Gopal Hazra
@astrohazra.bsky.social
Astrophysicist, Assistant Professor @IITKanpur
Previously @University of Vienna, Leiden Observatory and Trinity College Dublin
Working on atmospheric escape, exoplanetary magnetic field, star-planet interaction & Sun
Web: https://gopalhazra.github.io/
Previously @University of Vienna, Leiden Observatory and Trinity College Dublin
Working on atmospheric escape, exoplanetary magnetic field, star-planet interaction & Sun
Web: https://gopalhazra.github.io/
😂
November 9, 2025 at 4:39 AM
😂
This would be us!!! Have you ever thought if the sunspots that we consider have morphological asymmetry and not spherical in nature, then how the polar field will change? We answer the question here :)
Improved reconstruction of the century-long solar magnetic field by incorporating morphological asymmetry in sunspots
https://arxiv.org/pdf/2509.23691
Subhadip Pal, Gopal Hazra, Sudip Mandal.
https://arxiv.org/pdf/2509.23691
Subhadip Pal, Gopal Hazra, Sudip Mandal.
https://arxiv.org/abs/2509.23691
arXiv abstract link
arxiv.org
September 30, 2025 at 8:06 AM
This would be us!!! Have you ever thought if the sunspots that we consider have morphological asymmetry and not spherical in nature, then how the polar field will change? We answer the question here :)
First time we have assimilated three decades of solar observations into a dynamo model to probe solar interior! Happy reading ☺️
Probing the large-scale magnetic field inside the Sun from three decades of observed surface magnetograms
https://arxiv.org/pdf/2509.23959
Soumyadeep Chatterjee, Gopal Hazra.
https://arxiv.org/pdf/2509.23959
Soumyadeep Chatterjee, Gopal Hazra.
https://arxiv.org/abs/2509.23959
arXiv abstract link
arxiv.org
September 30, 2025 at 7:49 AM
First time we have assimilated three decades of solar observations into a dynamo model to probe solar interior! Happy reading ☺️
Reposted by Gopal Hazra
The cost in APC for publishing a paper in MNRAS is now £2356. Converting that to dollars at current rates gives about $3150 per paper.
On that basis, @ojastro.bsky.social having now published 357 articles has saved the global astrophysics community about $1.1M (for an outlay of around $10K).
On that basis, @ojastro.bsky.social having now published 357 articles has saved the global astrophysics community about $1.1M (for an outlay of around $10K).
August 22, 2025 at 12:41 PM
The cost in APC for publishing a paper in MNRAS is now £2356. Converting that to dollars at current rates gives about $3150 per paper.
On that basis, @ojastro.bsky.social having now published 357 articles has saved the global astrophysics community about $1.1M (for an outlay of around $10K).
On that basis, @ojastro.bsky.social having now published 357 articles has saved the global astrophysics community about $1.1M (for an outlay of around $10K).
Just put the assignments and solutions of the computational physics course that I taught at IIT Kanpur:
github.com/gopalhazra/C...
Please feel free to download and play around
Happy coding :D
github.com/gopalhazra/C...
Please feel free to download and play around
Happy coding :D
GitHub - gopalhazra/Computational_Physics_Gopal_Hazra: Solved assignements including jupyter notebooks for learning computation physics
Solved assignements including jupyter notebooks for learning computation physics - gopalhazra/Computational_Physics_Gopal_Hazra
github.com
August 10, 2025 at 5:23 PM
Just put the assignments and solutions of the computational physics course that I taught at IIT Kanpur:
github.com/gopalhazra/C...
Please feel free to download and play around
Happy coding :D
github.com/gopalhazra/C...
Please feel free to download and play around
Happy coding :D
Reposted by Gopal Hazra
APPLICATIONS DUE IN ONE WEEK!
#exoplanets #jobs 📣
I'm advertising for a postdoc! Come work with me in sunny SoCal on the Roman Galactic Exoplanet Survey Project Infrastructure Team. You'll help build the pipeline for Roman* occurrence rates.
*Launches NEXT YEAR!
Please RT & share with your networks!
aas.org/jobregister/...
I'm advertising for a postdoc! Come work with me in sunny SoCal on the Roman Galactic Exoplanet Survey Project Infrastructure Team. You'll help build the pipeline for Roman* occurrence rates.
*Launches NEXT YEAR!
Please RT & share with your networks!
aas.org/jobregister/...
Postdoctoral Scholar - Roman Galactic Exoplanet Survey PIT | American Astronomical Society
IPAC, part of the Physics, Math, and Astronomy Division at Caltech, provides science operations, user support, data and archive services, and scientific vision to maximize discovery with observatories...
aas.org
July 25, 2025 at 4:42 PM
APPLICATIONS DUE IN ONE WEEK!
