Graduate School in Physics and Astrophysics ------------------------------------------- ANNUAL REPORT ------------------------------------------- name: Domenico Barbato email: dome.barbato@gmail.com ciclo: XXXII year completed (1,2 or 3): 2 supervisor: Alessandro Sozzetti ------------------------------------------- GRADUATE SCHOOL COURSES (only completed courses, with examination passed in the year) code: 16 title: Chemo-dynamical evolution of the Milky Way teacher: Alessandro Spagna hours: 12 ------------------------------------------- CONFERENCES, WORKSHOP (only those attended in the current year) title: 11th GAPS Progress Meeting place: Milano, Italia webpage: https://indico.ict.inaf.it/event/547/ days: 3 talk or poster (Y/N): Y (talk) title: 12th GAPS Progress Meeting place: Cagliari, Italia webpage: https://indico.ict.inaf.it/event/684/ days: 3 talk or poster (Y/N): Y (talk) title: Gaia Day place: Roma, Italia webpage: https://www.asi.it/it/eventi/convegni/gaia-day days: 1 talk or poster (Y/N): N title: Exoplanets II place: Cambridge, UK webpage: https://www.exoplanetscience2.org/ days: 5 talk or poster (Y/N): Y (talk) title: Sagan Workshop place: Pasadena (CA), USA webpage: http://nexsci.caltech.edu/workshop/2018/ days: 5 talk or poster (Y/N): Y (talk and poster) title: XXXth General Assembly of the International Astronomical Union place: Vienna, Austria webpage: https://astronomy2018.univie.ac.at/home/ days: 5 talk or poster (Y/N): Y (talk) ------------------------------------------- VISITS AND STAGES (only those done in the current year) institution: Observatorio del Roque de los Muchachos place: La Palma, Spagna starting date: 14/09/2018 days: 7 --------------------------------------------------- Research activity/Publications in the current year (max characters 2500) In the second year of my PhD I published a paper as first-author in A&A, volume 615 based on my main research activities during the first year. In this paper 20 known planetary systems composed of a long-period giant planet have been studied with the help of new high-precision and densely sampled radial velocity collected with HARPS in order to search for additional lower-mass planets on inner orbits and assess the occurrence rate of systems reproducing the architecture of our Solar System on a smaller scale. It is also noteworthy that 13 of these known giant planets are estimated to produce an astrometrical signal that is in principle detectable by Gaia. To expand the search sample and obtain a higher number of high-precision radial velocity measurements, I wrote and submitted an ESO Large Programme proposal for Observing Periods P103 to P106. Another first-author paper, in which two new giant planets around metal-poor stars are announced and a preliminary update on the estimate of the giant planet occurrence rate as a function of stellar metallicity, has been submitted to A&A and is currently under review and if published will be the XVIII paper of the series “The GAPS programme with HARPS-N at TNG”. One of the announced planets shows an ambiguity in orbital period that needs to be resolved with either future Radial velocity measurements or with astrometrical analysis provided by Gaia. A first-author work assessing an updated value of the frequency of Earth-sized planets orbiting within the habitable zone of Solar type stars in the Kepler field using refined stellar parameters from the Gaia Data Release 2 has been presented at the XXXth General Assembly of the International Astronomical Union and will be published in the congress Proceedings. An important part of my thesis project has been started and is focused on the assessment of the difference in proper motion of known planet-hosting stars between Gaia DR2 and historical lower-accuracy astrometric catalog; this variation is an important element in updating the stellar and planetary components of the analysed systems. Finally, I spent five nights at Telescopio Nazionale Galileo in La Palma as co-Observer during a shared GAPS and GTO run. D. Barbato, A. Sozzetti, S. Desidera, M. Damasso, A. S. Bonomo, P. Giacobbe, L. S. Colombo, C. Lazzoni, R. Claudi, R. Gratton, G. LoCurto, F. Marzari and C. Mordasini, "Exploring the realm of scaled solar system analogues with HARPS", Astronomy & Astrophysics, 615, A175