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Subhajit Sarkar

Dr Subhajit Sarkar

Lecturer
Astronomy Group
Astronomy Instrumentation Group
Cardiff Hub for Astrophysics Research and Technology

School of Physics and Astronomy

Email
SarkarS3@cardiff.ac.uk
Telephone
+44 29225 14790
Campuses
Queen's Buildings - North Building, Room N/2.20, 5 The Parade, Newport Road, Cardiff, CF24 3AA
Users
Available for postgraduate supervision

Overview

I'm a university lecturer and astrophysicist working in the field of extra-solar planets. I am involved in the development of new missions and observatories to characterise the atmospheres of exoplanets, in particular the ESA Ariel mission, as well as Twinkle and the NASA EXCITE mission.  I also am involved in cycle 1 and cycle 2 JWST exoplanet observations in collaboration with IoA Cambridge. I am interested in understanding atmospheric and planetary processes in temperate regime sub-Neptunes and gas giants, and how these relate to fundamental questions of planet formation and the diversity of the exoplanet population.  I am also interested in astrobiology, particularly the potential for biospheres in temperate sub-Neptunes and gas giants, how we may be able to determine the frequency of life-bearing worlds (the fL factor in the Drake Equation) and how exoplanetary observations might be able to constrain theories of the origin of life.

Publication

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2006

2005

2004

Articles

Conferences

Monographs

Thesis

Websites

Research

Research focus

  • Development of new exoplanet observatories and missions
    • Ariel: first large-scale spectroscopic survey of exoplanet atmospheres.
      • I developed original versions of ExoSim/ArielSim observation simulator and Ariel Data Reduction Pipeline (ADaRP).  I lead the Simulations Working Group and am involved in a number of other ground segment and science working groups.  I am involved in the development of the Ariel data pipeline. I am Co-I on the UKSA Cardiff Ariel grant.
    • EXCITE: first dedicated exoplanet phase-curve spectroscopy observatory and first balloon-borne exoplanet observatory
      •  NASA collaborator/co-investigator
    • Twinkle: innovative UK-led space telescope for exoplanet spectroscopy
      • Developed TwinkleSim simulator and contributed to performance estimations.  Now a member of the Twinkle Science Team helping to shape the mission goals and science.
  • Exoplanet atmospheric spectroscopy
    • Sub-Neptunes:
      • Co-I on JWST Cycle 1 GO program 2722:
        'Chemical Disequilibrium in a Temperate sub-Neptune'. Approx. 20 hours. We use NIRISS, NIRSpec and MIRI to obtain the transmission spectrum of the sub-Neptune K2-18 b from 0.6 to 12 microns.
      • Co-I on JWST Cycle 2 GO program 3557:
        'A JWST Search for Missing Methane'.  Approx. 70 hours.  We will use NIRISS, NIRSpec and MIRI to obtain transmission spectra for 4 sub-Neptune/Neptune-sized planets.
    • Temperate gas giants (with Luke Booth):
      • Developing modeling and observational approaches to characterise this poorly-understood exoplanet population.
      • Lead the Cool Gas Giant working group for Twinkle and shaping the target list to perform first ever spectroscopic survey of cool gas giants.
    • Hot Jupiters:
      • Developed JexoPipe pipeline for JWST and applied this to hot Jupiter spectra.
  • Astrobiology
    • DRAKE (Dedicated Research for Advancing Knowledge of Exobiology): a proposed space mission to find the frequency of life in the Galaxy using transit spectroscopy (see paper in MNRAS).
    • Biospheres in temperate sub-Neptunes and gas giants

Software developed

  • ExoSim, ExoSim_N, JexoSim (JWST simulator), TwinkleSim, ADaRP, JexoPipe

Teaching

Current undergraduate teaching

  • PX4245 / PXT145 Exoplanets and the Search for Life: Module Organiser
  • PX2140 Stars and Planets: Deputy Module Organiser

