Dr. Aru Beri
Inspire Faculty, Physical Sciences

Email aruberi(AT)iisermohali.ac.in  
Phone  +91 172 2293105
Fax +91 172 2240266
Research Area:  High Energy Astrophysics/X-ray Astronomy, X-ray Binaries: Neutron Stars and Black holes

Research Focus:

I am an X-ray Astronomer and my research interests include the study of neutron stars and black holes in X-ray Binaries (XRBs). X-ray binaries are gravitationally bound systems consisting of a compact object (either a neutron star or a black hole) and usually a normal star as a companion, both rotating around a common center of mass. The compact object shines in X-rays due to gravitational energy released via mass transfer from the donor (accretion). The study of accretion flows around these systems is one of the very few ways to probe into the existence of curved space-time regions around the compact star (predictions of General Relativity). I use state of the art X-ray observations to probe these systems.

I am also involved in carrying out several multi-wavelength campaigns to study these objects in the sky. The main scientific goals of my research are: To unveil the accretion disk-Jet (outflow) coupling in XRBs, X-ray transients are often associated with fast periodic/quasi- periodic variability observed at different wavelengths. These dynamical time-scale variations are thought to be associated with orbital motions. However, it is not clear what is the mechanism responsible for both the periodic and quasi-periodic fast variability of XRBs? I also study wide range of neutron star X-ray binaries that include both high magnetic field (~10 12 Gauss) and low magnetic field (~10 7 -10 9 Gauss) neutron stars.
 Selected Publications
  • Beri, A., Jain, Chetana., Paul, Biswajit and Raichur, Harsha 2014, MNRAS 439, 1940: Torque Reversals and pulse profile of the pulsar 4U 1626–67
  • Beri, A., Paul, Biswajit and Dewangan, Gulab C 2015, MNRAS 451, 508-516: Pulse phase resolved spectroscopy of low energy emission lines of X-ray pulsar 4U 1626–67
  • Beri, A and Paul Biswajit 2017, New Astronomy Journal 56, 94-101: Postflare formation of the accretion stream and a dip in LMC X–4
  • Beri, A., Paul, Biswajit and Dewangan, Gulab. C 2018, MNRAS 475, 999-1009: Changes in the pulse phase dependence of X-ray emission lines in 4U 1626–67 with a torque reversal
  • Beri, A., Paul, Biswajit et al. 2018, MNRAS, 10.1093/mnras/sty2975: Thermonuclear X-ray bursts in rapid succession in 4U 1636-536 with AstroSat-LAXPC