Search Publications
Precision astrometry of the exoplanet host candidate GD 66
Farihi, J.; Nelan, E. P.; Nordhaus, J. +4 more
The potential existence of a giant planet orbiting within a few au of a stellar remnant has profound implications for both the survival and possible regeneration of planets during post-main-sequence stellar evolution. This paper reports Hubble Space Telescope Fine Guidance Sensor and US Naval Observatory relative astrometry of GD 66, a white dwarf…
Herschel SPIRE observations of the TWA brown dwarf disc 2MASSW J1207334-393254
Lodato, G.; Riaz, B.; Stamatellos, D. +1 more
We present Herschel/SPIRE observations for the 2MASS 1207334-393254 (2M1207) system. Based on radiative transfer modelling of near-infrared to submillimetre data, we estimate a disc mass of 3 ± 2 MJup and an outer disc radius of 50-100 au for the 2M1207A disc. The relative disc mass for 2M1207A is similar to the T Tauri star TW Hya, whi…
The extra red plutino (55638) 2002 VE95
Barucci, M. A.; Fornasier, S.; Dotto, E. +7 more
Aims: In the framework of a large program, we observed (55638) 2002 VE95 with the ESO-VLT telescope to better constrain its surface composition and to investigate the possible heterogeneity of the surface.
Methods: We report new near-infrared observations performed in 2007 and 2008. Using the new constraints of the albedo obta…
Study of Differences Between Sunspot and White Light Facular Area Data Determined from SDO/HMI and SOHO/MDI Observations
Győri, L.
Sunspot and white light facular areas are important data for solar activity and are used, for example, in the study of the evolution of sunspots and their effect on solar irradiance. Solar Dynamic Observatory's Helioseismic and Magnetic Imager (SDO/HMI) solar images have much higher resolution (∼0.5'' pixel−1) than Solar and Heliospheri…
Auroral streamers implication for the substorm progression on September 14, 2004
Frey, H. U.; Kubyshkina, M. V.; Fu, S. Y. +9 more
Magnetospheric substorms manifest a fundamental disturbance in geospace. Understanding of substorm progression is essential for solar terrestrial physics and space weather research. The auroral streamer and the bursty bulk flows (BBFs) were simultaneously observed by the IMAGE/WIC and the Cluster in the midtail (X∼-16RE), whose footprin…
Solar and interplanetary parameters of CMEs with and without type II radio bursts
Moon, Y. -J.; Shanmugaraju, A.; Umapathy, S. +1 more
We have analyzed 101 CMEs, and their associated ICMEs and interplanetary (IP) shocks observed during the period 1997-2005. The main aim of the present work is to study the interplanetary characteristics of metric and DH type II associated CMEs such as, shock strength, IP shock speed, ICME speed, stand off distance and transit time. Among these 101…
X-ray observations of INTEGRAL discovered cataclysmic variable IGR J17195-4100
Singh, K. P.; Girish, V.
We present the analysis of archival X-ray data obtained with the XMM-Newton and Suzaku for a new intermediate polar identified as a counterpart of an INTEGRAL discovered γ-ray source, IGR J17195-4100. We report a new period of 1053.7 ± 12.2 s in X-rays. A new binary orbital period of 3.52-0.80+1.43 h is strongly indicated in the power spectrum of …
Modeled O2 airglow distributions in the Martian atmosphere
González-Galindo, Francisco; Lefèvre, Franck; Melo, Stella M. L. +2 more
We use a three-dimensional atmospheric model to study the airglow emissions from molecular oxygen in the Martian atmosphere. We estimate the O2 Herzberg I & II, the Chamberlain, and the Infrared Atmospheric band emissions from different sets of kinetic parameters available in the literature. As expected, the enhanced production of a…
Interstellar reddening towards six small areas in Puppis-Vela
Franco, G. A. P.
Context. The line-of-sight towards Puppis-Vela contains some of the most interesting and elusive objects in the solar neighbourhood, including the Gum nebula, the IRAS Vela shell, the Vela SNR, and dozens of cometary globules.
Aims: We investigate the distribution of the interstellar dust towards six small volumes of the sky in the region of …
Application of a data-driven simulation method to the reconstruction of the coronal magnetic field
He, Han; Fan, Yu-Liang; Wang, Hua-Ning +1 more
Ever since the magnetohydrodynamic (MHD) method for extrapolation of the solar coronal magnetic field was first developed to study the dynamic evolution of twisted magnetic flux tubes, it has proven to be efficient in the reconstruction of the solar coronal magnetic field. A recent example is the so-called data-driven simulation method (DDSM), whi…