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165 papers
A Unified Multi-Band Secular Framework for the Hierarchical Triple PSR J0435+3233 System
Achamveedu Gopakumar, Vidit Singh, Abhimanyu Susobhanan +9
The millisecond pulsar PSR J0435+3233, discovered by FAST, exhibits an unusually large apparent spin-down rate, potentially reflecting line-of-sight acceleration from a distant com…
The October 2022 flare in OJ 287 and the mass of its primary black hole
Mauri J. Valtonen, Staszek Zola, Manpreet Singh +21
The bright blazar OJ~287 has demonstrated a sequence of flares, which are well explained by a quasi-Keplerian orbit model. The flares are associated with the impact of the secondar…
Efficient time-domain eccentric model for Galactic binaries in LISA
Shubhanshu Tiwari, Johan O. A. Robertsson, A. Gopakumar +4
Galactic binaries are expected to be the most numerous long-lived sources in the Laser Interferometer Space Antenna (LISA) data stream and are commonly modeled as quasi-circular, n…
The Indian Pulsar Timing Array Data Release 2: III. Search for a Stochastic Gravitational Wave Background
Hemanga Tahbildar, Kunjal Vara, Mayuresh Surnis +28
We present the first independent search for an isotropic stochastic gravitational wave background in the second data release of the Indian Pulsar Timing Array, comprising of 27 mil…
Constraining Orbital Eccentricity of a Supermassive Black Hole Binary Candidate PKS 2131-0211
Avinash Kumar Paladi, A. Gopakumar, Sushmita Agarwal +1
A detailed analysis of the decades-long radio light curve of blazar PKS 2131-021 showed epochs of sinusoidal variations in the radio flux density time-series as detailed in O'Neill…
On the Presence of a Tertiary Compact Object in GW190814
Lalit Pathak, Hemantakumar Phurailatpam, Achamveedu Gopakumar
Gravitational waves from merging compact binaries are sensitive to line-of-sight acceleration (LOSA) induced by a massive companion in their vicinity. Interestingly, the leading-or…