The CAELUS Center responds to the need to coordinate the numerous profiles within the IUSS that deal with space observations, new space missions, Earth observations and monitoring, climate change, and sustainable development. The CAELUS Center acts as the natural point of reference for IUSS participation in the Doctorates of National Interest in Space Science and Technology (with administrative headquarters at the University of Trento) and Earth Observation (University of Rome “La Sapienza”).
Research activities will primarily aim to:
- carry out research projects, especially those funded through external grants;
- expand collaborations with other universities (particularly the Italian “Scuole Superiori”) and research institutions (INAF, ASI, INFN, ENEA, CNR, etc.);
- develop new or improved data-analysis techniques, with a particular focus on exploring public archives of astronomical data, also leveraging artificial intelligence methods;
- deepen our understanding of compact objects in the Galaxy and beyond, of electromagnetic and gravitational transients, and of the interstellar medium, including the planning of new ground- and space-based observations;
- investigate physical processes occurring under extreme density, temperature, and gravitational conditions, observable in astrophysical objects but not reproducible in laboratory environments;
- pursue innovative research based on the interactive digital replica of our planet, enabled by the effective integration of satellite observations, artificial intelligence, Earth system science, and modelling;
- contribute to the design and implementation of both ground-based and space-based astronomical instrumentation;
- design downstream applications derived from satellite technologies and data.
The main research activities are conducted through:
- the analysis of multi-wavelength data collected by both space-based and ground-based observatories for the study of Galactic and extragalactic compact objects, transient phenomena, and the interstellar medium;
- their interpretation and physical modelling, also relying on numerical simulations;
- the development of Earth Observation (or Remote Sensing) research based on electromagnetic-field theory and on the properties of radiation–matter interaction, integrating mathematical aspects (e.g., inverse problems and statistical inference), physico-chemical aspects (e.g., electromagnetism, microphysics, electromagnetic propagation and scattering), and technological components (instruments, sensors, and satellites).
Ongoing research projects:
High-Energy Astrophysics
The astrophysics group at Scuola IUSS specializes in multi-wavelength studies of Galactic and extragalactic compact objects (white dwarfs, neutron stars, and black holes) and high-energy transients. Research focuses on cutting-edge topics such as highly magnetized neutron stars (magnetars), ultra-luminous X-ray sources, fast radio bursts, gamma-ray bursts, and tidal disruption events.
Activities include the collection, analysis, and interpretation of data across the entire electromagnetic spectrum from both space- and ground-based facilities, as well as the development of data-mining algorithms. IUSS contributed to the discovery of more than 100 new pulsars in archival data from XMM-Newton, Chandra, and Swift, and developed software for the identification of X-ray transient sources in the XMM-Newton archive, leading—among other results—to the discovery of a supernova shock breakout previously missed in earlier analyses. A related line of research concerns astrophysical signals that are both spatially extended and rapidly variable. These extremely rare events (the first detection dates back to 2003) typically occur when short but intense X-ray bursts illuminate clouds of interstellar dust. The group also contributes to the development of next-generation instruments and observatories, including the space missions Athena and AXIS, and the ground-based facilities CTA, SKA, and Northern Cross. IUSS has contributed to this latter aspect through the EXTraS project, focusing on the search for new transient phenomena in the XMM-Newton catalogue.
