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New observations and transit solutions of the inflated exoplanets HAT-P-40b and HAT-P-51b
Popov, Velimir A.; Petrov, Nikola I.; Kjurkchieva, Diana P.
We present high-precision photometric observations of the transiting exoplanets HAT-P-40b and HAT-P-51b by the Rozhen 2-m telescope. The newly-observed transit of HAT-P-40b is the first one with a complete curve. The orbital periods of the two targets were improved. We modeled the observed transits and found bigger stellar radii than those derived…
New insight into the formation mechanism of the energetic particle reservoirs in the heliosphere
He, H. -Q.
The concept of energetic particle reservoirs, essentially based on the assumption of the presence of outer reflecting boundaries/magnetic mirrors or diffusion barriers (deterministic) rather than on the effect of particle diffusive propagation (stochastic) in magnetic turbulence, has been used for decades to describe the space-extended decay phase…
GSC 03588-09315 is a low-amplitude delta Scuti variable
Boyd, D.; Walker, G.; Lloyd, Ch. +3 more
Time-series observations of GSC 03588-09315 show it is a very low amplitude, multiperiodic delta Scuti variable at the limit of detectability. Five frequencies have been identified at 13.86819(24), 8.10026(79), 5.01966(79), 11.67281(55) and 8.17490(59) c/d with amplitudes of 10, 5, 5, 4, and 3 mmag respectively. The spectral energy distribution of…
Quantitative Assessment of Protons During the Solar Proton Events of September 2017
Pandya, Megha; Bhaskara, Veenadhari
We present multi-spacecraft observations of the proton fluxes spanning from 1.5 to 433 MeV for the largest solar proton event of solar cycle 24, i.e., September 7 and 10, 2017. In September 2017, M5.5 flare on September 4, X9.3 flare on September 6 and X8.2 flare on September 10 gave rise to solar proton event when observed by near-Earth spacecraf…
The curvature emission model of peculiar isolated neutron star 2XMM J104608.7-594306
Chkheidze, N.; Machabeli, G.; Kevlishvili, N.
In the present paper we construct non-thermal emission theory, interpreting the observational properties of a newly discovered pulsar 2XMM J104608.7-594306 in X-rays that is believed to be thermally emitting isolated neutron star. A different approach of curvature emission scenario is considered, giving the spectral energy distribution that is in …
Properties of Stellar Populations of Eight Galactic Global Clusters with Low Central Surface Brightness
Sharina, M. E.; Maricheva, M. I.
This paper presents the results of the analysis of the integrated-light spectra of eight Galactic globular clusters with a relatively low luminosity and stellar density: Palomar 1, Palomar 2, Palomar 10, Palomar 13, Palomar 14, NGC 6426, NGC 6535, and NGC 6749. The absorption spectral indices in the Lick system were measured in their spectra, as w…
The BepiColombo Mission to Explore Mercury — Status Update and First Results from Science Activities During Cruise
Benkhoff, J.
In April 2020 BepiColombo has passed Earth and on 15th October 2020 Venus. The next planetary flybys will be at Venus and at Mercury in 2020. A status of the mission and a summary of first results will be given.
Titan's "Average" Ionospheric Structures from Cassini
Ip, Wing-Huen; Hsu, Jen-Kai
The decadal observations of Titan's neutral atmosphere and ionosphere by the Ion and Neutral Mass Spectrometer mass spectrometer and other instruments on board the Cassini spacecraft at the Saturnian system provide a precious data set concerning the large-scale structure of Titan's upper ionosphere. An attempt is made in this study to generate ave…
How to Get Water on the Moon
Kohler, Susanna
Given plans for future manned missions to the Moon and interest in the potential for longer-term lunar habitation the presence of water on the Moon is of critical importance. Studies over the last few decades have revealed water lurking on our satellite in numerous forms. But how does it get there?Water In, Water OutOverview of the lunar OH/H2 abu…
Dark X-Ray Galaxies in the A1367 Galaxy Cluster
Henriksen, Mark J.; Dusek, Scott
We have characterized a sample of extended X-ray sources in the A1367 galaxy cluster that lack optical counterparts. The sources are galaxy size and have an average total mass of 1.3 × 1011 solar masses. The average hot gas mass is 3.0 × 109 solar masses and the average X-ray luminosity is 4.3 × 1041 erg cm-2<…