We present the first results with the ROentgen Survey with an Imaging Telescope Array
(eROSITA) on board the Russian Spektrum-Roentgen-Gamma mission, and we combine the …

Abstract PTFO 8-8695 (CVSO 30) is a star in the 7–10 million year old Orion OB1a cluster
that shows brightness dips that resemble planetary transits. Although strong evidence …

UX Orionis stars (UXors) are Herbig Ae/Be or T Tauri stars exhibiting sporadic occultation of
stellar light by circumstellar dust. GM Cephei is such a UXor in the young (∼ 4 Myr) open …

We present three-band simultaneous observations of a weak-line T-Tauri star, CVSO 30
(PTFO 8-8695), which is one of the youngest objects having a candidate transiting planet …

CVSO 30 is a young, active, weak-line T Tauri star; it possibly hosts the only known
planetary system with both a transiting hot-Jupiter and a cold-Jupiter candidate (CVSO 30 b …

We have initiated a dedicated project to follow-up with ground-based photometry the
transiting planets discovered by CoRoT in order to refine the orbital elements, constrain their …

Context. Direct imaging has developed into a very successful technique for the detection of
exoplanets in wide orbits, especially around young stars. Directly imaged planets can be …

Two methods have been developed to study secular (apsidal and nodal) orbital precession
in circumbinary systems consisting of a binary star and an exoplanet. The first method is …

Abstract PTFO 8-8695 b (CVSO 30 b) is a young planet candidate whose host star is a-Myr-
old T-Tauri star, and there have been continuous discussions about the nature of this …

The new analytical R-toroid method is applied to study the apsidal and nodal precession of
test orbits in the circumbinary exo-systems Kepler-16, Kepler-35, Kepler-38, Kepler-413 …