Prerna Rana

Prerna Rana
Tata Institute of Fundamental Research | TIFR · Department of Astronomy and Astrophysics

Ph.D.

About

15
Publications
1,083
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53
Citations
Citations since 2016
15 Research Items
53 Citations
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Introduction
I am interested in classical special and general relativity, and pulsar astronomy. I am currently working on the study of nHz Gravitational-wave emission from supermassive black hole binary systems. I am also a member of the Indian Pulsar Timing Array (InPTA) (https://inpta.iitr.ac.in/ ) and contributing to their projects in the quest of discovering nHz Gravitational-waves. In my PhD thesis work, I worked on the study of bound trajectories in kerr spacetime and application to X-ray observations.

Publications

Publications (15)
Article
We present the pulse arrival times and high-precision dispersion measure estimates for 14 millisecond pulsars observed simultaneously in the 300 $-$ 500 MHz and 1260 $-$ 1460 MHz frequency bands using the upgraded Giant Metrewave Radio Telescope. The data spans over a baseline of 3.5 years (2018-2021), and is the first official data release made av...
Preprint
Full-text available
Decades long monitoring of millisecond pulsars, which exhibit highly stable rotational periods, in pulsar timing array experiments is on the threshold of discovering nanohertz stochastic gravitational wave background. This paper describes the Indian Pulsar timing array (InPTA) experiment, which employs the upgraded Giant Metrewave Radio Telescope (...
Preprint
Full-text available
We derive the conditions for a non-equatorial eccentric bound orbit to exist around a Kerr black hole in two-parameter spaces: the energy, angular momentum of the test particle, spin of the black hole, and Carter's constant space ($E$, $L$, $a$, $Q$), and eccentricity, inverse-latus rectum space ($e$, $\mu$, $a$, $Q$). These conditions distribute v...
Preprint
Full-text available
We study the bound orbit conditions for equatorial and eccentric orbits around a Kerr black hole both in the parameter space ($E$, $L$, $a$) representing the energy, angular momentum of the test particle, and spin of the black hole, and also ($e$, $\mu$, $a$) space representing the eccentricity, inverse-latus rectum of the orbit, and spin. We apply...
Preprint
Full-text available
We present the pulse arrival times and high-precision dispersion measure estimates for 14 millisecond pulsars observed simultaneously in the 300-500 MHz and 1260-1460 MHz frequency bands using the upgraded Giant Metrewave Radio Telescope (uGMRT). The data spans over a baseline of 3.5 years (2018-2021), and is the first official data release made av...
Article
Full-text available
PSR J1713+0747 is one of the most precisely timed pulsars in the international pulsar timing array experiment. This pulsar showed an abrupt profile shape change between April 16, 2021 (MJD 59320) and April 17, 2021 (MJD 59321). In this paper, we report the results from multi-frequency observations of this pulsar carried out with the upgraded Giant...
Preprint
Full-text available
PSR J1713+0747 is one of the most precisely timed pulsars in the international pulsar timing array experiment. This pulsar showed an abrupt profile shape change between April 16, 2021 (MJD 59320) and April 17, 2021 (MJD 59321). In this paper, we report the results from multi-frequency observations of this pulsar carried out with the upgraded Giant...
Article
Full-text available
We expand the relativistic precession model to include nonequatorial and eccentric trajectories and apply it to quasi-periodic oscillations (QPOs) in black hole X-ray binaries (BHXRBs) and associate their frequencies with the fundamental frequencies of the general case of nonequatorial (with Carter's constant, $Q\neq 0$) and eccentric ($e\neq 0$) p...
Article
Full-text available
We present a unified model for X-ray quasi-periodic oscillations (QPOs) seen in Narrow-line Seyfert 1 (NLSy1) galaxies, γ-ray and optical band QPOs that are seen in Blazars. The origin of these QPOs is attributed to the plasma motion in corona or jets of these AGN. In the case of X-ray QPOs, we applied the general relativistic precession model for...
Preprint
Full-text available
We present a unified model for X-ray quasi-periodic oscillations (QPOs) seen in Narrow-line Seyfert 1 (NLSy1) galaxies, $\gamma$-ray and optical band QPOs that are seen in Blazars. The origin of these QPOs is attributed to the plasma motion in corona or jets of these AGN. In the case of X-ray QPOs, we apply the general relativistic precession model...
Preprint
Full-text available
We expand the Relativistic Precession Model (RPM) to include non-equatorial and eccentric trajectories and apply it to Quasi-periodic oscillations (QPOs) in black hole X-ray binaries (BHXRB) and associate their frequencies with the fundamental frequencies of the general case of non-equatorial (with Carter's constant, $Q\neq 0$) and eccentric ($e\ne...
Article
Full-text available
We derive alternate and new closed-form analytic solutions for the nonequatorial eccentric bound trajectories, {φ (r, θ) , t (r, θ) , r (θ)}, around a Kerr black hole by using the transformation 1/r = ϵ (1 + e cos χ). The application of the solutions is straightforward and numerically fast. We obtain and implement translation relations between the...
Preprint
Full-text available
We derive alternate and new closed-form analytic solutions for the non-equatorial eccentric bound trajectories, $\{ \phi \left( r, \theta \right)$, $\ t \left( r, \theta \right),\ r \left( \theta \right) \}$, around a Kerr black hole by using the transformation $1/r=\mu \left(1+ e \cos \chi \right)$. The application of the solutions is straightforw...

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Projects

Projects (3)
Project
Analytic solutions of the general non-equatorial case, separatrix, spherical and equatorial trajectories, kinematic frequencies, application to QPOs in XRBs and binary black holes.
Project
Variability and QPOs in AGN