Bibiana Prinoth @bibianaprinoth.ch · 26/06/2026... the hottest planets still seem globally depleted in titanium relative to iron! Those inversion models reproduce the observed population trend surprisingly well, but there is no need to invoke increasingly stronger depletion toward cooler planets. See for yourself! 17/n 100
Bibiana Prinoth @bibianaprinoth.ch · 26/06/2026But can we reproduce this trend with models, you ask? We did too. We performed a large suite of model injections. We used simple isothermal atmosphere models, and models containing temperature inversions that make the deeper atmosphere cold enough for TiO to condense (we call them gradient). 13/n 100
Bibiana Prinoth @bibianaprinoth.ch · 26/06/2026So instead of comparing the cross-correlation signals of Fe and Ti planet by planet, we defined a relative metric (details are in the paper if you care) that lets us place them on the same figure. And it's clear: Ti weakens much faster than Fe toward cooler planets. 🔗 arxiv.org/abs/2606.14490 12/n 110
Bibiana Prinoth @bibianaprinoth.ch · 26/06/2026But turns out, we just needed to point the mini-ELT at it, and it popped out super shiny ✨ So with a much larger "telescope", we could still detect titanium! It was depleted compared to equilibrium predictions (and compared to elements like vanadium), but it was definitely there! 7/n 100
Bibiana Prinoth @bibianaprinoth.ch · 14/11/2025When @eso.org announces your dream job but your still too much of a science baby 😭 In case you consider applying, feel free to reach out. Happy to chat about ESO 💙🫶 #astronomy 170
Bibiana Prinoth @bibianaprinoth.ch · 13/05/2025Last Friday, I defended my PhD in Astronomy and Astrophysics 🪐 Still processing… but you can call me Dr. Bibi now. 💅 I am eternally grateful to my supervisors, mentors, and everyone who supported me on this journey. 💜 #astronomy #exoplanets 161988
Bibiana Prinoth @bibianaprinoth.ch · 15/04/2025Nailed it! As per Swedish tradition, I’ve officially nailed my thesis to the wall to announce that I’ll be defending my PhD in #exoplanets atmospheres in 3 weeks and 3 days. Dr title, I’m coming for youuuu! 111477
Bibiana Prinoth @bibianaprinoth.ch · 26/01/2025If #exoplanets and memes are your thing, then this ones for you! ⬇️ The Massive Exoplanet MEME Exhibition kicks off on Monday, and on Friday they‘ll close with a couple of lovely talks! Go give them a follow to stay up-to-date 🪐 Also, this is my favourite one from a couple years back 🤓 0292
Bibiana Prinoth @bibianaprinoth.ch · 17/12/2024Spotted! Last seen in Lund 🇸🇪 (Ignore the dirty windows 👀) 030
Bibiana Prinoth @bibianaprinoth.ch · 24/11/2024My partner 3D-printed Saturn for me 🪐 New necklace unlocked. 3581
Bibiana Prinoth @bibianaprinoth.ch · 15/11/2024How could I forget that I've been here before?? I had the exact same problem for another paper last year 🤣 I just added 'the entire atmosphere' as panel 18. Problem solved. ✨ This plot is from Prinoth+2023. ui.adsabs.harvard.edu/abs/2023A%26... Thanks past me for solving this before 🤣🪐🔭 0231
Bibiana Prinoth @bibianaprinoth.ch · 11/11/2024Join us for this wonderful talk by Óscar! In place of an entrance fee, we encourage viewers to support those affected by the recent DANA in Valencia. Every amount helps 🫰🏼 Spread the word, thank you 💛 🔗 fundaciohortasud.helpbysc.com/afectados-da... 3/3 000
Bibiana Prinoth @bibianaprinoth.ch · 11/11/2024Óscar, one of our post-docs will be talking about the detection of black holes and how we are chasing shadows. The talk will be held on November 18, 17:15 CET in Lundmarksalen at Lund University, but we’re also streaming it on YouTube. 🔗 youtube.com/live/So_4FYL... 2/3 133
Bibiana Prinoth @bibianaprinoth.ch · 11/11/2024I’m sure you’ve all heard about the devastating floods which hit the region of Valencia recently - see before and after by ESA. This is why, together with the astronomy club at Lund University, we are organising an outreach talk under the umbrella “Astronomia per València” 💙🔭 1/3 2215
