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Ground-based Near-infrared Emission Spectroscopy of HD 189733b
Drossart, P.; Waldmann, I. P.; Tinetti, G. +3 more
We investigate the K- and L-band dayside emission of the hot-Jupiter HD 189733b with three nights of secondary eclipse data obtained with the SpeX instrument on the NASA Infrared Telescope Facility. The observations for each of these three nights use equivalent instrument settings and the data from one of the nights have previously been reported b…
Optical constants of Titan's stratospheric aerosols in the 70-1500 cm-1 spectral range constrained by Cassini/CIRS observations
Bézard, Bruno; Vinatier, Sandrine; de Kok, Remco +3 more
We utilized aerosol extinction coefficient inferred from Cassini/CIRS spectra in the far and mid infrared region to derive the extinction cross-section near an altitude of 190 km at 15°S (from far-IR) and 20°S (from mid-IR). By comparing the extinction cross section that are derived from observations with theoretical calculations for a fractal agg…
The Star Formation History of Leo T from Hubble Space Telescope Imaging
Bell, Eric F.; Dolphin, Andrew E.; Williams, Benjamin F. +9 more
We present the star formation history (SFH) of the faintest known star-forming galaxy, Leo T, based on deep imaging taken with the Hubble Space Telescope (HST) Wide Field Planetary Camera 2 (WFPC2). The HST/WFPC2 color-magnitude diagram (CMD) of Leo T is exquisitely deep, extending ~2 mag below the oldest main-sequence turnoff, permitting excellen…
Dynamical properties of the Venus mesosphere from the radio-occultation experiment VeRa onboard Venus Express
Pätzold, M.; Häusler, B.; Tellmann, S. +4 more
The dynamics of Venus' mesosphere (60-100 km altitude) was investigated using data acquired by the radio-occultation experiment VeRa on board Venus Express. VeRa provides vertical profiles of density, temperature and pressure between 40 and 90 km of altitude with a vertical resolution of few hundred meters of both the Northern and Southern hemisph…
The First Observations of Low-redshift Damped Lyα Systems with the Cosmic Origins Spectrograph: Chemical Abundances and Affiliated Galaxies
Lehner, N.; Jenkins, E. B.; Prochaska, J. X. +6 more
We present Cosmic Origins Spectrograph (COS) measurements of metal abundances in eight 0.083 < z abs < 0.321 damped Lyα (DLA) and sub-DLA absorption systems serendipitously discovered in the COS-Halos survey. We find that these systems show a large range in metallicities, with -1.10 < [Z/H] < 0.31, similar to the spread foun…
Mean-flux-regulated Principal Component Analysis Continuum Fitting of Sloan Digital Sky Survey Lyα Forest Spectra
Spergel, David N.; Suzuki, Nao; Lee, Khee-Gan
Continuum fitting is an important aspect of Lyα forest science, since errors in the derived optical depths scale with the fractional continuum error. However, traditional methods of estimating continua in noisy and moderate-resolution spectra (e.g., Sloan Digital Sky Survey, SDSS; S/N <~ 10 pixel-1 and R ~ 2000), such as power-law ex…
The missing link: a low-mass X-ray binary in M31 seen as an ultraluminous X-ray source
Done, Chris; Middleton, Matthew J.; Sutton, Andrew D. +2 more
A new, transient ultraluminous X-ray source (ULX) was recently discovered by Chandra in M31 with a luminosity at ∼5 × 1039 erg s-1. Here we analyse a series of five subsequent XMM-Newton observations. These show a steady decline in X-ray luminosity over 1.5 months, from 1.8 × 1039 to 0.6 × 1039 erg s
A Spitzer MIPS Study of 2.5-2.0 M ⊙ Stars in Scorpius-Centaurus
Chen, Christine H.; Mamajek, Eric E.; Su, Kate Y. L. +2 more
We have obtained Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS) 24 µm and 70 µm observations of 215 nearby, Hipparcos B- and A-type common proper-motion single and binary systems in the nearest OB association, Scorpius-Centaurus. Combining our MIPS observations with those of other ScoCen stars in the literature…
Detection of warm water vapour in Taurus protoplanetary discs by Herschel
Pinte, C.; Ménard, F.; Dent, W. R. F. +12 more
Line spectra of 68 Taurus T Tauri stars were obtained with the Herschel-PACS (Photodetector Array Camera and Spectrometer) instrument as part of the GASPS (GAS evolution in Protoplanetary Systems) survey of protoplanetary discs. A careful examination of the linescans centred on the [OI] 63.18 µm fine-structure line unveiled a line at 63.32 &…
Three-dimensional ray tracing of fast magnetosonic waves
Xiao, Fuliang; Zhou, Qinghua; He, Zhaoguo +1 more
A three dimensional ray tracing of fast magnetosonic (MS) waves is first performed by using a global core density model and a field-aligned density model. Simulating results show that MS waves are primarily confined within a few degrees of the geomagnetic equator due to magnetospheric reflection. MS waves originating from different L-shells on the…