Project Scientist

Keck Planet Finder

Combining large aperture and extreme precision, KPF will be a highly stabilized spectrograph at the 10m Keck-I telescope in Hawaii (scheduled 2021). As Project Scientist and Data Pipeline Lead for this next-generation instrument, I make sure that every design decision optimizes science output, and both hardware and software combine to produce maximum measurement precision for exoplanet discovery.

Gibson, Howard, Roy et al. 2018, SPIE
KPF Website

Core Team Member


The centerpiece of a NASA-NSF collaboration, NEID will be an extreme precision optical spectrograph on the 3.5m WIYN telescope in Arizona (scheduled 2019). As part of the core NEID team, I am co-leading Data Pipeline development, and responsible for many design trades flowing down from the RV error budget to all subsystems. We are currently assembling NEID in the laboratory.

Schwab et al. 2016, SPIE
Halverson, Terrien, Mahadevan, Roy et al. 2016, SPIE
NEID Website

Core Team Member

Habitable Zone Planet Finder

HPF is a newly commissioned precision near-infrared spectrograph on the 10m Hobby Eberly Telescope in Texas, already producing the best NIR RV precision ever achieved on sky (~1.5m/s). I co-led the design of a highly scrambled and agitated fiber feed, including the invention of a novel method of illumination homogenization (provisionally patented), and am co-leading the development and implementation of the data reduction pipeline.

Halverson & Roy et al. 2015, ApJ
Roy et al. 2014, SPIE
HPF Website

Team Member


PARAS is a high-precision optical spectrograph on a 1.2m telescope in Mt. Abu, India, operating since 2010. I wrote and maintain the automated PARAS data reduction pipeline, which is routinely used to achieve ~1 m/s precision on sky, and led to our discovery of India’s first exoplanet. On a new 2.5m robotic telescope and aiming at 50cm/s, PARAS-2 will be an excellent workhorse spectrograph in the TESS era (scheduled 2019). I will also lead the pipeline development for this instrument.

Roy et al. 2016, SPIE
Chakraborty, Roy et al. 2018, AJ
Chakraborty, Mahadevan, Roy et al. 2014, PASP
Times of India Article



An upcoming diffraction-limited NIR spectrograph for the Hale Telescope at Palomar Observatory, scheduled for 2019. Coupled to the PALM-3000 adaptive optics system, PARVI is aiming at <1m/s. I am advising the data analysis team.



The High Resolution Spectrograph on the 10m South African Large Telescope is an existing instrument that has great potential for TESS follow-up in the Southern Hemisphere. I am leading the RV precision and instrument stability measurement effort.