Bibiana Prinoth @bibianaprinoth.ch · 19/06/2024Wow I am a smarty 🤓 Just gave a two-minute flash talk about my recent paper and COMPLETELY FORGOT TO SAY MY NAME. Well, hope people looked at the slide 🥹 Here‘s the slide. Here‘s the link to the paper: 🔗 ui.adsabs.harvard.edu/abs/2024arXi... #exoplanets5 060
Bibiana Prinoth @bibianaprinoth.ch · 17/06/2024Come find me at my poster! Poster Area G. We got coffee! #exoplanets5 0112
Bibiana Prinoth @bibianaprinoth.ch · 07/06/2024It’s my last day (in person) at the ESO offices in Vitacura today and our student coordinator just sent the cutest email to everyone. Way to make me cry. 010
Bibiana Prinoth @bibianaprinoth.ch · 03/01/2024Me: Lund in Winter is basically constant rain with 2 degrees Celsius. Lund: Watch me! 020
Bibiana Prinoth @bibianaprinoth.ch · 29/11/2023Also learned that the UV index right now is 7 here (source: Apple weather). -> sunburn within 15-25 mins -> USE SUNSCREEN BIBI 000
Bibiana Prinoth @bibianaprinoth.ch · 15/10/2023Doing what my supervisors told me to do: GO AND EXPERIENCE CHILE 🇨🇱 0100
Bibiana Prinoth @bibianaprinoth.ch · 29/08/2023We would like to thank everyone involved in this study, and our special thanks go to our co-author and PI of the programme, Simon Albrecht, for letting us go wild analysing the atmosphere of this planet. It was a lot of fun! 100
Bibiana Prinoth @bibianaprinoth.ch · 29/08/2023Both H and Na are clearly blueshifted with respect to the restframe. Though interestingly, the blueshifts are different! Because H and Na are probing different altitudes of the atmosphere this hints at high-velocity day-to-nightside winds, potentially localised in jet streams. 120
Bibiana Prinoth @bibianaprinoth.ch · 29/08/2023Why is this important? Recently, observations of hotter (but less inflated) planets have not detected Fe. Both in the literature and in our study, it is therefore unclear whether neutral Fe is present in inflated but cooler hot Jupiters. (Observation) time will tell! 🔭 100
Bibiana Prinoth @bibianaprinoth.ch · 29/08/2023Using the cross-correlation technique, we detect H, Na and Fe. We find that we need models with higher temperatures to explain the observed signals, which could be caused by observing hotter regions at the terminator and/or a more extended atmosphere than expected by our models. 100
Bibiana Prinoth @bibianaprinoth.ch · 29/08/2023In this work, we looked at a transit of the bloated hot Jupiter WASP-172 b taken with our favourite spectrograph ESPRESSO on the VLT and studied the composition and dynamics of this wonderful target. Let us tell you what we find! 110
Bibiana Prinoth @bibianaprinoth.ch · 10/08/2023This paper was very difficult. After I published my first paper in Nature Astronomy, I honestly felt that I would not be able to publish something equally "important". IMPOSTER SYNDROME 🚨 I would like to thank everyone who supported me during this time. You know who you are ❤️ 100
Bibiana Prinoth @bibianaprinoth.ch · 10/08/2023CONCLUSION: We can do a lot with eight transits. Instead of stacking and averaging contributions, we can study the absorption in a TIME-RESOLVED manner. Different regions may dominate your signal throughout the transit + you may be able to "see" chemistry happening. 🤓 210
Bibiana Prinoth @bibianaprinoth.ch · 10/08/2023Good question! The short answer: they may ionise (atoms and ions) or dissociate (TiO)! Ba+ ionises to Ba2+! Yes, it does, already at very low temperatures! 🪄🪄 MAGIC ATOMIC PHYSICS 🪄🪄 Check out the paper for more! 100
Bibiana Prinoth @bibianaprinoth.ch · 10/08/2023Comparing the signal strength at the beginning and end of the transit, we find that most of the detected species tend to get stronger. This is what we expect from probing the hotter trailing terminator towards the end of the transit. But what about TiO, Ca+, Ni, Ba+ and H? 100
Bibiana Prinoth @bibianaprinoth.ch · 10/08/2023As tidally-locked planets move through transit, we probe different regions of the atmosphere. At the leading terminator it is colder, while towards the end of the transit, we probe the hotter trailing terminator that is inflated. The signals are dominated by different regions! 100
