A new era is expected to arrive around 2030 with a pool of exoplanets amounting to about ten thousand, including mainly small to medium-sized planets, and over a hundred habitable terrestrial rocky planets, thanks to the space-borne transit surveys by the Kepler, TESS and PLATO missions, and ground-based transit and radial-velocity (RV) surveys. The exoplanet community has proposed various missions for detailed characterization of the terrestrial planets, but it is quite technique-demanding and time-consuming especially for those with wide orbits. The currently proposed ESA mission ARIEL is a first step for this purpose, and it is powerful for the characterizations of planets down to warm super-Earths. The NASA HabEx and LUVOIR missions are mega projects to further tackle down to habitable rocky planets, and will be in operation after 2035 if approved. In the meanwhile, China is funding a concept study of a 4-6m space telescope named HABITATS ( HABItable Terrestrial planetary ATmospheric Surveyor). HABITATS will be dedicated for the characterization of habitable rocky planets around nearby stars, which aims to start its operation within the next 10-15 years and last for 5+ years. We describe briefly the preliminary concept study of this mission and propose a baseline telescope and instrument parameter values based on our simulation results. International collaborations from various institutes and research groups are welcome to join this ambitious effort in the aspects of science, instrumentation, platform, funding resources.
The Manfred Hirt Planet Spectrograph - formerly operated under the name FOCES - started its regular scientific observation program in fall 2019 at the 2m telescope of the Wendelstein Observatory, operated by the University Observatory of the LMU Munich. We present the first radial velocity stability measurements of an astronomical target, the 51 Pegasi b exoplanet system, utilizing our Astro Frequency Comb (ACF) for wavelength calibration. For computing RV shifts from orderwisely extracted Echelle spectra we have developed a new software pipeline. In this proceeding we will introduce the most important features of our pipeline: wavelength calibration with simultaneously recorded spectra of the AFC, generation of spectral templates, and an optional fit or cross- correlation function (CCF) for the calculation of the relative RV signals. Finally, the performance of the pipeline real data is demonstrated.
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