Copernicus Evolution: Research Activities Supporting the Advancement of Copernicus Downstream Services
The project aims to develop a multi-sensor approach integrating remote-sensing data with in-situ observations, coordinated with satellite overpasses, across diverse environments to assess the vulnerability of natural and anthropogenic systems and related ecosystems. This is achieved through the mapping of Essential Climate Variables (ECVs)—particularly land cover and morphodynamics—and the analysis of their spatial and temporal relationships. The project includes the integrated development of methods for processing and analysing satellite and in-situ data. An integrated framework is proposed to enable the scientific exploitation of hyperspectral PRISMA data, in synergy with other satellite missions, for detailed land-cover mapping to assess ecosystem vulnerability and the protection of ecosystem services. These aspects are crucial for the preservation and management of environmental resources. The methodology involves innovative algorithms applicable to multispectral Sentinel and Landsat data, which will then be extended to PRISMA hyperspectral products. The approach is expected to enhance user engagement and support full data exploitation of the mission. The identification and mapping of ecosystem types, boundaries, discontinuities, and spatial patterns are essential steps in designing long-term sustainability and management strategies. The remote-sensing component aims to identify and characterize key indicators using multi-temporal datasets from multi- and hyperspectral sensors. A methodology for mapping and assessing ecosystem services from satellite-derived land-use/land-cover maps will be demonstrated in selected case studies such as the Mekong Delta. Vegetation indices derived from satellite data will not only delineate vegetation patterns but also serve as proxies for mapping and quantifying associated ecosystem services.
Other projects:
-SpecFor – Spectroscopic Detection of Forest Damage: Investigating new declines of Italian holm oak forests from the leaf to the landscape scale (PRIN)
-SubRISK+ - Enhancing our Understanding of Subsidence Risk Induced by Groundwater Exploitation Toward Sustainable Urban Development (PRIN call)
-COMEFAR – COordinated Multiwavelength Exploration of FAst Radio bursts (INAF)
-ANIMA – Astronomy with Natively Interpretable MAchine Learning (INAF)
-TULiP – Timing the Ultra-Luminous X-ray Pulsars (INAF)
-The Binary Pulsar 4U 0728-25 in the Context of Persistent BeXRBs (INAF)
-BLOSSOM – BLack hOleS Swift fOrMation (INAF)
-Untangling the Wires in the Behaviour of High-Mass X-ray Binaries (INAF)
-Italian Partnership SPACE IT UP!
-SEAWIND-Super-Eddington Accretion: Wind, Inflow, and Disk (PRIN)
Training and Education:
Educational Offering on Space Science, Astrophysics, and Earth Observation
For several years, IUSS has offered Ordinary Courses within the Science and Technology area on topics related to space, astrophysics, and the observation of Earth and its changes. Among the courses currently active or recently offered are: “The Search for Extraterrestrial Life” and “X-ray Astronomy: Instrumentation, Data Analysis, and Publication of Results” (Prof. Andrea Tiengo); “Astrochemistry” (Prof. Cristina Puzzarini, University of Bologna); “Space Missions for Earth Observation” (Prof. Andrea Taramelli); “Statistical Tools to Analyze Astronomical Data” (Dr. Mario Pasquato, INAF); “Radiative Processes in Astrophysics”, “High-energy Astrophysics”, and the seminar “Black Holes” (Prof. Paolo Esposito); and “How Stars Die” (Dr. Guglielmo Mastroserio). Together, these constitute a true educational pathway in space sciences, touching upon topics that are often not extensively covered in traditional university curricula. The CAELUS Center aims to serve as a natural coordinating structure linking these teaching activities with related areas—climate change, data analysis, and the philosophical and societal aspects of technological development—which are already part of the current educational offering and will further expand in the coming years.
Within the National PhD Program in Space Science and Technology, the following courses will also be offered: “Observing Space from Space” and “From Observation to Discovery: Data Analysis Using a Human Brain” (Prof. Tiengo), and “New Space Economy in Earth Observations” (Prof. Taramelli, also offered in the National PhD Program in Earth Observation).