Reposted by Gopal Hazra
Abstracts close this Friday for the Fall 2025 STScI Science Workshop on Atmospheric Escape and Replenishment. We'd love to see you in Baltimore in November!
Check it out and let me know if you've any questions. 🔭 #exoplanets
www.stsci.edu/contents/eve...
Check it out and let me know if you've any questions. 🔭 #exoplanets
www.stsci.edu/contents/eve...
Atmospheric Escape and Replenishment in Planetary Systems Workshop
www.stsci.edu
July 14, 2025 at 4:38 PM
Abstracts close this Friday for the Fall 2025 STScI Science Workshop on Atmospheric Escape and Replenishment. We'd love to see you in Baltimore in November!
Check it out and let me know if you've any questions. 🔭 #exoplanets
www.stsci.edu/contents/eve...
Check it out and let me know if you've any questions. 🔭 #exoplanets
www.stsci.edu/contents/eve...
Reposted by Gopal Hazra
Presenting: the Olin Wilson Legacy Survey (OWLS). 🧪🔭 #stellarastro
Since 2019, Leslie Hebb, Suzanne Hawley and I have been monitoring spectra of bright northern stars including those monitored by Olin Wilson from ~1965-2000, and planet-hosting stars
And we're not done.
arxiv.org/abs/2507.07330
Since 2019, Leslie Hebb, Suzanne Hawley and I have been monitoring spectra of bright northern stars including those monitored by Olin Wilson from ~1965-2000, and planet-hosting stars
And we're not done.
arxiv.org/abs/2507.07330
July 11, 2025 at 10:48 AM
Presenting: the Olin Wilson Legacy Survey (OWLS). 🧪🔭 #stellarastro
Since 2019, Leslie Hebb, Suzanne Hawley and I have been monitoring spectra of bright northern stars including those monitored by Olin Wilson from ~1965-2000, and planet-hosting stars
And we're not done.
arxiv.org/abs/2507.07330
Since 2019, Leslie Hebb, Suzanne Hawley and I have been monitoring spectra of bright northern stars including those monitored by Olin Wilson from ~1965-2000, and planet-hosting stars
And we're not done.
arxiv.org/abs/2507.07330
Reposted by Gopal Hazra
High-resolution Ultraviolet-to-nearinfrared Characterization of Exoplanet Atmospheres. Patricio E. Cubillos et. al. https://arxiv.org/abs/2507.03060
![Cross-correlation signature of the ultra hot-Jupiter WASP-121b as a function of orbital phase and radial-velocity (RV) shift, collected from 8 ESPRESSO observing nights [0.38--0.78 µm,][]{PelletierEtal2025ajWASP121bCRIRESplus](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:32r7scd5hucgv552zjfuaigc/bafkreie2or2bojfcdhijikfssy5hgdi6vzz2qbe765djvtvykynqqbayei@jpeg)
July 8, 2025 at 3:53 AM
High-resolution Ultraviolet-to-nearinfrared Characterization of Exoplanet Atmospheres. Patricio E. Cubillos et. al. https://arxiv.org/abs/2507.03060
At Exomol conference!
Gopal Hazra ( IIT Kanpur): Constraining Atmospheric Evaporation Rate From Gas Giants by Simultaneous Modelling of Lyman-α, Hα and Helium Transit Spectra.
#Exoplanets
#AllTheWavelengths
#Exoplanets
#AllTheWavelengths
July 2, 2025 at 10:35 AM
At Exomol conference!
It was an excellent event! So much fun, woohoo!
Conference Quiz prizes (@ExoMol monsters) are going to the best team .... @astroyami.bsky.social, Patrice Cubb, Vatsal Panwar, @astrohazra.bsky.social, Elias Ehl with Alex Smola and Ryan Brady as Amazing Quiz Masters.
#AllTheWavelengths
#AllTheWavelengths
June 30, 2025 at 8:28 PM
It was an excellent event! So much fun, woohoo!
Reposted by Gopal Hazra
🔭If you work in stats you've probably heard of nested sampling: MCMCs fancy cousin. Enough people have asked me how it works that I've written an article (including examples!) explaining:
1. What NS is
2. Why we need it over MCMC
3. How to know if it's working
hughmcdougall.github.io/blog/03_stat...
1. What NS is
2. Why we need it over MCMC
3. How to know if it's working
hughmcdougall.github.io/blog/03_stat...
May 25, 2025 at 6:47 AM
🔭If you work in stats you've probably heard of nested sampling: MCMCs fancy cousin. Enough people have asked me how it works that I've written an article (including examples!) explaining:
1. What NS is
2. Why we need it over MCMC
3. How to know if it's working
hughmcdougall.github.io/blog/03_stat...
