Niamh O’Sullivan
@niamhk12.bsky.social
DPhil student at the University of Oxford. A stellar physicist pretending to be an exoplanet finder 🌟🪐🌟
HARPS3 has definitely arrived at the INT (and I was only slightly excited to see it!) @terrahunting.bsky.social
October 29, 2025 at 6:21 PM
HARPS3 has definitely arrived at the INT (and I was only slightly excited to see it!) @terrahunting.bsky.social
I’ve made it to La Palma where I’ll be spending the next week observing with the TNG! Here are some mandatory photos of the observatory 🔭🌟💫
October 27, 2025 at 4:07 PM
I’ve made it to La Palma where I’ll be spending the next week observing with the TNG! Here are some mandatory photos of the observatory 🔭🌟💫
Sometimes the world is just beautiful
August 9, 2025 at 9:14 PM
Sometimes the world is just beautiful
Had a great time at #eprv6 this week! We had a splinter session on supergranulation that led to some great discussions! Thank you to everyone who came!
July 4, 2025 at 11:04 AM
Had a great time at #eprv6 this week! We had a splinter session on supergranulation that led to some great discussions! Thank you to everyone who came!
So how long does it take to detect and characterise the supergranulation signal? Using the Fisher information content we show that in 23 nights we can characterise the supergranulation timescale in 10 stars, if we switch randomly between stars every 5 minutes!
July 1, 2025 at 8:14 AM
So how long does it take to detect and characterise the supergranulation signal? Using the Fisher information content we show that in 23 nights we can characterise the supergranulation timescale in 10 stars, if we switch randomly between stars every 5 minutes!
We find that the supergranulation timescale is anti-correlated with the Sun’s activity cycle. When the Sun is at solar minimum, the supergranules have a larger timescale! This means that we can’t treat supergranulation as static over the timescales of long baseline RV surveys!
July 1, 2025 at 8:12 AM
We find that the supergranulation timescale is anti-correlated with the Sun’s activity cycle. When the Sun is at solar minimum, the supergranules have a larger timescale! This means that we can’t treat supergranulation as static over the timescales of long baseline RV surveys!
We look at the HARPS-N quiet Sun RVs, derived using both SDO data and YARARA. We model the range quiet Sun RVs with a GP kernel with 2 aperiodic SHO terms and a white noise term.
July 1, 2025 at 8:10 AM
We look at the HARPS-N quiet Sun RVs, derived using both SDO data and YARARA. We model the range quiet Sun RVs with a GP kernel with 2 aperiodic SHO terms and a white noise term.
Had a great time learning all about PLATO and the PLATO-ESP conference in Marseille this week!
June 27, 2025 at 3:39 PM
Had a great time learning all about PLATO and the PLATO-ESP conference in Marseille this week!
We had a great talk by @moudhy.bsky.social at @wolfsonoxford.bsky.social AstroClub this evening! Thank you so much to everyone who came along and especially to Moudhy for such a great talk!
May 28, 2025 at 8:44 PM
We had a great talk by @moudhy.bsky.social at @wolfsonoxford.bsky.social AstroClub this evening! Thank you so much to everyone who came along and especially to Moudhy for such a great talk!
Happy May Morning from Oxford 🌸 🌺🌻
May 1, 2025 at 12:46 PM
Happy May Morning from Oxford 🌸 🌺🌻
93 years old and an incredible speaker
April 23, 2025 at 2:56 PM
93 years old and an incredible speaker
Partial solar eclipse in the UK! Sharing my love of the Sun with my friends! ☀️🔭⭐️
March 29, 2025 at 11:47 AM
Partial solar eclipse in the UK! Sharing my love of the Sun with my friends! ☀️🔭⭐️
Very excited to have given a talk at #knowthystar2 yesterday on my work on characterising supergranulation in the Sun! If you’re around and want to discuss SG come find me I’d love to talk!
February 4, 2025 at 5:11 PM
Very excited to have given a talk at #knowthystar2 yesterday on my work on characterising supergranulation in the Sun! If you’re around and want to discuss SG come find me I’d love to talk!
Today’s research helper is Humbug, who is keeping my notebook warm for me while I’m in meetings 🔭🐈⬛!!
November 15, 2024 at 9:19 AM
Today’s research helper is Humbug, who is keeping my notebook warm for me while I’m in meetings 🔭🐈⬛!!
The clouds blessed us in Dallas ☀️ 🔭🪐Seeing a total eclipse as an astrophysicist was truly incredible (no tears were shed at all…) #totalsolareclipse
April 8, 2024 at 6:58 PM
The clouds blessed us in Dallas ☀️ 🔭🪐Seeing a total eclipse as an astrophysicist was truly incredible (no tears were shed at all…) #totalsolareclipse
Weather app says there aren’t any clouds, I disagree 🌥️. It might peak through though 🤞 #solareclipse 🔭☀️
April 8, 2024 at 3:52 PM
Weather app says there aren’t any clouds, I disagree 🌥️. It might peak through though 🤞 #solareclipse 🔭☀️
Last week I gave my first ever public talk at Wolfson College Oxford, talking about some famous astrophysicists who happen to be women. Thank you to everyone that came along 🛰️🪐🌟
November 6, 2023 at 7:55 PM
Last week I gave my first ever public talk at Wolfson College Oxford, talking about some famous astrophysicists who happen to be women. Thank you to everyone that came along 🛰️🪐🌟