National PhD Program in Space Science and Technology
Italy has a long-standing tradition in space science and technology and has developed a complete chain of activities linking university education, academic and industrial research, and technological innovation. Space activities represent an inherently multidisciplinary field requiring specialized training. The National PhD Program in Space Science and Technology aims to train young researchers in science, engineering, technology, and international relations in the space sector by fostering the acquisition and development of knowledge, skills, and competencies across the research areas of the 27 participating universities and research institutions. The educational themes related to space activities span multiple domains, making the National PhD Program’s approach particularly effective. This structure allows for the sharing of lectures, training modules, laboratory experiences, and internship opportunities offered by numerous national and international institutions—ensuring excellence in content, the development of solid professional networks, and a high degree of personalization in individual training profiles. The educational offering consists of advanced courses delivered remotely during the first two years. Research activities related to the doctoral dissertation are carried out over three years at the host institution providing the scholarship, including mandatory research stays of at least six months in another Italian institution and at least six months abroad. The research plan is developed with the Curriculum Advisor and approved by the Academic Board. The final dissertation must present original and innovative scientific content. By the end of the program, candidates must demonstrate autonomy in conducting research and the ability to effectively communicate methods and results to an international audience, both orally and in writing. The doctoral program promotes an exploratory and interdisciplinary approach, fostering knowledge transfer to applied contexts and strengthening the link between fundamental and applied research in environmentally relevant fields that require innovative technologies, methods, and solutions. Candidates are also trained in research project design, proposal writing, and project management in national and international settings.
The PhD program includes the following eight curricula:
- Observation of the Universe
- Earth and the Sun–Earth System
- Planetary Sciences
- Astrobiology, Life Sciences and Space Medicine
- Space Sensing and Instrumentation
- Satellite Platform Engineering and Technologies
- Space Economy, Law and Diplomacy
- Gravitational Waves and Gravitation
National PhD Program in Earth Observation
The integrated use of Earth Observation (EO), Geomatics and Geoinformation (GGI), and Information and Communication Technologies (ICT) has long been recognized as essential for global and continuous monitoring of our planet. This integration is crucial for environmental knowledge and protection, territorial security and sustainable development, resource and production management, population safety, and overall quality of life. A large portion of the ~250 indicators used to measure progress toward the United Nations Sustainable Development Goals (SDGs) is based on information derived from the integration of EO, GGI, and ICT—an approach central to the activities of the UN initiative on Global Geospatial Information Management (UN-GGIM). Within this context, the Copernicus program—coordinated by the European Commission in cooperation with Member States, ESA, the European Environment Agency, and other organizations—plays a key role. Copernicus provides not only free and open EO and in-situ data but, crucially, user-driven services designed to meet the needs of public authorities, organizations, and service providers. The primary objective of the National PhD Program in Earth Observation is therefore to train professionals with integrated and cross-disciplinary expertise in EO, GGI, and ICT, as well as with specific administrative, legal, and application-oriented competencies. These professionals will be able to enhance existing services and design new ones in close collaboration with current and potential end users. The program builds on the strong expertise already available in EO, GGI, and ICT within several Italian universities and public research institutions, complementing it with competencies from public authorities, publicly funded foundations, and industry partners. Integrated within the Copernicus Academy training framework, the program develops its educational and research activities across the following thematic areas:
- methodologies, technologies, and infrastructures for the acquisition, analysis, and management of EO and geospatial data;
- identification, analysis, and management of natural and anthropogenic risks;
- crisis and emergency analysis and management;
- water cycle and cryosphere, marine and coastal environment;
- urban environment planning and management;
- agriculture, forestry, and environmental soil management;
- atmosphere, climate, and climate change;
- cultural heritage and landscape;
- legal and economic aspects of EO and geospatial data management;
- data mining.
Strengthening Collaboration Among the Italian High Schools
Collaboration has already intensified with the establishment of the new National PhD Programs, which also involve SISSA, GSSI, and SSSA. Further partnerships will be pursued to enhance synergies among the Scuole, produce high-quality research, and obtain external funding through joint project proposals.
Based on these premises, a joint research group is expected to be developed for the study of the Earth system and sustainable development, in collaboration with 3CSA and with strong interaction with the Center itself. This initiative aims to create a unique national center of excellence in interdisciplinary research and training, involving SSSA, IUSS, and GSSI.
