Another Shipment of Six Short-Period Giant Planets from TESS

We present the discovery and characterization of six short-period, transiting giant planets from NASA's Transiting Exoplanet Survey Satellite (TESS) -- TOI-1811 (TIC 376524552), TOI-2025 (TIC 394050135), TOI-2145 (TIC 88992642), TOI-2152 (TIC 395393265), TOI-2154 (TIC 428787891), & TOI-2497 (TIC 97568467). All six planets orbit bright host stars (8.9 <G< 11.8, 7.7 <K< 10.1). Using a combination of time-series photometric and spectroscopic follow-up observations from the TESS Follow-up Observing Program (TFOP) Working Group, we have determined that the planets are Jovian-sized (R$_{P}$ = 1.00-1.45 R$_{J}$), have masses ranging from 0.92 to 5.35 M$_{J}$, and orbit F, G, and K stars (4753 $<$ T$_{eff}$ $<$ 7360 K). We detect a significant orbital eccentricity for the three longest-period systems in our sample: TOI-2025 b (P = 8.872 days, $e$ = $0.220\pm0.053$), TOI-2145 b (P = 10.261 days, $e$ = $0.182^{+0.039}_{-0.049}$), and TOI-2497 b (P = 10.656 days, $e$ = $0.196^{+0.059}_{-0.053}$). TOI-2145 b and TOI-2497 b both orbit subgiant host stars (3.8 $<$ $\log$ g $<$4.0), but these planets show no sign of inflation despite very high levels of irradiation. The lack of inflation may be explained by the high mass of the planets; $5.35^{+0.32}_{-0.35}$ M$_{\rm J}$ (TOI-2145 b) and $5.21\pm0.52$ M$_{\rm J}$ (TOI-2497 b). These six new discoveries contribute to the larger community effort to use {\it TESS} to create a magnitude-complete, self-consistent sample of giant planets with well-determined parameters for future detailed studies.Comment: 20 Pages, 6 Figures, 8 Tables, Accepted by MNRA

Lunar impact flashes: Results from 56 hours of video survey data observed by using one telescope

International audiencePrimarily observations are performed during 2013 and 2014 at AGM observatory of Marrakech by using one SC telescope in the aim of observing sporadic meteoroids impacting the lunar dark side. Here,we report results from 56 hours of video survey

Lunar impact flashes: Results from 56 hours of video survey data observed by using one telescope

International audiencePrimarily observations are performed during 2013 and 2014 at AGM observatory of Marrakech by using one SC telescope in the aim of observing sporadic meteoroids impacting the lunar dark side. Here,we report results from 56 hours of video survey

Monitoring of comets activity and composition with the TRAPPIST-North telescope

peer reviewedTRAPPIST-North (TRAnsiting Planets and PlanetesImals Small Telescope) is a 60-cm robotic telescope that was installed in May 2016 at the Oukaimeden Observatory. The project is led by the University of Liège (Belgium) and the Caddi Ayad University of Marrakech (Morocco). This telescope is a twin of the TRAPPIST-South telescope, which was installed at the ESO La Silla Observatory in 2010. The TRAPPIST telescopes are dedicated to the detection and characterization of planets orbiting stars other than our Sun (exoplanets) and the study of comets and other small bodies in our solar system. For the comets research, these telescopes have very sensitive CCD cameras with complete sets of narrow band filters to measure the production rates of several gases (OH, NH, CN, C3 and C2) and the dust. With TRAPPIST-North we can also observe comets that would not be visible in the southern hemisphere. Therfore, with these two telescopes, we can now observe continuously the comets around their orbit. We project to study individually the evolution of the activity, chemical composition, dust properties, and coma morphology of several comets per year and of different origins (New comets and Jupiter Family comets) over a wide range of heliocentric distances, and on both sides of perihelion. We measure the production rates of each daughter molecules using a Haser model, in addition to the Afρ parameter to estimate the dust production in the coma. In this work, we present the first measurements of the production rates of comet C/2013 X1 (PANSTARRS) observed with TN in June 2016, and the measurements of comet C/2013 V5 (Oukaimeden) observed in 2014 with TRAPPIST-South

Lunar impact flashes: Results from 56 hours of video survey data observed by using one telescope

International audiencePrimarily observations are performed during 2013 and 2014 at AGM observatory of Marrakech by using one SC telescope in the aim of observing sporadic meteoroids impacting the lunar dark side. Here,we report results from 56 hours of video survey

Joint observations of Lunar impact flashes

International audienceThe nature of lunar impact flashes has been discussed for more than 10 years and is still poorly known. In order to contribute to the understanding of these radiations, we developed joint observations of lunar flashes between Morocco and France and analysed here a compilation of flash observations

Joint observations of Lunar impact flashes

International audienceThe nature of lunar impact flashes has been discussed for more than 10 years and is still poorly known. In order to contribute to the understanding of these radiations, we developed joint observations of lunar flashes between Morocco and France and analysed here a compilation of flash observations

TRAPPIST monitoring of the activity and composition of the small near-Earth Jupiter Family Comets : 41P and 252P

We monitored 41P and 252P on both sides of perihelion with the TRAPPIST telescopes. The gas species production rates were computed as well as the Afrho parameter for both comets. Our results have shown that the two JFCs have a typical composition according to the Q(C2)/Q(CN) and Q(C3)/Q(CN) ratios but have a low gas and dust activity compared to other JFCs. We found that the activity of 41P is decreasing by about 30% to 40% from one apparition to the next. We confirmed rotation period derived from coma features slowed down by 20 hours in 2 months. 252P has shown an increase in production rates and dust production after perihelion which is believed to be associated with thermal processing of the nucleus surface