Surendra Bhattarai

I am a crazy guy with a deep love to study the universe with the help of Gravitational Waves. Currently, I am a 4th year BS-MS student at IISER Kolkata, majoring in Physics. I intend to continue my research in the field of Gravitational Waves, General Relativity, and physics of Compact Objects.

CV is available on request.

Things I Can Do

Integer eu ante ornare amet commetus vestibulum blandit integer in curae ac faucibus integer non. Adipiscing cubilia elementum integer lorem ipsum dolor sit amet.

• Write all the code
• Stack small boxes
• Read books and stuff
• Drink much coffee
• Lightning bolt
• Shadow clone technique

Projects

Integer eu ante ornare amet commetus vestibulum blandit integer in curae ac faucibus integer non. Adipiscing cubilia elementum integer. Integer eu ante ornare amet commetus.

Summer intern (2022) at IUCAA.

Inter-University Centre for Astronomy and Astrophysics (IUCAA) Pune, India
July, 2022 - Present

Comparison between Eccentric GW signals & micro-lensed GW signals.

In this project, I got an exposure to work with PyCBC, which is a software package used to explore astrophysical sources of gravitational waves.

I studied about micro-lensing, which is basically frequency-dependent modulations in the Gravitational Wave (GW) signal caused by substructures in the form of stars and stellar remnants of the lensing galaxy.

Worked with TaylorF2Ecc waveform, which is a TaylorF2 post-Newtonian (PN) waveform model with eccentric corrections that incorporates the effects of eccentricity only in the phase and not in the amplitude.

Obtained a parameter space (y vs. M_lens) where the match between the eccentric and the micro-lensed waveform was significant.

Presentation link

IAstro Summer Internship (2022) at Instituto de Astrofísica e Ciências do Espaço (IA).

Porto, Portugal
July, 2022

Passive, but not resigned.

This was a remote internship where we studied about blue star forming galaxies and red passive galaxies where the star formation is quite low or even absent, and a new type of galaxies migrating from the blue star-forming cloud to the red passive zone.

The goal of this project was to compare the outcome from different selection methods applied to a very well-known field, COSMOS.

From the observations, we understood that finding a better selection method for identifying passive galaxies is important to make use of telescope time effectively.

Detecting exoplanets using Statistical Tools.

Apr 2022 - Present
This was a remote internship where we studied about blue star forming galaxies and red passive galaxies where the star formation is quite low or even absent, and a new type of galaxies migrating from the blue star-forming cloud to the red passive zone.

Radio Astronomy Winter School 2021.

Dec, 2021 - Jan, 2022
In this winter school, organised by NCRA-IUCAA, we analysed the effect of radio waves from WiFi signal in different experiments. We were also provided with data from Ooty radio telescope (ORT), where we detected pulse profile of the Vela pulsar. We also detected radio frequency interference (RFI) in GMRT data, and determined HI line parameters.
Report and presentation can be found here.

Classical Mechanics Semester Projects.

Aug - Dec, 2021

Project 1: Mathematical analysis of motion of a bead in a hoop and a charge moving in a static magnetic field. Report

Project 2: Dynamics of a rocket in a uniform gravitational field. Report

International Asteroid Search Campaign.

June - July, 2021
My team, consisting of me and 3 other members, discovered 1 main belt asteroid: 2021 LH10, by working as a Citizen Scientist in the International Asteroid Search Campaign organized jointly by the International Astronomical Search Collaboration (IASC), Hardin-Simmons University and NASA, where we used the data collected from Pan-STARRS and analyzed it using a software "Astrometrica".
More information can be found here.

Effect of AGN Accretion Discs on regulation of Star Formation.

Feb - Mar, 2021
Mentor: Sundar MN
Organised by SSERD (Society for Space Education Research and Development).

I examined AGN feedback mechanisms, studied various physical and characteristics that promote/inhibit star formation in galaxies such as viscosity, opacity, luminosity, magnetohydrodynamics, mass, pressure, fragmentation etc. and also worked on the far-infrared luminosity and the X-ray luminosity of AGNs via a semi-analytical model to investigate the trends of star formation against AGN accretion activity.
Report can be found here.

Publications

VaTEST I: Validation of Sub-Saturn Exoplanet TOI-181b in Narrow Orbit from its Host Star.

Preprint: https://doi.org/10.48550/arXiv.2211.07957

We have recently submitted this manuscript in MNRAS which is currently under 2nd review. This was an independent project undertaken by 5 students including me, where we detect exoplanets using statistical tools like VESPA, triceratops, lightkurve, etc.

Scholastic Acievements

• INSPIRE scholar
• All Assam Rank 18 in class 12.
• Anundoram Borooah Award.
• All Assam Rank 15 in class 10.