Search Publications
Protoplanetary Disk Shadowing by Gas Infalling onto the Young Star AK Sco
France, Kevin; Gómez de Castro, Ana I.; Loyd, Robert O. P. +2 more
Young solar-type stars grow through the accretion of material from the circumstellar disk during pre-main-sequence (PMS) evolution. The ultraviolet radiation generated in this process plays a key role in the chemistry and evolution of young planetary disks. In particular, the hydrogen Lyα line (Lyα) etches the disk surface by driving photoevaporat…
A VLA Survey for Faint Compact Radio Sources in the Orion Nebula Cluster
Williams, Jonathan P.; Sheehan, Patrick D.; Eisner, Josh A. +1 more
We present Karl G. Jansky Very Large Array 1.3, 3.6, and 6 cm continuum maps of compact radio sources in the Orion Nebular Cluster (ONC). We mosaicked 34 arcmin2 at 1.3 cm, 70 arcmin2 at 3.6 cm and 109 arcmin2 at 6 cm, containing 778 near-infrared detected young stellar objects and 190 Hubble Space Telescope-identi…
A Symmetric Inner Cavity in the HD 141569A Circumstellar Disk
Augereau, J. -C.; Boccaletti, A.; Lagrange, A. -M. +6 more
Some circumstellar disks, called transitional or hybrid disks, present characteristics of both protoplanetary disks (significant amount of gas) and debris disks (evolved structures around young main-sequence stars, composed of second generation dust, from collisions between planetesimals). Therefore, they are ideal astrophysical laboratories to wi…
Suzaku Wide-band All-sky Monitor measurements of duration distributions of gamma-ray bursts
Yamaoka, Kazutaka; Fukazawa, Yasushi; Hanabata, Yoshitaka +25 more
We report on the T90 and T50 duration distributions and their relations with spectral hardness using 1464 gamma-ray bursts (GRBs), which were observed by the Suzaku Wide-band All-sky Monitor (WAM) from 2005 August 4 to 2010 December 29. The duration distribution is clearly bimodal in three energy ranges (50-120, 120-250, and …
Long-term nadir observations of the O2 dayglow by SPICAM IR
Montmessin, F.; Fedorova, A.; Korablev, O. +4 more
The O2(a1Δg) dayglow at the 1.27 µm band on Mars is produced by the solar UV photolysis of ozone and quenched in collisions with CO2. The SPICAM IR instrument onboard the Mars Express orbiter observes the O2(a1Δg) emission in the Martian atmosphere starting from 200…
Kinematics and Magnetic Properties of a Light Bridge in a Decaying Sunspot
Guglielmino, S. L.; Romano, P.; Borrero, J. M. +7 more
We present the results obtained by analysing high spatial and spectral resolution data of the solar photosphere acquired by the CRisp Imaging SpectroPolarimeter at the Swedish Solar Telescope on 6 August 2011 of a large sunspot with a light bridge (LB) observed in NOAA AR 11263. These data are complemented by simultaneous Hinode Spectropolarimeter…
Two evolved supernova remnants with newly identified Fe-rich cores in the Large Magellanic Cloud
Haberl, F.; Filipović, M. D.; Maggi, P. +7 more
Aims: We present a multi-wavelength analysis of the evolved supernova remnants
Methods: We used observational data from XMM-Newton, the Australian Telescope Compact Array, and the Magellanic Cloud Emission Line Survey to study their…
Characteristics of proton velocity distribution functions in the near-lunar wake from Chandrayaan-1/SWIM observations
Barabash, Stas; Holmström, Mats; Futaana, Yoshifumi +5 more
Due to the high absorption of solar wind plasma on the lunar dayside, a large scale wake structure is formed downstream of the Moon. However, recent in-situ observations have revealed the presence of protons in the near-lunar wake (100 km to 200 km from the surface). The solar wind, either directly or after interaction with the lunar surface (incl…
Noncircular features in Saturn's rings III: The Cassini Division
Nicholson, Philip D.; French, Richard G.; McGhee-French, Colleen A. +5 more
We have conducted a comprehensive survey of 22 sharp-edged ringlets and gaps in the Cassini Division of Saturn's rings, making use of nearly 200 high-SNR stellar and radio occultation chords obtained by the Cassini VIMS, UVIS, and RSS instruments between 2005 and 2013. We measure eccentricities from as small as ae = 80 m to nearly 30 km, free norm…
Herschel/HIFI Spectral Mapping of C+, CH+, and CH in Orion BN/KL: The Prevailing Role of Ultraviolet Irradiation in CH+ Formation
Bergin, Edwin A.; Neufeld, David A.; Ossenkopf-Okada, Volker +8 more
The CH+ ion is a key species in the initial steps of interstellar carbon chemistry. Its formation in diverse environments where it is observed is not well understood, however, because the main production pathway is so endothermic (4280 K) that it is unlikely to proceed at the typical temperatures of molecular clouds. We investigate the …