15 research outputs found
First spatial resolution of the stellar components of the interacting binary CH Cygni
We report the first resolved bispectrum speckle interferometry of the
symbiotic binary CH Cyg. The measured component separation,
mas, is consistent with the one derived from the known spectroscopic orbit and
distance. In particular, our result implies a total mass of the binary of
M_{\rm t}=M_{\rm g}+M_{\rm wd}=3.7^{+3.5}_{-1.7} \rm M_{\sun}, which is in
good agreement with the value M_{\rm t}=2.7^{+1.2}_{-0.6} \rm M_{\sun}
derived from the spectroscopic orbit solution for the red giant and
evolutionary contraints. We also show that the radio jets and the bipolar
outflow are not orthogonal to the orbital plane of the binary system.Comment: 5 pages, 4 figures, submitted to MNRA
First results of the Kourovka Planet Search: discovery of transiting exoplanet candidates in the first three target fields
We present the first results of our search for transiting exoplanet
candidates as part of the Kourovka Planet Search (KPS) project. The primary
objective of the project is to search for new hot Jupiters which transit their
host stars, mainly in the Galactic plane, in the magnitude range of 11 to
14 mag. Our observations were performed with the telescope of the MASTER
robotic network, installed at the Kourovka astronomical observatory of the Ural
Federal University (Russia), and the Rowe-Ackermann Schmidt Astrograph,
installed at the private Acton Sky Portal Observatory (USA). As test
observations, we observed three celestial fields of size deg
during the period from 2012 to 2015. As a result, we discovered four transiting
exoplanet candidates among the 39000 stars of the input catalogue. In this
paper, we provide the description of the project and analyse additional
photometric, spectral, and speckle interferometric observations of the
discovered transiting exoplanet candidates. Three of the four transiting
exoplanet candidates are most likely astrophysical false positives, while the
nature of the fourth (most promising) candidate remains to be ascertained.
Also, we propose an alternative observing strategy that could increase the
project's exoplanet haul.Comment: 11 pages, 16 figures; Accepted for publication in Monthly Notices of
the Royal Astronomical Society 201