Previous undergraduate teaching

  • PX1127 Planet Earth: Module Organiser
  • PX2140 Stars and Planets: guest lecturer
  • PX1127 Planet Earth: Deputy Module Organiser
  • PX2134 Structured Programming: Lab supervisor
  • PX1125 Mathematical Practice for Physical Sciences: Marker
  • PX1222 Mathematical Methods for Physicists 2: Marker

Other

  • I supervise PhD, MPhys, MSc and BSc research projects (see supervision page)

Biography

Education

  • PhD, Astrophysics, Cardiff University
  • MSc (Distinction), Space Science, University College London
  • Diploma in Physics (Distinction), Open University
  • MA, Natural Sciences, Cambridge University
  • MB, BChir, Medicine, Cambridge University
  • Grad. Cert. Applied Sciences, Space Studies, University of South Australia
  • Space Studies Program, International Space University

Professional memberships

  • Fellow of the Royal Astronomical Society
  • Fellow of the Higher Education Academy

Academic positions

  • 2022- Present: Lecturer in Exoplanet Characterisation, School of Physics and Astronomy, Cardiff University
  • 2017-2021: Post-doctoral Research Associate, Cardiff University
  • 2013-2017: Post-graduate Research Student, Cardiff University
  • 2003-2005: Visiting Researcher, Space Medicine & Health Care Systems Office, NASA Johnson Space Center, Houston.
  • 2003-2005: Honorary Lecturer in Space Life Sciences, Dept. of Space & Climate Physics, University College London

Outreach and Media

  • BBC Radio Wales Science Cafe interview about the ARIEL space mission (April 2018).
  • Pythagorean Astronomy podcast interview about TESS, ARIEL and other exoplanet missions (April 2018).
  • Exoplanet talks for Cardiff AS Level Summer Programmes 2018/19.
  • Stargazing talk and telescope observing with Scouts (Spring 2019).
  • Online astronomy talk with Scouts (Winter 2020).
  • 'All About Space' magazine interview about Ariel mission ('Rise of the Exoplanet Hunter') (Jan 2021).
  • Twinkle mission YouTube video ('The Founding Members') (Aug 2021).
  • Pythagorean Astronomy podcast interview about JWST observing programme (Dec 2021).
  • Cardiff School of Physics & Astronomy YouTube video about JWST (Dec 2021).
  • BBC News Wales interview about exoplanets and JWST (July 2022).
  • Nature News and Views article on JWST (Feb 2023).
  • NASA/ESA Press release on JWST K2-18 b observation (Sep 2023)
  • BBC News interview ('Alien life in the Universe') (Sep 2023)
  • K2-18 b international interviews including: Le Parisien, Hindustan Times, News9Live (India), Kosmo magazine (Italy) (Sep/Oct 2023)
  • IoP Festival of Physics, keynote speaker ('Exoplanets and the Search for Life') (Nov 2023)
  • Astronomy on Tap (Cardiff) speaker (Nov 2023)

Committees and reviewing

  • I am the post-graduate admissions tutor for the Astronomy Group. 
  • I currently serve on the following school committees: a) Equality, diversity and inclusion (EDI), b) Environment and sustainability.
  • I am on the CHART-GEI Schools Engagement Project management team and the Astronomy Instrumentation Group management team.
  • I have previously served on the Ethics committee and MSc approval panel.
  • JWST TAC panel member for cycle 3
  • I have refereed publications for journals including MNRAS, PASP and Nature.

Supervisions

Current supervision

  • I am primary PhD supervisor for Luke Booth who is researching exoplanet atmospheres.
  • I am currently on the supervisory team as mentor for two PhD students.
  • I currently supervise the undergraduate projects "Missions to the planets" and "Exoplanet transmission spectroscopy"

Current supervision

Luke Booth

Luke Booth

PhD Student/Research Assistant

Past projects

  • Previous undergraduate and MSc projects include:  "Habitable exomoons", "Transmission spectroscopy of water", "Designing a telescope to observe Earth-like planet atmosphere", "Simulations for the Twinkle space mission", "Impact of star spots on exoplanet transmission spectroscopy"