1. What NS is
2. Why we need it over MCMC
3. How to know if it's working
hughmcdougall.github.io/blog/03_stat...
My review article on "Atmospheric Escape from Exoplanets" is finally published in Reviews of Modern Plasma Physics. The full-text copy of the article is available in the following link:
rdcu.be/ek5aY
rdcu.be/ek5aY
May 9, 2025 at 11:48 AM
My review article on "Atmospheric Escape from Exoplanets" is finally published in Reviews of Modern Plasma Physics. The full-text copy of the article is available in the following link:
rdcu.be/ek5aY
rdcu.be/ek5aY
Reposted by Gopal Hazra
Last year, #ISRO 's solar probe #Adiyta-L1 witnessed a X6.3 #flare and captured 1st images from the #chromosphere. Published today by scientists led by #IUCAA and including #MPSGoettingen in #TheAstrophysicalJournalLetters. More here: www.mps.mpg.de/8324638/news... ☀️🔭
image credit: SUIT/Aditya-L1
image credit: SUIT/Aditya-L1
February 28, 2025 at 8:43 AM
Last year, #ISRO 's solar probe #Adiyta-L1 witnessed a X6.3 #flare and captured 1st images from the #chromosphere. Published today by scientists led by #IUCAA and including #MPSGoettingen in #TheAstrophysicalJournalLetters. More here: www.mps.mpg.de/8324638/news... ☀️🔭
image credit: SUIT/Aditya-L1
image credit: SUIT/Aditya-L1
I am excited to share that my review paper is in arXiv today. This paper gives the basics and overall progress of the field-atmospheric escape from exoplanets, in recent years. It will appear soon in the Reviews of Modern Plasma Physics.
arxiv.org/abs/2502.18124
arxiv.org/abs/2502.18124
February 26, 2025 at 5:07 AM
I am excited to share that my review paper is in arXiv today. This paper gives the basics and overall progress of the field-atmospheric escape from exoplanets, in recent years. It will appear soon in the Reviews of Modern Plasma Physics.
arxiv.org/abs/2502.18124
arxiv.org/abs/2502.18124
We are delighted to announce an exoplanet workshop at IIT Kanpur from 4-6th April 2025. Please share the word.
Deadline: 27th Feb 2025
For application: sites.google.com/view/exows25...
Deadline: 27th Feb 2025
For application: sites.google.com/view/exows25...
February 13, 2025 at 6:15 PM
We are delighted to announce an exoplanet workshop at IIT Kanpur from 4-6th April 2025. Please share the word.
Deadline: 27th Feb 2025
For application: sites.google.com/view/exows25...
Deadline: 27th Feb 2025
For application: sites.google.com/view/exows25...
Publication alert!
Our paper on the effect of Coronal Mass Ejections on planetary atmospheric loss and habitability is finally published in MNRAS @rasjournals.bsky.social
academic.oup.com/mnras/articl...
Our paper on the effect of Coronal Mass Ejections on planetary atmospheric loss and habitability is finally published in MNRAS @rasjournals.bsky.social
academic.oup.com/mnras/articl...
Magnetic interaction of stellar coronal mass ejections with close-in exoplanets: implication on planetary mass-loss and Ly α transits
ABSTRACT. Coronal mass ejections (CMEs) erupting from the host star are expected to affect the atmospheric erosion processes of planets. For planets with a
academic.oup.com
January 30, 2025 at 4:55 PM
Publication alert!
Our paper on the effect of Coronal Mass Ejections on planetary atmospheric loss and habitability is finally published in MNRAS @rasjournals.bsky.social
academic.oup.com/mnras/articl...
Our paper on the effect of Coronal Mass Ejections on planetary atmospheric loss and habitability is finally published in MNRAS @rasjournals.bsky.social
academic.oup.com/mnras/articl...
Summer internship opportunities at IIT Kanpur for masters and UG students to work in a research group. Check the following link
Masters students: www.iitk.ac.in/cce/SARIP/
UG students: surge.iitk.ac.in/dates.php
Masters students: www.iitk.ac.in/cce/SARIP/
UG students: surge.iitk.ac.in/dates.php
SURGE IIT Kanpur
surge.iitk.ac.in
January 30, 2025 at 4:51 PM
Summer internship opportunities at IIT Kanpur for masters and UG students to work in a research group. Check the following link
Masters students: www.iitk.ac.in/cce/SARIP/
UG students: surge.iitk.ac.in/dates.php
Masters students: www.iitk.ac.in/cce/SARIP/
UG students: surge.iitk.ac.in/dates.php