Search Publications
MEGANE investigations of Phobos and the Small Body Mapping Tool
Chabot, Nancy L.; Ernst, Carolyn M.; Nair, Hari +4 more
The MEGANE instrument onboard the MMX mission will acquire gamma-ray and neutron spectroscopy data of Phobos to determine the elemental composition of the martian moon and provide key constraints on its origin. To produce accurate compositional results, the irregular shape of Phobos and its proximity to Mars must be taken into account during the a…
Exotic image formation in strong gravitational lensing by clusters of galaxies - I. Cross-section
Meena, Ashish Kumar; Bagla, Jasjeet Singh
In a recent paper, we have discussed the higher order singularities in gravitational lensing. We have shown that a singularity map, comprising A3- lines and unstable (point) singularities (A4 and D4), is a compact representation of high magnification regions corresponding to a given lens model for all possible sour…
Orbits of 47 dwarf satellite galaxies of the Milky Way in three models of the gravitational potential with different masses
Bobylev, V. V.; Bajkova, A. T.
The analysis of the orbits of 47 dwarf satellite galaxies of the Milky Way, built using three models of the galactic gravitational potential with different masses, is presented. The models of the galactic potential were chosen based on the analysis of a large number of the Galaxy mass estimates known from the literature. The astrometric data neede…
Upper limits for phosphine (PH3) in the atmosphere of Mars
Patel, M. R.; Montmessin, F.; Irwin, P. G. J. +12 more
Phosphine (PH3) is proposed to be a possible biomarker in planetary atmospheres and has been claimed to have been observed in the atmosphere of Venus, sparking interest in the habitability of Venus's atmosphere. Observations of another biomarker, methane (CH4), have been reported several times in the atmosphere of Mars, hinti…
Near-IR Observations of the Young Star [BHB2007]-1: A Substellar Companion Opening the Gap in the Disk
Cleeves, L. Ilsedore; Garufi, Antonio; Zhu, Zhaohuan +5 more
The presence of planets or substellar objects still embedded in their native protoplanetary disks is indirectly suggested by disk substructures like gaps, cavities, and spirals. However, these companions are rarely detected. We present Very Large Telescope/NACO high-contrast images in the J, H, KS, and $L^{\prime} $ bands of the young s…
Multiwavelength analysis of the X-ray spur and southeast of the Large Magellanic Cloud
Haberl, F.; Filipović, M. D.; Kavanagh, P. J. +5 more
Aims: The giant H II region 30 Doradus (30 Dor) located in the eastern part of the Large Magellanic Cloud is one of the most active star-forming regions in the Local Group. Studies of H I data have revealed two large gas structures which must have collided with each other in the region around 30 Dor. In X-rays there is extended emission (~1 k…
Eta Carinae: A Tale of Two Periastron Passages
Hamaguchi, Kenji; Corcoran, Michael F.; Russell, Christopher M. P. +15 more
Since 2002, the far-ultraviolet (FUV) flux (1150-1680 Å) of Eta Carinae, monitored by the Hubble Space Telescope/Space Telescope Imaging Spectrograph, has increased by an order of magnitude. This increase is attributed to partial dissipation of a line-of-sight (LOS) occulter that blocks the central core of the system. Across the 2020 February peri…
Hyper Suprime-Cam Legacy Archive
Takita, Satoshi; Ikeda, Hiroyuki; Koike, Michitaro +5 more
We present the launch of the Hyper Suprime-Cam Legacy Archive (HSCLA), a public archive of processed, science-ready data from the Hyper Suprime-Cam (HSC). HSC is an optical wide-field imager installed at the prime focus of the Subaru Telescope and has been in operation since 2014. While ~1/3 of the total observing time of HSC has been used for the…
Sensitivity of solar wind mass flux to coronal temperature
Matteini, L.; Owen, C. J.; Baker, D. +4 more
Solar wind models predict that the mass flux carried away from the Sun in the solar wind should be extremely sensitive to the temperature in the corona, where the solar wind is accelerated. We perform a direct test of this prediction in coronal holes and active regions using a combination of in situ and remote sensing observations. For coronal hol…
Optical and NIR spectroscopy of cool CEMP stars to probe the nucleosynthesis in low-mass AGB binary system
Ojha, D. K.; Sivarani, T.; Ninan, J. P. +4 more
We present the abundance analyses of seven carbon enhanced metal-poor (CEMP) stars to understand the origin of carbon in them. We used high-resolution optical spectra to derive abundances of various elements. We also used low-resolution near-infrared (NIR) spectra to derive the abundance of O and 12C/13C from the CO molecular…