lower limit on its polarization fraction of 60 per cent at 68 per cent confidence level (c.l.) and of 33 per cent at 90 per cent c.l. on the 250-…
A Herschel Study of D/H in Water in the Jupiter-family Comet 45P/Honda-Mrkos-Pajdušáková and Prospects for D/H Measurements with CCAT
Küppers, M.; Hartogh, P.; Crovisier, J. +11 more
We present Herschel observations of water isotopologues in the atmosphere of the Jupiter-family comet 45P/Honda-Mrkos-Pajdušáková. No HDO emission is detected, with a 3σ upper limit of 2.0 × 10-4 for the D/H ratio. This value is consistent with the earlier Herschel measurement in the Jupiter-family comet 103P/Hartley 2. The canonical va…
CANDELS: The Correlation between Galaxy Morphology and Star Formation Activity at z ~ 2
Bell, Eric F.; Ferguson, Henry C.; Giavalisco, Mauro +13 more
We discuss the state of the assembly of the Hubble sequence in the mix of bright galaxies at redshift 1.4 < z <= 2.5 with a large sample of 1671 galaxies down to H AB ~ 26, selected from the HST/ACS and WFC3 images of the GOODS-South field obtained as part of the GOODS and CANDELS observations. We investigate the relationship betw…
Distribution of High-mass X-Ray Binaries in the Milky Way
Coleiro, Alexis; Chaty, Sylvain
Observations of the high-energy sky, particularly with the INTEGRAL satellite, have quadrupled the number of supergiant X-ray binaries observed in the Galaxy and revealed new populations of previously hidden high-mass X-ray binaries (HMXBs), raising new questions about their formation and evolution. The number of detected HMXBs of different types …