Welcome to my WebPage.

I am an astronomer working at the Osservatorio Astrofisico di Arcetri, in Italy. I study relativistic magneto-hydrodynamics, relativistic winds, compact objects like Pulsars, and Neutron Stars, and X-rays. I am involved in the development of numerical algorithms for the study of fluids in Special and General Relativity, and for the modelling of magnetized Neutron Stars.
I also teach the High Energy Astrophysics class at the University of Firenze. Finally, I am in charge of the Outreach program of my Institute.

My Asteroid

The Asteroid 235999 has been named "Bucciantini" after me. My thanks to the "Gruppo Astrofili Montagna Pistoiese" for this great gift. It sits somewhere between Mars and Jupiter (search for 235999).


A PostDoc Abroad

In recent years, a small but steadily increasing number of funding programs have been put in place to help postdocs pursue their own research projects while remaining in someone else's lab. One such program--the Hubble Fellowships offered by NASA--has given Italian astronomer Niccolò Bucciantini unprecedented independence......


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«NON MI SONO mai sentito un cervello in fuga». Parola di Niccolò Bucciantini, astrofisico, 38 anni, aglianese trasferito a San Casciano Val di Pesa, ricercatore permanente all’osservatorio fiorentino di Arcetri dopo avere svolto progetti di ricerca negli Usa e in Svezia e tenuto conferenze in tutto il mondo. A 23 anni laurea in fisica ....


Simultaneous space and phase resolved X-ray polarimetry of the Crab pulsar and nebula

The Crab pulsar and its nebula are among the most studied astrophysical systems, and constitute one of the most promising environments where high-energy processes and particle acceleration can be investigated. They are the only objects for which significant X-ray polarization was detected in the past. Here we present the Imaging X-ray Polarimetry Explorer (IXPE) observation of the Crab pulsar and nebula. The total pulsar pulsed emission in the [2-8] keV energy range is unpolarized. Significant polarization up to 15% is detected in the core of the main peak. .... [...]

Bucciantini N. et al. 2023, Nature Astronomy, 7, 602

Polarisation leakage due to errors in track reconstruction in gas pixel detectors

X-ray polarimetry based on gas pixel detectors (GPDs) has reached a high level of maturity thanks to the Imaging X-ray Polarimeter Explorer (IXPE) providing the first-ever spatially resolved polarimetric measurements. However, as this a new technique, a few unexpected effects have emerged in the course of in-flight operations. In particular, it was almost immediately found that, the unpolarized calibration sources on-board were showing radially polarized halos. The origin of these features was recognized in a correlation ..... [...]

Bucciantini N. et al. 2023, A&A, 672, A66

Formation and evaporation of strangelets during the merger of two compact stars

We study the partial fragmentation of a strange quark star into strangelets during the process of merger of two strange quark stars. We discuss the fate of the fragments considering their possible evaporation into nucleons. We show that only a rather small amount of large size strangelets, ejected from the spiral arms in the post-merger, survives a total evaporation into nucleons. In this way we demonstrate that: 1) the density of strangelets in the galaxy is too low to trigger the conversion of all neutron stars into strange quark stars ...... [...]

N. Bucciantini et al., 2022, PRD, 106, 103032