Bibiana Prinoth @bibianaprinoth.ch · 10/08/2023Can you spot the F_begin and F_end in the corner plot? We fit a line (degree 1 polynomial if you wanna be fancy) to our absorption depth instead of assuming it to be constant. Why? This way we were able to study the change in signal strength over the course of the transit! 100
Bibiana Prinoth @bibianaprinoth.ch · 10/08/2023"If you can see it, you can fit it!" And this is exactly what we did! We fit our orbital traces for ALL detected species using a Bayesian framework using Jax + numpyro (hit me up if you wanna know more or read the paper 🤓) to determine orbital parameters and signal strengths. 110
Bibiana Prinoth @bibianaprinoth.ch · 10/08/2023.. allowing you to do a thing we called TIME-RESOLVED TRANSMISSION SPECTROSCOPY. No need for averaging over the time axis to increase the SNR, because you've already got it! See for yourself, this is our atmospheric trace for iron! - One thing my supervisor keeps telling me: 100
Bibiana Prinoth @bibianaprinoth.ch · 10/08/2023But let me tell you: YOU CAN DO MORE! Raise your hand if you are one of the people struggling with these "orbital vs. systemic velocity" plots 🙋♀️🧐 Well, you don't have to struggle with these anymore. Because combining 8 transits gives you a beautiful signal-to-noise ratio... 100
Bibiana Prinoth @bibianaprinoth.ch · 10/08/2023It probably doesn't come as a surprise to you now that we managed to confirm the detection of titanium oxide (see Prinoth+ 2022) not only by combining all 8 transits but also for the new observations with MAROON-X and ESPRESSO independently. IT IS THERE, BELIEVE ME! 120
Bibiana Prinoth @bibianaprinoth.ch · 10/08/2023What can you do with 8 transits of a planet with a relatively bright host? A LOT! We used the cross-correlation technique to create an inventory of the transmission spectrum. We looked for 90 different species + found these 17: - Ever tried to make a panel with 17 tiles? 😒 100
Bibiana Prinoth @bibianaprinoth.ch · 10/08/2023In this study, we combined eight transit observations of the ultra-hot Jupiter WASP-189 b to study its atmosphere. One of the cool things about this target (and there are many!): You can observe it from the north AND the south! So we used HARPS, HARPS-N, ESPRESSO & MAROON-X 🤯 100
Bibiana Prinoth @bibianaprinoth.ch · 10/08/2023Raise your hand if you've ever played "Love me, love me not" in your life? Our community has been playing this game for a while with the detection of titanium oxide in the atmospheres of ultra-hot Jupiters: detect me, detect me not ... Intriguing? Let's start from the top! 120
Bibiana Prinoth @bibianaprinoth.ch · 08/08/2023Show me your best mirror selfie. Here is one I am proud of! 🔭🔭 2230
Bibiana Prinoth @bibianaprinoth.ch · 01/08/2023Made it to Paris where I have a long overlay. Wanted fries but there is only ”HEALTHY & TASTY” here 🥺🥺 110
Bibiana Prinoth @bibianaprinoth.ch · 01/08/2023Let the adventure begin! ✨ My suitcases and I made it safely to CPH. The two big ones were checked in, I made it through security, had a coffee and am now waiting for boarding the flight to Paris ✈️ 💖 240
Bibiana Prinoth @bibianaprinoth.ch · 30/07/2023Meet Globuli. He’s moving to Chile with me. He’s ready. He’s excited. 050
Bibiana Prinoth @bibianaprinoth.ch · 26/07/2023This whole “moving to Santiago soon” is getting very real. The suitcases I ordered arrived and now I get to pick which ones to bring 👀 000
Bibiana Prinoth @bibianaprinoth.ch · 10/07/2023Currently working from home. Like home sweet home. 040
Bibiana Prinoth @bibianaprinoth.ch · 04/07/2023Hello world! 💙 I just landed here fleeing the bird. My name is Bibi and I am a PhD student in astronomy & astrophysics. I study the atmospheres of hot exoplanets 🔭🪐🔥 I am passionate about outreach, teaching, and scicomm, and I LOVE posting during conferences to keep everyone in the loop. 🤓 172