Outreach and Promotion of the Center’s Research Activities at the National and International Level
To promote and consolidate the role of the Center and of the National PhD Programs within the national and international research and education landscape, regular organization of seminars, workshops, and summer schools on the Center’s themes is planned. The visibility offered by future scientific discoveries—similar to past ones that generated dozens of international press releases from agencies such as NASA, ESA, and JAXA—will also be leveraged to strengthen outreach efforts through multimedia platforms and social media.
Head: Prof. Paolo Esposito
Research staff:
Prof. Andrea Taramelli
Prof. Andrea Tiengo
Prof. Marco Gaetani
Prof. Christian Salvatore
Prof.ssa Giorgia Fosser
Dott.ssa Roberta Bonì
Dott.ssa Serena Farina
Dott. Guglielmo Mastroserio
Dott. Alberto Bonollo
Dott.ssa Beatrice Vaia
Dott. Andrea Geminardi
Dott. Aymeric Ferec
Dott.ssa Ilaria Fornasiero
Dott.ssa Dana Conzato
Dott.ssa Apostolica Karamali
Dott.ssa Chiara Marinelli
National collaborations
Istituto Nazionale di Astrofisica (INAF)
Università di Trento
Consiglio Nazionale delle Ricerche (CNR)
ISPRA
Università degli Studi Roma Tre
Università degli Studi di Padova
Università di Pisa
Universita' Degli Studi Di Roma “La Sapienza”
International collaborations
Instituto de Astrofísica de Canarias, Spain
SRON Netherlands - Institute for Space Research, The Netherlands
University of Malta, Malta
Rhodes University, South Africa
Institute of Space Sciences of the Spanish National Research Council - Institut d’Estudis Espacials de Catalunya
- Schiavon, E., Taramelli, A., Tornato, A., Lee, C. M., Luvall, J. C., Schollaert Uz, S., et al. (2023) Maximizing Societal Benefit Across Multiple Hyperspectral Earth Observation Missions: A User Needs Approach Journal of Geophysical Research (biogeosciences), 128(12), e2023JG007569, Wiley. https://doi.org/10.1029/2023JG007569
- Valentini, E., Taramelli, A., Marinelli, C., Martin, L. P., Fassari, M., Troffa, S., et al. (2023) Hyperspectral Mixture Models in the CHIME Mission Implementation for Topsoil Texture Retrieval Journal of Geophysical Research (biogeosciences), 128(9), e2022JG007272, Wiley. https://doi.org/10.1029/2022JG007272
- Tiengo, A., Pintore, F., Vaia, B., Filippi, S., Sacchi, A., Esposito, P., et al. (2023) The Power of the Rings: The GRB 221009A Soft X-Ray Emission from Its Dust-scattering Halo The Astrophysical Journal, 946(1), L30, IOP. https://doi.org/10.3847/2041-8213/acc1dc
- Mereghetti, S., Rigoselli, M., Salvaterra, R., Pacholski, D. P., Rodi, J. C., Gotz, D., et al. (2024) A magnetar giant flare in the nearby starburst galaxy M82 Nature, 629(8010), 58–61. https://doi.org/10.1038/s41586-024-07285-4
- Sathyaprakash, R., Rea, N., Coti Zelati, F., Borghese, A., Pilia, M., Trudu, M., et al. (2024) Long-term Study of the 2020 Magnetar-like Outburst of the Young Pulsar PSR J1846-0258 in Kes 75 The Astrophysical Journal, 976(1), 56, IOP. https://doi.org/10.3847/1538-4357/ad8226
Publications are available at the following links:
- Prof. Paolo Esposito: page of the IRIS archive
Prof. Andrea Taramelli: page of the IRIS archive
To request information on technical or scientific matters related to the CAELUS Center, please address all correspondence to the Director of the Center: Prof. Paolo Esposito, paolo.esposito@iusspavia.it
Bachelor's and master's thesis projects are available at the following link